Carrier NP034 074 User Manual
48DJ,DK,NP034-074  
50DJ,DK,DW,DY,NB,NP034-074  
Single Package Heating and Cooling Units  
Installation, Start-Up and  
Service Instructions  
CONTENTS  
Page  
Page  
• COOLING, UNITS WITH ECONOMIZER  
• HEATING, UNITS WITH ECONOMIZER  
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2  
• VENTILATION AIR CIRCULATION (Continuous Fan)  
• AUTOMATIC CHANGEOVER USING AUTOMATIC  
CHANGEOVER THERMOSTAT  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37  
Rigging and Unit Placement . . . . . . . . . . . . . . . . . . 2  
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Roof Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Field-Fabricated Ductwork . . . . . . . . . . . . . . . . . . . . 6  
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Install Outdoor Hoods . . . . . . . . . . . . . . . . . . . . . . . 10  
• UNIT SIZES 034 AND 044  
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 42  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-53  
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
• COMPRESSORS  
• LIQUID SERVICE VALVES, FILTER DRIERS, AND  
SIGHT GLASSES  
• EVAPORATOR-FAN MOTORS, PULLEYS, AND  
BELTS  
• UNIT SIZES 054-074  
• POWER EXHAUST MOTORS, PULLEYS, AND  
BELTS  
Outdoor-Air Inlet Adjustments . . . . . . . . . . . . . . . 10  
• MANUAL OUTDOOR-AIR DAMPER  
• ECONOMIZER SETTINGS  
• UNIT CONTROL BOX  
• GAS HEAT SECTION (48 Series Units Only)  
• MAIN AND PILOT BURNERS (48 Series Units Only)  
• FLUE GAS PASSAGEWAYS (48 Series Units Only)  
• COMBUSTION AIR BLOWER (48 Series Units Only)  
• ECONOMIZER DAMPER MOTOR  
• ELECTRIC HEATER CONTROL BOX (50 Series  
Units Only)  
Field Wire Routing . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
• UNIT SIZES 034 AND 044  
• UNIT SIZES 054-074  
Field Electrical Connections . . . . . . . . . . . . . . . . . 17  
• POWER WIRING  
• CONTROL WIRING  
Gas Piping (48 Series Units Only) . . . . . . . . . . . . 36  
Installing Flue/Inlet Hoods (48 Series Units  
Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
• UNIT SIZES 034 AND 044  
• HEATER BOX (50 Series Units Only)  
• 25% OUTDOOR-AIR DAMPER  
• MODULATING POWER EXHAUST DAMPER  
MOTOR  
• RETURN-AIR FILTERS  
• CONDENSER FANS AND FAN MOTORS  
• INLET GUIDE VANE MOTOR  
• UNIT SIZES 054-074  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-41  
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . 38  
Evaporator-Fan Shipping Brackets . . . . . . . . . . . 38  
• UNIT SIZES 034 AND 044  
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
• COMPRESSORS  
• FAN SHAFT BEARINGS  
• UNIT SIZES 054-074  
• INLET GUIDE VANE BEARINGS (Units With  
Optional Inlet Guide Vanes)  
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Refrigerant Service Valves . . . . . . . . . . . . . . . . . . . 38  
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Gas Manifold Pressure (48 Series  
• FAN MOTOR BEARINGS  
• DOOR HINGES  
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
• EVAPORATOR FAN AND POWER EXHAUST  
MOTOR PLATE  
Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Unit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Leak Test and Dehydration . . . . . . . . . . . . . . . . . . 39  
Evaporator-Fan Belts, Pulleys, and Sheaves . . 39  
Condenser Fans and Motors . . . . . . . . . . . . . . . . . 40  
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 40  
Economizer Inlet Screens . . . . . . . . . . . . . . . . . . . 40  
Economizer Dampers . . . . . . . . . . . . . . . . . . . . . . . 40  
25% Outdoor-Air Damper . . . . . . . . . . . . . . . . . . . . 40  
Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41  
• MODULATING POWER EXHAUST DIFFERENTIAL  
PRESSURE SWITCH  
• INLET GUIDE VANE DIFFERENTIAL PRESSURE  
SWITCH (Units With Optional Inlet Guide Vanes and  
Static Pressure Control)  
• BELT INSTALLATION AND TENSIONING  
• PULLEY ALIGNMENT  
• INSTALLING ALTERNATE MOTOR PULLEY  
(Evaporator Fan Only)  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41,42  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41  
Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . 41  
• COOLING, UNITS WITHOUT ECONOMIZER  
• HEATING, UNITS WITHOUT ECONOMIZER  
• CONDENSER FAN ADJUSTMENT  
• 25% OUTDOOR-AIR DAMPER  
• REFRIGERANT CHARGE  
• PILOT LIGHT OFF (48 Series Units Only)  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1  
1
PC 111  
Catalog No. 564-818  
Printed in U.S.A.  
Form 48/50D,N-9SI  
Pg 1  
3-96  
Replaces: 48DJ,DK-3SI;  
48/50NB,NP-1SI; 50DJ,DK-9SI  
Tab 1a 1b  
NOTES:  
1. Sizes 034,044: Rig with 4 cables and spread with two 95 in. (2413 mm) and  
2 ЈA ϩ AЈ long spreader bars.  
Sizes 054-074: Rig with 4 cables and spread with four 95 in. (2413 mm) and  
2 ЈA ϩ B ϩ AЈ long spreader bars.  
2. Center of gravity includes economizer.  
1. All panels must be in place when rigging.  
2. Unit is not designed for handling by forklift truck.  
RIGGING WEIGHTS AND DIMENSIONS  
UNIT WEIGHT*  
A
B
UNIT  
Lb  
Kg  
in.  
mm  
in.  
mm  
2780  
2804  
3240  
3267  
48DJD,DKD,NPD034  
48DJE,NPE034  
5941  
6070  
6841  
6970  
9230  
9350  
9530  
9650  
9950  
10,080  
5700  
6270  
6350  
6920  
8230  
8780  
8530  
9080  
8960  
9500  
2694.8  
2753.4  
3103.1  
3161.6  
4186.7  
4241.2  
4322.8  
4377.2  
4513.3  
4572.3  
2585.5  
2844.1  
2880.4  
3138.9  
3733.1  
3982.6  
3869.2  
4119.7  
4064.3  
4309.2  
109.4  
110.4  
127.6  
128.6  
86.0  
2185  
48DJD,DKD,NPD044  
48DJE,NPE044  
92.6  
121.5  
134.7  
2353  
3086  
3421  
48DJD,DKD,NPD054  
48DJE,NPE054  
126.8  
3221  
48DJD,DKD,NPD064  
48DJE,NPE064  
48DJD,DKD,NPD074  
48DJE,NPE074  
134.7  
3421  
50DJ,DK,NP034  
84.8  
76.4  
2153  
1940  
2353  
2185  
3066  
2769  
3071  
3066  
3345  
2769  
120.8  
102.5  
126.6  
108.4  
126.8  
109.0  
120.9  
126.8  
137.6  
109.0  
3067  
2604  
3216  
2753  
3221  
2769  
3071  
3221  
3495  
2769  
50DW,DY,NB034  
50DJ,DK,NP044  
92.6  
50DW,DY,NB044  
50DJ,DK,NP054  
86.0  
120.8  
109.0  
120.9  
120.8  
131.7  
109.0  
50DW,DY,NB054  
50DJ,DK,NP064  
50DW,DY,NB064  
50DJ,DK,NP074  
50DW,DY,NB074  
*Includes optional economizer.  
Fig. 1 — Rigging Label  
If roof curb is not used, support unit with steel beams along  
its entire length and then support steel as required. As a mini-  
mum, unit must be supported across its width at each lifting  
lug location.  
Do not install unit in an indoor location. Do not locate air  
inlets near exhaust vents or other sources of contaminated  
air.  
On units equipped with or power exhaust option, high ve-  
locity air is exhausted out the hoods. Unit should be posi-  
tioned with at least 10 ft clearance between the exhaust hoods  
and any obstruction. Although unit is weatherproof, guard  
against water from higher level runoff and overhangs.  
Positioning — Provide clearance around and above unit  
for airflow, safety, and service access. Do not restrict top (area  
above condenser fans) in any way. Allow at least 6 ft on all  
sides for rated performance, code compliance, and service.  
3
Table 1A — Physical Data; 034, 044 Units  
BASE UNIT*  
034  
044  
NOMINAL CAPACITY (tons)  
30  
40  
OPERATING WEIGHT (lb)  
Base Unit  
48 Series, Low Heat  
5641  
5770  
5970  
5400  
6541  
6670  
6620  
6050  
48 Series, High Heat  
50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
With Economizer  
48 Series, Low Heat  
48 Series, High Heat  
50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
5941  
6070  
6270  
5700  
6841  
6970  
6920  
6350  
Semi-Hermetic  
COMPRESSORS  
Quantity...Type  
2...06D  
17, 33, 50, 66, 83, 100  
2
2...06E  
25, 50, 75, 100  
2
Capacity Steps (%)  
Number of Refrigerant Circuits  
REFRIGERANT  
Operating Charge (lb), Sys 1/Sys 2  
Without Hot Gas Bypass  
With Hot Gas Bypass  
29.0/29.0  
31.0/29.0  
40.0/40.0  
42.0/40.0  
3
CONDENSER COILS  
Quantity  
⁄
8-in. Tube Diameter  
2-in. Tube Diameter  
2
2
Rows...Fins/in.  
Aluminum  
3...15.0  
3...13.7  
37.5  
3...15.0  
3...13.7  
50.0  
Copper (Optional)  
Total Face Area (sq ft)  
1
EVAPORATOR COILS  
Quantity  
Rows...Fins/in.  
Total Face Area (sq ft)  
Refrigerant Feed Device...No. per Circuit  
⁄
1
2
3...15.0  
3...15.0  
32.1  
45.5  
TXV...1  
TXV...2  
HEATING SECTION (48 Series Units Only)  
Number of Heat Exchangers  
Input (MBtuh)  
Low Heat  
6
264  
211  
0-30  
79  
High Heat  
12  
529  
423  
15-45  
79  
Low Heat  
High Heat  
12  
529  
423  
15-45  
79  
6
264  
211  
0-30  
79  
Output (MBtuh)  
Temperature Rise Range (F)  
Efficiency (%)  
Burner Orifice Diameter  
Quantity (in. ...drill no.)  
Pilot Orifice Diameter  
Quantity (in. ...drill no.)  
Firing Stages  
6 (.1285...30)  
12 (.1285...30)  
6 (.1285...30)  
12 (.1285...30)  
1 (.076...48)  
2 (.076...48)  
1 (.076...48)  
2 (.076...48)  
2
1
2
2
2
1
2
2
Number of Gas Valves  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Cfm  
Propeller Type  
2...30  
3...30  
18,600  
26,000  
Motor Hp...Rpm  
1.0...1140  
1.0...1140  
EVAPORATOR FAN  
Centrifugal 25 x 25 in.  
