Bryant DURAPAC PLUS 551B User Manual
installation, start-up and  
service instructions  
551B  
DuraPac Plus Series  
Sizes 090-150  
SINGLE PACKAGE ROOFTOP  
ELECTRIC COOLING UNITS  
71/2 to 121/2 Tons  
Cancels: II 551B-90-6  
II 551B-90-7  
10/15/05  
I. STEP 1 — PROVIDE UNIT SUPPORT  
A. Roof Curb  
CONTENTS  
Assemble and install accessory roof curb in accordance with  
instructions shipped with curb. Install insulation, cant  
strips, roofing felt, and counter flashing as shown. Ductwork  
must be attached to curb. If electric or control power is to be  
routed through the basepan, attach the accessory thru-the-  
bottom service connections to the basepan in accordance  
with the accessory installation instructions. Connections  
must be installed before unit is set on roof curb.  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37  
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1  
II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 1  
III. Step 3 — Install Condensate Drain Line  
and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 2  
V. Step 5 — Make Electrical Connections . . . . . . . . . . 7  
VI. Step 6 — Adjust Factory-Installed Options. . . . . . 11  
VII. Step 7 — Adjust Evaporator-Fan Speed . . . . . . . . 21  
IMPORTANT: The gasketing of the unit to the roof curb is  
critical for a watertight seal. Install gasket supplied with the  
roof curb as shown in Fig. 2. Improperly applied gasket can  
also result in air leaks and poor unit performance.  
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-41  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-45  
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .46-49  
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1  
Curb should be level. This is necessary for unit drain to func-  
tion properly. Unit leveling tolerances are shown in Fig. 3.  
Refer to Accessory Roof Curb Installation Instructions for  
additional information as required.  
B. Slab Mount (Horizontal Units Only)  
Provide a level concrete slab that extends a minimum of 6 in.  
beyond unit cabinet. Install a gravel apron in front of con-  
denser coil air inlet to prevent grass and foliage from  
obstructing airflow.  
SAFETY CONSIDERATIONS  
Installation and servicing of air-conditioning equipment can  
be hazardous due to system pressure and electrical compo-  
nents. Only trained and qualified service personnel should  
install, repair, or service air-conditioning equipment.  
NOTE: Horizontal units may be installed on a roof curb if  
required.  
C. Alternate Unit Support (Curb or Slab Mount)  
Untrained personnel can perform basic maintenance func-  
tions of cleaning coils and filters and replacing filters. All  
other operations should be performed by trained service per-  
sonnel. When working on air-conditioning equipment,  
observe precautions in the literature, tags and labels  
attached to the unit, and other safety precautions that may  
apply.  
A non-combustible sleeper rail can be used in the unit curb  
support area. If sleeper rails cannot be used, support the  
long sides of the unit with a minimum of 3 equally spaced  
4-in. x 4-in. pads on each side.  
II. STEP 2 — FIELD FABRICATE DUCTWORK  
On vertical discharge units, secure all ducts to roof curb and  
building structure. Do not connect ductwork to unit. For hori-  
zontal applications, field-supplied flanges should be attached  
to horizontal discharge openings and all ductwork attached  
to the flanges. Insulate and weatherproof all external duct-  
work, joints, and roof openings with counter flashing and  
mastic in accordance with applicable codes.  
Follow all safety codes. Wear safety glasses and work gloves.  
Use quenching cloth for unbrazing operations. Have fire  
extinguisher available for all brazing operations.  
CAUTION: Ensure voltage listed on unit data plate  
agrees with electrical supply provided for unit.  
Ducts passing through an unconditioned space must be insu-  
lated and covered with a vapor barrier.  
WARNING: Before performing service or mainte-  
nance operations on unit, turn off main power switch  
to unit and install lockout tag. Electrical shock could  
cause personal injury.  
If a plenum return is used on a vertical unit, the return  
should be ducted through the roof deck to comply with appli-  
cable fire codes.  
A minimum clearance to combustibles is not required around  
ductwork on vertical discharge units. On horizontal dis-  
charge units, a minimum clearance of 1 in. is required for the  
first 12 in. of ductwork. Cabinet return-air static pressure (a  
negative condition) should not exceed 0.30 in. wg with  
EconoMi$er IV, or 0.45 in. wg without economizer.  
INSTALLATION  
Unit is shipped in the vertical configuration. To convert to  
horizontal configuration, remove side duct opening covers.  
Using the same screws, install covers on vertical duct open-  
ings with the insulation-side down. Seals around duct  
openings must be tight. See Fig. 1.  
ROOF CURB  
ACCESSORY  
CRRFCURB003A01 1′-2″ [356]  
CRRFCURB004A01 2′-0″ [610]  
“A”  
UNIT SIZE  
CONNECTOR  
PKG. ACCY.  
CRBTMPWR001A01  
CRBTMPWR002A01  
D ALT  
ACCESSORY  
POWER  
B
C
GAS  
POWER  
CONTROL  
DRAIN HOLE  
551B090-150  
3/4″ [19] NPT  
11/4″ [31.7]  
3/4″  
[19] NPT  
2′-87/16″ 1′-1015  
/
″
13/4″  
1/2″  
1/2″  
1/2″  
NOTES:  
[827]  
[583]16  
[44.5]  
[12.7] NPT [12.7] NPT  
CRBTMPWR003A01  
CRBTMPWR004A01  
3/4″ [19] NPT  
[12.7] NPT  
1. Roof curb accessory is shipped disassembled.  
2. Insulated panels: 1-in. thick polyurethane foam,  
13/4 lb density.  
3/4″  
11/4″ [31.7]  
[19] NPT  
3. Dimensions in [ ] are in millimeters.  
4. Roof curb: 16-gage steel.  
5. Attach ductwork to curb (flanges of duct rest on  
curb).  
6. Service clearance 4 ft on each side.  
7.  
Direction of airflow.  
8. Connector packages CRBTMPWR001A01 and  
2A01 are for thru-the-curb gas type. Packages  
CRBTMPWR003A01 and 4A01 are for thru-the-  
bottom type gas connections.  
Fig. 2 — Roof Curb Details  
—3—  
MAXIMUM ALLOWABLE DIFFERENCE  
(in.)  
A-B  
B-C  
A-C  
0.5  
1.0  
1.0  
NOTE: Trap should be deep enough to offset maximum unit static differ-  
ence. A 4-in. trap is recommended.  
Fig. 3 — Unit Leveling Tolerances  
Fig. 5 — Condensate Drain Piping Details  
HORIZONTAL  
DRAIN OUTLET  
DRAIN PLUG  
NOTE: Drain plug is shown in factory-installed position.  
Fig. 4 — Condensate Drain Location  
NOTES:  
OPERATING  
WEIGHT  
1. Place unit on curb as close as possible to the duct end.  
2. Dimension in ( ) is in millimeters.  
A
B
C
551B  
lb  
kg  
in.  
mm  
in.  
mm  
in.  
mm  
3. Hook rigging shackles through holes in base rail, as shown in  
detail “A.” Holes in base rails are centered around the unit center  
of gravity. Use wooden top skid when rigging to prevent rigging  
straps from damaging unit.  
4. Unit weights do not include economizer. See Table 1 for econo-  
mizer weights.  
5. Weights include base unit without the Perfect Humidity™ dehumid-  
ification system. See Table 1 for additional unit operating weights  
with the Perfect Humidity dehumidification system.  
090  
102  
120  
150  
755  
895  
915  
930  
343  
406  
415  
422  
77.42 1967 41.5 1054 42.12 1070  
77.42 1967 41.5 1054 50.12 1273  
77.42 1967 41.5 1054 50.12 1273  
77.42 1967 41.5 1054 50.12 1273  
CAUTION: All panels must be in place when rigging.  
Fig. 6 — Rigging Details  
—4—  
—5—  
Table 1 — Physical Data  
UNIT 551B  
090  
102  
120  
150  
NOMINAL CAPACITY (tons)  
71/2  
81/2  
10  
121/2  
OPERATING WEIGHT (lb)  
Unit  
755  
75  
895  
75  
915  
75  
930  
75  
EconoMi$er IV  
Perfect Humidity™ Dehumidification Package  
Roof Curb  
44  
51  
51  
51  
143  
143  
143  
143  
COMPRESSOR  
Scroll  
Quantity  
2
53  
2
53  
2
50  
2
60  
Oil (oz) (each compressor)  
REFRIGERANT TYPE  
R-22  
Metering Device  
Expansion Device  
Operating Charge (lb-oz)  
Standard Unit  
Circuit 1  
7-10  
8- 2  
9- 8  
8-13  
9-6  
10-9  
9-8  
9-5  
Circuit 2  
Unit With Perfect Humidity Dehumidification Package  
Circuit 1  
Circuit 2  
13-0  
13-6  
16-0  
16-8  
16-8  
17-8  
15-3  
16-6  
CONDENSER FAN  
Quantity...Diameter (in.)  
Nominal Cfm  
Propeller Type  
2...22  
6500  
2...22  
6500  
2...22  
7000  
2...22  
7000  
Motor Hp...Rpm  
1/4...1100  
650  
1/4...1100  
650  
1/4...1100  
650  
1/4...1100  
650  
Watts Input (Total)  
CONDENSER COIL  
Rows...Fins/in.  
Total Face Area (sq ft)  
High-Efficiency Enhanced Copper Tubes, Lanced Aluminum Fins  
2...17  
20.5  
2...17  
25.0  
2...17  
25.0  
2...17  
25.0  
EVAPORATOR COIL  
High Efficiency Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Face Split  
Standard Unit  
Rows...Fins/in.  
3...15  
8.9  
4...15  
11.1  
4...15  
11.1  
4...15  
11.1  
Total Face Area (sq ft)  
Unit with Perfect Humidity Dehumidification Package  
Rows...Fins/in.  
2...17  
6.3  
2...17  
8.4  
2...17  
8.4  
2...17  
8.4  
Total Face Area (sq ft)  
EVAPORATOR FAN  
Size (in.)  
Centrifugal Type, Belt Drive  
15 x 15  
3000  
15 x 15  
3400  
15 x 15  
4000  
15 x 15  
5000  
Nominal Cfm — Standard  
Maximum Continuous Bhp  
Standard  
2.90  
4.20  
56  
2.90  
4.20  
56  
3.70  
5.25  
56  
5.25  
—
56  
High Static  
Motor Frame  
Fan Rpm Range  
Standard  
840-1085  
860-1080  
Ball  
840-1085  
860-1080  
Ball  
860-1080  
830-1130  
Ball  
830-1130  
—
Ball  
2100  
High Static  
Motor Bearing Type  
Maximum Fan Rpm  
Motor Pulley Pitch Diameter A/B (in.)  
Standard  
2100  
2100  
2100  
3.4/4.4  
4.0/5.0  
3.4/4.4  
4.0/5.0  
4.0/5.0  
2.8/3.8  
2.8/3.8  
—
High Static  
7
/
7
/
7
/
7
/
Nominal Motor Shaft Diameter (in.)  
Fan Pulley Pitch Diameter (in.)  
Standard  
8
8
8
8
7.0  
8.0  
7.0  
8.0  
8.0  
5.8  
5.8  
—
High Static  
Belt — Quantity...Type...Length (in.)  
Standard  
1...A...48  
1...A...55  
16.75-19.25  
1...A...51  
1...A...55  
16.75-19.25  
1...A...51  
1...BX...46  
15.85-17.50  
1...BX...46  
—
15.85-17.50  
High Static  
Pulley Center Line Distance (in.)  
Speed Change per Full Turn of  
Movable Pulley Flange (rpm)  
Standard  
50  
60  
50  
60  
45  
60  
60  
—
High Static  
Movable Pulley Maximum Full Turns  
From Closed Position  
Standard  
5
5
5
5
5
5
5
6
5
6
—
5
High Static  
Factory Setting — Full Turns Open  
Factory Speed Setting (rpm)  
Standard  
840  
860  
1
840  
860  
1
862  
887  
1
887  
—
1
High Static  
Fan Shaft Diameter at Pulley (in.)  
HIGH-PRESSURE SWITCH (psig)  
Standard Compressor Internal Relief (Differential)  
450 50  
428  
320  
Cutout  
Reset (Auto.)  
LOSS-OF-CHARGE/LOW-PRESSURE  
SWITCH (Liquid Line) (psig)  
Cutout  
7
22  
3
5
Reset (Auto.)  
FREEZE-PROTECTION THERMOSTAT  
Opens (F)  
Closes (F)  
30  
45  
5
5
OUTDOOR-AIR INLET SCREENS  
RETURN-AIR FILTERS  
Quantity...Size (in.)  
Cleanable. Screen size and quantity varies by options selected.  
Throwaway  
4...16 x 20 x 2  
4...16 x 20 x 2  
4...20 x 20 x 2  
4...20 x 20 x 2  
LEGEND  
Bhp — Brake Horsepower  
—6—  
V. STEP 5 — MAKE ELECTRICAL CONNECTIONS  
When installing units, provide a disconnect per the NEC.  
All field wiring must comply with the NEC and local require-  
ments. In Canada, electrical connections must be made in  
accordance with CSA (Canadian Standards Association)  
C22.1 Canadian Electrical Code Part One.  
WARNING: Unit cabinet must have an uninter-  
rupted, unbroken electrical ground to minimize the  
possibility of personal injury if an electrical fault  
should occur. This ground may consist of electrical wire  
connected to unit ground lug in control compartment,  
or conduit approved for electrical ground when  
installed in accordance with NEC (National Electrical  
Code) ANSI (American National Standards Institute) /  
NFPA (National Fire Protection Association) 70-latest  
year and local electrical codes. Failure to follow this  
warning could result in the installer being liable for  
personal injury of others.  
Install field wiring as follows:  
1. Install conduit through side panel openings. For units  
without electric heat, install conduit between discon-  
nect and control box.  
2. Install power lines to terminal connections as shown  
in Fig. 8.  
3. For units with electric heat, refer to Accessory Instal-  
lation Instructions.  
During operation, voltage to compressor terminals must be  
within range indicated on unit nameplate (see Table 2). On  
3-phase units, voltages between phases must be balanced  
within 2%, and the current within 10%. Use the formula  
shown in Table 2, Note 2 on page 10 to determine the per-  
centage of voltage imbalance. Operation on improper line  
voltage or excessive phase imbalance constitutes abuse and  
may cause damage to electrical components. Such operation  
would invalidate any applicable Bryant warranty.  
A. Field Power Supply  
All units except 208/230-v units are factory-wired for the  
voltage shown on the unit nameplate. If the 208/230-v unit is  
to be connected to a 208-v power supply, the transformer  
must be rewired by disconnecting the black wire from the  
230-v terminal wire on the transformer and connecting it to  
the 200-v red terminal of the transformer. The end of the  
orange wire must then be insulated.  
See Table 3 for electric heater and single point box usage.  
Refer to unit label diagram for additional information.  
Pigtails are provided for field wire connections. Use factory-  
supplied splices or UL (Underwriters’ Laboratories)  
approved copper/aluminum connector.  
551B150, 208/230-3-60  
551B090-120, 208/230-3-60  
551B090-150, 460-3-60  
LEGEND  
C
—
Contactor  
COMP(S) — Compressor  
IFC  
—
—
—
—
Indoor (Evaporator) Fan Contactor  
National Electrical Code  
Outdoor (Condenser) Fan Contactor  
Terminal Block  
NEC  
OFC  
TB  
Terminal Block Connection  
Field Wiring  
Factory Wiring  
Splice Connection  
(Factory-Supplied)  
551B090-150, 575-3-60  
Fig. 8 — Power Wiring Connections  
—7—  
Table 2 — Electrical Data  
VOLTAGE  
RANGE  
ELECTRIC HEATER  
POWER SUPPLY  
DISCONNECT  
SIZE†  
COMP NO. 1 COMP NO. 2  
Fuse  
or  
UNIT  
551B  
NOMINAL  
V-PH-Hz  
IFM  
TYPE  
CONV  
OUTLET  
OFM OFM IFM  
Nominal  
QTY  
FLA FLA  
FLA  
MCA  
MOCP  
Min Max RLA  
LRA  
RLA  
LRA  
kW*  
HACR  
Bkr  
FLA  
LRA  
—
—/—  
38.2/ 38.2  
38.2/ 40.6  
51.1/ 57.5  
74.0/ 84.0  
92.8/105.6  
119.9/136.9  
45/45  
45/45  
60/60  
—
—
—
40/ 40  
40/ 40  
47/ 53  
68/ 77  
85/ 97  
110/126  
242/242  
242/242  
242/242  
242/242  
242/242  
242/242  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
—
STD  
STD  
NO  
YES  
NO  
187  
187  
187  
187  
414  
414  
414  
414  
254  
254  
254  
254  
508  
508  
508  
508  
12.4  
12.4  
12.4  
12.4  
6.4  
88.0 12.4  
88.0 12.4  
88.0 12.4  
88.0 12.4  
88.0  
2
1.4  
1.4  
1.4  
1.4  
0.7  
0.7  
0.7  
0.7  
7.5  
7.5  
80/ 90  
100/110  
125/150  
—
—
—
—/—  
44.2/ 44.2  
44.2/ 45.6  
56.1/ 62.5  
79.0/ 89.0  
97.8/110.6  
124.9/141.9  
50/50  
50/50  
—
—
46/ 46  
46/ 46  
53/ 58  
74/ 83  
91/103  
116/131  
247/247  
247/247  
247/247  
247/247  
247/247  
247/247  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
—
60/ 70  
80/ 90  
100/125  
125/150  
88.0  
88.0  
88.0  
44.0  
44.0  
44.0  
44.0  
2
2
2
2
2
2
2
—
—
—
208/230-3-60  
—
—/—  
41.3/ 41.3  
41.3/ 44.5  
54.9/ 61.4  
77.9/ 87.8  
96.6/109.5  
123.7/140.8  
45/45  
50/50  
—
—
—
60/ 70  
80/ 90  
100/110  
125/150  
44/ 44  
44/ 44  
51/ 56  
72/ 81  
89/101  
114/129  
267/267  
267/267  
267/267  
267/267  
267/267  
267/267  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
HIGH  
STATIC  
10.6  
10.6  
3.4  
—
—
—
—
—/—  
47.3/ 47.3  
47.3/ 49.5  
59.9/ 66.4  
82.9/ 92.8  
101.6/114.5  
128.7/145.8  
50/50  
60/60  
—
—
—
70/ 70  
90/100  
110/125  
150/150  
49/ 49  
49/ 49  
56/ 62  
77/ 86  
94/106  
119/135  
271/271  
271/271  
271/271  
271/271  
271/271  
271/271  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
HIGH  
STATIC  
YES  
NO  
—
—
—
—
—
19.2  
25.1  
29.1  
46.0  
53.9  
66.9  
20  
20  
20  
50  
60  
—
—
—
—
—
—
70  
20  
23  
27  
42  
50  
62  
121  
121  
121  
121  
121  
121  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
STD  
STD  
44.0  
44.0  
44.0  
44.0  
6.4  
6.4  
6.4  
6.4  
090  
—
—
21.9  
28.5  
31.8  
48.7  
56.6  
69.6  
20  
20  
35  
50  
60  
—
—
—
—
—
—
70  
23  
26  
29  
45  
52  
64  
123  
123  
123  
123  
123  
123  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
YES  
NO  
6.4  
3.4  
460-3-60  
—
—
20.6  
26.9  
30.8  
47.8  
55.6  
68.7  
20  
20  
35  
50  
60  
—
—
—
—
—
—
70  
22  
25  
28  
44  
51  
63  
133  
134  
134  
134  
134  
134  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
HIGH  
STATIC  
6.4  
4.8  
—
—
23.3  
30.3  
33.5  
50.5  
58.3  
71.4  
20  
35  
35  
60  
60  
—
—
—
—
—
—
80  
24  
27  
31  
46  
54  
66  
135  
136  
136  
136  
136  
136  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
HIGH  
STATIC  
YES  
6.4  
4.8  
—
—
14.6  
23.8  
44.3  
20  
20  
45  
—
—
—
15  
22  
41  
94  
95  
95  
STD  
STD  
NO  
YES  
NO  
518  
518  
518  
518  
632  
632  
632  
632  
4.8  
4.8  
4.8  
4.8  
34.0  
34.0  
34.0  
34.0  
4.8  
4.8  
4.8  
4.8  
34.0  
34.0  
34.0  
34.0  
2
2
2
2
0.7  
0.7  
0.7  
0.7  
3.4  
3.4  
4.8  
4.8  
17.0  
34.0  
16.4  
32.7  
—
17.0  
34.0  
—
16.4  
32.7  
16.8  
26.5  
44.3  
20  
20  
45  
—
—
—
17  
24  
43  
96  
96  
96  
575-3-60  
—
17.0  
34.0  
—
16.4  
32.7  
15.8  
25.2  
45.7  
20  
20  
50  
—
—
—
17  
23  
42  
104  
104  
104  
HIGH  
STATIC  
—
17.0  
34.0  
—
16.4  
32.7  
17.9  
27.9  
45.7  
20  
20  
50  
—
—
—
19  
25  
44  
106  
106  
106  
HIGH  
STATIC  
YES  
—
—/—  
40.2/ 40.2  
40.2/ 40.6  
51.1/ 57.5  
74.0/ 84.0  
92.8/105.6  
119.9/136.9  
45/45  
45/45  
60/60  
—
—
—
42/ 42  
42/ 42  
47/ 53  
68/ 77  
85/ 97  
110/126  
276/276  
276/276  
276/276  
276/276  
276/276  
276/276  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
—
STD  
STD  
NO  
YES  
NO  
187  
187  
187  
187  
414  
414  
414  
414  
254  
254  
254  
254  
508  
508  
508  
508  
13.4 105.0 13.1 105.0  
13.4 105.0 13.1 105.0  
13.4 105.0 13.1 105.0  
13.4 105.0 13.1 105.0  
2
2
2
2
2
2
2
2
1.4  
1.4  
1.4  
1.4  
0.7  
0.7  
0.7  
0.7  
7.5  
7.5  
80/ 90  
100/110  
110/150  
—
—
—
—/—  
46.2/ 46.2  
46.2/ 46.2  
56.1/ 62.5  
79.0/ 89.0  
97.8/110.6  
124.9/141.9  
50/50  
50/50  
—
—
48/ 48  
48/ 48  
53/ 58  
74/ 83  
91/103  
116/131  
281/281  
281/281  
281/281  
281/281  
281/281  
281/281  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
—
60/ 70  
80/ 90  
100/125  
125/150  
—
—
—
208/230-3-60  
—
—/—  
43.3/ 43.3  
43.3/ 44.5  
54.9/ 61.4  
77.9/ 87.8  
96.6/109.5  
123.7/140.8  
50/50  
50/50  
—
—
—
60/ 70  
80/ 90  
100/110  
125/150  
46/ 46  
46/ 46  
51/ 56  
72/ 81  
89/101  
114/129  
301/301  
301/301  
301/301  
301/301  
301/301  
301/301  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
HIGH  
STATIC  
10.6  
10.6  
3.4  
—
—
—
—
—/—  
49.3/ 49.3  
49.3/ 49.5  
59.9/ 66.4  
82.9/ 92.8  
101.6/114.5  
128.7/145.8  
60/60  
60/60  
—
—
—
70/ 70  
90/100  
110/125  
150/150  
51/ 51  
51/ 51  
56/ 62  
77/ 86  
94/106  
119/135  
305/305  
305/305  
305/305  
305/305  
305/305  
305/305  
7.8/10.4  
12.0/16.0  
18.6/24.8  
24.0/32.0  
31.8/42.4  
21.7/ 25.0  
33.4/ 38.5  
51.7/ 59.7  
66.7/ 77.0  
88.4/102.0  
HIGH  
STATIC  
YES  
NO  
—
—
—
102  
—
—
21.5  
25.1  
29.1  
46.0  
53.9  
66.9  
20  
20  
20  
50  
60  
—
—
—
—
—
—
70  
23  
23  
27  
42  
50  
62  
143  
143  
143  
143  
143  
143  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
STD  
STD  
7.4  
7.4  
7.4  
7.4  
55.0  
55.0  
55.0  
55.0  
7.4  
7.4  
7.4  
7.4  
55.0  
55.0  
55.0  
55.0  
—
—
24.2  
28.5  
31.8  
48.7  
56.6  
69.6  
20  
20  
35  
50  
60  
—
—
—
—
—
—
70  
25  
26  
29  
45  
52  
64  
145  
145  
145  
145  
145  
145  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
YES  
NO  
3.4  
460-3-60  
—
—
22.9  
26.9  
30.8  
47.8  
55.6  
68.7  
20  
20  
35  
50  
60  
—
—
—
—
—
—
70  
24  
25  
28  
44  
51  
63  
155  
156  
156  
156  
156  
156  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
HIGH  
STATIC  
4.8  
—
—
25.6  
30.3  
33.5  
50.5  
58.3  
71.4  
20  
35  
35  
60  
60  
—
—
—
—
—
—
80  
27  
27  
31  
46  
54  
66  
157  
158  
158  
158  
158  
158  
13.9  
16.5  
27.8  
33.0  
41.7  
16.7  
19.8  
33.4  
39.7  
50.2  
HIGH  
STATIC  
YES  
4.8  
See page 10 for legend and notes.  