Nominal Cfm  
10,500  
15,000  
900  
14,000  
20,000  
900  
Maximum Allowable Cfm  
Maximum Allowable Rpm  
Shaft Diameter at Pulley (in.)  
111⁄16  
111⁄16  
EVAPORATOR-FAN MOTOR AND DRIVE  
Motor Hp  
(Any motor available on any unit)  
7.5  
10.0  
15.0  
20.0  
Motor Frame Size  
213T  
215T  
254T  
256T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency†  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Resulting Fan Rpm  
82.9  
—
13.7  
34.4  
405  
85.6  
89.5  
13.7  
4.3  
84.5  
90.0  
13.7  
4.9  
87.5  
91.0  
13.7  
5.5  
510  
580  
660  
Belts Quantity...Model No.  
48 Series and 50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
Center Distance Range (in.)  
48 Series and 50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
2...BX60  
2...BX60  
2...5VX630  
2...5VX630  
2...5VX630  
2...5VX630  
2...5VX630  
2...5VX630  
17.74...14.30  
19.86...15.87  
17.74...14.30  
19.86...15.87  
17.63...14.01  
19.04...15.00  
17.63...14.01  
19.04...15.00  
OPTIONAL POWER EXHAUST  
Quantity...Motor Hp  
Centrifugal, 15 x 15 in. (Any motor available on any unit)  
2...3.0  
56HZ  
81.0  
2...5.0  
184T  
2...7.5  
213T  
82.9  
Motor Frame Size  
Efficiency at Full Load (%)  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Shaft Diameter at Pulley (in.)  
Resulting Fan Rpm  
Maximum Allowable Rpm  
Belts Quantity...No.  
84.0  
6.9  
6.9  
6.9  
3.35  
4.12  
5.0  
13⁄16  
13⁄16  
13⁄16  
843  
1040  
1264  
1300  
1300  
2...3VX670  
1300  
2...3VX670  
2...3VX710  
FILTERS  
Standard Efficiency Throwaway (Standard)  
Quantity...Size (in.)  
12...20 x 25 x 2  
12...20 x 25 x 2  
4...16 x 20 x 2  
12...20 x 25 x 2  
4...16 x 20 x 2  
6...20 x 24 x 22  
6...20 x 20 x 22  
4...16 x 20 x 2  
12...20 x 25 x 2  
4...16 x 20 x 2  
6...20 x 24 x 22  
6...20 x 20 x 22  
Medium Efficiency (30%) Pleated (Optional)  
Quantity...Size (in.)  
High Efficiency (90%) Bag Filters with Prefilters (Optional)  
Quantity...Size (in.)  
TXV — Thermostatic Expansion Valve  
*Data is for all 48 and 50 Series units of the size listed unless otherwise specified.  
†Not available on 575-v units.  
4
Table 1B — Physical Data; 054-074 Units  
BASE UNIT*  
054  
064  
074  
NOMINAL CAPACITY (tons)  
50  
60  
75  
OPERATING WEIGHT (lb)  
Base Unit  
48 Series, Low Heat  
8700  
8820  
8250  
7700  
9000  
9120  
8550  
8000  
9420  
9550  
8970  
8430  
48 Series, High Heat  
50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
With Economizer  
48 Series, Low Heat  
48 Series, High Heat  
50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
9230  
9350  
8780  
8230  
9530  
9650  
9080  
8530  
9950  
10,080  
9500  
8960  
COMPRESSORS  
Semi-Hermetic  
Quantity...Type  
2...06E  
20, 40, 60, 80, 100  
2
2...06E  
2...06E  
14, 28, 43, 71, 85, 100  
2
Capacity Steps (%)  
Number of Refrigerant Circuits  
17, 33, 50, 66, 83, 100  
2
REFRIGERANT  
Operating Charge (lb), Sys 1/Sys 2  
Without Hot Gas Bypass  
With Hot Gas Bypass  
59.0/44.5  
62.0/44.5  
61.0/61.0  
64.0/61.0  
70.5/64.5  
73.5/64.5  
3
CONDENSER COILS  
Quantity  
⁄
8-in. Tube Diameter  
4
4
4
Rows...Fins/in.  
Aluminum  
2...17.0, 3...17.0  
2...15.7, 3...15.7  
72.4  
3...17.0  
3...15.7  
72.4  
3...17.0  
3...15.7  
108.4  
Copper (Optional)  
Total Face Area (sq ft)  
1
EVAPORATOR COILS  
Quantity  
⁄
2-in. Tube Diameter  
2
2
2
Rows...Fins/in.  
3...17.0  
61.5  
4...17.0  
61.5  
4...17.0  
61.5  
Total Face Area (sq ft)  
Refrigerant Feed Device...  
No. per Circuit  
TXV...2  
TXV...2  
TXV..2  
HEATING SECTION (48 Series Units Only)  
Number of Heat Exchangers  
Input (MBtuh)  
Low Heat  
High Heat  
18  
Low Heat  
12  
High Heat  
18  
Low Heat  
12  
High Heat  
18  
12  
540  
432  
5-35  
80  
810  
540  
810  
540  
810  
Output (MBtuh)  
648  
15-45  
80  
432  
5-35  
80  
648  
15-45  
80  
432  
5-35  
80  
648  
15-45  
80  
Temperature Rise Range (F)  
Efficiency (%)  
Burner Orifice Diameter  
Quantity (in. ...drill no.)  
Pilot Orifice Diameter  
Quantity (in. ...drill no.)  
Firing Stages  
12 (.1285...30) 18 (.1285...30) 12 (.1285...30) 18 (.1285...30) 12 (.1285...30) 18 (.1285...30)  
2 (.076...48)  
3 (.076...48)  
2 (.076...48)  
3 (.076...48)  
2 (.076...48)  
3 (.076...48)  
2
2
2
3
2
2
2
3
2
2
2
3
Number of Gas Valves  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Cfm  
Propeller Type  
4...30  
4...30  
40,000  
5...30  
40,000  
50,000  
Motor Hp...Rpm  
1.0...1140  
1.0...1140  
1.0...1140  
EVAPORATOR FAN  
Centrifugal 30 x 27 in.  
Nominal Cfm  
17,500  
25,000  
750  
21,000  
30,000  
750  
24,500  
30,000  
750  
Maximum Allowable Cfm  
Maximum Allowable Rpm  
Shaft Diameter at Pulley (in.)  
111⁄16  
111⁄16  
111⁄16  
EVAPORATOR-FAN MOTOR AND DRIVE  
Motor Hp  
(Any motor available on any unit)  
15.0  
20.0  
25.0  
30.0  
Motor Frame Size  
254T  
256T  
284T  
286T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency†  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Resulting Fan Rpm  
84.5  
90.0  
13.7  
4.5  
87.5  
91.0  
13.7  
5.1  
87.1  
91.7  
13.7  
5.5  
88.3  
92.4  
15.5  
5.9  
555  
625  
660  
700  
Belts Quantity...Model No.  
48 Series and 50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
Center Distance Range (in.)  
48 Series and 50 Series, Horizontal Discharge  
50 Series, Vertical Discharge  
2...5VX1120  
2...5VX1230  
2...5VX1150  
2...5VX1230  
2...5VX1150  
2...5VX1230  
2...5VX1180  
2...5VX1230  
48.25...44.00  
44.25...39.75  
48.25...44.00  
44.25...39.75  
48.50...44.25  
44.00...40.00  
48.50...44.25  
44.00...40.00  
OPTIONAL POWER EXHAUST  
Quantity...Motor Hp  
Centrifugal, 18 x 15 in. (Any motor available on any unit)  
2...5.0  
184T  
84.0  
10.6  
4.5  
2...7.5  
213T  
82.9  
10.6  
5.0  
2...10.0  
Motor Frame Size  
215T  
85.6  
10.6  
5.6  
Efficiency at Full Load (%)  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Shaft Diameter at Pulley (in.)  
Resulting Fan Rpm  
17⁄16  
740  
17⁄16  
820  
17⁄16  
920  
925  
Maximum Allowable Rpm  
925  
925  
FILTERS  
Standard Efficiency  
Throwaway (Standard)  
Quantity...Size (in.)  
15...20 x 25 x 2  
5...16 x 20 x 2  
15...20 x 25 x 2  
5...16 x 20 x 2  
15...20 x 25 x 2  
5...16 x 20 x 2  
15...20 x 25 x 2  
5...16 x 20 x 2  
15...20 x 25 x 2  
5...16 x 20 x 2  
15...20 x 25 x 2  
5...16 x 20 x 2  
Medium Efficiency (30%) Pleated (Optional)  
Quantity...Size (in.)  
High Efficiency (90%) Bag Filters  
with Prefilters (Optional)  
Quantity...Size (in.)  
6...20 x 24 x 22  
6...24 x 24 x 22  
6...20 x 24 x 22  
6...24 x 24 x 22  
6...20 x 24 x 22  
6...24 x 24 x 22  
TXV — Thermostatic Expansion Valve  
*Data is for all 48 and 50 Series units of the size listed unless otherwise specified.  
†Not available on 575-v units.  
5
Table 2 — Operating Weights of Options and Accessories  
UNIT SIZE  
OPTION OR ACCESSORY  
034  
044  
054  
064  
074  
Roof Curb  
450  
450  
380  
480  
480  
465  
515  
560  
515  
515  
560  
515  
515  
560  
515  
48DJ,DK,NP  
50DW,DY,NB  
50DJ,DK,NP  
Condenser Section Roof Curb  
Economizer  
—
300*  
600*  
200  
20  
—
300*  
600*  
200  
20  
540  
530*  
710*  
200  
20  
540  
530*  
710*  
200  
20  
625  
530*  
710*  
200  
20  
Power Exhaust  
Barometric Relief  
High-Efficiency Filters  
Bag filters  
35  
35  
40  
40  
40  
Hail Guard  
120  
180  
150  
95  
150  
235  
150  
95  
145  
235  
150  
115  
145  
235  
150  
115  
210  
420  
150  
115  
Copper Condenser Coil Fins  
Electric Heat†  
Inlet Guide Vanes  
*Includes hood.  
†50 Series vertical discharge units.  
UNIT CENTER OF GRAVITY AND CORNER WEIGHTS  
CORNER WEIGHT (lb)  
DIMENSIONS (Ft-in.)  