—8—  
Table 2 — Electrical Data (cont)  
VOLTAGE  
RANGE  
ELECTRIC HEATER  
POWER SUPPLY  
DISCONNECT  
SIZE†  
COMP NO. 1 COMP NO. 2  
Fuse  
or  
UNIT  
551B  
NOMINAL  
V-PH-Hz  
IFM  
TYPE  
CONV  
OUTLET  
OFM OFM IFM  
Nominal  
kW*  
QTY  
FLA FLA  
FLA  
MCA  
MOCP  
Min  
Max RLA  
LRA  
RLA  
LRA  
HACR  
Bkr  
FLA  
LRA  
—
—
18.2  
23.8  
44.3  
20  
20  
45  
—
—
—
19  
22  
41  
114  
115  
115  
STD  
STD  
NO  
YES  
NO  
518  
632  
632  
632  
632  
6.4  
6.4  
6.4  
6.4  
44.0  
6.4  
44.0  
2
2
2
2
0.7  
0.7  
0.7  
0.7  
3.4  
3.4  
3.4  
4.8  
17.0  
34.0  
16.4  
32.7  
—
17.0  
34.0  
—
16.4  
32.7  
20.4  
26.5  
46.9  
25  
25  
50  
—
—
—
21  
24  
43  
116  
116  
116  
518  
518  
518  
44.0  
44.0  
44.0  
6.4  
6.4  
6.4  
44.0  
44.0  
44.0  
102  
(cont)  
575-3-60  
—
17.0  
34.0  
—
16.4  
32.7  
18.2  
23.8  
44.3  
20  
20  
45  
—
—
—
19  
22  
41  
114  
115  
115  
HIGH  
STATIC  
—
17.0  
34.0  
—
16.4  
32.7  
21.5  
27.9  
48.3  
25  
25  
50  
—
—
—
22  
25  
44  
126  
126  
126  
HIGH  
STATIC  
YES  
—
—/—  
53.0/ 53.0  
53.0/ 53.0  
54.9/ 61.4  
96.6/109.5  
123.7/140.8  
143.5/133.5  
60/60  
60/60  
—
—
56/ 56  
56/ 56  
56/ 56  
89/101  
114/129  
132/151  
341/341  
341/341  
341/341  
341/341  
341/341  
341/341  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
—
60/ 70  
100/110  
125/150  
150/150  
STD  
STD  
NO  
YES  
NO  
187  
187  
187  
187  
414  
414  
414  
414  
254  
254  
254  
254  
508  
508  
508  
508  
17.6 125.0 17.6 125.0  
17.6 125.0 17.6 125.0  
17.6 125.0 17.6 125.0  
17.6 125.0 17.6 125.0  
2
2
2
2
2
2
2
2
1.4  
1.4  
1.4  
1.4  
0.7  
0.7  
0.7  
0.7  
10.6  
10.6  
15.0  
15.0  
4.8  
—
—
—
—
—/—  
59.0/ 59.0  
59.0/ 59.0  
59.9/ 66.4  
101.6/114.5  
128.7/145.8  
148.5/137.5  
70/70  
—
—
61/ 61  
61/ 61  
61/ 62  
94/106  
119/135  
138/156  
345/345  
345/345  
345/345  
345/345  
345/345  
345/345  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
70/ 70  
70/ 70  
110/125  
150/150  
150/150  
—
—
—
—
208/230-3-60  
—
—/—  
57.4/ 57.4  
57.4/ 57.4  
60.4/ 66.9  
102.1/115.0  
129.2/146.3  
149.0/139.0  
70/70  
—
—
61/ 61  
61/ 61  
61/ 62  
94/106  
119/135  
137/156  
364/364  
364/364  
364/364  
364/364  
364/364  
364/364  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
70/ 70  
70/ 80  
110/125  
150/150  
150/175  
HIGH  
STATIC  
—
—
—
—
—
—/—  
63.4/ 63.4  
63.4/ 63.4  
65.4/ 71.9  
107.1/120.0  
134.2/151.3  
154.0/143.0  
70/70  
—
—
66/ 66  
66/ 66  
66/ 67  
99/111  
124/140  
143/161  
369/369  
369/369  
369/369  
369/369  
369/369  
369/369  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
70/ 70  
80/ 80  
110/125  
150/175  
175/175  
HIGH  
STATIC  
—
YES  
NO  
—
—
—
—
—
24.9  
26.9  
30.8  
55.6  
68.7  
66.1  
20  
20  
35  
60  
—
—
—
—
—
—
70  
80  
26  
26  
28  
51  
63  
75  
170  
171  
171  
171  
171  
171  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
STD  
STD  
8.3  
8.3  
8.3  
8.3  
62.5  
62.5  
62.5  
62.5  
8.3  
8.3  
8.3  
8.3  
62.5  
62.5  
62.5  
62.5  
—
—
27.6  
30.3  
33.5  
58.3  
71.4  
70.1  
20  
35  
35  
60  
—
—
—
—
—
—
80  
80  
29  
29  
31  
54  
66  
77  
172  
173  
173  
173  
173  
173  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
120  
YES  
NO  
4.8  
460-3-60  
—
—
27.5  
30.1  
34.1  
58.9  
71.9  
69.4  
20  
35  
40  
60  
—
—
—
—
—
—
80  
80  
29  
29  
31  
54  
66  
78  
182  
182  
182  
182  
182  
182  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
HIGH  
STATIC  
7.4  
—
—
30.2  
33.5  
36.8  
61.6  
74.6  
73.4  
35  
40  
40  
—
—
—
—
—
—
70  
80  
80  
32  
32  
34  
57  
69  
80  
184  
184  
184  
184  
184  
184  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
HIGH  
STATIC  
YES  
7.4  
—
—
19.1  
25.2  
45.7  
53.9  
25  
25  
50  
60  
—
—
—
—
20  
23  
42  
61  
136  
136  
136  
136  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
STD  
STD  
NO  
YES  
NO  
518  
518  
518  
518  
632  
632  
632  
632  
6.3  
6.3  
6.3  
6.3  
50.0  
50.0  
50.0  
50.0  
6.3  
6.3  
6.3  
6.3  
50.0  
50.0  
50.0  
50.0  
2
2
2
2
0.7  
0.7  
0.7  
0.7  
4.8  
4.8  
7.4  
7.4  
—
—
21.3  
27.9  
48.3  
56.5  
25  
25  
50  
60  
—
—
—
—
22  
25  
44  
63  
138  
138  
138  
138  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
575-3-60  
—
—
21.2  
27.8  
48.3  
56.5  
25  
25  
50  
—
—
—
—
70  
23  
26  
44  
63  
145  
146  
146  
146  
HIGH  
STATIC  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
—
—
23.4  
30.5  
50.9  
59.1  
25  
35  
60  
—
—
—
—
70  
25  
28  
46  
65  
147  
148  
148  
148  
HIGH  
STATIC  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
YES  
—
—/—  
60.6/ 60.6  
60.6/ 60.6  
60.4/ 66.9  
102.1/115.0  
129.2/146.3  
149.0/139.0  
70/70  
—
—
64/ 64  
64/ 64  
64/ 64  
94/106  
119/135  
137/156  
426/426  
426/426  
426/426  
426/426  
426/426  
426/426  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
70/ 70  
70/ 80  
110/125  
150/150  
150/175  
—
STD  
STD  
STD  
STD  
NO  
YES  
NO  
187  
187  
414  
414  
254  
254  
508  
508  
19.0 156.0 19.0 156.0  
19.0 156.0 19.0 156.0  
2
2
2
2
1.4  
1.4  
0.7  
0.7  
15.0  
15.0  
7.4  
—
—
—
208/230-3-60  
—
—/—  
66.6/ 66.6  
66.6/ 66.6  
65.4/ 71.9  
107.1/120.0  
134.2/151.3  
154.0/143.0  
70/70  
—
—
70/ 70  
70/ 70  
70/ 70  
99/111  
124/140  
143/161  
431/431  
431/431  
431/431  
431/431  
431/431  
431/431  
7.8/10.4  
12.0/16.0  
24.0/32.0  
31.8/42.4  
37.5/50.0  
21.7/ 25.0  
33.4/ 38.5  
66.7/ 77.0  
88.4/102.0  
104.2/120.3  
70/ 70  
80/ 80  
110/125  
150/175  
175/175  
—
—
—
—
—
—
29.1  
30.1  
34.1  
58.9  
71.9  
69.4  
35  
35  
40  
60  
—
—
—
—
—
—
80  
80  
31  
31  
31  
54  
66  
78  
197  
197  
197  
197  
197  
197  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
9.0  
9.0  
70.0  
70.0  
9.0  
9.0  
70.0  
70.0  
150  
460-3-60  
—
—
31.8  
33.5  
36.8  
61.6  
74.6  
73.4  
35  
40  
40  
—
—
—
—
—
—
70  
80  
80  
33  
33  
34  
57  
69  
80  
199  
199  
199  
199  
199  
199  
13.9  
16.5  
33.0  
41.7  
50.0  
16.7  
19.8  
39.7  
50.2  
60.1  
YES  
7.4  
—
—
23.7  
27.8  
48.3  
56.5  
30  
30  
50  
—
—
—
—
70  
25  
26  
44  
63  
153  
154  
154  
154  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
STD  
STD  
NO  
518  
518  
632  
632  
7.4  
7.4  
54.0  
54.0  
7.4  
7.4  
54.0  
54.0  
2
2
0.7  
0.7  
7.4  
7.4  
575-3-60  
—
—
25.9  
30.5  
50.9  
59.1  
30  
35  
60  
—
—
—
—
70  
27  
28  
46  
65  
155  
155  
155  
155  
17.0  
34.0  
51.0  
16.4  
32.7  
49.1  
YES  
See page 10 for legend and notes.  
—9—  
LEGEND AND NOTES FOR TABLE 2  
LEGEND  
Example: Supply voltage is 460-3-60.  
FLA — Full Load Amps  
AB = 452 v  
BC = 464 v  
AC = 455 v  
HACR — Heating, Air Conditioning and Refrigeration  
IFM — Indoor (Evaporator) Fan Motor  
LRA — Locked Rotor Amps  
MCA — Minimum Circuit Amps  
452 + 464 + 455  
3
Average Voltage =  
MOCP— Maximum Overcurrent Protection  
NEC — National Electrical Code  
OFM — Outdoor (Condenser) Fan Motor  
RLA — Rated Load Amps  
1371  
3
=
=
*Heater capacity (kW) is based on heater voltage of 208, 240, 480, and 575-V. If power  
distribution voltage varies from rated heater voltage, heater kW will vary accordingly.  
†Used to determine minimum disconnect per NEC.  
457  
Determine maximum deviation from average voltage.  
(AB) 457 – 452 = 5 v  
(BC) 464 – 457 = 7 v  
NOTES:  
(AC) 457 – 455 = 2 v  
1. In compliance with NEC requirements for multimotor and combination load equip-  
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the  
unit shall be fuse or HACR breaker.  
Maximum deviation is 7 v.  
Determine percent of voltage imbalance.  
2. Unbalanced 3-Phase Supply Voltage  
7
% Voltage Imbalance = 100 x  
457  
Never operate a motor where a phase imbalance in supply voltage is greater than  
2%. Use the following formula to determine the percent of voltage imbalance.  
% Voltage Imbalance  
= 1.53%  
max voltage deviation from average voltage  
This amount of phase imbalance is satisfactory as it is below the maximum allow-  
able 2%.  
= 100 x  
average voltage  
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your  
local electric utility company immediately.  
3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratings  
exceed 80 amps.  
Table 3 — Electric Heater Usage  
ACCESSORY HEATER  
PART NUMBER  
CRHEATER---A00  
ACCESSORY SINGLE POINT BOX  
PART NUMBER  
UNIT  
551B  
VOLTAGE  
(60 Hz)  
ACCESORY  
kW  
CRSINGLE---A00  
7.8/ 9.6/10.4  
12.0/14.7/16.0  
18.6/22.8/24.8  
24.0/29.4/32.0  
31.8/39.0/42.4  
017  
010  
006  
006  
007  
007  
009  
208/230/240  
(3 phase)  
011  
012  
012+017  
12.8/13.9  
15.2/16.5  
25.6/27.8  
30.4/33.0  
38.4/41.7  
016  
013  
006  
006  
006  
006  
008  
090  
460/480  
(3 phase)  
014  
015  
014+016  
575  
(3 phase)  
17.0  
34.0  
018  
019  
006  
006  
7.8/ 9.6/10.4  
12.0/14.7/16.0  
18.6/22.8/24.8  
24.0/29.4/32.0  
31.8/39.0/42.4  
017  
010  
011  
011  
012  
012  
015  
208/230/240  
(3 phase)  
011  
012  
012+017  
12.8/13.9  
15.2/16.5  
25.6/27.8  
30.4/33.0  
38.4/41.7  
016  
013  
011  
011  
011  
011  
014  
102  
460/480  
(3 phase)  
014  
015  
014+016  
575  
(3 phase)  
17.0  
34.0  
018  
019  
011  
011  
7.8/ 9.6/10.4  
12.0/14.7/16.0  
24.0/29.4/32.0  
31.8/38.9/42.4  
37.5/46.0/50.0  
017  
010  
011  
012  
012  
015  
015  
208/230/240  
(3 phase)  
012  
012+017  
010+012  
12.8/13.9  
15.2/16.5  
30.4/33.0  
38.4/41.7  
46.0/50.0  
016  
013  
011  
011  
011  
014  
014  
120  
460/480  
(3 phase)  
015  
014+016  
013+015  
17.0  
34.0  
51.0  
018  
019  
018+019  
011  
011  
014  
575  
(3 phase)  
7.8/ 9.6/10.4  
12.0/14.7/16.0  
24.0/29.4/32.0  
31.8/38.9/42.4  
37.5/46.0/50.0  
017  
010  
012  
012  
012  
015  
015  
208/230/240  
(3 phase)  
012  
012+017  
010+012  
12.8/13.9  
15.2/16.5  
30.4/33.0  
38.4/41.7  
46.0/50.0  
016  
013  
011  
011  
011  
014  
014  
150  
460/480  
(3 phase)  
015  
014+016  
013+015  
17.0  
34.0  
51.0  
018  
019  
018+019  
011  
014  
014  
575  
(3 phase)  
NOTES:  
1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW vary accordingly.  
2. To determine heater kW at voltages other than those shown in table, use the following formula:  
Heater kW new = Heater kW rated x (unit power distribution voltage / rated heater voltage) 2  
As an example:  
For a 16 kW heater rated at 240 v with a power distribution voltage of 215 v  
kW new = 16 kW (215/240) 2  
kW new = 12.8 kW (rating at 215 v)  
—10—  
B. Field Control Wiring  
UL required clearance between the high-voltage and  
low-voltage wiring.  
Install a Bryant-approved accessory thermostat assembly  
according to installation instructions included with the  
accessory. Locate thermostat assembly on a solid wall in the  
conditioned space to sense average temperature in accor-  
dance with thermostat installation instructions.  
5. Connect thermostat wires to screw terminals of low-  
voltage connector (see Fig. 9).  
NOTE: If thru-the-bottom power connections are used refer  
to the accessory installation instructions for information on  
power wiring. Refer to Fig. 7 for drilling holes in basepan.  
Route thermostat cable or equivalent single leads of colored  
wire from subbase terminals to low-voltage connections on  
unit (shown in Fig. 9) as described in Steps 1 through 4 below.  
C. Heat Anticipator Settings  
For units with electric heat, set heat anticipator settings as  
shown in Table 4.  
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American  
Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft,  
use no. 16 AWG insulated wire (35 C minimum). For over  
75 ft, use no. 14 AWG insulated wire (35 C minimum). All  
wire larger than no. 18 AWG cannot be directly connected to  
the thermostat and will require a junction box and splice at  
the thermostat.  
VI. STEP 6 — ADJUST FACTORY-INSTALLED OPTIONS  
A. Disconnect Switch  
The optional disconnect switch is non-fused. The switch has  
the capability of being locked in place for safety purposes.  
B. Perfect Humidity™ Dehumidification System  
1. If mounted on a roof curb and electrical power is to be  
run through the basepan, an accessory thru-the-  
bottom connection kit is required. This is available  
through the local Bryant distributor. This kit is  
required to ensure a reliable water-tight connection.  
Perfect Humidity system operation can be controlled by field  
installation of a Bryant-approved humidistat (Fig. 11), or  
light commercial Thermidistat™ device (Fig. 12). To install  
the humidistat:  
1. Route humidistat cable through hole provided in unit  
corner post.  
2. If unit is mounted on roof curb and accessory thru-  
the-bottom service connections are used, route wire  
through connections.  
2. Feed wires through the raceway built into the corner  
post to the 24-v barrier located on the left side of the  
control box. See Fig. 10. The raceway provides the  
UL-required clearance between high-voltage and low-  
voltage wiring.  
3. Pass control wires through the hole provided on unit  
(see connection D in Connection Sizes table in Fig. 7).  
4. Feed wire through the raceway built into the corner  
post to the 24-v barrier located on the left side of the  
control box. See Fig. 9. The raceway provides the  
CONNECTION  
BOARD  
R
G
COOL STAGE 1  
FAN  
Y1/W2  
G
FACTORY-  
INSTALLED  
DISCONNECT  
(OPTION)  
WIRE  
Y1  
HEAT STAGE 1  
COOL STAGE 2  
HEAT STAGE 2  
24 VAC HOT  
W/W1  
Y/Y2  
O/W2  
R
CONNECTIONS  
TO  
Y2  
LOW-VOLTAGE  
SECTION  
(CONNECTION  
BOARD)  
W1  
W2  
C
RACEWAY  
COMPRESSOR  
NO. 2  
24 VAC COM  
N/A  
C
COMPRESSOR  
NO. 1  
IPD/X  
OUTDOOR AIR  
SENSOR  
S1  
S2  
CONVENIENCE  
OUTLET  
(OPTION)  
THERMOSTAT DIPSWITCH SETTINGS  
ON  
OFF  
HOLE IN  
END  
PANEL  
D
A
B
C
LEGEND  
Field Wiring  
NOTE: Underlined letter indicates active thermostat output when configured  
for A/C operation.  
Fig. 9 — Low-Voltage Connections  
Fig. 10 — Field Control Wiring Raceway  
Table 4 — Heat Anticipator Settings  
UNIT VOLTAGE  
460  
208/230  
Configuration  
2-Stage  
575  
Configuration  
2-Stage  
UNIT  
551B  
Configuration  
2-Stage  
Stage 1  
Heater  
kW*  
Heater  
kW  
Heater  
kW  
1-Stage  
1-Stage  
1-Stage  
Stage 1  
NA  
Stage 2  
NA  
Stage 2  
Stage 1  
Stage 2  
10.4, 16.0  
24.8, 32.0  
42.4, 50.0  
0.3  
0.6  
0.9  
13.9, 16.5  
27.8, 33.0  
41.7, 50.0  
0.3  
0.6  
NA  
NA  
17.0, 34.0  
51.0  
0.3  
0.6  
NA  
NA  
0.3  
0.3  
0.3  
0.6  
0.3  
0.3  
0.3  
0.3  
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. If power distribution voltage to unit varies from rated heater voltage,  
heater kW will vary accordingly.  
—11—  
3. Use a wire nut to connect humidistat cable into low-  
voltage wiring as shown in Fig. 13.  
3. A field-supplied relay must be installed between the  
Thermidistat device and the Perfect Humidity™ cir-  
cuit (recommended relay: HN612KK324) Fig. 14. The  
relay coil is connected between the DEHUM output  
and C (common) of the unit. The relay controls the  
Perfect Humidity solenoid valve and must be wired  
between the Perfect Humidity fuse and the low-  
pressure switch. Refer to the installation instructions  
included with the Bryant Light Commercial Thermi-  
distat device for more information.  
To install Thermidistat™ device:  
1. Route Thermidistat cable through hole provided in  
unit corner post.  
2. Feed the wires through the raceway built into the cor-  
ner post to the 24-v barrier located on the left side of  
the control box. See Fig. 10. The raceway provides the  
UL-required clearance between high and low voltage  
wiring.  
% RELATIVE HUMIDITY  
Fig. 12 — Light Commercial Thermidistat Device  
Fig. 11 — Accessory Field-Installed Humidistat  
LEGEND  
CB  
—
—
—
—
—
—
—
—
—
—
Circuit Breaker  
TRAN — Transformer  
CR  
Cooling Relay  
Field Splice  
DHR  
DSV  
HR  
Dehumidify Relay  
Discharge Solenoid Valve  
Heater Relay  
Terminal (Unmarked)  
HU  
Humidistat  
Splice  
LPS  
LSV  
LTLO  
TB  
Low Pressure Switch  
Liquid Solenoid Valve  
Low Temperature Lockout  
Terminal Block  
Factory Wiring  
Field Control Wiring  
Fig. 13 — Typical Perfect Humidity Dehumidification System Humidistat Wiring (208/230-v Unit Shown)  
LCT  
ROOF TOP UNIT  
R
C
R
C
Y1  
Y2  
G
Y1  
Y2  
G
W1  
W2  
W1  
W2  
CB  
R1  
R1  
DEHUM  
OC  
3.2 AMPS  
PINK  
RED  
24V  
T STAT WIRES  
LEGEND  
LTLO  
PINK  
PINK  
FROM  
PERFECT HUMIDITY  
SYSTEM LLSV  
CB  
—
—
—
—
Circuit Breaker  
LCT  
LLSV  
LTLO  
Light Commercial Thermidistat Device  
Liquid Line Solenoid Valve  
Low Temperature Lockout  
PERFECT HUMIDITY SYSTEM  
Fig. 14 — Typical Rooftop Unit with Perfect Humidity Dehumidification System with Thermidistat Device  
—12—  
C. Convenience Outlet  
1. To remove the existing unit filter access panel, raise  
the panel and swing the bottom outward. The panel is  
now disengaged from the track and can be removed.  
See Fig. 20.  
An optional convenience outlet provides power for rooftop  
use. For maintenance personnel safety, the convenience out-  
let power is off when the unit disconnect is off. Adjacent unit  
outlets may be used for service tools. An optional “Hot Out-  
let” is available from the factory as a special order item.  
D. Manual Outdoor-Air Damper  
The outdoor-air hood and screen are attached to the basepan  
at the bottom of the unit for shipping.  
Assembly:  
1. Determine quantity of ventilation required for build-  
ing. Record amount for use in Step 8.  
2. Remove filter access panel by raising panel and  
swinging panel outward. Panel is now disengaged  
from track and can be removed. No tools are required  
to remove the filter access panel. Remove outdoor-air  
opening panel. Save panels and screws. See Fig. 15.  
3. Separate hood and screen from basepan by removing  
the screws and brackets securing them. Save all  
screws and discard brackets.  
4. Replace outdoor air opening panel.  
5. Place hood on front of outdoor air opening panel. See  
Fig. 16 for hood details. Secure top of hood with the  
6 screws removed in Step 3. See Fig. 17.  
6. Remove and save 8 screws (4 on each side) from sides  
of the manual outdoor-air damper.  
Fig. 16 — Outdoor-Air Hood Details  
7. Align screw holes on hood with screw holes on side of  
manual outdoor-air damper. See Fig. 16 and 17.  
Secure hood with 8 screws from Step 6.  
SCREW  
HOLES  
(TOP)  
8. Adjust minimum position setting of the damper blade  
by adjusting the manual outdoor-air adjustment  
screws on the front of the damper blade. See Fig. 15.  
Slide blade vertically until it is in the appropriate  
position determined by Fig. 18. Tighten screws.  
9. Remove and save screws currently on sides of hood.  
Insert screen. Secure screen to hood using the screws.  
See Fig. 17.  
HOOD  
HOOD  
SCREEN  
LOCATION  
(SCREEN  
NOT  
10. Replace filter access panel. Ensure filter access panel  
slides along the tracks and is securely engaged.  
SHOWN)  
E. Optional EconoMi$er IV  
See Fig. 19 for EconoMi$er IV component locations.  
NOTE: These instructions are for installing the optional  
EconoMi$er IV. Refer to the accessory EconoMi$er IV installa-  
tion instructions when field installing an EconoMi$er IV  
accessory.  
Fig. 17 — Optional Manual Outdoor-Air  
Damper with Hood Attached  
FILTER  
ACCESS  
PANEL  
OUTDOOR AIR  
OPENING  
PANEL  
SCREWS  
(SIDE)  
MANUAL  
OUTDOOR-AIR  
ADJUSTMENT  
SCREWS  
DAMPER  
BLADE  
Fig. 15 — Damper Panel with Manual  
Outdoor-Air Damper Installed  
Fig. 18 — Outdoor Air Damper Position Setting  
—13—  
2. The box with the economizer hood components is  
shipped in the compartment behind the economizer.  
The EconoMi$er IV controller is mounted on top of  
the EconoMi$er IV in the position shown in Fig. 19.  
To remove the component box from its shipping posi-  
tion, remove the screw holding the hood box bracket  
to the top of the economizer. Slide the hood box out of  
the unit. See Fig. 21.  
position past the open filter clips. Close the filter clips  
to lock the filter into place. See Fig. 24.  
8. Caulk the ends of the joint between the unit top panel  
and the hood top. See Fig. 22.  
9. Replace the filter access panel.  
10. Install all EconoMi$er IV accessories. EconoMi$er IV  
wiring is shown in Fig. 25.  
Barometric flow capacity is shown in Fig. 26. Outdoor air  
leakage is shown in Fig. 27. Return air pressure drop is  
shown in Fig. 28.  
IMPORTANT: If the power exhaust accessory is to be  
installed on the unit, the hood shipped with the unit will not  
be used and must be discarded. Sa ve th e a lu m in u m filter  
for u se in th e p ow er exh a u st h ood a ssem b ly.  