UNIT  
1
2
3
4
A
B
034  
1754  
2035  
2334  
2431  
2452  
1781  
2057  
2375  
2393  
2494  
1864  
2070  
2381  
2461  
2551  
1674  
1879  
2090  
2188  
2212  
1213  
1382  
2276  
2328  
2518  
1251  
1424  
2295  
2373  
2541  
1268  
1387  
2005  
2074  
2194  
1173  
1292  
2021  
2073  
2263  
1216  
1385  
2281  
2334  
2523  
1253  
1428  
2300  
2378  
2546  
1271  
1389  
2009  
2078  
2199  
1175  
1295  
2025  
2077  
2269  
1758  
2039  
2339  
2437  
2457  
1785  
2061  
2380  
2506  
2499  
1867  
2074  
2385  
2467  
2556  
1678  
1884  
2094  
2192  
2216  
14- 9  
17- 3  
19- 7  
19- 7  
21- 0  
14- 8  
17- 2  
19- 7  
19- 7  
21- 0  
13- 3  
15-10  
19-10  
19-10  
21- 3  
13- 9  
16- 3  
18- 2  
18- 2  
21- 3  
3- 8  
3- 8  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
3-10  
044  
054  
064  
074  
034  
044  
054  
064  
074  
034  
044  
054  
064  
074  
034  
044  
054  
064  
074  
48DJD,DKD,NPD  
48DJE,NPE  
50DW,DY,NB  
50DJ,DK,NP  
NOTE: Weights include economizer.  
Fig. 2 — Weight Distribution and Center of Gravity  
Secure all ducts to the building structure, using flexible  
duct connectors between roof curb and ducts as required. Ducts  
passing through an unconditioned space must be insulated  
and covered with a vapor barrier. Outlet grilles must not lie  
directly below unit discharge. The return duct must have a  
90-degree elbow before opening into the building space if  
unit is equipped with power exhaust.  
Field-Fabricated Ductwork — Units are designed for  
vertical supply/return only. Field-fabricated ductwork should  
be attached to the roof curb. Supply and return duct dimen-  
sions are shown in Fig. 3A-3C.  
To attach ductwork to roof curb, insert duct approxi-  
mately 10 to 11 in. up into roof curb. Connect ductwork to  
14-gage roof curb material with sheet metal screws driven  
from inside of the duct.  
Design supply duct strong enough to handle expected static  
pressures.  
6
NOTES:  
X
Y
UNIT  
UNIT  
SIZE  
1. Roof curb is shipped unassembled.  
2. Roof curb: 14 gage (VA03-56) steel.  
3. Dimensions in [ ] are millimeters.  
MODEL  
mm  
6606  
6131  
7825  
7344  
ft-in.  
mm  
4056  
3311  
4893  
4141  
ft-in.  
48DJ,DK,NP  
50DW,DY,NB  
50DJ,DK,NP  
48DJ,DK,NP  
50DW,DY,NB  
50DJ,DK,NP  
034  
034  
034  
044  
044  
044  
21-81⁄16  
20-13⁄8  
25-81⁄16  
24-11⁄8  
13- 311⁄16  
10-103⁄8  
16- 05⁄8  
13- 71⁄16  
NOTE: To prevent the hazard of stagnant water build-up in the  
drain pan of the indoor-air section, unit can only be pitched as  
shown.  
*F
Fig. 3A — Roof Curb; 034, 044 Units  
7
NOTES:  
X
Y
Z
UNIT  
UNIT  
SIZE  
1. Roof curb is shipped unassembled.  
2. Roof curb: 14 gage (VA03-56) steel.  
3. Dimensions in [ ] are millimeters.  
4. Suggested hole location for field wiring  
through roof curb (holes to be field drilled).  
MODEL  
mm  
2474  
2458  
3383  
3367  
ft-in.  
8-13⁄8  
mm  
8476  
7444  
8476  
7444  
ft-in.  
mm  
6965  
5933  
6965  
5933  
ft-in.  
48DJ,DK,NP  
50DW,DY,NB  
50DJ,DK,NP  
48DJ,DK,NP  
50DW,DY,NB  
50DJ,DK,NP  
054,064  
054,064  
054,064  
074  
27-911⁄16  
24-51⁄16  
27-911⁄16  
24-51⁄16  
22-103⁄16  
19- 59⁄16  
22-103⁄16  
19- 59⁄16  
8-03⁄4  
11-13⁄16  
11-09⁄16  
NOTE: To prevent the hazard of stagnant water build-up in the  
drain pan of the indoor-air section, unit can only be pitched as  
shown.  
074  
074  
*F
Fig. 3B — Roof Curb; 054-074 Units  
8
UNIT LEVELING TOLERANCES  
DIMENSION X  
UNIT  
SIZE  
DIMENSIONS*  
(degrees and inches)  
mm  
Ft-in.  
0-105⁄8  
0-101⁄16  
054,064  
074  
270  
255  
A
B
Deg  
in.  
Deg  
in.  
1.0  
2.0  
.50  
.75  
*From edge of unit to horizontal.  
NOTE: To prevent the hazard of stagnant water  
n,  
Fig. 3C — Condenser Section Roof Curb (054-074 Units Only)  
9
3. Remove the holddown screw from each upper corner of  
each economizer hood.  
4. Pivot hoods outward. (There is a total of 4 hoods.)  
5. Install 18 screws, (5 each side, 6 top, and 2 bottom), around  
the outside of each hood. (Screws are in the fastener pack-  
age taped to the basepan inside the fan section.)  
6. Apply a bead of RTV or similar sealant to corner of econo-  
mizer hood at pivot point to prevent water leaks. (See  
Fig. 9.)  
Condensate Drains — See Fig. 4A-4D and Fig. 5 for  
drain locations. The drain assemblies, each consisting of a  
10-gage plate with a 11⁄4-in. half coupling welded to it, are  
shipped in the unit fan section. Also included are 16-gage  
seal plates to cover the drain holes not being used. Open the  
access door marked FAN SECTION to find the drain assem-  
blies, seal plates, and 4 screws for each mounting taped to  
the unit basepan.  
After the unit has been set in place on the roof:  
1. Select the appropriate drain locations. The 034 units have  
6 drain holes (3 per side), and the 044-074 units have 8  
drain holes (4 per side). Two holes on each side must be  
selected for condensate drains as shown in Fig. 5, and the  
remaining holes must be sealed.  
2. Remove the drain assemblies and attach them to the bot-  
tom of the unit base rails at the preferred drain locations  
using the screws provided. See Fig. 6.  
NOTE: Use a trap at least 4-in. deep.  
3. Cover the remaining drain holes with the seal plates and  
screws provided. See Fig. 7.  
Outdoor-Air Inlet Adjustments  
MANUAL OUTDOOR-AIR DAMPER (Units Without Econo-  
mizer Option) —All units except those equipped with a factory-  
installed economizer have a manual outdoor-air damper to  
provide ventilation air. This damper can be preset to admit  
up to 25% outdoor air into the return-air compartment. To  
adjust, loosen the blade limiter screws as shown in Fig. 10  
and move the damper to the desired position. Then retighten  
the blade limiter screws to secure the damper. See Fig. 10.  
(To make this adjustment, it is necessary to remove the screens  
covering the hood opening and make adjustments from in-  
side the hood.)  
4. Apply a bead of RTV or similar sealant around the drain  
assemblies and seal plates where they attach to the base  
rail. See Fig. 8.  
ECONOMIZER SETTINGS  
Enthalpy Sensor (See Fig. 11.) — This sensor is located be-  
hind the filters in the end economizer hood (the upper hood  
on sizes 054-074). See Fig. 12. For maximum benefit of out-  
door air, set enthalpy sensor control to the A setting. At this  
setting, when the relative humidity is 50%, and the outdoor  
air is below 74 F, the sensor’s relay contacts will be closed.  
See Fig. 13 and 14.  
NOTE: If unit is slab mounted, holes will need to be drilled  
in the side of the base rail and the holes factory-drilled in the  
bottom of the base rail will need to be plugged.  
Install Outdoor Hoods  
UNIT SIZES 034 AND 044  
25% Outdoor-Air Hoods (Units Without Economizer  
Option)  
1. Outdoor-air hoods are shipped bolted to the unit in a ship-  
ping position. Remove the 6 screws holding each 25% air  
hood shipping cover in place.  
2. Replace the 6 screws.  
3. Remove the holddown screw from each upper corner of  
each hood.  
NOTE: Enthalpy control setting dial is on the economizer  
motor.  
Mixed-Air Thermistor (MAT) — This control set point ad-  
justment is on the top of the economizer motor. This motor  
is located in the return-air section, and is accessed by open-  
ing the access panel marked FILTER SECTION. See  
Fig. 15. Set MAT set point adjustment dial to the desired  
setting. The factory setting is 55 F ± 5° F; range is 40 to  
90 F. The MAT is located on the filter rack.  
4. Pivot hoods outward (2 hoods total).  
Damper Vent Position — The position setting adjustment is  
located on the cover of the economizer motor. See Fig. 15.  
Adjust by setting the fan switch at ON position (continuous  
fan operation), and setting the system selector switch to OFF  
position. Then turn adjustment screw slowly until the damp-  
ers assume the desired vent position. Do not manually op-  
erate the damper motor; damage to the motor may result.  
Economizer Damper Linkage Adjustment — When replac-  
ing economizer damper motors, or if the linkage has come  
loose, it is critical that the linkages be adjusted correctly.  
They are sensitive, and incorrect adjustment can cause the  
motor to stall.  
5. Install 17 screws around outside of each hood. (Screws  
are in the fastener package taped to the basepan inside  
the fan section.)  
6. Apply a bead of RTV or similar sealant to corner of each  
hood at pivot point to prevent water leaks. See Fig. 9.  
Economizer Hoods (Units With Economizer Option) — Fol-  
low the same procedure described in 25% Outdoor-Air Hoods  
section above.  
UNIT SIZES 054-074  
25% Outdoor-Air Hoods — The outdoor-air hoods are fac-  
tory installed on the 054-074 units.  
Economizer Hoods (Units With Economizer Option)  
1. Remove the 6 screws holding each of the 4 economizer  
shipping covers in place.  
2. Replace the screws.  
NB,NP Unit Minimum Position Set Point — Minimum econo-  
mizer position is set using the keypad and display module.  
Refer to Control and Troubleshooting literature for more  
details.  
10  
WEIGHT  
lb kg  
5641 2559 4498 14-91⁄8  
A
B
C
D
E
F
G
H
J
UNIT  
SIZE  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
48DJD,DKD,NPD  
48DJE,NPE  
034 5770 2617 4474 14-81⁄8 3662 12-03⁄16 7278 23-109⁄16 1709 5-75⁄16 2216 7- 31⁄4 4228 13-107⁄16 2746  
9-01⁄8  
—
—
3626 12-109⁄16  
50DW,DY,NB  
48DJD,DKD,NPD  
48DJE,NPE  
5970 2708 4044 13-31⁄4  
6541 2967 5255 17-27⁄8  
044 6670 2708 5229 17-17⁄8 4497 14-91⁄16 8496 27-101⁄2 2328 7-75⁄8 2091 6-105⁄16 4706 15-5  
6620 3003 4823 15-97⁄8  
3363 11-03⁄8 3769 12-43⁄8 4762 15-71⁄2  
50DW,DY,NB  
LEGEND  
For smaller service and operational clearances, con-  
tact Carrier Product Engineering Department.  