F. EconoMi$er IV Standard Sensors  
Outdoor Air Temperature (OAT) Sensor  
3. The indoor coil access panel will be used as the top of  
the hood. Remove the screws along the sides and bot-  
tom of the indoor coil access panel. See Fig. 22.  
The outdoor air temperature sensor (HH57AC074) is a 10 to  
20 mA device used to measure the outdoor-air temperature.  
The outdoor-air temperature is used to determine when the  
EconoMi$er IV can be used for free cooling. The sensor is  
factory-installed on the EconoMi$er IV in the outdoor air-  
stream. See Fig. 19. The operating range of temperature  
measurement is 40 to 100 F.  
4. Swing out indoor coil access panel and insert the  
hood sides under the panel (hood top). Use the screws  
provided to attach the hood sides to the hood top. Use  
screws provided to attach the hood sides to the unit.  
See Fig. 23.  
Supply Air Temperature (SAT) Sensor  
5. Remove the shipping tape holding the economizer  
barometric relief damper in place.  
The supply air temperature sensor is a 3 K thermistor  
located at the inlet of the indoor fan. See Fig. 29. This sensor  
is factory installed. The operating range of temperature  
measurement is 0° to 158 F. See Table 5 for sensor tempera-  
ture/resistance values.  
6. Insert the hood divider between the hood sides. See  
Fig. 23 and 24. Secure hood divider with 2 screws on  
each hood side. The hood divider is also used as the  
bottom filter rack for the aluminum filter.  
7. Open the filter clips which are located underneath  
the hood top. Insert the aluminum filter into the bot-  
tom filter rack (hood divider). Push the filter into  
ECONOMI$ER IV  
CONTROLLER  
HOOD BOX  
BRACKET  
OUTSIDE AIR  
WIRING  
TEMPERATURE SENSOR  
HARNESS  
LOW AMBIENT  
SENSOR  
ACTUATOR  
Fig. 21 — Hood Box Removal  
Fig. 19 — EconoMi$er IV Component Locations  
FILTER ACCESS PANEL  
SIDE  
PANEL  
TOP  
SIDE  
PANEL  
CAULK  
HERE  
INDOOR  
COIL  
ACCESS  
PANEL  
INDOOR  
COIL  
ACCESS  
PANEL  
INDOOR COIL ACCESS PANEL  
Fig. 20 — Typical Access Panel Locations  
Fig. 22 — Indoor Coil Access Panel Relocation  
—14—  
22 1/4”  
TOP  
PANEL  
INDOOR COIL  
ACCESS PANEL  
DIVIDER  
LEFT  
HOOD  
SIDE  
SCREW  
OUTSIDE  
AIR  
B
24 9/16”  
HOOD  
CLEANABLE  
ALUMINUM  
FILTER  
40 3/8”  
FILTER  
HOOD DIVIDER  
BAROMETRIC  
RELIEF  
Fig. 23 — Outdoor-Air Hood Construction  
FILTER  
CLIP  
Fig. 24 — Filter Installation  
FOR OCCUPANCY CONTROL  
REPLACE JUMPER WITH  
FIELD-SUPPLIED TIME CLOCK  
LEGEND  
Potentiometer Defaults Settings:  
Power Exhaust Middle  
NOTES:  
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential  
enthalpy or dry bulb.  
DCV— Demand Controlled Ventilation  
IAQ — Indoor Air Quality  
Minimum Pos.  
DCV Max.  
DCV Set  
Fully Closed  
Middle  
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power  
supply, it cannot have the secondary of the transformer grounded.  
3. For field-installed remote minimum position POT, remove black wire jumper  
between P and P1 and set control minimum position POT. to the minimum  
position.  
LA — Low Ambient Lockout Device  
OAT — Outdoor-Air Temperature  
POT— Potentiometer  
Middle  
Enthalpy  
C Setting  
RAT — Return-Air Temperature  
Fig. 25 — EconoMi$er IV Wiring  
—15—  
Table 5 — Supply Air Sensor Temperature/Resistance  
Values  
2500  
2000  
1500  
1000  
500  
TEMPERATURE (F)  
RESISTANCE (ohms)  
–58  
–40  
–22  
–4  
14  
32  
50  
68  
77  
86  
104  
122  
140  
158  
176  
185  
194  
212  
230  
248  
257  
266  
284  
302  
200,250  
100,680  
53,010  
29,091  
16,590  
9,795  
5,970  
3,747  
3,000  
2,416  
1,597  
1,080  
746  
0
0.15  
0.05  
0.25  
STATIC PRESSURE (in. wg)  
Fig. 26 — Barometric Relief Flow Capacity  
525  
376  
321  
274  
203  
153  
116  
102  
30  
25  
20  
15  
10  
5
89  
70  
55  
0
0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50  
The temperature sensor looks like an eyelet terminal with  
wires running to it. The sensor is located in the “crimp end”  
and is sealed from moisture.  
STATIC PRESSURE (in. wg)  
Fig. 27 — Outdoor Air Damper Leakage  
Outdoor Air Lockout Sensor  
The Economi$er IV is equipped with an ambient tempera-  
ture lockout switch located in the outdoor airstream which is  
used to lock out the compressors below a 42 F ambient tem-  
perature. See Fig. 19.  
6000  
5000  
4000  
3000  
2000  
1000  
0
G. EconoMi$er IV Control Modes  
Determine the EconoMi$er IV control mode before set up of the  
control. Some modes of operation may require different sensors.  
Refer to Table 6. The EconoMi$er IV is supplied from the fac-  
tory with a supply air temperature sensor and an outdoor air  
temperature sensor. This allows for operation of the  
EconoMi$er IV with outdoor air dry bulb changeover control.  
Additional accessories can be added to allow for different  
types of changeover control and operation of the EconoMi$er  
IV and unit.  
0.05  
0.10  
0.15  
0.20  
0.25  
0.30  
0.35  
STATIC PRESSURE (in. wg)  
Fig. 28 — Return Air Pressure Drop  
Table 6 — EconoMi$er IV Sensor Usage  
ECONOMI$ER IV WITH OUTDOOR AIR  
DRY BULB SENSOR  
Accessories Required  
APPLICATION  
None. The outdoor air dry bulb sensor  
is factory installed.  
Outdoor Air Dry Bulb  
Differential Dry Bulb  
Single Enthalpy  
CRTEMPSN002A00*  
HH57AC078  
HH57AC078  
and  
CRENTDIF004A00*  
Differential Enthalpy  
SUPPLY AIR  
TEMPERATURE  
SENSOR  
MOUNTING  
LOCATION  
CO2 for DCV Control  
using a Wall-Mounted  
CO2 Sensor  
CO2 for DCV Control  
using a Duct-Mounted  
CO2 Sensor  
33ZCSENCO2  
33ZCSENCO2†  
and  
CRCBDIOX005A00††  
33ZCASPCO2**  
SUPPLY AIR  
TEMPERATURE  
SENSOR  
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on  
many different base units. As such, these kits may contain parts that will  
not be needed for installation.  
†33ZCSENCO2 is an accessory CO2 sensor.  
**33ZCASPCO2 is an accessory aspirator box required for duct-mounted  
applications.  
††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2  
and 33ZCASPCO2 accessories.  
Fig. 29 — Supply Air Sensor Location  
—16—  
Outdoor Dry Bulb Changeover  
The standard controller is shipped from the factory configured  
for outdoor dry bulb changeover control. The outdoor air and  
supply air temperature sensors are included as standard. For  
this control mode, the outdoor temperature is compared to an  
adjustable set point selected on the control. If the outdoor-air  
temperature is above the set point, the EconoMi$er IV will  
adjust the outdoor-air dampers to minimum position. If the  
outdoor-air temperature is below the set point, the position of  
the outdoor-air dampers will be controlled to provide free cool-  
ing using outdoor air. When in this mode, the LED next to the  
free cooling set point potentiometer will be on. The changeover  
temperature set point is controlled by the free cooling set point  
potentiometer located on the control. See Fig. 30. The scale on  
the potentiometer is A, B, C, and D. See Fig. 31 for the corre-  
sponding temperature changeover values.  
Differential Dry Bulb Control  
For differential dry bulb control the standard outdoor dry  
bulb sensor is used in conjunction with an additional acces-  
sory dry bulb sensor (part number CRTEMPSN002A00). The  
accessory sensor must be mounted in the return airstream.  
See Fig. 32. Wiring is provided in the EconoMi$er IV wiring  
harness. See Fig. 25.  
Fig. 30 — EconoMi$er IV Controller Potentiometer  
and LED Locations  
19  
LED ON  
18  
D
In this mode of operation, the outdoor-air temperature is  
compared to the return-air temperature and the lower tem-  
perature airstream is used for cooling. When using this mode  
of changeover control, turn the enthalpy set point potentiom-  
eter fully clockwise to the D setting. See Fig. 30.  
17  
LED ON  
LED OFF  
16  
15  
14  
C
LED ON  
LED OFF  
B
13  
12  
Outdoor Enthalpy Changeover  
LED ON  
For enthalpy control, accessory enthalpy sensor (part num-  
ber HH57AC078) is required. Replace the standard outdoor  
dry bulb temperature sensor with the accessory enthalpy  
sensor in the same mounting location. See Fig. 19. When the  
outdoor air enthalpy rises above the outdoor enthalpy  
changeover set point, the outdoor-air damper moves to its  
minimum position. The outdoor enthalpy changeover set  
point is set with the outdoor enthalpy set point potentiome-  
ter on the EconoMi$er IV controller. The set points are A, B,  
C, and D. See Fig. 33. The factory-installed 620-ohm jumper  
must be in place across terminals SR and SR+ on the  
EconoMi$er IV controller. See Fig. 19 and 34.  
LED OFF  
A
11  
10  
9
LED OFF  
85 90  
95  
100  
50  
55 60  
70 75  
40 45  
65  
80  
DEGREES FAHRENHEIT  
Fig. 31 — Outdoor Air Temperature Changeover Set Points  
ECONOMI$ER IV  
CONTROLLER  
Differential Enthalpy Control  
ECONOMI$ER IV  
For differential enthalpy control, the EconoMi$er IV control-  
ler uses two enthalpy sensors (HH57AC078 and  
CRENTDIF004A00), one in the outside air and one in the  
return air duct. The EconoMi$er IV controller compares the  
outdoor air enthalpy to the return air enthalpy to determine  
EconoMi$er IV use. The controller selects the lower enthalpy  
air (return or outdoor) for cooling. For example, when the  
outdoor air has a lower enthalpy than the return air, the  
EconoMi$er IV opens to bring in outdoor air for free cooling.  
GROMMET  
Replace the standard outside air dry bulb temperature sensor  
with the accessory enthalpy sensor in the same mounting loca-  
tion. See Fig. 19. Mount the return air enthalpy sensor in the  
return air duct. See Fig. 32. Wiring is provided in the  
EconoMi$er IV wiring harness. See Fig. 25. The outdoor  
enthalpy changeover set point is set with the outdoor enthalpy  
set point potentiometer on the EconoMi$er IV controller. When  
using this mode of changeover control, turn the enthalpy set-  
point potentiometer fully clockwise to the D setting.  
RETURN AIR  
SENSOR  
RETURN DUCT  
(FIELD-PROVIDED)  
Fig. 32 — Return Air Temperature or  
Enthalpy Sensor Mounting Location  
—17—  
Indoor Air Quality (IAQ) Sensor Input  
AQ1 terminals of the controller. Adjust the DCV potentiome-  
ters to correspond to the DCV voltage output of the indoor air  
quality sensor at the user-determined set point. See Fig. 35.  
The IAQ input can be used for demand control ventilation  
control based on the level of CO2 measured in the space or  
return air duct.  
If a separate field-supplied transformer is used to power the  
IAQ sensor, the sensor must not be grounded or the  
EconoMi$er IV control board will be damaged.  
Mount the accessory IAQ sensor according to manufacturer  
specifications. The IAQ sensor should be wired to the AQ and  
85  
90  
95 100 105 110  
(29) (32) (35) (38) (41) (43)  
CONTROL CONTROL POINT  
CURVE  
APPROX. °F (°C)  
AT 50% RH  
80  
(27)  
A
B
C
D
73 (23)  
70 (21)  
67 (19)  
63 (17)  
75  
(24)  
70  
(21)  
65  
(18)  
60  
(16)  
A
55  
(13)  
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
35  
(2)  
A
B
C
D
HIGH LIMIT  
CURVE  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95 100 105 110  
(2)  
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)  
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)  
Fig. 33 — Enthalpy Changeover Set Points  
CO SENSOR MAX RANGE SETTING  
2
TR1  
EXH  
Set  
TR  
N1  
6000  
5000  
4000  
3000  
2000  
1000  
0
N
2V  
10V  
EXH  
24  
Vac  
HOT  
24 Vac  
COM  
P1  
T1  
P
T
Min  
Pos  
_
800 ppm  
900 ppm  
1000 ppm  
1100 ppm  
+
Open  
DCV  
Max  
10V  
1
2
5
2V  
AQ1  
AQ  
SO+  
SO  
SR+  
SR  
DCV  
DCV  
Set  
4
3
2V  
10V  
2
3
4
5
6
7
8
Free  
Cool  
EF1  
EF  
DAMPER VOLTAGE FOR MAX VENTILATION RATE  
C
B
Fig. 35 — CO2 Sensor Maximum Range Setting  
D
A
Fig. 34 — EconoMi$er IV Control  
—18—  
Exhaust Set Point Adjustment  
To control the minimum damper position remotely, remove  
the factory-installed jumper on the P and P1 terminals on  
the EconoMi$er IV controller. Wire the field-supplied poten-  
tiometer to the P and P1 terminals on the EconoMi$er IV  
controller. See Fig. 34.  
The exhaust set point will determine when the exhaust fan  
runs based on damper position (if accessory power exhaust is  
installed). The set point is modified with the Exhaust Fan  
Set Point (EXH SET) potentiometer. See Fig. 30. The set  
point represents the damper position above which the  
exhaust fans will be turned on. When there is a call for  
exhaust, the EconoMi$er IV controller provides a 45 ±  
15 second delay before exhaust fan activation to allow the  
dampers to open. This delay allows the damper to reach the  
appropriate position to avoid unnecessary fan overload.  
Damper Movement  
Damper movement from full open to full closed (or vice  
versa) takes 21/2 minutes.  
Thermostats  
The EconoMi$er IV control works with conventional thermo-  
stats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1  
Minimum Position Control  
(heat stage 1), W2 (heat stage 2), and  
G
(fan). The  
There is a minimum damper position potentiometer on the  
EconoMi$er IV controller. See Fig. 30. The minimum damper  
position maintains the minimum airflow into the building  
during the occupied period.  
EconoMi$er IV control does not support space temperature  
sensors. Connections are made at the thermostat terminal  
connection board located in the main control box.  
Occupancy Control  
When using demand ventilation, the minimum damper posi-  
tion represents the minimum ventilation position for VOC  
(volatile organic compound) ventilation requirements. The  
maximum demand ventilation position is used for fully occu-  
pied ventilation.  
The factory default configuration for the EconoMi$er IV con-  
trol is occupied mode. Occupied status is provided by the  
black jumper from terminal TR to terminal N. When unoccu-  
pied mode is desired, install a field-supplied timeclock func-  
tion in place of the jumper between TR and N. See Fig. 25.  
When the timeclock contacts are closed, the EconoMi$er IV  
control will be in occupied mode. When the timeclock con-  
tacts are open (removing the 24-v signal from terminal N),  
the EconoMi$er IV will be in unoccupied mode.  
When demand ventilation control is not being used, the min-  
imum position potentiometer should be used to set the occu-  
pied ventilation position. The maximum demand ventilation  
position should be turned fully clockwise.  
Adjust the minimum position potentiometer to allow the  
minimum amount of outdoor air, as required by local codes,  
to enter the building. Make minimum position adjustments  
with at least 10 F temperature difference between the out-  
door and return-air temperatures.  
Demand Controlled Ventilation (DCV)  
When using the EconoMi$er IV for demand controlled venti-  
lation, there are some equipment selection criteria which  
should be considered. When selecting the heat capacity and  
cool capacity of the equipment, the maximum ventilation  
rate must be evaluated for design conditions. The maximum  
damper position must be calculated to provide the desired  
fresh air.  
To determine the minimum position setting, perform the  
following procedure:  
1. Calculate the appropriate mixed-air temperature  
using the following formula:  
Typically the maximum ventilation rate will be about 5 to  
10% more than the typical cfm required per person, using  
normal outside air design criteria.  
OA  
100  
RA  
100  
(TO  
x
) + (TR  
x
) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
A proportional anticipatory strategy should be taken with  
the following conditions: a zone with a large area, varied  
occupancy, and equipment that cannot exceed the required  
ventilation rate at design conditions. Exceeding the required  
ventilation rate means the equipment can condition air at a  
maximum ventilation rate that is greater than the required  
ventilation rate for maximum occupancy. A proportional-  
anticipatory strategy will cause the fresh air supplied to  
increase as the room CO2 level increases even though the  
CO2 set point has not been reached. By the time the CO2  
level reaches the set point, the damper will be at maximum  
ventilation and should maintain the set point.  
As an example, if local codes require 10% outdoor air  
during occupied conditions, outdoor-air temperature  
is 60 F, and return-air temperature is 75 F.  
(60 x .10) + (75 x .90) = 73.5 F  
2. Disconnect the supply air sensor from terminals T  
and T1.  
3. Ensure that the factory-installed jumper is in place  
across terminals P and P1. If remote damper posi-  
tioning is being used, make sure that the terminals  
are wired according to Fig. 25 and that the minimum  
position potentiometer is turned fully clockwise.  
In order to have the CO2 sensor control the economizer  
damper in this manner, first determine the damper voltage  
output for minimum or base ventilation. Base ventilation is  
the ventilation required to remove contaminants during  
unoccupied periods. The following equation may be used to  
determine the percent of outside-air entering the building for  
a given damper position. For best results there should be at  
4. Connect 24 vac across terminals TR and TR1.  
5. Carefully adjust the minimum position potentiometer  
until the measured mixed-air temperature matches  
the calculated value.  
least  
a
10 degree difference in outside and return-air  
temperatures.  
OA  
100  
RA  
100  
6. Reconnect the supply-air sensor to terminals T and T1.  
Remote control of the EconoMi$er IV damper is desirable  
(TO  
x
) + (TR  
x
) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
when requiring additional temporary ventilation. If  
a
field-supplied remote potentiometer (Honeywell part num-  
ber S963B1128) is wired to the EconoMi$er IV controller, the  
minimum position of the damper can be controlled from a  
remote location.  
—19—  
Once base ventilation has been determined, set the mini-  
mum damper position potentiometer to the correct position.  
3. Use the Up/Down button to select the preset number.  
See Table 7.  
The same equation can be used to determine the occupied or  
maximum ventilation rate to the building. For example, an  
output of 3.6 volts to the actuator provides a base ventilation  
rate of 5% and an output of 6.7 volts provides the maximum  
ventilation rate of 20% (or base plus 15 cfm per person). Use  
Fig. 35 to determine the maximum setting of the CO2 sensor.  
For example, a 1100 ppm set point relates to a 15 cfm per  
person design. Use the 1100 ppm curve on Fig. 35 to find the  
point when the CO2 sensor output will be 6.7 volts. Line up  
the point on the graph with the left side of the chart to deter-  
mine that the range configuration for the CO2 sensor should  
be 1800 ppm. The EconoMi$er IV controller will output the  
6.7 volts from the CO2 sensor to the actuator when the CO2  
concentration in the space is at 1100 ppm. The DCV set point  
may be left at 2 volts since the CO2 sensor voltage will be  
ignored by the EconoMi$er IV controller until it rises above  
the 3.6 volt setting of the minimum position potentiometer.  
4. Press Enter to lock in the selection.  
5. Press Mode to exit and resume normal operation.  
The custom settings of the CO2 sensor can be changed any-  
time after the sensor is energized. Follow the steps below to  
change the non-standard settings:  
1. Press Clear and Mode buttons. Hold at least 5 sec-  
onds until the sensor enters the Edit mode.  
2. Press Mode twice. The STDSET Menu will appear.  
3. Use the Up/Down button to toggle to the NONSTD  
menu and press Enter.  
4. Use the Up/Down button to toggle through each of  
the nine variables, starting with Altitude, until the  
desired setting is reached.  
5. Press Mode to move through the variables.  
6. Press Enter to lock in the selection, then press Mode  
to continue to the next variable.  
Once the fully occupied damper position has been deter-  
mined, set the maximum damper demand control ventilation  
potentiometer to this position. Do not set to the maximum  
position as this can result in over-ventilation to the space  
and potential high-humidity levels.  
Dehumidification of Fresh Air with DCV Control  
Information from ASHRAE indicates that the largest humid-  
ity load on any zone is the fresh air introduced. For some  
applications, an energy recovery unit is added to reduce the  
moisture content of the fresh air being brought into the  
building when the enthalpy is high. In most cases, the nor-  
mal heating and cooling processes are more than adequate to  
remove the humidity loads for most commercial applications.  
CO2 Sensor Configuration  
The CO2 sensor has preset standard voltage settings that  
can be selected anytime after the sensor is powered up. See  
Table 7.  
Use setting 1 or 2 for Bryant equipment. See Table 7.  
If normal rooftop heating and cooling operation is not ade-  
quate for the outdoor humidity level, an energy recovery unit  
and/or a dehumidification option should be considered.  
1. Press Clear and Mode buttons. Hold at least 5 sec-  
onds until the sensor enters the Edit mode.  
2. Press Mode twice. The STDSET Menu will appear.  
Table 7 — CO2 Sensor Standard Settings  
VENTILATION  
RATE  
(cfm/Person)  
CO2  
CONTROL RANGE  
(ppm)  
OPTIONAL  
RELAY SETPOINT  
(ppm)  
RELAY  
HYSTERESIS  
(ppm)  
ANALOG  
OUTPUT  
SETTING  
EQUIPMENT  
OUTPUT  
0-10V  
1
2
3
4
5
6
7
8
9
Proportional  
Proportional  
Exponential  
Proportional  
Proportional  
Exponential  
Exponential  
Proportional  
Proportional  
Any  
Any  
Any  
15  
0-2000  
0-2000  
0-2000  
0-1100  
0- 900  
0-1100  
0- 900  
0-9999  
0-2000  
1000  
1000  
1100  
1100  
900  
50  
50  
4-20 mA  
Interface w/Standard  
2-10V  
7-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
Building Control System  
50  
50  
20  
50  
Economizer  
15  
1100  
900  
50  
20  
50  
Health & Safety  
—
5000  
700  
500  
50  
Parking/Air Intakes/  
Loading Docks  
—
LEGEND  
ppm — Parts Per Million  
—20—  
VII. STEP 7 — ADJUST EVAPORATOR-FAN SPEED  
2. Slide fan pulley along fan shaft.  
3. Make angular alignment by loosening motor from  
mounting plate.  
Adjust evaporator-fan rpm to meet jobsite conditions.  
For units with electric heat, required minimum cfm is 2250  
for 551B090 and 102 and 3000 for 551B120 and 150. See  
Table 8 for exceptions.  
To adjust belt tension:  
1. Loosen fan motor mounting nuts.  
2. Size 090 — Slide motor mounting plate away from fan  
scroll for proper belt tension (1/2-in. deflection with  
8 to 10 lb of force) and tighten mounting nuts (see  
Fig. 37).  
Table 8 — Minimum Required Airflow Exceptions  
UNIT  
REQUIRED  
MINIMUM  
CFM  
UNIT  
551B  
UNIT  
HEATER  
kW  
CONFIG-  
URATION  
VOLTAGE  
Sizes 102-150 — Slide motor mounting plate down-  
ward to tighten belt tension. Secure motor mounting  
plate nuts. See Fig. 38. Use 1/2-in. deflection with 10 lb of  
force.  
208/230  
208/230  
42.4  
50.0  
Horizontal  
Horizontal  
Horizontal  
or Vertical  
3200  
3200  
120,150  
090-150  
460  
575  
50.0  
3200  
17.0  
34.0  
2800  
2350  
Horizontal  
or Vertical  
3. Adjust bolt and nut on mounting plate to secure  
motor in fixed position.  
Tables 9 and 10 show fan rpm at motor pulley settings for  
standard and high-static motors. Tables 11 and 12 show  
evaporator-fan motor data. See Tables 13 and 14 and Fig. 36  
for accessory and option static pressure drops. Refer to  
Tables 15-28 to determine fan speed settings.  
Fan motor pulleys are factory set for speed shown in Table 1.  
To change fan speeds:  
1. Shut off unit power supply and install lockout tag.  
2. Loosen belt by loosening fan motor mounting nuts.  
See Fig. 37 and 38.  
MOTOR MOUNTING  
PLATE NUTS  
3. Loosen movable pulley flange setscrew (see Fig. 39).  
4. Screw movable flange toward fixed flange to increase  
rpm or away from fixed flange to decrease rpm.  
Increasing fan rpm increases load on motor. Do not  
exceed maximum speed specified in Table 1.  
5. Set movable flange at nearest keyway of pulley hub  
and tighten setscrew. (See Table 1 for speed change  
for each full turn of pulley flange.)  