4. Vertical discharge ducts designed to be attached to  
accessory roof curb. If unit is mounted on dunnage,  
support the ducts using cross braces as done on the  
accessory roof curb.  
5. When unit is slab mounted, locate the condensate  
drain as low as possible on vertical face of base rail  
at the same location as the standard condensate drain  
(using factory supplied fitting). Plug factory drilled con-  
densate hole.  
K
L
CONN  
DIM  
NOTES:  
—
—
Connection  
Dimension  
UNIT  
SIZE  
mm  
ft-in.  
mm  
ft-in.  
48DJD,DKD,NPD  
48DJE,NPE  
1. Dimensions in [ ] are in millimeters.  
034  
4741  
15-6  
6797  
22-35⁄8  
2.  
Center of Gravity includes economizer. Unit weight does  
50DW,DY,NB  
48DJD,DKD,NPD  
48DJE,NPE  
not include economizer.  
3. Unit clearances:  
Top — Do not restrict condenser fans  
Control Box End — 6Ј-0Љ  
044  
5576  
8-31⁄2  
8015  
26-39⁄16  
Sides — 6Ј-0Љ  
50DW,DY,NB  
Economizer End — 6Ј-0Љ (except power exhaust units 10Ј-0Љ)  
Fig. 4A — Base Unit Dimensional Drawing; 48DJ,DK,NP/50DW,DY,NB034,044 Units  
11  
WEIGHT  
lb kg  
5400 2449 4198 13-91⁄4  
6050 2744 4948 16-213⁄16  
A
B
C
D
E
F
G
H
UNIT  
SIZE  
mm  
ft-in.  
mm  
ft-in.  
9-613⁄16  
mm  
ft-in.  
mm  
ft-in.  
5-73⁄8  
mm  
ft-in.  
mm  
4428  
3363  
ft-in.  
9-01⁄8  
11-03⁄8  
mm  
ft-in.  
mm  
ft-in.  
034  
044  
2916  
6802 22-313⁄16  
8015 26-39⁄16  
1711  
2216 7- 31⁄4  
2091 6-105⁄16  
3762 12-43⁄8  
4306 14-11⁄2  
—
—
50DJ,DK,NP  
3746 12-31⁄2  
2247 7-47⁄16  
3769 12-43⁄8  
LEGEND  
For smaller service and operational clearances, con-  
tact Carrier Product Engineering Department.  
4. Vertical discharge ducts designed to be attached to  
accessory roof curb. If unit is mounted on dunnage,  
support the ducts using cross braces as done on the  
accessory roof curb.  
5. When unit is slab mounted, locate the condensate  
drain as low as possible on vertical face of base rail  
at the same location as the standard condensate drain  
(using factory supplied fitting). Plug factory drilled con-  
densate hole.  
J
K
CONN  
—
—
Connection  
Dimension  
UNIT  
SIZE  
mm  
4168  
4999  
ft-in.  
mm  
6321  
7534  
ft-in.  
DIM  
NOTES:  
034  
044  
13-81⁄16  
16-413⁄16  
20-87⁄8  
24-85⁄8  
50DJ,DK,NP  
1. Dimensions in [ ] are in millimeters.  
2. Center of Gravity includes economizer. Unit  
weight does not include economizer.  
3. Unit clearances:  
Top — Do not restrict condenser fans  
Control Box End — 6Ј-0Љ  
Sides — 6Ј-0Љ  
Economizer End — 6Ј-0Љ (except power exhaust units  
10Ј-0Љ)  
Fig. 4B — Base Unit Dimensional Drawing; 50DJ,DK,NP034,044 Units  
12  
WEIGHT  
A
B
C
D
E
F
G
UNIT  
SIZE  
lb  
kg  
mm  
5969  
6045  
5969  
6045  
6401  
6477  
ft-in.  
19-7  
mm  
6717  
7676  
6717  
7676  
6717  
7676  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
2718  
2830  
2718  
2830  
3543  
3694  
ft-in.  
8-11  
mm  
6541  
6427  
6541  
6427  
5715  
5563  
ft-in.  
21-51⁄2  
21-1  
mm  
ft-in.  
48DJD,DKD,NPD  
48DJE,NPE  
8700  
8820  
8250  
9000  
9120  
8550  
9420  
9550  
8970  
3946  
4000  
3742  
4082  
4137  
3878  
4273  
4332  
4069  
22-07⁄16  
25-23⁄16  
22-07⁄16  
25-23⁄16  
22-07⁄16  
25-23⁄16  
054  
1163  
3-913⁄16  
11,524  
37-911⁄16  
11,140  
36-69⁄16  
50DW,DY,NB  
48DJD,DKD,NPD  
48DJE,NPE  
19-10  
19-7  
9-33⁄4  
8-11  
21-51⁄2  
21-1  
064  
074  
1163  
1163  
3-913⁄16  
3-913⁄16  
11,524  
12,433  
37-911⁄16  
40-91⁄2  
11,140  
12,049  
36-69⁄16  
39-63⁄8  
50DW,DY,NB  
48DJD,DKD,NPD  
48DJE,NPE  
19-10  
21-0  
9-33⁄4  
11-71⁄2  
12-13⁄4  
18-9  
50DW,DY,NB  
21-3  
18-3  
LEGEND  
Economizer End — 6Ј-0Љ (except power exhaust units 10Ј-0Љ)  
For smaller service and operational clearances, contact Carrier Product Engineering  
Department.  
CONN  
DIM  
—
—
Connection  
Dimension  
4. Vertical discharge ducts designed to be attached to accessory roof curb. If unit is mounted  
on dunnage, support the ducts using cross braces as done on the accessory roof curb.  
5. When unit is slab mounted, locate the condensate drain as low as possible on vertical  
face of base rail at the same location as the standard condensate drain (using factory  
supplied fitting). Plug factory drilled condensate hole.  
*Dimension shown is for 48 series units. On 50 series units, dimension given is measured from  
economizer end of unit to drain connection closest to condenser fans.  
NOTES:  
1. Dimensions in [ ] are in millimeters.  
2.  
Center of Gravity includes economizer. Unit weight does not include economizer.  
3. Unit clearances:  
Top — Do not restrict condenser fans  
Control Box End — 6Ј-0Љ  
Sides — 6Ј-0Љ (except power exhaust units 10Ј-0Љ)  
Fig. 4C — Base Unit Dimensional Drawing; 48DJ,DK,NP/50DW,DY,NB054-074 Units  
13  
Weight  
A
B
C
D
E
F
UNIT  
SIZE  
Lb  
Kg  
mm  
5537  
5969  
ft-in.  
18-2  
21-3  
mm  
1163  
1163  
ft-in.  
mm  
ft-in.  
34-47⁄16  
37-41⁄4  
mm  
2864  
3727  
ft-in.  
9-43⁄4  
mm  
ft-in.  
33-15⁄16  
36-11⁄8  
mm  
5347  
4483  
ft-in.  
054  
064  
074  
7700  
8000  
8430  
3493  
3629  
3824  
3-913⁄16  
3-913⁄16  
10,476  
11,385  
10,092  
11,001  
17-61⁄2  
14-81⁄2  
50DJ,DK,NP  
12-23⁄4  
LEGEND  
Economizer End — 6Ј-0Љ (except power exhaust units 10Ј-0Љ)  
For smaller service and operational clearances, contact Carrier Product En-  
gineering Department.  
4. Vertical discharge ducts designed to be attached to accessory roof curb. If  
unit is mounted on dunnage, support the ducts using cross braces as done  
on the accessory roof curb.  
5. When unit is slab mounted, locate the condensate drain as low as possible  
on vertical face of base rail at the same location as the standard conden-  
sate drain (using factory supplied fitting). Plug factory drilled condensate  
hole.  
CONN  
DIM  
—
—
Connection  
Dimension  
*Dimension shown is for 48 series units. On 50 series units, dimension given  
is measured from economizer end of unit to drain connection closest to con-  
denser fans.  
NOTES:  
1. Dimensions in [ ] are in millimeters.  
2.  
Center of Gravity includes economizer. Unit weight does not include  
economizer.  
3. Unit clearances:  
Top — Do not restrict condenser fans  
Control Box End — 6Ј-0Љ  
Sides — 6Ј-0Љ (except power exhaust units 10Ј-0Љ)  
Fig. 4D — Base Unit Dimensional Drawing; 50DJ,DK,NP054-074 Units  
14  
034 UNITS  
ROOF MOUNT DRAIN  
044-074 UNITS  
Fig. 5 — Drain Location Selection  
SLAB MOUNT DRAIN  
Fig. 8 — Condensate Drain Piping Details  
Fig. 6 — Condensate Drain Location  
Fig. 9 — Outdoor-Air Hood  
Fig. 7 — Seal Plate Location  
15  
Fig. 12 — Enthalpy Sensor Location  
Fig. 10 — Outdoor-Air Damper Adjustments  
(Inside of Hood Shown)  
CONTROL  
CONTROL  
CURVE  
POINT  
ENTHALPY  
SENSOR  
(Approx Deg)  
AT 50% RH  
A
B
C
D
73  
68  
63  
58  
Fig. 13 — Psychrometric Chart for  
Enthalpy Control  
Fig. 11 — Enthalpy Sensor  
16  
Field Wire Routing  
UNIT SIZES 034 AND 044 — Field wiring can be brought  
into the unit through the basepan and roof curb or through  
the corner post in the side of the unit next to the control box.  
A 3-1/2 in. NPT coupling for field power and a 3/4-in.  
NPT coupling for 24 v control wiring are provided in the  
basepan. There are two 4-5/8 in. knockouts in the corner post  
for field power wiring.  
If field power wiring is brought through the roof curb, route  
wiring out through one of the 4-5/8 in. knockouts to the field-  
supplied disconnect and then back into the unit through the  
other knockout. See Fig. 16 for recommended disconnect  
location.  
If power wiring is brought through the side of the unit,  
route wiring from field-supplied disconnect through top  
4-5/8 in. knockouts into unit.  
NOTES:  
1. Switches shown in high enthalpy state. Terminals 2 and 3 close  
on enthalpy decrease.  
2. When standard economizer is used with accessory differential en-  
thalpy sensor, set enthalpy control to ‘‘D’’ setting.  