Fig. 37 — Typical Belt-Drive Motor Mounting for  
Size 090  
To align fan and motor pulleys:  
1. Loosen fan pulley setscrews.  
0.35  
0.3  
0.25  
0.2  
0.15  
0.1  
7.5 ton  
0.05  
0
8.5, 10 & 12.5 ton  
4000  
1000  
2000  
3000  
5000  
6000  
0
CFM  
Fig. 36 — Perfect Humidity™ Dehumidification System Static Pressure Drop (in. wg)  
—21—  
Fig. 38 — Typical Belt-Drive Motor Mounting for  
Sizes 102-150  
Fig. 39 — Indoor-Fan Pulley Adjustment  
Table 9 — Fan Rpm at Motor Pulley Setting*; Standard Motor/Drive  
MOTOR PULLEY TURNS OPEN  
UNIT  
551B  
1
0
/
1
11/2  
2
21/2  
3
31/2  
910  
925  
962  
4
41/2  
865  
880  
912  
5
51/2  
—
—
6
—
—
830  
2
090,102  
120  
150  
1085  
1080  
1130  
1060  
1060  
1112  
1035  
1035  
1087  
1010  
1015  
1062  
985  
990  
1037  
960  
970  
1212  
935  
950  
987  
890  
905  
937  
840  
860  
887  
862  
*Approximate fan rpm shown.  
Table 10 — Fan Rpm at Motor Pulley Setting*; High-Static Motor/Drive  
MOTOR PULLEY TURNS OPEN  
UNIT  
11/2  
2
21/2  
3
31/2  
915  
915  
962  
4
41/2  
878  
878  
912  
5
51/2  
—
—
6
—
—
830  
551B  
1
0
/
1
2
090  
102  
120  
1080  
1080  
1130  
1025  
1025  
1112  
1007  
1007  
1087  
988  
988  
1062  
970  
970  
1037  
952  
952  
1212  
933  
933  
987  
897  
897  
937  
860  
860  
887  
862  
*Approximate fan rpm shown.  
Table 11 — Evaporator-Fan Motor Data — Standard Motor  
UNIT  
551B  
UNIT  
MAXIMUM  
MAXIMUM  
MAXIMUM  
UNIT VOLTAGE  
PHASE  
CONTINUOUS BHP*  
OPERATING WATTS*  
AMP DRAW  
8.6  
208/230  
460  
575  
208/230  
460  
575  
090,102  
120  
Three  
Three  
Three  
2.90  
3.70  
5.25  
2615  
3775  
4400  
3.9  
3.9  
12.2  
5.5  
5.5  
208/230  
460  
17.3  
8.5  
150  
575  
8.5  
LEGEND  
BHP — Brake Horsepower  
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range  
of the motors can be utilized with confidence. Using your fan motors up to the ratings shown in this  
table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.  
—22—  
Table 12 — Evaporator-Fan Motor Data — High-Static Motors  
UNIT  
5551B  
UNIT  
PHASE  
MAXIMUM  
CONTINUOUS BHP*  
MAXIMUM  
OPERATING WATTS*  
MAXIMUM  
AMP DRAW  
UNIT VOLTAGE  
208/230  
460  
575  
208/230  
460  
12.2  
5.5  
5.5  
17.3  
8.5  
090,102  
120  
Three  
Three  
4.20  
5.25  
3775  
4400  
575  
8.5  
LEGEND  
BHP — Brake Horsepower  
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range  
of the motors can be utilized with confidence. Using your fan motors up to the ratings shown in this  
table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.  
Table 13 — Accessory/FIOP EconoMi$er IV Static Pressure* (in. wg)  
CFM  
COMPONENT  
2250  
0.06  
—
2500  
0.075  
0.1  
2750  
0.09  
0.125  
3000  
0.115  
0.15  
3250 3500 3750  
4000  
0.195  
0.275  
4250 4500  
4750  
5000  
5250 6250  
Vertical EconoMi$er IV  
Horizontal EconoMi$er IV  
0.13  
0.18  
0.15  
0.21  
0.17  
0.25  
0.22  
0.3  
0.25  
0.34  
0.285 0.325  
0.36  
—
—
—
0.388  
—
LEGEND  
FIOP — Factory-Installed Option  
*The static pressure must be added to external static pressure. The sum and the evaporator entering-  
air cfm should be used in conjunction with the Fan Performance tables to determine indoor blower  
rpm and watts.  
Table 14 — Accessory/FIOP Electric Heaters Static Pressure (in. wg)  
CFM  
COMPONENT  
2200  
0.02  
0.03  
2500  
0.03  
0.05  
3000  
0.05  
0.07  
3500  
0.065  
0.09  
4000  
0.08  
0.12  
4500  
0.10  
0.14  
5000  
0.12  
0.16  
5500  
0.14  
0.19  
6000  
0.155  
0.21  
1 Heater Module  
2 Heater Modules  
LEGEND  
FIOP — Factory-Installed Option  
*The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should  
be used in conjunction with the Fan Performance tables to determine indoor blower rpm and watts.  
GENERAL FAN PERFORMANCE NOTES  
1. Extensive motor and electrical testing on these units ensures that  
the full range of the motor can be utilized with confidence. Using  
fan motors up to the ratings shown will not result in nuisance trip-  
ping or premature motor failure. Unit warranty will not be affected.  
For additional information on motor performance refer to Evapora-  
tor-Fan Motor Data, Tables 11 and 12.  
2. Values include losses for filters, unit casing, and wet coils. See  
Tables 13 and 14 and Fig. 36 for accessory/FIOP static pressure  
information.  
3. Use of a field-supplied motor may affect wire sizing. Contact  
Bryant representative to verify.  
4. Interpolation is permissible. Do not extrapolate.  
—23—  
Table 15 — Fan Performance 551B090 — Vertical Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
511  
519  
534  
550  
558  
565  
581  
597  
613  
630  
646  
663  
679  
696  
713  
729  
746  
755  
0.53  
0.56  
0.61  
0.67  
0.71  
0.74  
0.81  
0.89  
0.97  
1.06  
1.15  
1.25  
1.35  
1.46  
1.58  
1.70  
1.83  
1.89  
492  
518  
591  
597  
611  
624  
631  
638  
652  
667  
681  
696  
711  
726  
741  
756  
772  
787  
803  
811  
0.73  
0.76  
0.82  
0.89  
0.93  
0.97  
1.04  
1.13  
1.22  
1.31  
1.41  
1.51  
1.62  
1.74  
1.86  
1.99  
2.13  
2.20  
680  
709  
660  
666  
678  
690  
697  
703  
716  
729  
742  
756  
770  
784  
798  
812  
827  
841  
856  
864  
0.95  
0.98  
1.05  
1.13  
1.17  
1.21  
1.29  
1.38  
1.48  
1.58  
1.68  
1.79  
1.91  
2.03  
2.16  
2.30  
2.44  
2.52  
885  
916  
722  
727  
739  
750  
756  
762  
774  
786  
799  
811  
824  
837  
851  
864  
878  
892  
906  
913  
1.19  
1.22  
1.30  
1.38  
1.42  
1.46  
1.55  
1.65  
1.75  
1.86  
1.97  
2.09  
2.21  
2.34  
2.48  
2.62  
2.77  
2.84  
1106  
1140  
1210  
1285  
1324  
1365  
1449  
1538  
1632  
1731  
1835  
1944  
2060  
2181  
2308  
2441  
2580  
2653  
779  
784  
795  
805  
811  
816  
828  
839  
851  
863  
875  
888  
900  
913  
926  
—
1.44  
1.48  
1.56  
1.64  
1.69  
1.73  
1.83  
1.93  
2.04  
2.15  
2.27  
2.39  
2.52  
2.66  
2.80  
—
1342  
1378  
1453  
1533  
1574  
1617  
1707  
1801  
1900  
2004  
2114  
2229  
2351  
2478  
2610  
—
571  
768  
982  
629  
832  
1051  
1088  
1125  
1204  
1287  
1376  
1469  
1568  
1672  
1781  
1896  
2017  
2144  
2277  
2346  
660  
866  
691  
901  
758  
974  
829  
1051  
1133  
1220  
1313  
1411  
1514  
1623  
1737  
1857  
1985  
2051  
905  
985  
1071  
1162  
1259  
1361  
1469  
1583  
1703  
1766  
—
—
—
—
—
—
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
832  
837  
847  
857  
862  
867  
878  
889  
900  
912  
923  
935  
947  
—
1.71  
1.75  
1.83  
1.92  
1.97  
2.02  
2.12  
2.23  
2.34  
2.46  
2.58  
2.71  
2.84  
—
1592  
1630  
1710  
1794  
1838  
1884  
1978  
2077  
2181  
2290  
2406  
2526  
2652  
—
882  
886  
896  
905  
910  
915  
926  
936  
947  
958  
969  
—
1.99  
2.03  
2.12  
2.22  
2.27  
2.32  
2.42  
2.54  
2.65  
2.78  
2.90  
—
1855  
1896  
1980  
2069  
2114  
2162  
2261  
2365  
2474  
2588  
2708  
—
928  
933  
942  
951  
956  
961  
971  
981  
—
2.29  
2.33  
2.43  
2.52  
2.58  
2.63  
2.74  
2.86  
—
2131  
2174  
2262  
2355  
2403  
2453  
2556  
2664  
—
973  
977  
986  
995  
999  
—
2.59  
2.64  
2.74  
2.84  
2.90  
—
2420  
2463  
2556  
2653  
2704  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 2.90.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 840 to 1085 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—24—  
Table 16 — Fan Performance 551B090 — Vertical Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
511  
519  
534  
550  
558  
565  
581  
597  
613  
630  
646  
663  
679  
696  
713  
729  
746  
755  
0.53  
0.56  
0.61  
0.67  
0.71  
0.74  
0.81  
0.89  
0.97  
1.06  
1.15  
1.25  
1.35  
1.46  
1.58  
1.70  
1.83  
1.89  
492  
518  
591  
597  
611  
624  
631  
638  
652  
667  
681  
696  
711  
726  
741  
756  
772  
787  
803  
811  
0.73  
0.76  
0.82  
0.89  
0.93  
0.97  
1.04  
1.13  
1.22  
1.31  
1.41  
1.51  
1.62  
1.74  
1.86  
1.99  
2.13  
2.20  
680  
709  
660  
666  
678  
690  
697  
703  
716  
729  
742  
756  
770  
784  
798  
812  
827  
841  
856  
864  
0.95  
0.98  
1.05  
1.13  
1.17  
1.21  
1.29  
1.38  
1.48  
1.58  
1.68  
1.79  
1.91  
2.03  
2.16  
2.30  
2.44  
2.52  
885  
916  
722  
727  
739  
750  
756  
762  
774  
786  
799  
811  
824  
837  
851  
864  
878  
892  
906  
913  
1.19  
1.22  
1.30  
1.38  
1.42  
1.46  
1.55  
1.65  
1.75  
1.86  
1.97  
2.09  
2.21  
2.34  
2.48  
2.62  
2.77  
2.84  
1106  
1140  
1210  
1285  
1324  
1365  
1449  
1538  
1632  
1731  
1835  
1944  
2060  
2181  
2308  
2441  
2580  
2653  
779  
784  
795  
805  
811  
816  
828  
839  
851  
863  
875  
888  
900  
913  
926  
939  
953  
959  
1.44  
1.48  
1.56  
1.64  
1.69  
1.73  
1.83  
1.93  
2.04  
2.15  
2.27  
2.39  
2.52  
2.66  
2.80  
2.95  
3.10  
3.18  
1342  
1378  
1453  
1533  
1574  
1617  
1707  
1801  
1900  
2004  
2114  
2229  
2351  
2478  
2610  
2749  
2894  
2969  
571  
768  
982  
629  
832  
1051  
1088  
1125  
1204  
1287  
1376  
1469  
1568  
1672  
1781  
1896  
2017  
2144  
2277  
2346  
660  
866  
691  
901  
758  
974  
829  
1051  
1133  
1220  
1313  
1411  
1514  
1623  
1737  
1857  
1985  
2051  
905  
985  
1071  
1162  
1259  
1361  
1469  
1583  
1703  
1766  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
832  
837  
847  
857  
862  
867  
878  
889  
900  
912  
923  
935  
947  
959  
972  
984  
997  
1004  
1.71  
1.75  
1.83  
1.92  
1.97  
2.02  
2.12  
2.23  
2.34  
2.46  
2.58  
2.71  
2.84  
2.99  
3.13  
3.29  
3.45  
3.54  
1592  
1630  
1710  
1794  
1838  
1884  
1978  
2077  
2181  
2290  
2406  
2526  
2652  
2785  
2923  
3068  
3218  
3296  
882  
886  
1.99  
2.03  
2.12  
2.22  
2.27  
2.32  
2.42  
2.54  
2.65  
2.78  
2.90  
3.04  
3.18  
3.33  
3.48  
3.64  
3.81  
3.90  
1855  
1896  
1980  
2069  
2114  
2162  
2261  
2365  
2474  
2588  
2708  
2834  
2966  
3103  
3246  
3396  
3553  
3633  
928  
933  
2.29  
2.33  
2.43  
2.52  
2.58  
2.63  
2.74  
2.86  
2.98  
3.11  
3.24  
3.38  
3.53  
3.68  
3.84  
4.01  
4.18  
—
2131  
2174  
2262  
2355  
2403  
2453  
2556  
2664  
2778  
2897  
3022  
3152  
3289  
3432  
3581  
3736  
3897  
—
973  
977  
986  
995  
999  
1004  
1013  
1023  
1033  
1043  
1053  
1064  
1075  
1086  
—
2.59  
2.64  
2.74  
2.84  
2.90  
2.95  
3.07  
3.19  
3.32  
3.45  
3.59  
3.73  
3.89  
4.04  
—
2420  
2463  
2556  
2653  
2704  
2755  
2862  
2975  
3094  
3217  
3347  
3482  
3623  
3771  
—
1015  
1020  
1028  
1037  
1041  
1045  
1055  
1064  
1073  
1083  
1093  
1103  
—
2.92  
2.97  
3.07  
3.18  
3.23  
3.29  
3.41  
3.54  
3.67  
3.80  
3.95  
4.10  
—
2720  
2766  
2861  
2962  
3014  
3068  
3180  
3297  
3419  
3547  
3682  
3821  
—
896  
942  
905  
951  
910  
956  
915  
961  
926  
971  
936  
981  
947  
991  
958  
1001  
1012  
1023  
1034  
1045  
1057  
1068  
1080  
—
969  
980  
992  
1003  
1015  
1027  
1040  
1046  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 4.20.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—25—  
Table 17 — Fan Performance 551B102 — Vertical Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
489  
502  
515  
529  
542  
556  
569  
583  
597  
611  
625  
639  
654  
668  
683  
697  
712  
726  
741  
0.41  
0.45  
0.50  
0.55  
0.59  
0.65  
0.70  
0.76  
0.83  
0.89  
0.96  
1.04  
1.11  
1.20  
1.28  
1.37  
1.47  
1.57  
1.67  
386  
424  
564  
576  
587  
599  
611  
623  
636  
648  
661  
674  
687  
700  
713  
726  
739  
753  
766  
780  
794  
0.54  
0.59  
0.64  
0.69  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.14  
1.22  
1.31  
1.39  
1.48  
1.58  
1.68  
1.79  
1.89  
506  
548  
629  
640  
650  
661  
672  
684  
695  
707  
718  
730  
742  
754  
767  
779  
792  
804  
817  
830  
843  
0.67  
0.72  
0.77  
0.83  
0.89  
0.95  
1.02  
1.09  
1.17  
1.24  
1.32  
1.41  
1.50  
1.59  
1.69  
1.79  
1.89  
2.00  
2.12  
625  
672  
688  
697  
707  
718  
728  
738  
749  
760  
771  
782  
794  
805  
817  
828  
840  
852  
864  
876  
889  
0.80  
0.85  
0.91  
0.98  
1.04  
1.11  
1.18  
1.26  
1.33  
1.42  
1.50  
1.59  
1.69  
1.78  
1.88  
1.99  
2.10  
2.22  
2.34  
745  
797  
741  
750  
760  
769  
779  
789  
799  
809  
820  
831  
841  
852  
863  
874  
886  
897  
909  
920  
932  
0.93  
0.99  
1.05  
1.12  
1.19  
1.26  
1.34  
1.42  
1.50  
1.59  
1.68  
1.78  
1.87  
1.98  
2.08  
2.20  
2.31  
2.43  
2.56  
866  
923  
465  
594  
723  
852  
982  
508  
642  
776  
910  
970  
1044  
1109  
1177  
1249  
1323  
1401  
1483  
1567  
1656  
1748  
1844  
1943  
2048  
2155  
2268  
2384  
555  
693  
832  
604  
748  
891  
1034  
1100  
1170  
1244  
1320  
1400  
1484  
1571  
1662  
1758  
1857  
1960  
2067  
2179  
656  
805  
953  
712  
865  
1018  
1086  
1158  
1233  
1312  
1395  
1481  
1572  
1666  
1764  
1866  
1973  
770  
929  
832  
996  
898  
1066  
1140  
1218  
1299  
1385  
1474  
1567  
1665  
1767  
967  
1040  
1116  
1197  
1281  
1370  
1462  
1559  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
791  
799  
808  
817  
827  
836  
846  
856  
866  
876  
886  
897  
907  
918  
929  
940  
951  
962  
973  
1.06  
1.12  
1.19  
1.26  
1.34  
1.42  
1.50  
1.58  
1.67  
1.76  
1.86  
1.96  
2.06  
2.17  
2.28  
2.40  
2.52  
2.65  
2.78  
988  
1049  
1113  
1179  
1249  
1322  
1398  
1477  
1559  
1645  
1734  
1827  
1924  
2025  
2130  
2238  
2351  
2468  
2589  
837  
845  
854  
863  
872  
881  
890  
899  
909  
919  
929  
939  
949  
959  
970  
980  
991  
1002  
—
1.19  
1.26  
1.34  
1.41  
1.49  
1.57  
1.66  
1.75  
1.84  
1.94  
2.04  
2.14  
2.25  
2.37  
2.48  
2.61  
2.73  
2.86  
—
1112  
1177  
1245  
1316  
1390  
1467  
1547  
1631  
1718  
1808  
1902  
2000  
2101  
2207  
2316  
2429  
2547  
2668  
—
881  
889  
897  
905  
914  
923  
932  
941  
950  
960  
969  
979  
989  
999  
1009  
1019  
—
1.33  
1.40  
1.48  
1.56  
1.64  
1.73  
1.82  
1.92  
2.01  
2.12  
2.22  
2.33  
2.44  
2.56  
2.68  
2.81  
—
1236  
1306  
1378  
1454  
1532  
1613  
1698  
1786  
1878  
1972  
2071  
2173  
2279  
2389  
2502  
2620  
—
922  
930  
938  
946  
954  
963  
972  
980  
989  
998  
1008  
1017  
1027  
1036  
1046  
—
1.46  
1.54  
1.62  
1.71  
1.80  
1.89  
1.98  
2.08  
2.19  
2.29  
2.40  
2.52  
2.63  
2.76  
2.88  
—
1362  
1436  
1513  
1592  
1675  
1761  
1849  
1942  
2038  
2137  
2240  
2347  
2457  
2571  
2690  
—
962  
969  
977  
985  
993  
1001  
1010  
1018  
1027  
1036  
1045  
1054  
1063  
—
1.60  
1.68  
1.77  
1.86  
1.95  
2.05  
2.15  
2.25  
2.36  
2.47  
2.58  
2.70  
2.83  
—
1490  
1568  
1648  
1732  
1819  
1909  
2002  
2099  
2199  
2303  
2410  
2521  
2636  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 2.90.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 840 to 1085 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—26—  
Table 18 — Fan Performance 551B102 — Vertical Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
489  
502  
515  
529  
542  
556  
569  
583  
597  
611  
625  
639  
654  
668  
683  
697  
712  
726  
741  
0.41  
0.45  
0.50  
0.55  
0.59  
0.65  
0.70  
0.76  
0.83  
0.89  
0.96  
1.04  
1.11  
1.20  
1.28  
1.37  
1.47  
1.57  
1.67  
386  
424  
564  
576  
587  
599  
611  
623  
636  
648  
661  
674  
687  
700  
713  
726  
739  
753  
766  
780  
794  
0.54  
0.59  
0.64  
0.69  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.14  
1.22  
1.31  
1.39  
1.48  
1.58  
1.68  
1.79  
1.89  
506  
548  
629  
640  
650  
661  
672  
684  
695  
707  
718  
730  
742  
754  
767  
779  
792  
804  
817  
830  
843  
0.67  
0.72  
0.77  
0.83  
0.89  
0.95  
1.02  
1.09  
1.17  
1.24  
1.32  
1.41  
1.50  
1.59  
1.69  
1.79  
1.89  
2.00  
2.12  
625  
672  
688  
697  
707  
718  
728  
738  
749  
760  
771  
782  
794  
805  
817  
828  
840  
852  
864  
876  
889  
0.80  
0.85  
0.91  
0.98  
1.04  
1.11  
1.18  
1.26  
1.33  
1.42  
1.50  
1.59  
1.69  
1.78  
1.88  
1.99  
2.10  
2.22  
2.34  
745  
797  
741  
750  
760  
769  
779  
789  
799  
809  
820  
831  
841  
852  
863  
874  
886  
897  
909  
920  
932  
0.93  
0.99  
1.05  
1.12  
1.19  
1.26  
1.34  
1.42  
1.50  
1.59  
1.68  
1.78  
1.87  
1.98  
2.08  
2.20  
2.31  
2.43  
2.56  
866  
923  
465  
594  
723  
852  
982  
508  
642  
776  
910  
970  
1044  
1109  
1177  
1249  
1323  
1401  
1483  
1567  
1656  
1748  
1844  
1943  
2048  
2155  
2268  
2384  
555  
693  
832  
604  
748  
891  
1034  
1100  
1170  
1244  
1320  
1400  
1484  
1571  
1662  
1758  
1857  
1960  
2067  
2179  
656  
805  
953  
712  
865  
1018  
1086  
1158  
1233  
1312  
1395  
1481  
1572  
1666  
1764  
1866  
1973  
770  
929  
832  
996  
898  
1066  
1140  
1218  
1299  
1385  
1474  
1567  
1665  
1767  
967  
1040  
1116  
1197  
1281  
1370  
1462  
1559  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
791  
799  
808  
817  
827  
836  
846  
856  
866  
876  
886  
897  
907  
918  
929  
940  
951  
962  
973  
1.06  
1.12  
1.19  
1.26  
1.34  
1.42  
1.50  
1.58  
1.67  
1.76  
1.86  
1.96  
2.06  
2.17  
2.28  
2.40  
2.52  
2.65  
2.78  
988  
1049  
1113  
1179  
1249  
1322  
1398  
1477  
1559  
1645  
1734  
1827  
1924  
2025  
2130  
2238  
2351  
2468  
2589  
837  
845  
854  
863  
872  
881  
890  
899  
909  
919  
929  
939  
949  
959  
970  
980  
991  
1002  
1013  
1.19  
1.26  
1.34  
1.41  
1.49  
1.57  
1.66  
1.75  
1.84  
1.94  
2.04  
2.14  
2.25  
2.37  
2.48  
2.61  
2.73  
2.86  
3.00  
1112  
1177  
1245  
1316  
1390  
1467  
1547  
1631  
1718  
1808  
1902  
2000  
2101  
2207  
2316  
2429  
2547  
2668  
2794  
881  
889  
1.33  
1.40  
1.48  
1.56  
1.64  
1.73  
1.82  
1.92  
2.01  
2.12  
2.22  
2.33  
2.44  
2.56  
2.68  
2.81  
2.94  
3.08  
3.22  
1236  
1306  
1378  
1454  
1532  
1613  
1698  
1786  
1878  
1972  
2071  
2173  
2279  
2389  
2502  
2620  
2743  
2869  
2999  
922  
930  
1.46  
1.54  
1.62  
1.71  
1.80  
1.89  
1.98  
2.08  
2.19  
2.29  
2.40  
2.52  
2.63  
2.76  
2.88  
3.02  
3.15  
3.29  
3.44  
1362  
1436  
1513  
1592  
1675  
1761  
1849  
1942  
2038  
2137  
2240  
2347  
2457  
2571  
2690  
2812  
2939  
3070  
3205  
962  
969  
1.60  
1.68  
1.77  
1.86  
1.95  
2.05  
2.15  
2.25  
2.36  
2.47  
2.58  
2.70  
2.83  
2.95  
3.09  
3.22  
3.36  
3.51  
3.66  
1490  
1568  
1648  
1732  
1819  
1909  
2002  
2099  
2199  
2303  
2410  
2521  
2636  
2755  
2877  
3004  
3136  
3271  
3411  
897  
938  
977  
905  
946  
985  
993  
914  
954  
923  
963  
1001  
1010  
1018  
1027  
1036  
1045  
1054  
1063  
1073  
1082  
1092  
1102  
1112  
1122  
932  
972  
941  
980  
950  
989  
960  
998  
969  
1008  
1017  
1027  
1036  
1046  
1056  
1066  
1076  
1087  
979  
989  
999  
1009  
1019  
1029  
1040  
1050  
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 4.20.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—27—  
Table 19 — Fan Performance 551B120 — Vertical Discharge Units; Standard Motor (Belt Drive*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
556  
569  
583  
597  
611  
625  
639  
654  
668  
683  
697  
712  
726  
741  
755  
770  
785  
800  
815  
829  
844  
0.65  
0.70  
0.76  
0.83  
0.89  
0.96  
1.04  
1.11  
1.20  
1.28  
1.37  
1.47  
1.57  
1.67  
1.78  
1.89  
2.01  
2.14  
2.26  
2.40  
2.54  
604  
656  
623  
636  
648  
661  
674  
687  
700  
713  
726  
739  
753  
766  
780  
794  
807  
821  
835  
849  
863  
877  
891  
0.80  
0.86  
0.93  
1.00  
1.07  
1.14  
1.22  
1.31  
1.39  
1.48  
1.58  
1.68  
1.79  
1.89  
2.01  
2.13  
2.25  
2.38  
2.51  
2.65  
2.80  
748  
805  
684  
695  
707  
718  
730  
742  
754  
767  
779  
792  
804  
817  
830  
843  
856  
869  
882  
895  
909  
922  
936  
0.95  
1.02  
1.09  
1.17  
1.24  
1.32  
1.41  
1.50  
1.59  
1.69  
1.79  
1.89  
2.00  
2.12  
2.23  
2.36  
2.49  
2.62  
2.76  
2.91  
3.06  
891  
953  
738  
749  
760  
771  
782  
794  
805  
817  
828  
840  
852  
864  
876  
889  
901  
914  
926  
939  
952  
965  
978  
1.11  
1.18  
1.26  
1.33  
1.42  
1.50  
1.59  
1.69  
1.78  
1.88  
1.99  
2.10  
2.22  
2.34  
2.46  
2.59  
2.72  
2.86  
3.01  
3.16  
3.31  
1034  
1100  
1170  
1244  
1320  
1400  
1484  
1571  
1662  
1758  
1857  
1960  
2067  
2179  
2295  
2415  
2541  
2670  
2805  
2944  
3089  
789  
799  
809  
820  
831  
841  
852  
863  
874  
886  
897  
909  
920  
932  
944  
956  
968  
980  
993  
1005  
1018  
1.26  
1.34  
1.42  
1.50  
1.59  
1.68  
1.78  
1.87  
1.98  
2.08  
2.20  
2.31  
2.43  
2.56  
2.69  
2.82  
2.96  
3.10  
3.25  
3.41  
3.57  
1177  
1249  
1323  
1401  
1483  
1567  
1656  
1748  
1844  
1943  
2048  
2155  