If control wiring is to be brought in through the side of the  
unit, a 7/8-in. diameter hole must be drilled in the corner  
post next to the control box.  
Fig. 14 — Wiring Connections for Solid-State  
Enthalpy Sensor (HH57AC077)  
UNIT SIZES 054-074 — Field wiring is brought into the  
unit through the bottom of the control box. Wiring can be  
brought through the roof curb through field-supplied water-  
tight connections. See Fig. 17.  
A 4-5/32 in. hole for field power wiring and a 7/8-in. hole  
for 24 v control wiring are provided in the bottom of the  
control box. Field-supplied couplings must be used when rout-  
ing wiring into the control box.  
See Fig. 17 for recommended disconnect location.  
Field Electrical Connections  
IMPORTANT: The 48/50DK,DY,NB,NP units gener-  
ate, use, and can radiate radio frequency energy. If units  
are not installed and used in accordance with these  
instructions, they may cause radio interference. They  
have been tested and found to comply with limits of a  
Class A computing device as defined by FCC (Federal  
Communications Commission) regulations, Subpart J  
of Part 15, which are designed to provide reasonable  
protection against such interference when operated in  
a commercial environment.  
Fig. 15 — Mixed-Air Thermistor and Economizer  
Position Setting Adjustments  
(Top of Economizer Motor)  
Use care when drilling into corner post to avoid damage to con-  
denser coil.  
Fig. 16 — Disconnect Location, 034 and 044 Units  
(50 Series Vertical Discharge Unit Shown)  
17  
Use care when drilling into corner post to avoid damage to con-  
denser coil.  
Fig. 17 — Disconnect Location, 054-074 Units  
(50 Series Horizontal Discharge Shown)  
POWER WIRING — Units are factory wired for the voltage  
Use the following formula to determine the percent  
shown on the unit nameplate. The main terminal block is  
suitable for use with aluminum or copper wires. Maximum  
wire size is 3/0 AWG (American Wire Gage).  
voltage imbalance.  
% Voltage Imbalance  
max voltage deviation from average voltage  
average voltage  
= 100 x  
When installing units, provide a disconnect per NEC  
(National Electrical Code) of adequate size (MOCP [Maxi-  
mum Overcurrent Protection] of unit is on the informative  
plate). All field wiring must comply with NEC and all local  
codes. Size wire based on MCA (Minimum Circuit Amps)  
on the unit informative plate. See Fig. 18 for power wiring  
connections to the unit power terminal block and equipment  
ground.  
Operating voltage to the compressor must be within the  
voltage range indicated on the unit nameplate. Voltages be-  
tween phases must be balanced within 2%, and the current  
must be balanced within 10%. See Tables 3-7 for unit elec-  
trical data.  
Example: Supply voltage is 460-3-60.  
AB = 452 v  
BC = 464 v  
AC = 455 v  
452 ϩ 464 ϩ 455  
Average Voltage =  
3
1371  
=
=
3
457  
Determine maximum deviation from average voltage:  
(AB) 457 – 452 = 5 v  
(BC) 464 – 457 = 7 v  
(AC) 457 – 455 = 2 v  
Maximum deviation is 7 v.  
Determine percent voltage imbalance:  
7
% Voltage Imbalance = 100 x  
457  
= 1.53%  
This amount of phase imbalance is satisfactory as it is be-  
low the maximum allowable 2%.  
LEGEND  
IMPORTANT: If the supply voltage phase imbalance  
is more than 2%, contact local utility immediately.  
EQUIP  
GND  
NEC  
TB  
—
—
—
—
Equipment  
Ground  
National Electrical Code  
Terminal Block  
Unit failure as a result of operation on improper line volt-  
age or excessive phase imbalance constitutes abuse and may  
cause damage to electrical components.  
Fig. 18 — Field Power Wiring Connections  
18  
Table 3 — Electrical Data, 034 Units  
208/230-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Hp  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
175.9/172.5 225/225  
188.1/182.5 225/225  
203.1/196.5 250/225  
154.7/152.5 200/200  
227.4/255.0 250/300  
326.0/368.8 350/400  
175.9/172.5 225/225  
227.4/255.0 250/300  
—
—
29/ 36  
59/ 72  
88/108† 236.6/273.0  
78.9/ 91.0  
157.7/182.0  
—
—
—
—
6.0  
21.2/20.0 29/ 36  
21.2/20.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
24.2/ 154.7/  
22.0 152.5  
200/  
200  
7.5  
6.0  
6.0  
21.2/20.0 88/108† 236.6/ 273.0 326.0/368.8 350/400  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
33.4/30.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
188.1/182.5 225/225  
227.4/255.0 250/300  
326.0/368.8 350/400  
203.1/196.5 250/225  
227.4/255.0 250/300  
326.0/368.8 350/400  
33.4/30.0 88/108† 236.6/273.0  
48.4/44.0 29/ 36  
48.4/44.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
48.4/44.0 88/108† 236.6/273.0  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
182.5/178.5 225/225  
194.7/188.5 225/225  
209.7/202.5 250/250  
161.3/158.5 200/200  
235.6/262.5 250/300  
334.2/376.3 350/400  
182.5/178.5 225/225  
235.6/262.5 250/300  
334.2/376.3 350/400  
194.7/188.5 225/225  
235.6/262.5 250/300  
334.2/376.3 350/400  
209.7/202.5 250/250  
235.6/262.5 250/300  
334.2/376.3 350/400  
—
—
29/ 36  
59/ 72  
88/108† 236.6/273.0  
78.9/ 91.0  
157.7/182.0  
—
—
—
—
6.0  
21.2/20.0 29/ 36  
21.2/20.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
30.8/ 161.3/  
28.0 158.5  
200/  
200  
10.0  
15.0  
20.0  
6.0  
6.0  
21.2/20.0 88/108† 236.6/273.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
33.4/30.0 59/ 72  
33.4/30.0 88/108  
48.4/44.0 29/ 36  
48.4/44.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
236.6/273.0  
78.9/ 91.0  
157.7/182.0  
48.4/44.0 88/108† 236.6/273.0  
187-254  
53.2  
266.0  
53.2  
266.0  
10.8  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
197.9/192.5 250/225  
210.1/202.5 250/250  
225.1/216.5 250/250  
176.7/172.5 250/250  
254.9/280.0 300/350  
353.5/393.8 400/400  
197.9/192.5 250/250  
254.9/280.0 300/350  
353.5/393.8 400/400  
210.1/202.5 250/250  
254.9/280.0 300/350  
353.5/393.8 400/400  
225.1/216.5 250/250  
254.9/280.0 300/350  
353.5/393.8 400/400  
—
—
29/ 36  
59/ 72  
88/108† 236.6/273.0  
78.9/ 91.0  
157.7/182.0  
—
—
—
—
6.0  
21.2/20.0 29/ 36  
21.2/20.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
46.2/ 176.7/  
42.0 172.5  
225/  
225  
6.0  
6.0  
21.2/20.0 88/108† 236.6/273.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
33.4/30.0 59/ 72  
33.4/30.0 88/108  
48.4/44.0 29/ 36  
48.4/44.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
236.6/273.0  
78.9/ 91.0  
157.7/182.0  
48.4/44.0 88/108† 236.6/273.0  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
212.6/204.7 250/250  
224.8/214.7 250/250  
239.9/228.7 250/250  
191.4/184.7 300/300  
271.4/295.0 350/350  
370.0/408.8 450/450  
212.6/204.7 300/300  
271.4/295.0 350/350  
370.0/408.8 450/450  
224.8/214.7 300/300  
271.4/295.0 350/350  
370.0/408.8 450/450  
239.9/228.7 300/300  
271.4/295.0 350/350  
370.0/408.8 450/450  
—
—
29/ 36  
59/ 72  
88/108† 236.6/273.0  
78.9/ 91.0  
157.7/182.0  
—
—
—
—
6.0  
21.2/20.0 29/ 36  
21.2/20.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
59.4/ 191.4/  
54.0 184.7  
250/  
225  
6.0  
6.0  
21.2/20.0 88/108† 236.6/273.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
33.4/30.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
33.4/30.0 88/108† 236.6/273.0  
48.4/44.0 29/ 36  
48.4/44.0 59/ 72  
78.9/ 91.0  
157.7/182.0  
48.4/44.0 88/108† 236.6/273.0  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
19  
Table 3 — Electrical Data, 034 Units (cont)  
460-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
7.5  
FLA  
11.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
90.8  
96.4  
103.2  
81.2  
130.0  
187.5  
90.8  
130.0  
187.5  
96.4  
130.0  
187.5  
103.2  
130.0  
187.5  
110  
125  
125  
100  
150  
200  
110  
150  
200  
125  
150  
200  
125  
150  
200  
—
—
46.3  
93.0  
—
—
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
81.2  
84.2  
91.2  
97.2  
100  
110  
110  
125  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
93.8  
99.4  
106.2  
84.2  
133.7  
191.2  
93.8  
133.7  
191.2  
99.4  
133.7  
191.2  
106.2  
133.7  
191.2  
110  
125  
125  
110  
150  
200  
110  
150  
200  
125  
150  
200  
125  
150  
200  
—
—
46.3  
93.0  
—
—
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
10.0  
15.0  
20.0  
14.0  
21.0  
27.0  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
414-508  
28.8  
120.0  
28.8  
120.0  
5.4  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
100.8  
106.4  
113.2  
91.2  
125  
125  
125  
125  
175  
200  
125  
175  
200  
125  
175  
200  
125  
175  
200  
—
—
46.3  
93.0  
—
—
142.5  
200.0  
100.8  
142.5  
200.0  
106.4  
142.5  
200.0  
113.2  
142.5  
200.0  
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
106.8  
112.4  
119.2  
97.2  
125  
125  
125  
150  
200  
225  
150  
200  
225  
150  
200  
225  
150  
200  
225  
—
—
46.3  
93.0  
—
—
150.0  
207.5  
106.8  
150.0  
207.5  
112.4  
150.0  
207.5  
119.2  
150.0  
207.5  
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
20  
Table 3 — Electrical Data, 034 Units (cont)  
575-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
7.5  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
73.6  
78.0  
90  
100  
100  
80  
110  
150  
90  
110  
150  
100  
110  
150  
100  
110  
150  
—
—
—
83.8  
36  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
65.8  
—
—
72  
101.3  
146.2  
73.6  
—
—
108†  
36  
6.0  
7.8  
9.0  
65.8  
67.8  
73.8  
78.8  
80  
90  
90  
6.0  
7.8  
72  
101.3  
146.2  
78.0  
101.3  
146.2  
83.8  
101.3  
146.2  
6.0  
7.8  
108†  
36  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
72  
108†  
36  
72  
108†  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
75.6  
80.0  
90  
100  
100  
90  
110  
150  
90  
110  
150  
100  
110  
150  
100  
110  
150  
—
—
—
85.8  
36  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
67.8  
—
—
72  
103.7  
148.7  
75.6  
—
—
108†  
36  
6.0  
7.8  
10.0  
15.0  
20.0  
11.0  
17.0  
22.0  
6.0  
7.8  
72  
103.7  
148.7  
80.0  
103.7  
148.7  
85.8  
103.7  
148.7  
6.0  
7.8  
108†  
36  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
72  
108†  
36  
72  
108†  
518-632  
23.1  
96.0  
23.1  
96.0  
4.8  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
81.6  
86.0  
100  
100  
110  
100  
125  
175  
100  
125  
175  
100  
125  
175  
110  
125  
175  
—
—
—
91.8  
36  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
73.8  
—
—
72  
111.2  
156.2  
81.6  
—
—
108†  
36  
6.0  
7.8  
6.0  
7.8  
72  
111.2  
156.2  
86.0  
111.2  
156.2  
91.8  
111.2  
156.2  
6.0  
7.8  
108†  
36  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
72  
108†  
36  
72  
108†  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
86.6  
91.0  
100  
110  
110  
110  
150  
175  
110  
150  
175  
110  
150  
175  
110  
150  
175  
—
—
—
96.8  
36  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
36.0  
72.0  
108.0  
78.8  
—
—
72  
117.5  
162.5  
86.6  
—
—
108†  
36  
6.0  
7.8  
100  
6.0  
7.8  
72  
117.5  
162.5  
91.0  
117.5  
162.5  
96.8  
117.5  
162.5  
6.0  
7.8  
108†  
36  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
72  
108†  
36  
72  
108†  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
21  
Table 4 — Electrical Data, 044 Units  
208/230-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
7.5  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
—
—
217.3/213.9 250/250  
229.5/223.9 250/250  
244.5/237.9 300/300  
29/ 35  
78.9/ 91.0 196.1/193.9 250/250  
—
—
—
59/ 72 157.7/182.0 227.4/255.0 250/300  
88/108† 236.6/273.0 326.0/368.8 350/400  
—
6.0  
21.2/20.0 29/ 36  
78.9/ 91.0 217.3/213.9 250/250  
24.2/ 196.1/  
22.0 193.9  
250/  
250  
6.0  
21.2/20.0 59/ 72 157.7/182.0 227.4/255.0 250/300  
21.2/20.0 88/108† 236.6/273.0 326.0/368.8 350/400  
6.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
78.9/ 91.0 229.5/223.9 250/250  
33.4/30.0 59/ 72 157.7/182.0 229.5/255.0 250/300  
33.4/30.0 88/108† 236.6/273.0 326.0/368.8 350/400  
48.4/44.0 29/ 36  
78.9/ 91.0 244.5/237.9 300/300  
48.4/44.0 59/ 72 157.7/182.0 244.5/255.0 300/300  
48.4/44.0 88/108† 236.6/273.0 326.0/368.8 350/400  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
—
223.9/219.9 250/250  
236.1/229.9 300/250  
251.1/243.9 300/300  
—
29/ 36  
78.9/ 91.0 202.7/199.9 250/250  
—
—
59/ 72 157.7/182.0 235.6/262.5 250/300  
88/108† 236.6/273.0 334.2/376.3 350/400  
—
—
6.0  
21.2/20.0 29/ 36  
78.9/ 91.0 223.9/219.9 250/250  
30.8/ 202.7/  
28.0 199.9  
250/  
250  
10.0  
15.0  
20.0  
6.0  
21.2/20.0 59/ 72 157.7/182.0 235.6/262.5 250/300  
21.2/20.0 88/108† 236.6/273.0 334.2/376.3 350/400  
6.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
78.9/ 91.0 236.1/229.9 300/250  
33.4/30.0 59/ 72 157.7/182.0 236.1/262.5 300/300  
33.4/30.0 88/108† 236.6/273.0 334.2/376.3 350/400  
48.4/44.0 29/ 36  
78.9/ 91.0 251.1/243.9 300/300  
48.4/44.0 59/ 72 157.7/182.0 251.1/262.5 300/300  
48.4/44.0 88/108† 236.6/273.0 334.2/376.3 350/400  
187-254  
69.2  
345.0  
69.2  
345.0  
16.2  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
—
239.3/233.9 300/300  
251.5/243.9 300/300  
266.5/257.9 300/300  
—
29/ 36  
78.9/ 91.0 218.1/213.9 250/250  
—
—
59/ 72 157.7/182.0 254.9/280.0 300/350  
88/108† 236.6/273.0 353.5/393.8 400/400  
—
—
6.0  
21.2/20.0 29/ 36  
78.9/ 91.0 239.3/233.9 300/300  
46.2/ 218.1/  
42.0 213.9  
250/  
250  
6.0  
21.2/20.0 59/ 72 157.7/182.0 254.9/280.0 300/350  
21.2/20.0 88/108† 236.6/273.0 353.5/393.8 400/400  
6.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
78.9/ 91.0 251.5/243.9 300/300  
33.4/30.0 59/ 72 157.7/182.0 254.9/280.0 300/350  
33.4/30.0 88/108† 236.6/273.0 353.5/393.8 400/400  
48.4/44.0 29/ 36  
78.9/ 91.0 266.5/257.9 300/300  
48.4/44.0 59/ 72 157.7/182.0 266.5/280.0 300/350  
48.4/44.0 88/108† 236.6/273.0 353.5/393.8 400/400  
6.0  
10.0  
15.0  
—
21.2/20.0  
33.4/30.0  
48.4/44.0  
—
—
—
—
—
—
252.5/245.9 300/300  
264.7/255.9 300/300  
279.7/269.9 300/300  
—
29/ 36  
78.9/ 91.0 231.3/225.9 300/300  
—
—
59/ 72 157.7/182.0 271.4/295.0 350/350  
88/108† 236.6/273.0 370.0/408.8 450/450  
—
—
6.0  
21.2/20.0 29/ 36  
78.9/ 91.0 252.5/245.9 300/300  
59.4/ 231.3/  
54.0 225.9  
300/  
250  
6.0  
21.2/20.0 59/ 72 157.7/182.0 271.4/295.0 350/350  
21.2/20.0 88/108† 236.6/273.0 370.0/408.8 450/450  
6.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
33.4/30.0 29/ 36  
78.9/ 91.0 264.7/255.9 300/300  
33.4/30.0 59/ 72 157.7/182.0 271.4/295.0 350/350  
33.4/30.0 88/108† 236.6/273.0 370.0/408.8 450/450  
48.4/44.0 29/ 36  
78.9/ 91.0 279.7/269.9 300/300  
48.4/44.0 59/ 72 157.7/182.0 279.7/295.0 350/350  
48.4/44.0 88/108† 236.6/273.0 370.0/408.8 450/450  
22  
Table 4 — Electrical Data, 044 Units (cont)  
460-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
7.5  
FLA  
11.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
106.5  
112.1  
118.9  
96.9  
125  
125  
150  
125  
150  
200  
125  
150  
200  
125  
150  
200  
150  
150  
200  
—
—
46.3  
93.0  
—
—
130.0  
187.5  
106.5  
130.0  
187.5  
112.1  
130.0  
187.5  
118.9  
130.0  
187.5  
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
96.9  
125  
125  
125  
125  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
109.5  
115.1  
121.9  
99.9  
125  
125  
150  
125  
150  
200  
125  
150  
200  
125  
150  
200  
150  
150  
200  
—
—
46.3  
93.0  
—
—
133.7  
191.2  
109.5  
133.7  
191.2  
115.1  
133.7  
191.2  
121.9  
133.7  
191.2  
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
10.0  
15.0  
20.0  
14.0  
21.0  
27.0  
99.9  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
414-508  
34.6  
173.0  
34.6  
173.0  
8.1  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
116.5  
122.1  
128.9  
106.9  
142.5  
200.0  
116.5  
142.5  
200.0  
122.1  
142.5  
200.0  
128.9  
142.5  
200.0  
150  
150  
150  
125  
175  
200  
150  
175  
200  
150  
175  
200  
150  
175  
200  
—
—
46.3  
93.0  
—
—
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
106.9  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
6.0  
10.0  
15.0  
—
9.6  
15.2  
22.0  
—
—
—
—
36  
72  
—
122.5  
128.1  
134.9  
112.9  
150.0  
207.5  
122.5  
150.0  
207.5  
128.1  
150.0  
207.5  
134.9  
150.0  
207.5  
150  
150  
150  
150  
200  
225  
150  
200  
225  
150  
200  
225  
150  
200  
225  
—
—
46.3  
93.0  
—
—
—
—
108† 139.0  
6.0  
9.6  
36  
72  
46.3  
93.0  
112.9  
6.0  
9.6  
6.0  
9.6  
108† 139.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
23  
Table 4 — Electrical Data, 044 Units (cont)  
575-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
7.5  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
36  
72  
—
84.1  
88.5  
110  
110  
110  
100  
110  
150  
110  
110  
150  
110  
110  
150  
110  
110  
150  
—
—
94.3  
36.0  
72.0  
76.3  
—
—
101.3  
146.2  
84.1  
—
—
108† 108.0  
6.0  
7.8  
36  
72  
36.0  
72.0  
9.0  
76.3  
78.3  
84.3  
89.3  
100  
100  
110  
110  
6.0  
7.8  
101.3  
146.2  
88.5  
101.3  
146.2  
94.3  
101.3  
146.2  
6.0  
7.8  
108† 108.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
36  
72  
—
86.1  
90.5  
110  
110  
110  
100  
110  
150  
110  
110  
150  
110  
110  
150  
110  
110  
150  
—
—
96.3  
36.0  
72.0  
78.3  
—
—
103.7  
148.7  
86.1  
—
—
108† 108.0  
6.0  
7.8  
36  
72  
36.0  
72.0  
10.0  
15.0  
20.0  
11.0  
17.0  
22.0  
6.0  
7.8  
103.7  
148.7  
90.5  
103.7  
148.7  
96.3  
103.7  
148.7  
6.0  
7.8  
108† 108.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
518-632  
26.7  
120.0  
26.7  
120.0  
7.2  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
36  
72  
—
92.1  
96.5  
102.3  
84.3  
111.2  
156.2  
92.1  
111.2  
156.2  
96.5  
111.2  
156.2  
102.3  
111.2  
156.2  
110  
110  
125  
110  
125  
175  
110  
125  
175  
110  
125  
175  
125  
125  
175  
—
—
36.0  
72.0  
—
—
—
—
108† 108.0  
6.0  
7.8  
36  
72  
36.0  
72.0  
6.0  
7.8  
6.0  
7.8  
108† 108.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
6.0  
10.0  
15.0  
—
7.8  
12.2  
18.0  
—
—
—
—
36  
72  
—
97.1  
101.5  
107.3  
89.3  
117.5  
162.5  
97.1  
117.5  
162.5  
101.5  
117.5  