2268  
2384  
2505  
2630  
2760  
2895  
3034  
3178  
3328  
712  
865  
1018  
1086  
1158  
1233  
1312  
1395  
1481  
1572  
1666  
1764  
1866  
1973  
2084  
2200  
2320  
2445  
2575  
2709  
2849  
770  
929  
996  
832  
898  
1066  
1140  
1218  
1299  
1385  
1474  
1567  
1665  
1767  
1873  
1984  
2099  
2219  
2344  
2473  
2608  
967  
1040  
1116  
1197  
1281  
1370  
1462  
1559  
1660  
1766  
1876  
1991  
2111  
2235  
2365  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
836  
846  
856  
866  
876  
886  
897  
907  
918  
929  
940  
951  
962  
973  
985  
996  
1008  
1020  
1032  
1044  
—
1.42  
1.50  
1.58  
1.67  
1.76  
1.86  
1.96  
2.06  
2.17  
2.28  
2.40  
2.52  
2.65  
2.78  
2.91  
3.05  
3.20  
3.34  
3.50  
3.66  
—
1322  
1398  
1477  
1559  
1645  
1734  
1827  
1924  
2025  
2130  
2238  
2351  
2468  
2589  
2715  
2845  
2979  
3119  
3263  
3413  
—
881  
890  
899  
909  
919  
929  
939  
949  
959  
970  
980  
991  
1002  
1013  
1024  
1035  
1046  
1058  
—
1.57  
1.66  
1.75  
1.84  
1.94  
2.04  
2.14  
2.25  
2.37  
2.48  
2.61  
2.73  
2.86  
3.00  
3.14  
3.28  
3.43  
3.58  
—
1467  
1547  
1631  
1718  
1808  
1902  
2000  
2101  
2207  
2316  
2429  
2547  
2668  
2794  
2924  
3059  
3199  
3343  
—
923  
932  
941  
950  
960  
969  
979  
989  
999  
1009  
1019  
1029  
1040  
1050  
1061  
1072  
1083  
—
1.73  
1.82  
1.92  
2.01  
2.12  
2.22  
2.33  
2.44  
2.56  
2.68  
2.81  
2.94  
3.08  
3.22  
3.36  
3.51  
3.67  
—
1613  
1698  
1786  
1878  
1972  
2071  
2173  
2279  
2389  
2502  
2620  
2743  
2869  
2999  
3134  
3274  
3418  
—
963  
972  
980  
989  
998  
1008  
1017  
1027  
1036  
1046  
1056  
1066  
1076  
1087  
1097  
—
1.89  
1.98  
2.08  
2.19  
2.29  
2.40  
2.52  
2.63  
2.76  
2.88  
3.02  
3.15  
3.29  
3.44  
3.59  
—
1761  
1849  
1942  
2038  
2137  
2240  
2347  
2457  
2571  
2690  
2812  
2939  
3070  
3205  
3345  
—
1001  
1010  
1018  
1027  
1036  
1045  
1054  
1063  
1073  
1082  
1092  
1102  
1112  
1122  
—
2.05  
2.15  
2.25  
2.36  
2.47  
2.58  
2.70  
2.83  
2.95  
3.09  
3.22  
3.36  
3.51  
3.66  
—
1909  
2002  
2099  
2199  
2303  
2410  
2521  
2636  
2755  
2877  
3004  
3136  
3271  
3411  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 3.70.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—28—  
Table 20 — Fan Performance 551B120 — Vertical Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
556  
569  
583  
597  
611  
625  
639  
654  
668  
683  
697  
712  
726  
741  
755  
770  
785  
800  
815  
829  
844  
0.65  
0.70  
0.76  
0.83  
0.89  
0.96  
1.04  
1.11  
1.20  
1.28  
1.37  
1.47  
1.57  
1.67  
1.78  
1.89  
2.01  
2.14  
2.26  
2.40  
2.54  
604  
656  
623  
636  
648  
661  
674  
687  
700  
713  
726  
739  
753  
766  
780  
794  
807  
821  
835  
849  
863  
877  
891  
0.80  
0.86  
0.93  
1.00  
1.07  
1.14  
1.22  
1.31  
1.39  
1.48  
1.58  
1.68  
1.79  
1.89  
2.01  
2.13  
2.25  
2.38  
2.51  
2.65  
2.80  
748  
805  
684  
695  
707  
718  
730  
742  
754  
767  
779  
792  
804  
817  
830  
843  
856  
869  
882  
895  
909  
922  
936  
0.95  
1.02  
1.09  
1.17  
1.24  
1.32  
1.41  
1.50  
1.59  
1.69  
1.79  
1.89  
2.00  
2.12  
2.23  
2.36  
2.49  
2.62  
2.76  
2.91  
3.06  
891  
953  
738  
749  
760  
771  
782  
794  
805  
817  
828  
840  
852  
864  
876  
889  
901  
914  
926  
939  
952  
965  
978  
1.11  
1.18  
1.26  
1.33  
1.42  
1.50  
1.59  
1.69  
1.78  
1.88  
1.99  
2.10  
2.22  
2.34  
2.46  
2.59  
2.72  
2.86  
3.01  
3.16  
3.31  
1034  
1100  
1170  
1244  
1320  
1400  
1484  
1571  
1662  
1758  
1857  
1960  
2067  
2179  
2295  
2415  
2541  
2670  
2805  
2944  
3089  
789  
799  
809  
820  
831  
841  
852  
863  
874  
886  
897  
909  
920  
932  
944  
956  
968  
980  
993  
1005  
1018  
1.26  
1.34  
1.42  
1.50  
1.59  
1.68  
1.78  
1.87  
1.98  
2.08  
2.20  
2.31  
2.43  
2.56  
2.69  
2.82  
2.96  
3.10  
3.25  
3.41  
3.57  
1177  
1249  
1323  
1401  
1483  
1567  
1656  
1748  
1844  
1943  
2048  
2155  
2268  
2384  
2505  
2630  
2760  
2895  
3034  
3178  
3328  
712  
865  
1018  
1086  
1158  
1233  
1312  
1395  
1481  
1572  
1666  
1764  
1866  
1973  
2084  
2200  
2320  
2445  
2575  
2709  
2849  
770  
929  
996  
832  
898  
1066  
1140  
1218  
1299  
1385  
1474  
1567  
1665  
1767  
1873  
1984  
2099  
2219  
2344  
2473  
2608  
967  
1040  
1116  
1197  
1281  
1370  
1462  
1559  
1660  
1766  
1876  
1991  
2111  
2235  
2365  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
836  
846  
856  
866  
876  
886  
897  
907  
918  
929  
940  
951  
962  
973  
985  
996  
1008  
1020  
1032  
1044  
1056  
1.42  
1.50  
1.58  
1.67  
1.76  
1.86  
1.96  
2.06  
2.17  
2.28  
2.40  
2.52  
2.65  
2.78  
2.91  
3.05  
3.20  
3.34  
3.50  
3.66  
3.82  
1322  
1398  
1477  
1559  
1645  
1734  
1827  
1924  
2025  
2130  
2238  
2351  
2468  
2589  
2715  
2845  
2979  
3119  
3263  
3413  
3566  
881  
890  
1.57  
1.66  
1.75  
1.84  
1.94  
2.04  
2.14  
2.25  
2.37  
2.48  
2.61  
2.73  
2.86  
3.00  
3.14  
3.28  
3.43  
3.58  
3.74  
3.91  
4.08  
1467  
1547  
1631  
1718  
1808  
1902  
2000  
2101  
2207  
2316  
2429  
2547  
2668  
2794  
2924  
3059  
3199  
3343  
3492  
3646  
3805  
923  
932  
1.73  
1.82  
1.92  
2.01  
2.12  
2.22  
2.33  
2.44  
2.56  
2.68  
2.81  
2.94  
3.08  
3.22  
3.36  
3.51  
3.67  
3.83  
3.99  
4.16  
4.34  
1613  
1698  
1786  
1878  
1972  
2071  
2173  
2279  
2389  
2502  
2620  
2743  
2869  
2999  
3134  
3274  
3418  
3567  
3721  
3880  
4044  
963  
972  
1.89  
1.98  
2.08  
2.19  
2.29  
2.40  
2.52  
2.63  
2.76  
2.88  
3.02  
3.15  
3.29  
3.44  
3.59  
3.74  
3.90  
4.07  
4.24  
4.41  
4.59  
1761  
1849  
1942  
2038  
2137  
2240  
2347  
2457  
2571  
2690  
2812  
2939  
3070  
3205  
3345  
3489  
3638  
3792  
3950  
4113  
4282  
1001  
1010  
1018  
1027  
1036  
1045  
1054  
1063  
1073  
1082  
1092  
1102  
1112  
1122  
1132  
1142  
1152  
1163  
1174  
1184  
1195  
2.05  
2.15  
2.25  
2.36  
2.47  
2.58  
2.70  
2.83  
2.95  
3.09  
3.22  
3.36  
3.51  
3.66  
3.81  
3.97  
4.14  
4.31  
4.48  
4.66  
4.85  
1909  
2002  
2099  
2199  
2303  
2410  
2521  
2636  
2755  
2877  
3004  
3136  
3271  
3411  
3555  
3704  
3857  
4016  
4179  
4347  
4520  
899  
941  
980  
909  
950  
989  
998  
919  
960  
929  
969  
1008  
1017  
1027  
1036  
1046  
1056  
1066  
1076  
1087  
1097  
1108  
1118  
1129  
1140  
1151  
1162  
939  
979  
949  
989  
959  
999  
970  
1009  
1019  
1029  
1040  
1050  
1061  
1072  
1083  
1094  
1105  
1117  
1128  
980  
991  
1002  
1013  
1024  
1035  
1046  
1058  
1069  
1081  
1093  
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 5.25.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 830 to 1130 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—29—  
Table 21 — Fan Performance 551B150 — Vertical Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
5100  
5200  
5300  
5400  
5500  
5600  
5700  
5800  
5900  
6000  
6100  
6200  
6300  
654  
668  
683  
697  
712  
726  
741  
755  
770  
785  
800  
815  
829  
844  
859  
874  
889  
904  
920  
935  
950  
965  
980  
995  
1011  
1026  
1041  
1.11  
1.20  
1.28  
1.37  
1.47  
1.57  
1.67  
1.78  
1.89  
2.01  
2.14  
2.26  
2.40  
2.54  
2.68  
2.83  
2.99  
3.15  
3.32  
3.49  
3.67  
3.85  
4.05  
4.24  
4.45  
4.66  
4.88  
1040  
1116  
1197  
1281  
1370  
1462  
1559  
1660  
1766  
1876  
1991  
2111  
2235  
2365  
2499  
2640  
2784  
2936  
3092  
3253  
3421  
3594  
3773  
3958  
4149  
4347  
4550  
713  
726  
739  
753  
766  
780  
794  
807  
821  
835  
849  
863  
877  
891  
906  
920  
934  
949  
963  
977  
992  
1006  
1021  
1036  
1050  
1065  
—
1.31  
1.39  
1.48  
1.58  
1.68  
1.79  
1.89  
2.01  
2.13  
2.25  
2.38  
2.51  
2.65  
2.80  
2.95  
3.10  
3.26  
3.43  
3.60  
3.78  
3.97  
4.16  
4.35  
4.56  
4.77  
4.99  
—
1218  
1299  
1385  
1474  
1567  
1665  
1767  
1873  
1984  
2099  
2219  
2344  
2473  
2608  
2747  
2892  
3042  
3198  
3359  
3525  
3698  
3876  
4060  
4250  
4446  
4649  
—
767  
779  
792  
804  
817  
830  
843  
856  
869  
882  
895  
909  
922  
936  
949  
963  
977  
990  
1004  
1018  
1032  
1046  
1060  
1074  
1088  
—
1.50  
1.59  
1.69  
1.79  
1.89  
2.00  
2.12  
2.23  
2.36  
2.49  
2.62  
2.76  
2.91  
3.06  
3.21  
3.37  
3.54  
3.71  
3.89  
4.07  
4.26  
4.46  
4.66  
4.87  
5.09  
—
1395  
1481  
1572  
1666  
1764  
1866  
1973  
2084  
2200  
2320  
2445  
2575  
2709  
2849  
2994  
3143  
3298  
3459  
3625  
3796  
3974  
4157  
4346  
4541  
4742  
—
817  
828  
840  
852  
864  
876  
889  
901  
914  
926  
939  
952  
965  
978  
991  
1004  
1017  
1030  
1044  
1057  
1070  
1084  
1098  
1111  
—
1.69  
1.78  
1.88  
1.99  
2.10  
2.22  
2.34  
2.46  
2.59  
2.72  
2.86  
3.01  
3.16  
3.31  
3.47  
3.64  
3.81  
3.99  
4.17  
4.36  
4.56  
4.76  
4.97  
5.18  
—
1571  
1662  
1758  
1857  
1960  
2067  
2179  
2295  
2415  
2541  
2670  
2805  
2944  
3089  
3238  
3393  
3553  
3719  
3890  
4066  
4249  
4436  
4630  
4831  
—
863  
874  
886  
897  
909  
920  
932  
944  
956  
968  
980  
993  
1005  
1018  
1030  
1043  
1056  
1068  
1081  
1094  
1107  
1120  
—
1.87  
1.98  
2.08  
2.20  
2.31  
2.43  
2.56  
2.69  
2.82  
2.96  
3.10  
3.25  
3.41  
3.57  
3.73  
3.91  
4.08  
4.27  
4.45  
4.65  
4.85  
5.06  
—
1748  
1844  
1943  
2048  
2155  
2268  
2384  
2505  
2630  
2760  
2895  
3034  
3178  
3328  
3483  
3642  
3807  
3977  
4153  
4335  
4522  
4715  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
5100  
5200  
5300  
5400  
5500  
5600  
5700  
5800  
5900  
6000  
6100  
6200  
6300  
907  
918  
929  
940  
951  
962  
973  
985  
996  
1008  
1020  
1032  
1044  
1056  
1068  
1080  
1093  
1105  
1118  
1130  
—
2.06  
2.17  
2.28  
2.40  
2.52  
2.65  
2.78  
2.91  
3.05  
3.20  
3.34  
3.50  
3.66  
3.82  
4.00  
4.17  
4.35  
4.54  
4.74  
4.94  
—
1924  
2025  
2130  
2238  
2351  
2468  
2589  
2715  
2845  
2979  
3119  
3263  
3413  
3566  
3726  
3891  
4060  
4236  
4417  
4603  
—
949  
959  
970  
980  
991  
1002  
1013  
1024  
1035  
1046  
1058  
1069  
1081  
1093  
1104  
1116  
1128  
1140  
1152  
—
2.25  
2.37  
2.48  
2.61  
2.73  
2.86  
3.00  
3.14  
3.28  
3.43  
3.58  
3.74  
3.91  
4.08  
4.26  
4.44  
4.63  
4.82  
5.02  
—
2101  
2207  
2316  
2429  
2547  
2668  
2794  
2924  
3059  
3199  
3343  
3492  
3646  
3805  
3969  
4139  
4314  
4494  
4679  
—
989  
999  
1009  
1019  
1029  
1040  
1050  
1061  
1072  
1083  
1094  
1105  
1117  
1128  
1139  
1151  
1163  
1174  
—
2.44  
2.56  
2.68  
2.81  
2.94  
3.08  
3.22  
3.36  
3.51  
3.67  
3.83  
3.99  
4.16  
4.34  
4.52  
4.70  
4.90  
5.10  
—
2279  
2389  
2502  
2620  
2743  
2869  
2999  
3134  
3274  
3418  
3567  
3721  
3880  
4044  
4212  
4386  
4566  
4751  
—
1027  
1036  
1046  
1056  
1066  
1076  
1087  
1097  
1108  
1118  
1129  
1140  
1151  
1162  
1173  
1185  
1196  
—
2.63  
2.76  
2.88  
3.02  
3.15  
3.29  
3.44  
3.59  
3.74  
3.90  
4.07  
4.24  
4.41  
4.59  
4.78  
4.97  
5.17  
—
2457  
2571  
2690  
2812  
2939  
3070  
3205  
3345  
3489  
3638  
3792  
3950  
4113  
4282  
4456  
4634  
4819  
—
1063  
1073  
1082  
1092  
1102  
1112  
1122  
1132  
1142  
1152  
1163  
1174  
1184  
1195  
1206  
—
2.83  
2.95  
3.09  
3.22  
3.36  
3.51  
3.66  
3.81  
3.97  
4.14  
4.31  
4.48  
4.66  
4.85  
5.04  
—
2636  
2755  
2877  
3004  
3136  
3271  
3411  
3555  
3704  
3857  
4016  
4179  
4347  
4520  
4699  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 5.25.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 830 to 1130 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—30—  
Table 22 — Fan Performance 551B090 — Horizontal Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
465  
471  
483  
495  
501  
507  
519  
532  
544  
557  
570  
583  
596  
609  
622  
635  
649  
655  
0.43  
0.45  
0.49  
0.54  
0.56  
0.59  
0.64  
0.70  
0.75  
0.82  
0.88  
0.95  
1.03  
1.10  
1.19  
1.27  
1.36  
1.41  
402  
421  
555  
560  
571  
581  
587  
592  
603  
614  
625  
637  
648  
660  
672  
684  
696  
708  
720  
726  
0.64  
0.66  
0.71  
0.77  
0.79  
0.82  
0.88  
0.95  
1.01  
1.08  
1.16  
1.23  
1.32  
1.40  
1.49  
1.59  
1.69  
1.74  
596  
618  
629  
634  
644  
654  
659  
664  
674  
684  
695  
705  
716  
727  
738  
749  
760  
771  
783  
789  
0.86  
0.89  
0.94  
1.01  
1.04  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.81  
1.91  
2.02  
2.07  
802  
828  
694  
699  
708  
717  
722  
727  
737  
746  
756  
766  
776  
787  
797  
808  
818  
829  
840  
845  
1.10  
1.13  
1.19  
1.26  
1.29  
1.33  
1.40  
1.48  
1.56  
1.64  
1.73  
1.82  
1.92  
2.02  
2.13  
2.24  
2.35  
2.41  
1021  
1050  
1109  
1171  
1204  
1237  
1306  
1378  
1453  
1533  
1615  
1702  
1792  
1887  
1985  
2088  
2195  
2250  
753  
757  
766  
775  
779  
784  
793  
803  
812  
822  
831  
841  
851  
861  
872  
882  
892  
897  
1.34  
1.38  
1.45  
1.52  
1.56  
1.60  
1.68  
1.76  
1.85  
1.94  
2.03  
2.13  
2.24  
2.35  
2.46  
2.58  
2.70  
2.76  
1252  
1283  
1348  
1416  
1452  
1488  
1563  
1641  
1723  
1808  
1897  
1991  
2088  
2188  
2294  
2403  
2517  
2575  
461  
665  
881  
503  
715  
937  
526  
740  
967  
549  
767  
996  
597  
823  
1059  
1125  
1194  
1266  
1342  
1422  
1506  
1593  
1685  
1781  
1881  
1932  
649  
882  
703  
944  
761  
1009  
1079  
1151  
1228  
1308  
1392  
1481  
1573  
1621  
823  
888  
957  
1030  
1106  
1187  
1272  
1316  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
806  
811  
819  
828  
832  
836  
845  
854  
864  
873  
882  
892  
901  
911  
921  
—
1.60  
1.64  
1.71  
1.79  
1.83  
1.88  
1.96  
2.05  
2.15  
2.24  
2.35  
2.45  
2.56  
2.68  
2.80  
—
1494  
1528  
1599  
1672  
1710  
1749  
1830  
1914  
2002  
2093  
2189  
2288  
2391  
2499  
2610  
—
856  
860  
868  
877  
881  
885  
894  
903  
912  
921  
930  
939  
948  
—
1.87  
1.91  
1.99  
2.08  
2.12  
2.17  
2.26  
2.36  
2.46  
2.56  
2.67  
2.78  
2.90  
—
1747  
1784  
1859  
1938  
1979  
2021  
2107  
2197  
2290  
2388  
2489  
2595  
2704  
—
903  
907  
915  
923  
927  
931  
940  
948  
957  
966  
—
2.15  
2.20  
2.28  
2.37  
2.42  
2.47  
2.57  
2.67  
2.77  
2.89  
—
2009  
2048  
2129  
2214  
2258  
2302  
2394  
2488  
2587  
2691  
—
947  
950  
958  
966  
971  
975  
983  
—
2.45  
2.49  
2.58  
2.68  
2.73  
2.78  
2.88  
—
2282  
2323  
2410  
2499  
2545  
2592  
2689  
—
988  
992  
1000  
—
2.75  
2.80  
2.89  
—
2564  
2607  
2698  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 2.90.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 840 to 1085 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—31—  
Table 23 — Fan Performance 551B090 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
465  
471  
483  
495  
501  
507  
519  
532  
544  
557  
570  
583  
596  
609  
622  
635  
649  
655  
0.43  
0.45  
0.49  
0.54  
0.56  
0.59  
0.64  
0.70  
0.75  
0.82  
0.88  
0.95  
1.03  
1.10  
1.19  
1.27  
1.36  
1.41  
402  
421  
555  
560  
571  
581  
587  
592  
603  
614  
625  
637  
648  
660  
672  
684  
696  
708  
720  
726  
0.64  
0.66  
0.71  
0.77  
0.79  
0.82  
0.88  
0.95  
1.01  
1.08  
1.16  
1.23  
1.32  
1.40  
1.49  
1.59  
1.69  
1.74  
596  
618  
629  
634  
644  
654  
659  
664  
674  
684  
695  
705  
716  
727  
738  
749  
760  
771  
783  
789  
0.86  
0.89  
0.94  
1.01  
1.04  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.81  
1.91  
2.02  
2.07  
802  
828  
694  
699  
708  
717  
722  
727  
737  
746  
756  
766  
776  
787  
797  
808  
818  
829  
840  
845  
1.10  
1.13  
1.19  
1.26  
1.29  
1.33  
1.40  
1.48  
1.56  
1.64  
1.73  
1.82  
1.92  
2.02  
2.13  
2.24  
2.35  
2.41  
1021  
1050  
1109  
1171  
1204  
1237  
1306  
1378  
1453  
1533  
1615  
1702  
1792  
1887  
1985  
2088  
2195  
2250  
753  
757  
766  
775  
779  
784  
793  
803  
812  
822  
831  
841  
851  
861  
872  
882  
892  
897  
1.34  
1.38  
1.45  
1.52  
1.56  
1.60  
1.68  
1.76  
1.85  
1.94  
2.03  
2.13  
2.24  
2.35  
2.46  
2.58  
2.70  
2.76  
1252  
1283  
1348  
1416  
1452  
1488  
1563  
1641  
1723  
1808  
1897  
1991  
2088  
2188  
2294  
2403  
2517  
2575  
461  
665  
881  
503  
715  
937  
526  
740  
967  
549  
767  
996  
597  
823  
1059  
1125  
1194  
1266  
1342  
1422  
1506  
1593  
1685  
1781  
1881  
1932  
649  
882  
703  
944  
761  
1009  
1079  
1151  
1228  
1308  
1392  
1481  
1573  
1621  
823  
888  
957  
1030  
1106  
1187  
1272  
1316  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2250  
2300  
2400  
2500  
2550  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3750  
806  
811  
819  
828  
832  
836  
845  
854  
864  
873  
882  
892  
901  
911  
921  
931  
941  
946  
1.60  
1.64  
1.71  
1.79  
1.83  
1.88  
1.96  
2.05  
2.15  
2.24  
2.35  
2.45  
2.56  
2.68  
2.80  
2.92  
3.05  
3.12  
1494  
1528  
1599  
1672  
1710  
1749  
1830  
1914  
2002  
2093  
2189  
2288  
2391  
2499  
2610  
2726  
2847  
2908  
856  
860  
868  
877  
881  
885  
894  
903  
912  
921  
930  
939  
948  
958  
967  
977  
987  
992  
1.87  
1.91  
1.99  
2.08  
2.12  
2.17  
2.26  
2.36  
2.46  
2.56  
2.67  
2.78  
2.90  
3.02  
3.15  
3.28  
3.41  
3.48  
1747  
1784  
1859  
1938  
1979  
2021  
2107  
2197  
2290  
2388  
2489  
2595  
2704  
2817  
2935  
3057  
3184  
3249  
903  
907  
2.15  
2.20  
2.28  
2.37  
2.42  
2.47  
2.57  
2.67  
2.77  
2.89  
3.00  
3.12  
3.24  
3.37  
3.50  
3.64  
3.78  
3.86  
2009  
2048  
2129  
2214  
2258  
2302  
2394  
2488  
2587  
2691  
2798  
2909  
3024  
3144  
3268  
3396  
3529  
3597  
947  
950  
2.45  
2.49  
2.58  
2.68  
2.73  
2.78  
2.88  
2.99  
3.10  
3.22  
3.34  
3.47  
3.60  
3.73  
3.87  
4.01  
4.16  
—
2282  
2323  
2410  
2499  
2545  
2592  
2689  
2790  
2894  
3003  
3115  
3233  
3353  
3479  
3608  
3743  
3882  
—
988  
992  
2.75  
2.80  
2.89  
3.00  
3.05  
3.10  
3.21  
3.32  
3.44  
3.56  
3.69  
3.82  
3.96  
4.10  
—
2564  
2607  
2698  
2793  
2842  
2891  
2993  
3099  
3209  
3323  
3441  
3564  
3690  
3821  
—
915  
958  
1000  
1008  
1012  
1016  
1024  
1032  
1041  
1049  
1057  
1066  
1075  
1084  
—
923  
966  
927  
971  
931  
975  
940  
983  
948  
991  
957  
1000  
1008  
1017  
1026  
1035  
1044  
1053  
1062  
1071  
—
966  
975  
984  
993  
1002  
1011  
1021  
1030  
1035  
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 4.20.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—32—  
Table 24 — Fan Performance 551B102 — Horizontal Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
462  
474  
486  
498  
510  
523  
536  
549  
562  
575  
588  
601  
614  
628  
641  
655  
668  
682  
696  
0.37  
0.41  
0.45  
0.49  
0.53  
0.58  
0.63  
0.68  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.15  
1.23  
1.31  
1.40  
1.49  
348  
381  
541  
551  
561  
571  
581  
592  
603  
614  
626  
637  
649  
661  
673  
685  
697  
709  
722  
734  
747  
0.50  
0.54  
0.58  
0.63  
0.68  
0.73  
0.78  
0.84  
0.90  
0.96  
1.03  
1.10  
1.17  
1.25  
1.33  
1.42  
1.51  
1.60  
1.70  
467  
505  
614  
622  
630  
639  
648  
657  
666  
676  
686  
696  
707  
717  
728  
739  
750  
761  
773  
784  
796  
0.64  
0.68  
0.73  
0.78  
0.83  
0.88  
0.94  
1.00  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.80  
1.91  
594  
635  
681  
688  
695  
702  
710  
718  
726  
735  
743  
752  
762  
771  
781  
791  
801  
812  
822  
833  
844  
0.78  
0.83  
0.88  
0.93  
0.99  
1.05  
1.11  
1.17  
1.24  
1.31  
1.39  
1.47  
1.55  
1.64  
1.72  
1.82  
1.92  
2.02  
2.12  
728  
773  
744  
750  
756  
762  
768  
775  
783  
790  
798  
806  
815  
823  
832  
841  
850  
860  
870  
880  
890  
0.93  
0.98  
1.04  
1.09  
1.15  
1.22  
1.28  
1.35  
1.42  
1.50  
1.58  
1.66  
1.75  
1.84  
1.93  
2.03  
2.13  
2.23  
2.34  
868  
916  
417  
545  
679  
820  
967  
456  
587  
725  
870  
1020  
1076  
1135  
1196  
1260  
1328  
1398  
1472  
1548  
1629  
1712  
1799  
1890  
1984  
2082  
2184  
497  
632  
774  
922  
541  
680  
825  
977  
587  
730  
879  
1035  
1096  
1159  
1226  
1296  
1369  
1445  
1525  
1608  
1695  
1786  
1880  
1979  
637  
783  
936  
689  
839  
996  
744  
898  
1059  
1125  
1194  
1267  
1343  
1423  
1506  
1593  
1683  
1777  
802  
961  
864  
1026  
1095  
1167  
1243  
1322  
1405  
1492  
1582  
929  