162.5  
107.3  
117.5  
162.5  
110  
125  
125  
110  
150  
175  
110  
150  
175  
125  
150  
175  
125  
150  
175  
—
—
36.0  
72.0  
—
—
—
—
108† 108.0  
6.0  
7.8  
36  
72  
36.0  
72.0  
6.0  
7.8  
6.0  
7.8  
108† 108.0  
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
24  
Table 5 — Electrical Data, 054 Units  
208/230-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Hp  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
310.2/303.0 400/400  
325.2/316.6 400/400  
338.4/238.6 400/400  
—
29/ 36  
78.9/ 91.0 276.8/272.6 350/350  
—
—
59/ 72 157.7/182.0 276.8/280.0 350/350  
88/108† 236.6/273.0 353.5/393.8 400/400  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 310.2/303.0 400/400  
46.2/ 276.8/  
42.0 272.6  
350/  
350  
15.0  
33.4/30.4 59/ 72 157.7/182.0 310.2/303.0 400/400  
33.4/30.4 88/108† 236.6/273.0 353.5/393.8 400/400  
48.4/44.0 29/ 36  
78.9/ 91.0 325.2/316.6 400/400  
48.4/44.0 59/ 72 157.7/182.0 325.2/316.6 400/400  
48.4/44.0 88/108† 236.6/273.0 353.5/393.8 400/400  
61.6/56.0 29/ 36  
78.9/ 91.0 338.4/328.6 400/400  
61.6/56.0 59/ 72 157.7/182.0 338.4/328.6 400/400  
61.6/56.0 88/108† 236.6/273.0 353.5/393.8 400/400  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
323.4/315.0 400/400  
338.4/328.6 400/400  
351.6/340.6 450/400  
—
29/ 36  
78.9/ 91.0 290.0/284.6 350/350  
—
—
59/ 72 157.7/182.0 290.0/295.0 350/350  
88/108† 236.6/273.0 370.0/408.8 450/450  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 323.4/315.0 400/400  
59.4/ 290.0/  
54.0 284.6  
350/  
350  
20.0  
25.0  
30.0  
33.4/30.4 59/ 72 157.7/182.0 323.4/315.0 400/400  
33.4/30.4 88/108† 236.6/273.0 370.0/408.8 450/450  
48.4/44.0 29/ 36  
78.9/ 91.0 338.4/328.6 400/400  
48.4/44.0 59/ 72 157.7/182.0 338.4/328.6 400/400  
48.4/44.0 88/108† 236.6/273.0 370.0/408.8 450/450  
61.6/56.0 29/ 36  
78.9/ 91.0 351.6/340.6 450/400  
61.6/56.0 59/ 72 157.7/182.0 351.6/340.6 450/400  
61.6/56.0 88/108† 236.6/273.0 370.0/408.8 450/450  
187-254  
107.7 506.0  
74.4  
345.0  
21.6  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
338.8/329.0 400/400  
353.8/342.6 450/450  
367.0/354.6 450/450  
—
29/ 36  
78.9/ 91.0 305.4/298.6 400/400  
—
—
59/ 72 157.7/182.0 305.4/312.5 450/450  
88/108† 236.6/273.0 389.3/426.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 338.8/329.0 400/400  
74.8/ 305.4/  
68.0 298.6  
400/  
400  
33.4/30.4 59/ 72 157.7/182.0 338.8/329.0 450/450  
33.4/30.4 88/108† 236.6/273.0 389.3/426.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 353.8/342.6 450/450  
48.4/44.0 59/ 72 157.7/182.0 353.8/342.6 450/450  
48.4/44.0 88/108† 236.6/273.0 389.3/426.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 367.0/354.6 450/450  
61.6/56.0 59/ 72 157.7/182.0 367.0/354.6 450/450  
61.6/56.0 88/108† 236.6/273.0 389.3/426.3 500/500  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
352.0/341.0 450/400  
367.0/354.6 450/450  
380.2/366.6 450/450  
—
29/ 36  
78.9/ 91.0 318.6/310.6 400/400  
—
—
59/ 72 157.7/182.0 318.6/327.5 500/500  
88/108† 236.6/273.0 405.7/441.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 352.0/341.0 450/400  
88.0/ 318.6/  
80.0 310.6  
400/  
400  
33.4/30.4 59/ 72 157.7/182.0 352.0/341.0 500/500  
33.4/30.4 88/108† 236.6/273.0 405.7/441.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 367.0/354.6 450/450  
48.4/44.0 59/ 72 157.7/182.0 367.0/354.6 500/500  
48.4/44.0 88/108† 236.6/273.0 405.7/441.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 380.2/366.6 450/450  
61.6/56.0 59/ 72 157.7/182.0 380.2/366.6 500/500  
61.6/56.0 88/108† 236.6/273.0 405.7/441.3 500/500  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
25  
Table 5 — Electrical Data, 054 Units (cont)  
460-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
21.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
144.8  
151.6  
157.6  
129.6  
142.5  
200.0  
144.8  
144.8  
200.0  
151.6  
151.6  
200.0  
157.6  
157.6  
200.0  
175  
200  
200  
175  
175  
200  
175  
175  
200  
200  
200  
200  
200  
200  
200  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
15.0  
129.6  
135.6  
142.6  
148.6  
175  
175  
175  
175  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
150.8  
157.6  
163.6  
135.6  
150.0  
207.5  
150.8  
150.8  
207.5  
157.6  
157.6  
207.5  
163.6  
163.6  
207.5  
200  
200  
200  
175  
200  
225  
200  
200  
225  
200  
200  
225  
200  
200  
225  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
20.0  
25.0  
30.0  
27.0  
34.0  
40.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
414-508  
50.6  
253.0  
34.6  
173.0  
10.8  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
157.8  
164.6  
170.6  
142.6  
158.7  
216.3  
157.8  
158.7  
216.3  
164.6  
164.6  
216.3  
170.6  
170.6  
216.3  
200  
200  
200  
175  
225  
250  
200  
225  
250  
200  
225  
250  
200  
225  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
163.8  
170.6  
176.6  
148.6  
166.2  
223.7  
163.8  
166.2  
223.7  
170.6  
170.6  
223.7  
176.6  
176.6  
223.7  
200  
200  
225  
200  
250  
250  
200  
250  
250  
200  
250  
250  
225  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
26  
Table 5 — Electrical Data, 054 Units (cont)  
575-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
17.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
116.5  
122.3  
126.3  
104.3  
111.2  
156.2  
116.5  
116.5  
156.2  
122.3  
122.3  
156.2  
126.3  
126.3  
156.2  
150  
150  
150  
125  
125  
175  
150  
150  
175  
150  
150  
175  
150  
150  
175  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
15.0  
104.3  
109.3  
114.3  
119.3  
125  
125  
150  
150  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
121.5  
127.3  
131.3  
109.3  
117.5  
162.5  
121.5  
121.5  
162.5  
127.3  
127.3  
162.5  
131.3  
131.3  
162.5  
150  
150  
150  
125  
150  
175  
150  
150  
175  
150  
150  
175  
150  
150  
175  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
20.0  
25.0  
30.0  
22.0  
27.0  
32.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
518-632  
39.1  
176.0  
28.8  
120.0  
9.6  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
126.5  
132.3  
136.3  
114.3  
123.7  
168.7  
126.5  
126.5  
168.7  
132.3  
132.3  
168.7  
136.3  
136.3  
168.7  
150  
150  
175  
150  
175  
200  
150  
175  
200  
150  
175  
200  
175  
175  
200  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
131.5  
137.3  
141.3  
119.3  
130.0  
175.0  
131.5  
131.5  
175.0  
137.3  
137.3  
175.0  
141.3  
141.3  
175.0  
150  
175  
175  
150  
200  
225  
150  
200  
225  
175  
200  
225  
175  
200  
225  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
27  
Table 6 — Electrical Data, 064 Units  
208/230-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Hp  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
343.5/336.3 450/400  
358.5/349.9 450/450  
371.7/361.9 450/450  
—
29/ 36  
78.9/ 91.0 310.1/305.9 400/400  
—
—
59/ 72 157.7/182.0 310.1/305.9 400/400  
88/108† 236.6/273.0 353.5/393.8 400/400  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 343.5/336.3 450/400  
46.2/ 310.1/  
42.0 305.9  
400/  
400  
15.0  
33.4/30.4 59/ 72 157.7/182.0 343.5/336.3 450/400  
33.4/30.4 88/108† 236.6/273.0 353.5/393.8 450/400  
48.4/44.0 29/ 36  
78.9/ 91.0 358.5/349.9 450/450  
48.4/44.0 59/ 72 157.7/182.0 358.5/349.9 450/450  
48.4/44.0 88/108† 236.6/273.0 358.5/393.8 450/450  
61.6/56.0 29/ 36  
78.9/ 91.0 371.7/361.9 450/450  
61.6/56.0 59/ 72 157.7/182.0 371.7/361.9 450/450  
61.6/56.0 88/108† 236.6/273.0 371.7/393.8 450/450  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/66.0  
—
—
—
—
—
—
356.7/348.3 450/450  
371.7/361.9 450/450  
384.9/373.9 450/450  
—
29/ 36  
78.9/ 91.0 323.3/317.9 400/400  
—
—
59/ 72 157.7/182.0 323.3/317.9 400/400  
88/108† 236.6/273.0 370.0/408.8 450/450  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 356.7/348.3 450/450  
59.4/ 323.3/  
54.0 317.9  
400/  
400  
20.0  
25.0  
30.0  
33.4/30.4 59/ 72 157.7/182.0 356.7/348.3 450/450  
33.4/30.4 88/108† 236.6/273.0 370.0/408.8 450/450  
48.4/44.0 29/ 36  
78.9/ 91.0 371.7/361.9 450/450  
48.4/44.0 59/ 72 157.7/182.0 371.7/361.9 450/450  
48.4/44.0 88/108† 236.6/273.0 371.7/408.8 450/450  
61.6/56.0 29/ 36  
78.9/ 91.0 384.9/373.9 450/450  
61.6/56.0 59/ 72 157.7/182.0 384.9/373.9 450/450  
61.6/56.0 88/108† 236.6/273.0 384.9/408.8 450/450  
187-254  
107.7 506.0 107.0 506.0  
21.6  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
372.1/362.3 450/450  
387.1/375.9 450/450  
400.3/387.9 500/450  
—
29/ 36  
78.9/ 91.0 338.7/331.9 400/400  
—
—
59/ 72 157.7/182.0 338.7/331.9 450/450  
88/108† 236.6/273.0 389.3/426.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 372.1/362.3 450/450  
74.8/ 338.7/  
68.0 331.9  
400/  
400  
33.4/30.4 59/ 72 157.7/182.0 372.1/362.3 450/450  
33.4/30.4 88/108† 236.6/273.0 389.3/426.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 387.1/375.9 450/450  
48.4/44.0 59/ 72 157.7/182.0 387.1/375.9 450/450  
48.4/44.0 88/108† 236.6/273.0 389.3/426.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 400.3/387.9 500/450  