997  
1069  
1144  
1223  
1305  
1392  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
804  
809  
813  
819  
824  
830  
837  
843  
850  
858  
865  
873  
881  
889  
898  
907  
916  
925  
934  
1.09  
1.14  
1.20  
1.26  
1.32  
1.39  
1.46  
1.53  
1.61  
1.69  
1.77  
1.86  
1.95  
2.04  
2.14  
2.24  
2.35  
2.45  
2.57  
1013  
1065  
1119  
1176  
1235  
1298  
1363  
1431  
1502  
1576  
1653  
1733  
1816  
1904  
1995  
2089  
2187  
2289  
2395  
861  
864  
869  
873  
878  
883  
889  
894  
901  
907  
914  
921  
928  
936  
944  
952  
960  
969  
978  
1.25  
1.31  
1.37  
1.43  
1.50  
1.57  
1.65  
1.72  
1.80  
1.88  
1.97  
2.06  
2.16  
2.25  
2.35  
2.46  
2.57  
2.68  
2.80  
1164  
1219  
1277  
1337  
1400  
1466  
1534  
1606  
1680  
1758  
1838  
1922  
2010  
2100  
2195  
2293  
2395  
2500  
2610  
915  
918  
921  
925  
929  
934  
938  
944  
949  
955  
961  
967  
974  
981  
988  
996  
1004  
—
1.41  
1.48  
1.54  
1.61  
1.68  
1.76  
1.83  
1.91  
2.00  
2.09  
2.18  
2.27  
2.37  
2.47  
2.57  
2.68  
2.80  
—
1319  
1378  
1439  
1503  
1569  
1638  
1710  
1785  
1863  
1944  
2029  
2116  
2207  
2302  
2399  
2501  
2607  
—
967  
969  
972  
975  
978  
982  
986  
991  
996  
1001  
1007  
1012  
1019  
1025  
1032  
—
1.59  
1.65  
1.72  
1.79  
1.87  
1.95  
2.03  
2.11  
2.20  
2.29  
2.38  
2.48  
2.58  
2.69  
2.80  
—
1479  
1541  
1606  
1673  
1742  
1815  
1891  
1969  
2051  
2135  
2223  
2314  
2409  
2507  
2608  
—
1017  
1018  
1021  
1023  
1026  
1029  
1033  
1037  
1041  
1046  
1051  
1056  
1062  
—
1.76  
1.83  
1.90  
1.98  
2.06  
2.14  
2.23  
2.31  
2.40  
2.50  
2.60  
2.70  
2.80  
—
1642  
1708  
1776  
1847  
1920  
1996  
2075  
2157  
2242  
2331  
2422  
2516  
2615  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 2.90.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 840 to 1085 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—33—  
Table 25 — Fan Performance 551B102 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
462  
474  
486  
498  
510  
523  
536  
549  
562  
575  
588  
601  
614  
628  
641  
655  
668  
682  
696  
0.37  
0.41  
0.45  
0.49  
0.53  
0.58  
0.63  
0.68  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.15  
1.23  
1.31  
1.40  
1.49  
348  
381  
541  
551  
561  
571  
581  
592  
603  
614  
626  
637  
649  
661  
673  
685  
697  
709  
722  
734  
747  
0.50  
0.54  
0.58  
0.63  
0.68  
0.73  
0.78  
0.84  
0.90  
0.96  
1.03  
1.10  
1.17  
1.25  
1.33  
1.42  
1.51  
1.60  
1.70  
467  
505  
614  
622  
630  
639  
648  
657  
666  
676  
686  
696  
707  
717  
728  
739  
750  
761  
773  
784  
796  
0.64  
0.68  
0.73  
0.78  
0.83  
0.88  
0.94  
1.00  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.80  
1.91  
594  
635  
681  
688  
695  
702  
710  
718  
726  
735  
743  
752  
762  
771  
781  
791  
801  
812  
822  
833  
844  
0.78  
0.83  
0.88  
0.93  
0.99  
1.05  
1.11  
1.17  
1.24  
1.31  
1.39  
1.47  
1.55  
1.64  
1.72  
1.82  
1.92  
2.02  
2.12  
728  
773  
744  
750  
756  
762  
768  
775  
783  
790  
798  
806  
815  
823  
832  
841  
850  
860  
870  
880  
890  
0.93  
0.98  
1.04  
1.09  
1.15  
1.22  
1.28  
1.35  
1.42  
1.50  
1.58  
1.66  
1.75  
1.84  
1.93  
2.03  
2.13  
2.23  
2.34  
868  
916  
417  
545  
679  
820  
967  
456  
587  
725  
870  
1020  
1076  
1135  
1196  
1260  
1328  
1398  
1472  
1548  
1629  
1712  
1799  
1890  
1984  
2082  
2184  
497  
632  
774  
922  
541  
680  
825  
977  
587  
730  
879  
1035  
1096  
1159  
1226  
1296  
1369  
1445  
1525  
1608  
1695  
1786  
1880  
1979  
637  
783  
936  
689  
839  
996  
744  
898  
1059  
1125  
1194  
1267  
1343  
1423  
1506  
1593  
1683  
1777  
802  
961  
864  
1026  
1095  
1167  
1243  
1322  
1405  
1492  
1582  
929  
997  
1069  
1144  
1223  
1305  
1392  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
2500  
2600  
2700  
2800  
2900  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
804  
809  
813  
819  
824  
830  
837  
843  
850  
858  
865  
873  
881  
889  
898  
907  
916  
925  
934  
1.09  
1.14  
1.20  
1.26  
1.32  
1.39  
1.46  
1.53  
1.61  
1.69  
1.77  
1.86  
1.95  
2.04  
2.14  
2.24  
2.35  
2.45  
2.57  
1013  
1065  
1119  
1176  
1235  
1298  
1363  
1431  
1502  
1576  
1653  
1733  
1816  
1904  
1995  
2089  
2187  
2289  
2395  
861  
864  
869  
873  
878  
883  
889  
894  
901  
907  
914  
921  
928  
936  
944  
952  
960  
969  
978  
1.25  
1.31  
1.37  
1.43  
1.50  
1.57  
1.65  
1.72  
1.80  
1.88  
1.97  
2.06  
2.16  
2.25  
2.35  
2.46  
2.57  
2.68  
2.80  
1164  
1219  
1277  
1337  
1400  
1466  
1534  
1606  
1680  
1758  
1838  
1922  
2010  
2100  
2195  
2293  
2395  
2500  
2610  
915  
918  
921  
925  
929  
934  
938  
944  
949  
955  
961  
967  
974  
981  
988  
996  
1004  
1011  
1020  
1.41  
1.48  
1.54  
1.61  
1.68  
1.76  
1.83  
1.91  
2.00  
2.09  
2.18  
2.27  
2.37  
2.47  
2.57  
2.68  
2.80  
2.91  
3.03  
1319  
1378  
1439  
1503  
1569  
1638  
1710  
1785  
1863  
1944  
2029  
2116  
2207  
2302  
2399  
2501  
2607  
2716  
2828  
967  
969  
1.59  
1.65  
1.72  
1.79  
1.87  
1.95  
2.03  
2.11  
2.20  
2.29  
2.38  
2.48  
2.58  
2.69  
2.80  
2.91  
3.03  
3.15  
3.27  
1479  
1541  
1606  
1673  
1742  
1815  
1891  
1969  
2051  
2135  
2223  
2314  
2409  
2507  
2608  
2713  
2822  
2935  
3052  
1017  
1018  
1021  
1023  
1026  
1029  
1033  
1037  
1041  
1046  
1051  
1056  
1062  
1068  
1074  
1080  
1087  
1094  
1101  
1.76  
1.83  
1.90  
1.98  
2.06  
2.14  
2.23  
2.31  
2.40  
2.50  
2.60  
2.70  
2.80  
2.91  
3.03  
3.14  
3.26  
3.39  
3.52  
1642  
1708  
1776  
1847  
1920  
1996  
2075  
2157  
2242  
2331  
2422  
2516  
2615  
2716  
2821  
2930  
3042  
3159  
3279  
972  
975  
978  
982  
986  
991  
996  
1001  
1007  
1012  
1019  
1025  
1032  
1038  
1046  
1053  
1061  
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 4.20.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—34—  
Table 26 — Fan Performance 551B120 — Horizontal Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
523  
536  
549  
562  
575  
588  
601  
614  
628  
641  
655  
668  
682  
696  
710  
723  
737  
751  
765  
779  
793  
0.58  
0.63  
0.68  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.15  
1.23  
1.31  
1.40  
1.49  
1.59  
1.69  
1.80  
1.91  
2.02  
2.14  
2.26  
541  
587  
592  
603  
614  
626  
637  
649  
661  
673  
685  
697  
709  
722  
734  
747  
760  
773  
785  
798  
812  
825  
838  
0.73  
0.78  
0.84  
0.90  
0.96  
1.03  
1.10  
1.17  
1.25  
1.33  
1.42  
1.51  
1.60  
1.70  
1.80  
1.90  
2.01  
2.13  
2.25  
2.37  
2.50  
680  
730  
657  
666  
676  
686  
696  
707  
717  
728  
739  
750  
761  
773  
784  
796  
808  
820  
832  
844  
856  
869  
881  
0.88  
0.94  
1.00  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.80  
1.91  
2.01  
2.12  
2.24  
2.35  
2.48  
2.61  
2.74  
825  
879  
718  
726  
735  
743  
752  
762  
771  
781  
791  
801  
812  
822  
833  
844  
855  
866  
877  
889  
900  
912  
923  
1.05  
1.11  
1.17  
1.24  
1.31  
1.39  
1.47  
1.55  
1.64  
1.72  
1.82  
1.92  
2.02  
2.12  
2.23  
2.35  
2.46  
2.59  
2.71  
2.85  
2.98  
977  
1035  
1096  
1159  
1226  
1296  
1369  
1445  
1525  
1608  
1695  
1786  
1880  
1979  
2081  
2187  
2297  
2412  
2531  
2654  
2782  
775  
783  
790  
798  
806  
815  
823  
832  
841  
850  
860  
870  
880  
890  
900  
910  
921  
932  
942  
953  
965  
1.22  
1.28  
1.35  
1.42  
1.50  
1.58  
1.66  
1.75  
1.84  
1.93  
2.03  
2.13  
2.23  
2.34  
2.46  
2.57  
2.70  
2.82  
2.95  
3.09  
3.23  
1135  
1196  
1260  
1328  
1398  
1472  
1548  
1629  
1712  
1799  
1890  
1984  
2082  
2184  
2290  
2400  
2514  
2633  
2756  
2883  
3014  
637  
783  
936  
689  
839  
996  
744  
898  
1059  
1125  
1194  
1267  
1343  
1423  
1506  
1593  
1683  
1777  
1876  
1978  
2085  
2195  
2310  
2430  
2554  
802  
961  
864  
1026  
1095  
1167  
1243  
1322  
1405  
1492  
1582  
1677  
1775  
1877  
1984  
2095  
2210  
2330  
929  
997  
1069  
1144  
1223  
1305  
1392  
1482  
1577  
1675  
1778  
1885  
1996  
2112  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
830  
837  
843  
850  
858  
865  
873  
881  
889  
898  
907  
916  
925  
934  
944  
954  
963  
974  
984  
994  
1005  
1.39  
1.46  
1.53  
1.61  
1.69  
1.77  
1.86  
1.95  
2.04  
2.14  
2.24  
2.35  
2.45  
2.57  
2.69  
2.81  
2.93  
3.07  
3.20  
3.34  
3.49  
1298  
1363  
1431  
1502  
1576  
1653  
1733  
1816  
1904  
1995  
2089  
2187  
2289  
2395  
2504  
2618  
2736  
2858  
2985  
3116  
3251  
883  
889  
894  
901  
907  
914  
921  
928  
936  
944  
952  
960  
969  
978  
986  
996  
1005  
1014  
1024  
1034  
—
1.57  
1.65  
1.72  
1.80  
1.88  
1.97  
2.06  
2.16  
2.25  
2.35  
2.46  
2.57  
2.68  
2.80  
2.92  
3.05  
3.18  
3.31  
3.45  
3.60  
—
1466  
1534  
1606  
1680  
1758  
1838  
1922  
2010  
2100  
2195  
2293  
2395  
2500  
2610  
2723  
2840  
2962  
3088  
3219  
3353  
—
934  
938  
944  
949  
955  
961  
967  
974  
981  
988  
996  
1004  
1011  
1020  
1028  
1037  
1045  
1054  
—
1.76  
1.83  
1.91  
2.00  
2.09  
2.18  
2.27  
2.37  
2.47  
2.57  
2.68  
2.80  
2.91  
3.03  
3.16  
3.29  
3.42  
3.56  
—
1638  
1710  
1785  
1863  
1944  
2029  
2116  
2207  
2302  
2399  
2501  
2607  
2716  
2828  
2946  
3067  
3192  
3322  
—
982  
986  
1.95  
2.03  
2.11  
2.20  
2.29  
2.38  
2.48  
2.58  
2.69  
2.80  
2.91  
3.03  
3.15  
3.27  
3.40  
3.54  
3.67  
—
1815  
1891  
1969  
2051  
2135  
2223  
2314  
2409  
2507  
2608  
2713  
2822  
2935  
3052  
3173  
3297  
3426  
—
1029  
1033  
1037  
1041  
1046  
1051  
1056  
1062  
1068  
1074  
1080  
1087  
1094  
1101  
1108  
—
2.14  
2.23  
2.31  
2.40  
2.50  
2.60  
2.70  
2.80  
2.91  
3.03  
3.14  
3.26  
3.39  
3.52  
3.65  
—
1996  
2075  
2157  
2242  
2331  
2422  
2516  
2615  
2716  
2821  
2930  
3042  
3159  
3279  
3403  
—
991  
996  
1001  
1007  
1012  
1019  
1025  
1032  
1038  
1046  
1053  
1061  
1068  
1076  
1085  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 3.70.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 860 to 1080 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—35—  
Table 27 — Fan Performance 551B120 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
523  
536  
549  
562  
575  
588  
601  
614  
628  
641  
655  
668  
682  
696  
710  
723  
737  
751  
765  
779  
793  
0.58  
0.63  
0.68  
0.74  
0.80  
0.86  
0.93  
1.00  
1.07  
1.15  
1.23  
1.31  
1.40  
1.49  
1.59  
1.69  
1.80  
1.91  
2.02  
2.14  
2.26  
541  
587  
592  
603  
614  
626  
637  
649  
661  
673  
685  
697  
709  
722  
734  
747  
760  
773  
785  
798  
812  
825  
838  
0.73  
0.78  
0.84  
0.90  
0.96  
1.03  
1.10  
1.17  
1.25  
1.33  
1.42  
1.51  
1.60  
1.70  
1.80  
1.90  
2.01  
2.13  
2.25  
2.37  
2.50  
680  
730  
657  
666  
676  
686  
696  
707  
717  
728  
739  
750  
761  
773  
784  
796  
808  
820  
832  
844  
856  
869  
881  
0.88  
0.94  
1.00  
1.07  
1.14  
1.21  
1.28  
1.36  
1.44  
1.53  
1.61  
1.71  
1.80  
1.91  
2.01  
2.12  
2.24  
2.35  
2.48  
2.61  
2.74  
825  
879  
718  
726  
735  
743  
752  
762  
771  
781  
791  
801  
812  
822  
833  
844  
855  
866  
877  
889  
900  
912  
923  
1.05  
1.11  
1.17  
1.24  
1.31  
1.39  
1.47  
1.55  
1.64  
1.72  
1.82  
1.92  
2.02  
2.12  
2.23  
2.35  
2.46  
2.59  
2.71  
2.85  
2.98  
977  
1035  
1096  
1159  
1226  
1296  
1369  
1445  
1525  
1608  
1695  
1786  
1880  
1979  
2081  
2187  
2297  
2412  
2531  
2654  
2782  
775  
783  
790  
798  
806  
815  
823  
832  
841  
850  
860  
870  
880  
890  
900  
910  
921  
932  
942  
953  
965  
1.22  
1.28  
1.35  
1.42  
1.50  
1.58  
1.66  
1.75  
1.84  
1.93  
2.03  
2.13  
2.23  
2.34  
2.46  
2.57  
2.70  
2.82  
2.95  
3.09  
3.23  
1135  
1196  
1260  
1328  
1398  
1472  
1548  
1629  
1712  
1799  
1890  
1984  
2082  
2184  
2290  
2400  
2514  
2633  
2756  
2883  
3014  
637  
783  
936  
689  
839  
996  
744  
898  
1059  
1125  
1194  
1267  
1343  
1423  
1506  
1593  
1683  
1777  
1876  
1978  
2085  
2195  
2310  
2430  
2554  
802  
961  
864  
1026  
1095  
1167  
1243  
1322  
1405  
1492  
1582  
1677  
1775  
1877  
1984  
2095  
2210  
2330  
929  
997  
1069  
1144  
1223  
1305  
1392  
1482  
1577  
1675  
1778  
1885  
1996  
2112  
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3000  
3100  
3200  
3300  
3400  
3500  
3600  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
830  
837  
843  
850  
858  
865  
873  
881  
889  
898  
907  
916  
925  
934  
944  
954  
963  
974  
984  
994  
1005  
1.39  
1.46  
1.53  
1.61  
1.69  
1.77  
1.86  
1.95  
2.04  
2.14  
2.24  
2.35  
2.45  
2.57  
2.69  
2.81  
2.93  
3.07  
3.20  
3.34  
3.49  
1298  
1363  
1431  
1502  
1576  
1653  
1733  
1816  
1904  
1995  
2089  
2187  
2289  
2395  
2504  
2618  
2736  
2858  
2985  
3116  
3251  
883  
889  
894  
901  
907  
914  
921  
928  
936  
944  
952  
960  
969  
978  
986  
996  
1005  
1014  
1024  
1034  
1044  
1.57  
1.65  
1.72  
1.80  
1.88  
1.97  
2.06  
2.16  
2.25  
2.35  
2.46  
2.57  
2.68  
2.80  
2.92  
3.05  
3.18  
3.31  
3.45  
3.60  
3.74  
1466  
1534  
1606  
1680  
1758  
1838  
1922  
2010  
2100  
2195  
2293  
2395  
2500  
2610  
2723  
2840  
2962  
3088  
3219  
3353  
3492  
934  
938  
1.76  
1.83  
1.91  
2.00  
2.09  
2.18  
2.27  
2.37  
2.47  
2.57  
2.68  
2.80  
2.91  
3.03  
3.16  
3.29  
3.42  
3.56  
3.71  
3.85  
4.01  
1638  
1710  
1785  
1863  
1944  
2029  
2116  
2207  
2302  
2399  
2501  
2607  
2716  
2828  
2946  
3067  
3192  
3322  
3456  
3594  
3737  
982  
986  
1.95  
2.03  
2.11  
2.20  
2.29  
2.38  
2.48  
2.58  
2.69  
2.80  
2.91  
3.03  
3.15  
3.27  
3.40  
3.54  
3.67  
3.82  
3.96  
4.12  
4.27  
1815  
1891  
1969  
2051  
2135  
2223  
2314  
2409  
2507  
2608  
2713  
2822  
2935  
3052  
3173  
3297  
3426  
3560  
3697  
3839  
3986  
1029  
1033  
1037  
1041  
1046  
1051  
1056  
1062  
1068  
1074  
1080  
1087  
1094  
1101  
1108  
1115  
1123  
1131  
1139  
1148  
1156  
2.14  
2.23  
2.31  
2.40  
2.50  
2.60  
2.70  
2.80  
2.91  
3.03  
3.14  
3.26  
3.39  
3.52  
3.65  
3.79  
3.93  
4.08  
4.23  
4.38  
4.55  
1996  
2075  
2157  
2242  
2331  
2422  
2516  
2615  
2716  
2821  
2930  
3042  
3159  
3279  
3403  
3531  
3664  
3801  
3943  
4088  
4238  
944  
991  
949  
996  
955  
1001  
1007  
1012  
1019  
1025  
1032  
1038  
1046  
1053  
1061  
1068  
1076  
1085  
1093  
1102  
1111  
1119  
961  
967  
974  
981  
988  
996  
1004  
1011  
1020  
1028  
1037  
1045  
1054  
1063  
1073  
1082  
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 5.25.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 830 to 1130 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—36—  
Table 28 — Fan Performance 551B150 — Horizontal Discharge Units; Standard Motor (Belt Drive)*  
EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
CFM  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Bhp  
Watts  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
5100  
5200  
5300  
5400  
5500  
5600  
5700  
5800  
5900  
6000  
6100  
6200  
6300  
614  
628  
641  
655  
668  
682  
696  
710  
723  
737  
751  
765  
779  
793  
807  
821  
835  
850  
864  
878  
892  
907  
921  
935  
949  
964  
978  
1.00  
1.07  
1.15  
1.23  
1.31  
1.40  
1.49  
1.59  
1.69  
1.80  
1.91  
2.02  
2.14  
2.26  
2.39  
2.53  
2.67  
2.81  
2.96  
3.12  
3.28  
3.44  
3.61  
3.79  
3.98  
4.16  
4.36  
929  
997  
673  
685  
697  
709  
722  
734  
747  
760  
773  
785  
798  
812  
825  
838  
851  
864  
878  
891  
905  
918  
932  
945  
959  
973  
987  
1000  
1014  
1.17  
1.25  
1.33  
1.42  
1.51  
1.60  
1.70  
1.80  
1.90  
2.01  
2.13  
2.25  
2.37  
2.50  
2.63  
2.77  
2.91  
3.06  
3.22  
3.38  
3.54  
3.71  
3.89  
4.07  
4.26  
4.45  
4.65  
1095  
1167  
1243  
1322  
1405  
1492  
1582  
1677  
1775  
1877  
1984  
2095  
2210  
2330  
2455  
2584  
2718  
2856  
3000  
3148  
3302  
3461  
3626  
3795  
3970  
4151  
4337  
728  
739  
750  
761  
773  
784  
796  
808  
820  
832  
844  
856  
869  
881  
894  
906  
919  
932  
945  
958  
971  
984  
997  
1010  
1023  
1036  
1050  
1.36  
1.44  
1.53  
1.61  
1.71  
1.80  
1.91  
2.01  
2.12  
2.24  
2.35  
2.48  
2.61  
2.74  
2.88  
3.02  
3.17  
3.32  
3.48  
3.64  
3.81  
3.99  
4.17  
4.35  
4.54  
4.74  
4.95  
1267  
1343  
1423  
1506  
1593  
1683  
1777  
1876  
1978  
2085  
2195  
2310  
2430  
2554  
2682  
2815  
2953  
3096  
3242  
3396  
3554  
3716  
3885  
4059  
4238  
4422  
4613  
781  
791  
801  
812  
822  
833  
844  
855  
866  
877  
889  
900  
912  
923  
935  
947  
959  
971  
984  
996  
1008  
1021  
1033  
1046  
1059  
1071  
1084  
1.55  
1.64  
1.72  
1.82  
1.92  
2.02  
2.12  
2.23  
2.35  
2.46  
2.59  
2.71  
2.85  
2.98  
3.13  
3.27  
3.42  
3.58  
3.74  
3.91  
4.09  
4.26  
4.45  
4.64  
4.84  
5.04  
5.25  
1445  
1525  
1608  
1695  
1786  
1880  
1979  
2081  
2187  
2297  
2412  
2531  
2654  
2782  
2914  
3050  
3193  
3339  
3491  
3648  
3810  
3976  
4149  
4326  
4510  
4698  
4892  
832  
841  
850  
860  
870  
880  
890  
900  
910  
921  
932  
942  
953  
965  
976  
987  
999  
1010  
1022  
1034  
1045  
1057  
1069  
1082  
1094  
—
1.75  
1.84  
1.93  
2.03  
2.13  
2.23  
2.34  
2.46  
2.57  
2.70  
2.82  
2.95  
3.09  
3.23  
3.38  
3.53  
3.69  
3.85  
4.01  
4.19  
4.36  
4.55  
4.74  
4.93  
5.13  
—
1629  
1712  
1799  
1890  
1984  
2082  
2184  
2290  
2400  
2514  
2633  
2756  
2883  
3014  
3150  
3292  
3437  
3588  
3743  
3903  
4069  
4240  
4416  
4598  
4785  
—
1069  
1144  
1223  
1305  
1392  
1482  
1577  
1675  
1778  
1885  
1996  
2112  
2232  
2357  
2487  
2622  
2762  
2906  
3055  
3211  
3370  
3536  
3707  
3883  
4066  
—
—
—
EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
CFM  
1.2  
Bhp  
1.4  
Bhp  
1.8  
Bhp  
2.0  
Bhp  
Rpm  
Watts  
Rpm  
Watts  
Rpm  
Bhp  
Watts  
Rpm  
Watts  
Rpm  
Watts  
3700  
3800  
3900  
4000  
4100  
4200  
4300  
4400  
4500  
4600  
4700  
4800  
4900  
5000  
5100  
5200  
5300  
5400  
5500  
5600  
5700  
5800  
5900  
6000  
6100  
6200  
6300  
881  
889  
1.95  
2.04  
2.14  
2.24  
2.35  
2.45  
2.57  
2.69  
2.81  
2.93  
3.07  
3.20  
3.34  
3.49  
3.64  
3.79  
3.95  
4.12  
4.29  
4.46  
4.65  
4.83  
5.03  
5.23  
—
1816  
1904  
1995  
2089  
2187  
2289  
2395  
2504  
2618  
2736  
2858  
2985  
3116  
3251  
3391  
3536  
3685  
3840  
3999  
4163  
4333  
4508  
4688  
4873  
—
928  
936  
944  
952  
960  
969  
978  
986  
996  
1005  
1014  
1024  
1034  
1044  
1054  
1064  
1075  
1085  
1096  
1106  
1117  
1128  
—
2.16  
2.25  
2.35  
2.46  
2.57  
2.68  
2.80  
2.92  
3.05  
3.18  
3.31  
3.45  
3.60  
3.74  
3.90  
4.06  
4.22  
4.39  
4.57  
4.75  
4.93  
5.13  
—
2010  
2100  
2195  
2293  
2395  
2500  
2610  
2723  
2840  
2962  
3088  
3219  
3353  
3492  
3636  
3784  
3938  
4096  
4259  
4427  
4601  
4779  
—
974  
981  
2.37  
2.47  
2.57  
2.68  
2.80  
2.91  
3.03  
3.16  
3.29  
3.42  
3.56  
3.71  
3.85  
4.01  
4.17  
4.33  
4.50  
4.67  
4.85  
5.03  
5.22  
—
2207  
2302  
2399  
2501  
2607  
2716  
2828  
2946  
3067  
3192  
3322  
3456  
3594  
3737  
3885  
4037  
4194  
4356  
4523  
4695  
4872  
—
1019  
1025  
1032  
1038  
1046  
1053  
1061  
1068  
1076  
1085  
1093  
1102  
1111  
1119  
1129  
1138  
1147  
1157  
1167  
—
2.58  
2.69  
2.80  
2.91  
3.03  
3.15  
3.27  
3.40  
3.54  
3.67  
3.82  
3.96  
4.12  
4.27  
4.44  
4.60  
4.78  
4.95  
5.14  
—
2409  
2507  
2608  
2713  
2822  
2935  
3052  
3173  
3297  
3426  
3560  
3697  
3839  
3986  
4137  
4293  
4454  
4619  
4790  
—
1062  
1068  
1074  
1080  
1087  
1094  
1101  
1108  
1115  
1123  
1131  
1139  
1148  
1156  
1165  
1174  
1183  
1192  
—
2.80  
2.91  
3.03  
3.14  
3.26  
3.39  
3.52  
3.65  
3.79  
3.93  
4.08  
4.23  
4.38  
4.55  
4.71  
4.88  
5.06  
5.24  
—
2615  
2716  
2821  
2930  
3042  
3159  
3279  
3403  
3531  
3664  
3801  
3943  
4088  
4238  
4393  
4553  
4718  
4886  
—
898  
988  
907  
996  
916  
1004  
1011  
1020  
1028  
1037  
1045  
1054  
1063  
1073  
1082  
1092  
1101  
1111  
1121  
1132  
1142  
1152  
—
925  
934  
944  
954  
963  
974  
984  
994  
1005  
1015  
1026  
1037  
1048  
1059  
1070  
1082  
1093  
1105  
1116  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
NOTES:  
1. Boldface indicates field-supplied drive is required.  
2. Maximum continuous bhp is 5.25.  
Bhp  
— Brake Horsepower Input to Fan  
Watts — Input Watts to Motor  
*Motor drive range: 830 to 1130 rpm. All other rpms require field-  
supplied drive.  
3. See page 23 for general fan performance notes.  
—37—  
PRE-START-UP  
d. Make sure that all tools and miscellaneous loose  
parts have been removed.  
e. Make sure that the start-up checklist has been  
performed and filled out.  
WARNING: Failure to observe the following warn-  
ings could result in serious personal injury:  
1. Follow recognized safety practices and wear  
protective goggles when checking or servicing  
refrigerant system.  
NOTE: Ensure wiring does not contact any refrigerant  
tubing.  
2. Do not operate compressor or provide any elec-  
tric power to unit unless compressor terminal  
cover is in place and secured.  
START-UP  
I. UNIT PREPARATION  
Make sure that unit has been installed in accordance with  
these installation instructions and applicable codes.  
3. Do not remove compressor terminal cover until  
all electrical sources are disconnected and prop-  
erly tagged.  
II. RETURN-AIR FILTERS  
4. Relieve all pressure from system before touch-  
ing or disturbing anything inside terminal box  
if refrigerant leak is suspected around compres-  
sor terminals. Use accepted methods to recover  
refrigerant.  
Make sure correct filters are installed in unit (see Table 1).  
Do not operate unit without return-air filters.  
III. OUTDOOR-AIR INLET SCREENS  
Outdoor-air inlet screens must be in place before operating  
unit.  
5. Never attempt to repair soldered connection  
while refrigerant system is under pressure.  
IV. COMPRESSOR MOUNTING  
6. Do not use torch to remove any component. Sys-  
tem contains oil and refrigerant under pres-  
sure. To remove a component, wear protective  
goggles and proceed as follows:  
Compressors are internally spring mounted. Do not loosen or  
remove compressor holddown bolts.  
V. INTERNAL WIRING  
a. Shut off electrical power to unit and install  
lockout tag.  
Check all electrical connections in unit control boxes; tighten  
as required.  
b. Relieve all pressure from system using  
both high and low-pressure ports. Use  
accepted methods to recover refrigerant.  
c. Cut component connection tubing with tub-  
ing cutter and remove component from  
unit.  
VI. REFRIGERANT SERVICE PORTS  
Each refrigerant system has 4 Schrader-type service gage  
ports: one on the suction line, one on the liquid line, and 2 on  
the compressor discharge line. Be sure that caps on the ports  
are tight.  
d. Carefully unsweat remaining tubing stubs  
when necessary. Oil can ignite when  
exposed to torch flame.  
VII. HIGH FLOW VALVES  
Two high flow refrigerant valves are located on the compres-  
sor hot gas and suction tubes. Large black plastic caps dis-  
tinguish these valves with o-rings located inside the caps.  
These valves can not be accessed for service in the field.  
Ensure the plastic caps are in place and tight or the possibil-  
ity of refrigerant leakage could occur.  
Proceed as follows to inspect and prepare the unit for initial  
start-up:  
1. Remove all access panels.  
2. Read and follow instructions on all WARNING, CAU-  
TION, and INFORMATION labels attached to or  
shipped with unit.  
VIII. COMPRESSOR ROTATION  
On 3-phase units, it is important to be certain the scroll  
compressor is rotating in the proper direction. To determine  
whether or not compressor is rotating in the proper direction:  
3. Make the following inspections:  
a. Inspect for shipping and handling damages such  
as broken lines, loose parts, or disconnected  
wires.  
1. Connect service gages to suction and discharge pres-  
sure fittings.  
2. Energize the compressor.  
b. Inspect for oil at all refrigerant tubing connec-  
tions and on unit base. Detecting oil generally  
indicates a refrigerant leak. Leak-test all refrig-  
erant tubing connections using electronic leak  
detector, halide torch, or liquid-soap solution.  
c. Inspect all field-wiring and factory-wiring con-  
nections. Be sure that connections are completed  
and tight.  
3. The suction pressure should drop and the discharge  
pressure should rise, as is normal on any start-up.  
If the suction pressure does not drop and the discharge pres-  
sure does not rise to normal levels:  
1. Note that the evaporator fan is probably also rotating  
in the wrong direction.  
d. Inspect coil fins. If damaged during shipping and  
handling, carefully straighten fins with a fin  
comb.  
2. Turn off power to the unit and install lockout tag.  
3. Reverse any two of the unit power leads.  
4. Turn on power to the unit.  
4. Verify the following:  
The suction and discharge pressure levels should now move  
to their normal start-up levels.  
a. Make sure that condenser-fan blades are  
correctly positioned in fan orifice. Refer to  
Condenser-Fan Adjustment section on page 42  
for more details.  
b. Make sure that air filters are in place.  
c. Make sure that condensate drain trap is filled  
with water to ensure proper drainage.  
NOTE: When the compressor is rotating in the wrong direc-  
tion, the unit makes an elevated level of noise and does not  
provide heating or cooling.  
CAUTION: Compressor damage will occur if rota-  
tion is not immediately corrected.  
—38—  
IX. COOLING  
C. Cooling, Units With EconoMi$er IV  
To start unit, turn on main power supply. Set system selector  
switch at COOL position and fan switch at AUTO position.  
Adjust thermostat to a setting below room temperature.  
Compressor starts on closure of contactor.  
When free cooling is not available, the compressors will be  
controlled by the zone thermostat. When free cooling is avail-  
able, the outdoor-air damper is modulated by the  
EconoMi$er IV control to provide a 50 to 55 F supply-air  
temperature into the zone. As the supply-air temperature  
fluctuates above 55 or below 50 F, the dampers will be modu-  
lated (open or close) to bring the supply-air temperature  
back within the set point limits.  
Check unit charge. Refer to Refrigerant Charge section on  
page 42.  
Reset thermostat at a position above room temperature.  
Compressor will shut off.  
For EconoMi$er IV operation, there must be a thermostat  
call for the fan (G). This will move the damper to its mini-  
mum position during the occupied mode.  
To Shut Off Unit  
Set system selector switch at OFF position. Resetting ther-  
mostat at a position above room temperature shuts unit off  
temporarily until space temperature exceeds thermostat set-  
ting. Units are equipped with Cycle-LOC™ protection  
device. Unit shuts down on any safety trip and remains off;  
an indicator light on the thermostat comes on. Check reason  
for safety trip.  
Above 50 F supply-air temperature, the dampers will modu-  
late from 100% open to the minimum open position. From  
50 F to 45 F supply-air temperature, the dampers will main-  
tain at the minimum open position. Below 45 F the dampers  
will be completely shut. As the supply-air temperature rises,  
the dampers will come back open to the minimum open posi-  
tion once the supply air temperature rises to 48 F.  
Compressor restart is accomplished by manual reset at the  
thermostat by turning the selector switch to OFF position  
and then ON position.  
If optional power exhaust is installed, as the outdoor-air  
damper opens and closes, the power exhaust fans will be  
energized and deenergized.  
X. HEATING (IF ACCESSORY HEATER IS INSTALLED)  
If field-installed accessory CO2 sensors are connected to the  
EconoMi$er IV control, a demand controlled ventilation  
strategy will begin to operate. As the CO2 level in the zone  
increases above the CO2 set point, the minimum position of  
the damper will be increased proportionally. As the CO2 level  
decreases because of the increase in fresh air, the outdoor-air  
damper will be proportionally closed. Damper position will  
follow the higher demand condition from DCV mode or free  
cooling mode.  
To start unit, turn on main power supply.  
Set thermostat at HEAT position and a setting above room  
temperature, and set fan at AUTO position.  
First stage of thermostat energizes the first-stage electric  
heater elements; second stage energizes second-stage electric  
heater elements. Check heating effects at air supply grille(s).  
If accessory electric heaters do not energize, reset limit  
switch (located on evaporator-fan scroll) by pressing button  
located between terminals on the switch.  
Damper movement from full closed to full open (or vice  
versa) will take between 11/2 and 21/2 minutes.  
To Shut Off Unit  
If free cooling can be used as determined from the appropri-  
ate changeover command (switch, dry bulb, enthalpy curve,  
differential dry bulb, or differential enthalpy), a call for cool-  
ing (Y1 closes at the thermostat) will cause the control to  
modulate the dampers open to maintain the supply air tem-  
perature set point at 50 to 55 F.  
Set system selector switch at OFF position. Resetting heating  
selector lever below room temperature temporarily shuts unit  
off until space temperature falls below thermostat setting.  
XI. SAFETY RELIEF  
A soft solder joint in the suction line at the loss-of-charge/  
low-pressure switch fitting provides pressure relief under  
abnormal temperature and pressure conditions.  
As the supply-air temperature drops below the set point  
range of 50 to 55 F, the control will modulate the outdoor-  
air dampers closed to maintain the proper supply-air  
temperature.  
XII. VENTILATION (CONTINUOUS FAN)  
Set fan and system selector switches at ON and OFF posi-  
tions, respectively. Evaporator fan operates continuously to  
provide constant air circulation.  
D. Heating, Units with EconoMi$er IV  
Upon a call for heating through terminal W1, IFC and  
heater contactor no. 1 (HC1) are energized. On units  
equipped for 2 stages of heat, when additional heat is  
needed, HC2 is energized through W2. The economizer  
damper moves to the minimum position. When the thermo-  
stat is satisfied, the damper moves to the fully closed  
position.  
XIII. OPERATING SEQUENCE  
A. Cooling, Units Without EconoMi$er IV  
When the thermostat calls for cooling, terminals G and Y1  
are energized. The indoor (evaporator) fan contactor (IFC),  
outdoor (condenser) fan contactor (OFC), and compressor  
contactor no. 1 (C1) are energized and the evaporator-fan  
motor, compressor no. 1, and condenser fans start. The  
condenser-fan motors run continuously while unit is in cool-  
ing. If the thermostat calls for a second stage of cooling by  
energizing Y2, compressor contactor no. 2 (C2) is energized  
and compressor no. 2 starts.  
E. Units With Perfect Humidity™ Dehumidification System  
Normal Design Cooling Operation  
When the rooftop operates under the normal sequence of  
operation, the compressors will cycle to maintain indoor con-  
ditions. See Fig. 40.  
The Perfect Humidity dehumidification system includes a  
factory-installed Motormaster® low ambient control to keep  
the head and suction pressure high, allowing normal design  
cooling mode operation down to 0° F.  
B. Heating, Units Without EconoMi$er IV (If Accessory  
Heater is Installed)  
Upon a call for heating through terminal W1, IFC and  
heater contactor no. 1 (HC1) are energized. On units  
equipped for 2 stages of heat, when additional heat is  
needed, HC2 is energized through W2.  
—39—  
Fig. 40 — Perfect Humidity™ System  
Normal Design Cooling Operation  
Fig. 41 — Perfect Humidity System  
Subcooling Mode Operation  
Subcooling Mode  
will be cooled and dehumidified, but will be warmed to neu-  
tral conditions (72 F to 75 F) by the subcooling/reheat dehu-  
midification coil.  
When subcooling mode is initiated, this will energize (close)  
the liquid line solenoid valve (LLSV) forcing the hot liquid  
refrigerant to enter into the subcooling coil (see Fig. 41).  
NOTE: The 551B090-150 rooftop units can operate one cir-  
cuit in subcooling mode and one circuit in hot gas reheat  
mode or both circuits in hot gas reheat mode, or both in nor-  
mal design cooling mode.  
As the hot liquid refrigerant passes through the subcooling/  
reheat dehumidification coil, it is exposed to the cold supply  
airflow coming through the evaporator coil. The liquid is fur-  
ther subcooled to a temperature approaching the evaporator  
leaving-air temperature. The liquid then enters a thermo-  
static expansion valve (TXV) where the liquid drops to a  
lower pressure. The TXV does not have a pressure drop great  
enough to change the liquid to a 2-phase fluid, so the liquid  
then enters the Acutrol™ device at the evaporator coil.  
The net effect of the rooftop when in hot gas reheat mode is  
to provide nearly all latent capacity removal from the space  
when sensible loads diminish (when outdoor temperature  
conditions are moderate). When in hot gas reheat mode, the  
unit will operate to provide mostly latent capacity and  
extremely low sensible heat ratio capability.  
The liquid enters the evaporator coil at a temperature lower  
than in standard cooling operation. This lower temperature  
increases the latent capacity of the rooftop unit. The refriger-  
ant passes through the evaporator and is turned into a  
vapor. The air passing over the evaporator coil will become  
colder than during normal operation. However, as this same  
air passes over the subcooling coil, it will be slightly warmed,  
partially reheating the air.  
Similar to the subcooling mode of operation, hot gas reheat  
mode operates only when the outside air temperature is  
warmer than 40 F. Below this temperature, a factory-installed  
outside air temperature switch will lock out this mode of  
operation.  
See Table 29 for the Perfect Humidity dehumidification sys-  
tem sequence of operation.  
Subcooling mode operates only when the outside-air temper-  
ature is warmer than 40 F. A factory-installed temperature  
switch located in the condenser section will lock out subcool-  
ing mode when the outside temperature is cooler than 40 F.  
The scroll compressors are equipped with crankcase heaters  
to provide protection for the compressors due to the addi-  
tional refrigerant charge required by the subcooling/reheat  
coil.  
When in subcooling mode, there is a slight decrease in sys-  
tem total gross capacity (5% less), a lower gross sensible  
capacity (20% less), and a greatly increased latent capacity  
(up to 40% more).  
Hot Gas Reheat Mode  
When the humidity levels in the space require humidity con-  
trol, a hot gas solenoid valve (specific to hot gas reheat mode  
only) will open to bypass a portion of hot gas refrigerant  
around the condenser coil (see Fig. 42).  
This hot gas will mix with liquid refrigerant leaving the con-  
denser coil and flow to the subcooling/reheat dehumidifica-  
tion coil. Now the conditioned air coming off the evaporator  
Fig. 42 — Perfect Humidity System  
Hot Gas Reheat Mode Operation  
—40—  
Table 29 — Perfect Humidity™ Dehumidification System Sequence of Operation  
and System Response — Dual Compressor Units  
551B UNIT OPERATION  
ECONOMIZER FUNCTION  
THERMOSTAT  
INPUT  
First Stage  
Second Stage  
OAT < Economizer  
Set Point  
Compressor Subcooling  
Hot Gas  
Reheat Mode  
Compressor Subcooling  
Hot Gas  
Reheat Mode  
H
Y1  
Y2  
Economizer  
1
Mode  
2
Mode  
Off  
On  
On  
On  
On  
On  
—
—
Unit Operates Under Normal Sequence of Operation  
On  
On  
On  
On  
Off  
On  
Off  
On  
Off  
Off  
No  
No  
Yes  
Yes  
No  
Off  
Off  
On  
On  
Off  
On  
On  
On  
On  
On  
Yes  
Yes  
Yes  
No  
No  
No  
No  
Yes  
Yes  
On  
On  
On  
On  
On  
Yes  
No  
No  
No  
No  
No  
Yes  
Yes  
Yes  
Yes  
No  
LEGEND  
— Outdoor Air Temperature  
OAT  
NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.  
F. Units With Power Exhaust  
3. Remove condenser coil corner post. See Fig. 43. To  
hold top panel open, place coil corner post between  
top panel and center post. See Fig. 44.  
4. Remove device holding coil sections together at  
return end of condenser coil. Carefully separate the  
outer coil section 3 to 4 in. from the inner coil section.  
See Fig. 45.  
5. Use a water hose or other suitable equipment to flush  
down between the 2 coil sections to remove dirt and  
debris. Clean the outer surfaces with a stiff brush in  
the normal manner.  
6. Secure the sections together. Reposition the coil sec-  
tions, and remove the coil corner post from between  
the top panel and center post. Install the coil corner  
post and coil center post, and replace all screws.  
When the outdoor-air damper is modulated open, the two  
end switches located in the actuator are tripped. The factory  
settings are: switch no. 1 will close at 30% outdoor air;  
switch no. 2 will close at 70% outdoor-air. Both switches are  
field adjustable. As the outdoor-air damper opens, switch no.  
1 closes, energizing a double-pole relay that starts fan no. 1.  
As the outdoor-air damper continues to open, switch no. 2  
will close, energizing a double-pole relay that starts fan no.  
2. When the outdoor-air damper closes to a point below the  
fan start points (30% fan no. 1, 70% fan no. 2), the respective  
fan will be deenergized.  
SERVICE  
CAUTION: When servicing unit, shut off all elec-  
trical power to unit to avoid shock hazard or injury  
from rotating parts.  
I. CLEANING  
Inspect unit interior at the beginning of each heating and  
cooling season or as operating conditions require.  
A. Evaporator Coil  
1. Turn unit power off and install lockout tag. Remove  
evaporator coil access panel.  
2. If EconoMi$er IV or accessory two-position damper is  
installed, remove economizer or two-position damper  
by disconnecting EconoMi$er IV plug and removing  
mounting screws.  
3. Slide filters out of unit.  
4. Clean coil using a commercial coil cleaner or dish-  
washer detergent in a pressurized spray canister.  
Wash both sides of coil and flush with clean water.  
For best results, back-flush toward return-air section  
to remove foreign material.  
Fig. 43 — Cleaning Condenser Coil  
5. Flush condensate pan after completion.  
6. Reinstall economizer or two-position damper and filters.  
7. Reconnect wiring.  
8. Replace access panels.  
B. Condenser Coils  
Inspect coils monthly. Clean condenser coils annually, and as  
required by location and outdoor-air conditions.  
Clean 2-row coils as follows:  
1. Turn off unit power and install lockout tag.  
2. Remove top panel screws on condenser end of unit.  
Fig. 44 — Propping Up Top Panel  
—41—  
V. ECONOMI$ER IV ADJUSTMENT  
Refer to Optional EconoMi$er IV section on page 13.  
VI. REFRIGERANT CHARGE  
Amount of refrigerant charge is listed on unit nameplate  
(also refer to Table 1). Refer to Bryant Standard Service  
Techniques Manual, Chapter 1, Refrigerants section.  
Unit panels must be in place when unit is operating during  
charging procedure.  
A. No Charge  
Locate and repair any refrigerant leak. Use standard evacu-  
ating techniques. After evacuating system, weigh in the  
specified amount of refrigerant (refer to Table 1).  
B. Low Charge Cooling  
Use Cooling Charging Charts, Fig. 47-50. Vary refrigerant until  
the conditions of the appropriate chart are met. Note that charg-  
ing charts are different from the type normally used. Charts are  
based on charging the units to the correct superheat for the var-  
ious operating conditions. Accurate pressure gage and tempera-  
ture sensing device are required. Connect the pressure gage to  
the service port on the suction line. Mount the temperature  
sensing device on the suction line and insulate it so that outdoor  
ambient temperature does not affect the reading. Indoor-air cfm  
must be within the normal operating range of the unit.  
Fig. 45 — Separating Coil Sections  
C. Condensate Drain  
Check and clean each year at start of cooling season. In win-  
ter, protect against freeze-up.  
D. Filters  
Clean or replace at start of each heating and cooling season,  
or more often if operating conditions require it. Replacement  
filters must be same dimensions as original filters.  
C. Perfect Humidity™ System Charging  
The system charge for units with the Perfect Humidity option is  
greater than that of the standard unit alone. The charge for  
units with this option is indicated on the unit nameplate draw-  
ing. Also refer to Fig. 51-53. To charge systems using the Perfect  
Humidity dehumidification system, fully evacuate, recover and  
recharge the system to the nameplate specified charge level.  
E. Outdoor-Air Inlet Screen  
Clean screen with steam or hot water and a mild detergent.  
Do not use throwaway filters in place of screens.  
II. LUBRICATION  
A. Compressors  
To check or adjust refrigerant charge on systems using the  
Perfect Humidity Dehumidification system, charge per  
Fig. 51-53.  
Each compressor is charged with correct amount of oil from  
the factory.  
NOTE: When using the charging charts, it is important that  
only the subcooling/reheat dehumidification coil liquid line  
solenoid valve be energized. The subcooling/reheat dehumid-  
ification coil liquid line solenoid valve MUST be energized to  
use the charging charts and the outdoor motor speed control-  
ler jumpered to run the fan at full speed.  
B. Fan Motor Bearings  
Fan motor bearings are permanently lubricated. No further  
lubrication of condenser-fan or evaporator-fan motors is  
required.  
III. CONDENSER-FAN ADJUSTMENT (FIG. 46)  
The charts reference a liquid pressure (psig) and tempera-  
ture at  
a
point between the condenser coil and the  
1. Shut off unit power supply and install lockout tag.  
2. Remove condenser-fan assembly (grille, motor, motor  
cover, and fan) and loosen fan hub setscrews.  
subcooling/reheat dehumidification coil. A tap is provided on  
the unit to measure liquid pressure entering the subcooling/  
reheat dehumidification coil.  
3. Adjust fan height as shown in Fig. 46.  
IMPORTANT: The subcooling mode charging charts  
(Fig. 51-53) are to be used ONLY with units having the  
optional Perfect Humidity dehumidification system. DO NOT  
use standard charts (Fig. 47-50) for units with Perfect Humid-  
ity option, and DO NOT use Fig. 51-53 for standard units.  
4. Tighten setscrews and replace condenser-fan assembly.  
D. To Use Cooling Charging Charts, Standard Units  
Take the outdoor ambient temperature and read the suction  
pressure gage. Refer to appropriate chart to determine what  
the suction temperature should be. If suction temperature is  
high, add refrigerant. If suction temperature is low, carefully  
recover some of the charge. Recheck the suction pressure as  
charge is adjusted.  
UNIT VOLTAGE  
208/230 v  
460 v and 575 v  
FAN HEIGHT “A” (in.)  
2.75  
3.50  
Fig. 46 — Condenser-Fan Adjustment  
EXAMPLE (Fig. 47):  
Circuit 1  
IV. BELT/PULLEY ADJUSTMENT  
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F  
Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 psig  
Suction Temperature should be . . . . . . . . . . . . . . . . . . 46 F  
(Suction Temperature may vary ±5° F.)  
Inspect once each season or sooner if conditions warrant,  
verifying that belt tension and pulley alignment are correct.  
Replace belt if required.  
—42—  
Fig. 47 — Cooling Charging Charts, Standard 551B090 Unit  
Fig. 48 — Cooling Charging Charts, Standard 551B102 Unit  
—43—  
Fig. 49 — Cooling Charging Charts, Standard 551B120 Unit  
Fig. 50 — Cooling Charging Charts, Standard 551B150 Unit  
—44—  
E. To Use Cooling Charging Charts, Units the Perfect  
Humidity™ Dehumidification System  
Refer to the charts (Fig. 51-53) to determine the proper leav-  
ing condenser pressure and temperature.  
EXAMPLE: (Fig. 51)  
Circuit 1  
Leaving Condenser Pressure . . . . . . . . . . . . . . . . . . . 300 psig  
Leaving Condenser Temperature . . . . . . . . . . . . . . . . . .117 F  
NOTE: When using the charging charts, it is important that  
only the subcooling/reheat dehumidification coil liquid line  
solenoid valve be energized. The subcooling/reheat dehumid-  
ification coil liquid line solenoid valve MUST be energized to  
use the charging charts and the outdoor motor speed control-  
ler jumpered to run the fan at full speed.  
VII. REPLACEMENT PARTS  
A complete list of replacement parts may be obtained from  
any Bryant distributor upon request.  
NOTE: When using the charging charts, it is important that only the subcooling/  
reheat dehumidification coil liquid line solenoid valve be energized. The subcool-  
ing/reheat dehumidification coil liquid line solenoid valve MUST be energized to  
use the charging charts and the outdoor motor speed controller jumpered to run  
the fan at full speed.  
Fig. 52 — Cooling Charging Chart, 581B102 and 120  
With the Perfect Humidity Dehumidification System  
NOTE: When using the charging charts, it is important that only the subcooling/  
reheat dehumidification coil liquid line solenoid valve be energized. The subcool-  
ing/reheat dehumidification coil liquid line solenoid valve MUST be energized to  
use the charging charts and the outdoor motor speed controller jumpered to run  
the fan at full speed.  
Fig. 51 — Cooling Charging Chart, 581B090  
With the Perfect Humidity Dehumidification System  
NOTE: When using the charging charts, it is important that only the subcooling/  
reheat dehumidification coil liquid line solenoid valve be energized. The subcool-  
ing/reheat dehumidification coil liquid line solenoid valve MUST be energized to  
use the charging charts and the outdoor motor speed controller jumpered to run  
the fan at full speed.  
Fig. 53 — Cooling Charging Chart, 581B150  
With the Perfect Humidity Dehumidification System  
—45—  
TROUBLESHOOTING  
I. UNIT TROUBLESHOOTING  
Refer to Tables 30-32 for additional information.  
Table 30 — Cooling Troubleshooting  
PROBLEM  
CAUSE  
REMEDY  
Compressor(s) and  
Condenser Fan  
Will Not Start.  
Power failure.  
Fuse blown or circuit breaker tripped.  
Defective thermostat, contactor, transformer,  
control relay.  
Call power company.  
Replace fuse or reset circuit breaker.  
Replace component.  
Insufficient line voltage.  
Determine cause and correct.  
Incorrect or faulty wiring.  
Check wiring diagram and rewire correctly.  
Lower thermostat setting below room temperature.  
See problem “Excessive Head Pressure.”  
Check system for leaks, repair, and recharge.  
See problem “Suction Pressure Too Low.”  
Check wiring and repair or replace.  
Thermostat setting too high.  
High pressure switch tripped.  
Low pressure switch tripped.  
Freeze-up protection thermostat tripped.  
Faulty wiring or loose connections in compressor  
circuit.  
Compressor(s) Will Not  
Start but Condenser Fan  
Runs.  
Compressor motor(s) burned out, seized, or internal  
overload open.  
Determine cause. Replace compressor(s).  
Defective overload.  
Determine cause and replace.  
One leg of 3-phase power dead.  
Refrigerant overcharge or undercharge.  
Replace fuse or reset circuit breaker. Determine cause.  
Recover refrigerant, evacuate system, and recharge  
to nameplate.  
Replace and determine cause.  
Determine cause and correct.  
Determine cause and correct.  
Determine cause and replace.  
Replace thermostat.  
Compressor(s) Cycles  
(Other Than Normally  
Satisfying Thermostat).  
Defective compressor.  
Insufficient line voltage.  
Blocked condenser.  
Defective overload.  
Defective thermostat.  
Faulty condenser-fan motor(s) or capacitor.  
Restriction in refrigerant system.  
Dirty air filter.  
Unit undersized for load.  
Thermostat set too low.  
Replace.  
Locate restriction and remove.  
Replace filter.  
Decrease load or increase unit size.  
Reset thermostat.  
Compressor(s) Operates  
Continuously.  
Low refrigerant charge.  
Leaking valves in compressor.  
Air in system.  
Condenser coil dirty or restricted.  
Compressor(s) rotating in the wrong direction.  
Locate leak, repair, and recharge.  
Replace compressor.  
Recover refrigerant, evacuate system, and recharge.  
Clean coil or remove restriction.  
Reverse the 3-phase power leads as described in  
Start-Up section, page 38.  
Scroll Compressor(s)  
Makes Excessive Noise.  
Excessive Head Pressure.  
Dirty air filter.  
Replace filter.  
Dirty condenser coil.  
Refrigerant overcharged.  
Air in system.  
Clean coil.  
Remove excess refrigerant.  
Recover refrigerant, evacuate system to 500 microns,  
and recharge.  
Condenser air restricted or air short-cycling.  
Low refrigerant charge.  
Compressor valves leaking.  
Restriction in liquid tube.  
High heat load.  
Compressor valves leaking.  
Refrigerant overcharged.  
Dirty air filter.  
Determine cause and correct.  
Check for leaks, repair, and recharge.  
Replace compressor(s).  
Remove restriction.  
Check for source and eliminate.  
Replace compressor(s).  
Head Pressure Too Low.  
Excessive Suction  
Pressure.  
Recover excess refrigerant.  
Replace filter.  
Suction Pressure Too Low.  
Low refrigerant charge.  
Metering device or low side restricted.  
Insufficient evaporator airflow.  
Check for leaks, repair, and recharge.  
Remove source of restriction.  
Increase air quantity. Check filter and replace if  
necessary.  
Temperature too low in conditioned area.  
Field-installed filter drier restricted.  
Outdoor ambient temperature below 25 F.  
Unit in economizer mode.  
Reset thermostat.  
Replace.  
Install low-ambient kit.  
Proper operation; no remedy necessary.  
Compressor No. 2  
Will Not Run.  
—46—  
Table 31 — Perfect Humidity™ Dehumidification System Subcooling Mode Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Subcooling Mode (Liquid Reheat)  
Will Not Energize.  
No power to control transformer from  
evaporator-fan motor.  
Check power source and evaporator-fan relay. Ensure all wire  
connections are tight.  
No power from control transformer to liquid 1. Fuse open; check fuse. Ensure continuity of wiring.  
line solenoid valve.  
2. Low-pressure switch open. Cycle unit off and allow low-  
pressure switch to reset. Replace switch if it will not close.  
3. Transformer bad; check transformer.  
Liquid line solenoid valve will not operate. 1. Solenoid coil defective; replace.  
2. Solenoid valve stuck open; replace.  
Liquid line solenoid valve will not open.  
Valve is stuck closed; replace valve.  
Low System Capacity.  
Low refrigerant charge or frosted evapora- 1. Check charge amount. Charge per Fig. 51-53.  
tor coil.  
2. Evaporator coil frosted; check and replace low-pressure  
switch if necessary.  
Loss of Compressor Superheat  
Conditions with Subcooling/Reheat  
Dehumidification Coil Energized.  
Thermostatic expansion valve (TXV).  
1. Check TXV bulb mounting, and secure tightly to suction line.  
2. Replace TXV if stuck open or closed.  
Table 32 — Perfect Humidity Dehumidification Hot Gas Reheat Mode Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Reheat Mode Will Not Energize.  
No power to control transformer from  
evaporator-fan motor.  
Check power source and evaporator-fan relay. Ensure all wire  
connections are tight.  
No power from control transformer to hot  
gas line solenoid valve.  
1. Fuse open; check fuse. Ensure continuity of wiring.  
2. Low-pressure switch open. Cycle unit off and allow low-  
pressure switch to reset. Replace switch if it will not close.  
3. Transformer bad; check transformer.  
Hot gas line solenoid valve will not operate. 1. Solenoid coil defective; replace.  
2. Solenoid valve stuck closed; replace.  
Low refrigerant charge or frosted evapora- 1. Check charge amount. Charge per Fig. 51-53.  
tor coil.  
2. Evaporator coil frosted; check and replace low-pressure  
switch if necessary.  
Loss of Compressor Superheat  
Conditions with Subcooling/Reheat  
Dehumidification Coil Energized.  
Thermostatic expansion valve (TXV).  
1. Check TXV bulb mounting, and secure tightly to suction line.  
2. Replace TXV if stuck open or closed.  
Excessive Superheat.  
Liquid line solenoid valve will not operate. Valve is stuck; replace valve.  
Hot gas line solenoid valve will not close. Valve is stuck; replace valve.  
—47—  
II. ECONOMI$ER IV TROUBLESHOOTING  
D. DCV (Demand Controlled Ventilation) and Power  
Exhaust  
See Table 33 for EconoMi$er IV logic.  
To check DCV and Power Exhaust:  
A functional view of the EconoMi$er IV is shown in Fig. 54.  
Typical settings, sensor ranges, and jumper positions are  
also shown. An EconoMi$er IV simulator program is avail-  
able from Bryant to help with EconoMi$er IV training and  
troubleshooting.  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
2. Ensure terminals AQ and AQ1 are open. The LED for  
both DCV and Exhaust should be off. The actuator  
should be fully closed.  
A. EconoMi$er IV Preparation  
3. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The LED for both DCV and Exhaust  
should turn on. The actuator should drive to between  
90 and 95% open.  
This procedure is used to prepare the EconoMi$er IV for  
troubleshooting. No troubleshooting or testing is done by  
performing the following procedure.  
NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm  
resistor, and a 5.6 kilo-ohm resistor which are not supplied  
with the EconoMi$er IV.  
4. Turn the Exhaust potentiometer CW until the  
Exhaust LED turns off. The LED should turn off  
when the potentiometer is approximately 90%. The  
actuator should remain in position.  
IMPORTANT: Be sure to record the positions of all potenti-  
ometers before starting troubleshooting.  
5. Turn the DCV set point potentiometer CW until the  
DCV LED turns off. The DCV LED should turn off  
when the potentiometer is approximately 9 v. The  
actuator should drive fully closed.  
1. Disconnect power at TR and TR1. All LEDs should be  
off. Exhaust fan contacts should be open.  
2. Disconnect device at P and P1.  
3. Jumper P to P1.  
6. Turn the DCV and Exhaust potentiometers CCW  
until the Exhaust LED turns on. The exhaust con-  
tacts will close 30 to 120 seconds after the Exhaust  
LED turns on.  
4. Disconnect wires at T and T1. Place 5.6 kilo-ohm  
resistor across T and T1.  
5. Jumper TR to 1.  
6. Jumper TR to N.  
7. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
7. If connected, remove sensor from terminals SO and +.  
Connect 1.2 kilo-ohm 4074EJ M checkout resistor  
across terminals SO and +.  
E. DCV Minimum and Maximum Position  
To check the DCV minimum and maximum position:  
8. Put 620-ohm resistor across terminals SR and +.  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
9. Set minimum position, DCV set point, and exhaust  
potentiometers fully CCW (counterclockwise).  
2. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The DCV LED should turn on. The  
actuator should drive to between 90 and 95% open.  
10. Set DCV maximum position potentiometer fully CW  
(clockwise).  
3. Turn the DCV Maximum Position potentiometer to  
midpoint. The actuator should drive to between 20  
and 80% open.  
11. Set enthalpy potentiometer to D.  
12. Apply power (24 vac) to terminals TR and TR1.  
B. Differential Enthalpy  
4. Turn the DCV Maximum Position potentiometer to  
fully CCW. The actuator should drive fully closed.  
To check differential enthalpy:  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
5. Turn the Minimum Position potentiometer to mid-  
point. The actuator should drive to between 20 and  
80% open.  
2. Place 620-ohm resistor across SO and +.  
6. Turn the Minimum Position Potentiometer fully CW.  
The actuator should drive fully open.  
3. Place 1.2 kilo-ohm resistor across SR and +. The Free  
Cool LED should be lit.  
7. Remove the jumper from TR and N. The actuator  
should drive fully closed.  
4. Remove 620-ohm resistor across SO and +. The Free  
Cool LED should turn off.  
8. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
5. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
F. Supply-Air Input  
C. Single Enthalpy  
To check supply-air input:  
To check single enthalpy:  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
2. Set the Enthalpy potentiometer to A. The Free Cool  
LED turns on. The actuator should drive to between  
20 and 80% open.  
2. Set the enthalpy potentiometer to A (fully CCW). The  
Free Cool LED should be lit.  
3. Set the enthalpy potentiometer to D (fully CW). The  
Free Cool LED should turn off.  
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.  
The actuator should drive fully open.  
4. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
—48—  
4. Remove the jumper across T and T1. The actuator  
should drive fully closed.  
4. Set minimum position, DCV set point, and exhaust  
potentiometers to previous settings.  
5. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
5. Remove 620-ohm resistor from terminals SR and +.  
6. Remove 1.2 kilo-ohm checkout resistor from termi-  
nals SO and +. If used, reconnect sensor from termi-  
nals SO and +.  
G. EconoMi$er IV Troubleshooting Completion  
This procedure is used to return the EconoMi$er IV to opera-  
tion. No troubleshooting or testing is done by performing the  
following procedure.  
7. Remove jumper from TR to N.  
8. Remove jumper from TR to 1.  
1. Disconnect power at TR and TR1.  
9. Remove 5.6 kilo-ohm resistor from T and T1. Recon-  
nect wires at T and T1.  
2. Set enthalpy potentiometer to previous setting.  
10. Remove jumper from P to P1. Reconnect device at P  
and P1.  
3. Set DCV maximum position potentiometer to previ-  
ous setting.  
11. Apply power (24 vac) to terminals TR and TR1.  
Table 33 — EconoMi$er IV Input/Output Logic  
INPUTS  
Enthalpy*  
OUTPUTS  
Compressor  
N Terminal†  
Demand Control  
Ventilation (DCV)  
Y1 Y2  
Occupied  
Minimum position  
Unoccupied  
Stage Stage  
Outdoor  
Return  
1
2
Damper  
Below set  
(DCV LED Off)  
High  
Low  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On  
On  
Off  
On  
Off  
Off  
On  
On  
Off  
On  
Off  
Off  
On  
Off  
Off  
Off  
Off  
Off  
On  
Off  
Off  
Off  
Off  
Off  
Closed  
(Free Cooling LED Off)  
Low  
High  
Low  
High  
Modulating** (between min.  
position and full-open)  
Modulating** (between  
closed and full-open)  
(Free Cooling LED On)  
Minimum position  
Modulating†† (between min.  
position and DCV maximum)  
Closed  
Above set  
(DCV LED On)  
High  
Modulating†† (between  
closed and DCV  
maximum)  
(Free Cooling LED Off)  
Low  
Modulating***  
Modulating†††  
(Free Cooling LED On)  
***Modulation is based on the greater of DCV and supply-air sensor  
signals, between minimum position and either maximum position  
(DCV) or fully open (supply-air signal).  
†††Modulation is based on the greater of DCV and supply-air sensor  
signals, between closed and either maximum position (DCV) or fully  
open (supply-air signal).  
*For single enthalpy control, the module compares outdoor enthalpy  
to the ABCD set point.  
†Power at N terminal determines Occupied/Unoccupied setting:  
24 vac (Occupied), no power (Unoccupied).  
**Modulation is based on the supply-air sensor signal.  
††Modulation is based on the DCV signal.  
Fig. 54 — EconoMi$er IV Functional View  
—49—  
INDEX  
Access panels 14  
Barometric flow capacity 16  
Charging chart, refrigerant 43-45  
Clearance 2, 5  
Perfect Humidity™ dehumidification  
system 11, 12, 21, 39-42, 45, 47  
Physical data  
Power supply  
6
CO2 sensor  
Wiring  
7
Configuration 20  
Settings 18, 20  
Compressor  
Pressure, drop  
EconoMi$er IV 23  
Electric heat 23  
Perfect Humidity dehumidification 21  
Pressure switches  
Lubrication 42  
Mounting 38  
Rotation 38  
High pressure  
Low pressure  
Pre-start-up 38  
Refrigerant  
6
6
Condensate drain  
Cleaning 42  
Location 2, 4  
Condenser coil  
Cleaning 41  
Condenser fan  
6
Charge 6, 42  
Type  
6
6
Refrigerant service ports 38  
Replacement parts 45  
Return air filter 6, 38  
Return air temperature sensor 17  
Rigging unit 2, 4  
Adjustment 42  
Control circuit  
Wiring 11  
Wiring raceway 11  
Convenience outlet 13  
Demand ventilation control 19  
Dehumidification 20  
Dimensions 3, 5  
Roof curb  
Assembly  
1
Dimensions  
3
Connector package  
3
4
Ductwork  
1
Leveling tolerances  
EconoMi$er IV 13-20, 48, 49  
Adjustment 42  
Weight  
6
Safety considerations  
Safety relief 39  
Service 41-45  
1
Components 14  
Damper movement 19  
Wiring 15  
Service ports 38  
Electrical connections  
Electrical data 8-10  
Electric heaters 10  
7
Slab mount  
1
Start-up 38-41  
Start-up checklist CL-1  
Supply air temperature sensor 14  
Thermostat 11  
Enthalpy changeover set points 18  
Evaporator coil  
Cleaning 41  
6
Troubleshooting 46-49  
Ventilation 39  
Evaporator fan motor  
Lubrication 42  
6
Weight  
Corner  
Motor data 22, 23  
Performance 24-37  
Pulley adjustment 22  
Pulley setting 6, 22  
5
EconoMi$er IV 5, 6  
Perfect Humidity dehumidification  
Unit 4-6  
6
Speed  
6
Wiring  
Factory-installed options  
Convenience outlet 13  
Disconnect switch 11  
EconoMi$er IV 13-20  
Manual outdoor air damper 13  
Perfect Humidity™ dehumidification  
system 11, 12  
EconoMi$er IV 15  
Humidistat 12  
Perfect Humidity system 12  
Power connections  
7
Filter  
Cleaning 42  
Installation 15  
Size  
6
Freeze protection thermostat  
Heat anticipator settings 11  
High flow valves 38  
6
High pressure switch  
Horizontal units 1, 2  
Humidistat 12  
6
Indoor air quality sensor 18  
Low pressure switch  
6
Manual outdoor air damper 13  
Mounting  
Unit  
2
Non-fused disconnect switch 11  
Operating sequence  
Cooling 39  
EconoMi$er IV 39  
Heating 39  
Perfect Humidity™ dehumidification  
package 39-41  
Outdoor air hood 13-15  
Outdoor air temperature sensor 14  
Outdoor air inlet screens  
Cleaning 42  
Copyright 2005 Bryant Heating & Cooling Systems  
Printed in U.S.A.  
CATALOG NO. 04-53551004-01  
START-UP CHECKLIST  
(Remove and Store in Job File)  
I. PRELIMINARY INFORMATION  
MODEL NO.: ______________________________________  
DATE:_____________________________________________  
BUILDING LOCATION: ____________________________  
SERIAL NO.: ___________________________________________  
TECHNICIAN: _________________________________________  
II. PRE-START-UP (insert checkmark in box as each item is completed)  
VERIFY J OBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE  
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS  
CHECK THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT  
CHECK THAT RETURN (INDOOR SECTION) AIR FILTERS ARE CLEAN AND IN PLACE  
VERIFY THAT UNIT INSTALLATION IS LEVEL  
CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING AND ORIFICE AND CHECK THAT  
SETSCREW IS TIGHT  
CHECK PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS  
CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTACT WITH REFRIGERANT LINES OR  
SHARP METAL EDGES  
III. START-UP  
ELECTRICAL  
SUPPLY VOLTAGE  
L1-L2  
L1  
L1  
L2-L3  
L2  
L2  
L3-L1  
L3  
L3  
CIRCUIT 1 COMPRESSOR AMPS  
CIRCUIT 2 COMPRESSOR AMPS  
EVAPORATOR FAN AMPS  
L1  
L2  
L3  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
COOLING SUPPLY AIR  
DB  
WB  
WB  
WB  
DB  
DB  
PRESSURES  
REFRIGERANT SUCTION, CIRCUIT 1  
REFRIGERANT SUCTION, CIRCUIT 2  
REFRIGERANT DISCHARGE, CIRCUIT 1  
REFRIGERANT DISCHARGE, CIRCUIT 2  
PSIG AT  
PSIG AT  
PSIG AT  
PSIG AT  
F (AT SERVICE PORT)  
F (AT SERVICE PORT)  
F (CONDENSER LIQUID LINE OUTLET TUBE)  
F (CONDENSER LIQUID LINE OUTLET TUBE)  
VERIFY THAT 3-PHASE SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION  
VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 43-45.  
Copyright 2005 Bryant Heating & Cooling Systems  
Printed in U.S.A.  
CL-1  
CATALOG NO. 04-53551004-01  

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