61.6/56.0 59/ 72 157.7/182.0 400.3/387.9 500/450  
61.6/56.0 88/108† 236.6/273.0 400.3/426.3 500/500  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
385.3/374.3 450/450  
400.3/387.9 500/450  
413.5/399.9 500/500  
—
29/ 36  
78.9/ 91.0 351.9/343.9 450/450  
—
—
59/ 72 157.7/182.0 351.9/343.9 500/500  
88/108† 236.6/273.0 405.7/441.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 385.3/374.3 450/450  
88.0/ 351.9/  
80.0 343.9  
450/  
450  
33.4/30.4 59/ 72 157.7/182.0 385.3/374.3 500/500  
33.4/30.4 88/108† 236.6/273.0 405.7/441.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 400.3/387.9 500/450  
48.4/44.0 59/ 72 157.7/182.0 400.3/387.9 500/500  
48.4/44.0 88/108† 236.6/273.0 405.7/441.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 413.5/399.9 500/500  
61.6/56.0 59/ 72 157.7/182.0 413.5/399.9 500/500  
61.6/56.0 88/108† 236.6/273.0 413.5/441.3 500/500  
28  
Table 6 — Electrical Data, 064 Units (cont)  
460-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
21.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
160.8  
167.6  
173.6  
145.6  
145.6  
200.0  
160.8  
160.8  
200.0  
167.6  
167.6  
200.0  
173.6  
173.6  
200.0  
200  
200  
200  
175  
175  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
15.0  
145.6  
151.6  
158.6  
164.6  
175  
200  
200  
200  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
166.8  
173.6  
179.6  
151.6  
151.6  
207.5  
166.8  
166.8  
207.5  
173.6  
173.6  
207.5  
179.6  
179.6  
207.5  
200  
200  
225  
200  
200  
225  
200  
200  
225  
200  
200  
225  
225  
225  
225  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
20.0  
25.0  
30.0  
27.0  
34.0  
40.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
414-508  
50.6  
253.0  
50.6  
253.0  
10.8  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
173.8  
180.6  
186.6  
158.6  
158.7  
216.3  
173.8  
173.8  
216.3  
180.6  
180.6  
216.3  
186.6  
186.6  
216.3  
200  
225  
225  
200  
225  
250  
200  
225  
250  
225  
225  
250  
225  
225  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
179.8  
186.6  
192.6  
164.6  
166.2  
223.7  
179.8  
179.8  
223.7  
186.6  
186.6  
223.7  
192.6  
192.6  
223.7  
225  
225  
225  
200  
250  
250  
225  
250  
250  
225  
250  
250  
225  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
29  
Table 6 — Electrical Data, 064 Units (cont)  
575-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
17.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
126.8  
132.6  
136.6  
114.6  
114.6  
156.2  
126.8  
126.8  
156.2  
132.6  
132.6  
156.2  
136.6  
136.6  
156.2  
150  
150  
175  
150  
150  
175  
150  
150  
175  
150  
150  
175  
175  
175  
175  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
15.0  
114.6  
119.6  
124.6  
129.6  
150  
150  
150  
150  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
131.8  
137.6  
141.6  
119.6  
119.6  
162.5  
131.8  
131.8  
162.5  
137.6  
137.6  
162.5  
141.6  
141.6  
162.5  
150  
175  
175  
150  
150  
175  
150  
150  
175  
175  
175  
175  
175  
175  
175  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
20.0  
25.0  
30.0  
22.0  
27.0  
32.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
518-632  
39.1  
176.0  
39.1  
176.0  
9.6  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
136.8  
142.6  
146.6  
124.6  
124.6  
168.7  
136.8  
136.8  
168.7  
142.6  
142.6  
168.7  
146.6  
146.6  
168.7  
175  
175  
175  
150  
175  
200  
175  
175  
200  
175  
175  
200  
175  
175  
200  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
141.8  
147.6  
151.6  
129.6  
130.0  
175.0  
141.8  
141.8  
175.0  
147.6  
147.6  
175.0  
151.6  
151.6  
175.0  
175  
175  
175  
150  
200  
225  
175  
200  
225  
175  
200  
225  
175  
200  
225  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
30  
Table 7 — Electrical Data, 074 Units  
208/230-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Hp  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
392.2/385.0 500/500  
407.2/398.6 500/500  
420.4/410.6 500/500  
—
29/ 36  
78.9/ 91.0 358.8/354.6 500/450  
—
—
59/ 72 157.7/182.0 358.8/354.6 500/450  
88/108† 236.6/273.0 358.8/393.8 500/450  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 392.2/385.0 500/500  
46.2/ 358.8/  
42.0 854.6  
500/  
450  
15.0  
33.4/30.4 59/ 72 157.7/182.0 392.2/385.0 500/500  
33.4/30.4 88/108† 236.6/273.0 392.2/393.8 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 407.2/398.6 500/500  
48.4/44.0 59/ 72 157.7/182.0 407.2/398.6 500/500  
48.4/44.0 88/108† 236.6/273.0 407.2/398.6 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 420.4/410.6 500/500  
61.6/56.0 59/ 72 157.7/182.0 420.4/410.6 500/500  
61.6/56.0 88/108† 236.6/273.0 420.4/410.6 500/500  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
405.4/397.0 500/500  
420.4/410.6 500/500  
433.6/422.6 500/500  
—
29/ 36  
78.9/ 91.0 372.0/366.6 500/500  
—
—
59/ 72 157.7/182.0 372.0/366.6 500/500  
88/108† 236.6/273.0 372.0/408.8 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 405.4/397.0 500/500  
59.4/ 372.0/  
64.0 366.6  
500/  
500  
20.0  
25.0  
30.0  
33.4/30.4 59/ 72 157.7/182.0 405.4/397.0 500/500  
33.4/30.4 88/108† 236.6/273.0 405.4/408.8 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 420.4/410.6 500/500  
48.4/44.0 59/ 72 157.7/182.0 420.4/410.6 500/500  
48.4/44.0 88/108† 236.6/273.0 420.4/410.6 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 433.6/422.6 500/500  
61.6/56.0 59/ 72 157.7/182.0 433.6/422.6 500/500  
61.6/56.0 88/108† 236.6/273.0 433.6/422.6 500/500  
187-254  
107.7 506.0 142.3 690.0  
27.8  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
420.8/411.0 500/500  
435.8/424.6 500/500  
449.0/436.6 500/500  
—
29/ 36  
78.9/ 91.0 387.4/380.6 500/500  
—
—
59/ 72 157.7/182.0 387.4/380.6 500/500  
88/108† 236.6/273.0 389.3/426.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 420.8/411.0  
500/500  
500/500  
74.8/ 387.4/  
68.0 380.6  
500/  
500  
33.4/30.4 59/ 72 157.7/182.0 420.8/411.0  
33.4/30.4 88/108† 236.6/273.0 420.8/426.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 435.8/424.6 500/500  
48.4/44.0 59/ 72 157.7/182.0 435.8/424.6 500/500  
48.4/44.0 88/108† 236.6/273.0 435.8/426.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 449.0/436.6 500/500  
61.6/56.0 59/ 72 157.7/182.0 449.0/436.6 500/500  
61.6/56.0 88/108† 236.6/273.0 449.0/436.6 500/500  
10.0  
15.0  
20.0  
—
33.4/30.4  
48.4/44.0  
61.6/56.0  
—
—
—
—
—
—
434.0/423.0 500/500  
449.0/436.6 500/500  
462.2/448.6 600/500  
—
29/ 36  
78.9/ 91.0 400.6/392.6 500/500  
—
—
59/ 72 157.7/182.0 400.6/392.6 500/500  
88/108† 236.6/273.0 405.7/441.3 500/500  
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
33.4/30.4 29/ 36  
78.9/ 91.0 434.0/423.0 500/500  
88.0/ 400.6/  
80.0 392.6  
500/  
500  
33.4/30.4 59/ 72 157.7/182.0 434.0/423.0 500/500  
33.4/30.4 88/108† 236.6/273.0 434.0/441.3 500/500  
48.4/44.0 29/ 36  
78.9/ 91.0 449.0/436.6 500/500  
48.4/44.0 59/ 72 157.7/182.0 449.0/436.6 500/500  
48.4/44.0 88/108† 236.6/273.0 449.0/441.3 500/500  
61.6/56.0 29/ 36  
78.9/ 91.0 462.2/448.6 600/500  
61.6/56.0 59/ 72 157.7/182.0 462.2/448.6 600/500  
61.6/66.0 88/108† 236.6/273.0 462.2/448.6 600/500  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To  
determine heater capacity (kW) at unit operating voltage, multiply 240 v,  
480 v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
31  
Table 7 — Electrical Data, 074 Units (cont)  
460-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
21.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
182.0  
188.8  
194.8  
166.8  
166.8  
200.0  
182.0  
182.0  
200.0  
188.8  
188.8  
200.0  
194.8  
194.8  
200.0  
225  
250  
250  
225  
225  
225  
225  
225  
225  
250  
250  
250  
250  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
15.0  
166.8  
172.8  
179.8  
185.8  
225  
225  
225  
250  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
188.0  
194.8  
200.8  
172.8  
172.8  
207.5  
188.0  
188.0  
207.5  
194.8  
194.8  
207.5  
200.8  
200.8  
207.5  
250  
250  
250  
225  
225  
225  
250  
250  
250  
250  
250  
250  
250  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
20.0  
25.0  
30.0  
27.0  
34.0  
40.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
414-508  
50.6  
253.0  
65.4  
345.0  
13.5  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
195.0  
201.8  
207.8  
179.8  
179.8  
216.3  
195.0  
195.0  
216.3  
201.8  
201.8  
216.3  
207.8  
207.8  
216.3  
250  
250  
250  
225  
225  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
15.2  
22.0  
28.0  
—
—
—
15.2  
15.2  
15.2  
22.0  
22.0  
22.0  
28.0  
28.0  
28.0  
—
—
—
36  
72  
—
201.0  
207.8  
213.8  
185.8  
185.8  
223.7  
201.0  
201.0  
223.7  
207.8  
207.8  
223.7  
213.8  
213.8  
223.7  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
250  
—
—
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
36  
72  
46.3  
93.0  
108† 139.0  
32  
Table 7 — Electrical Data, 074 Units (cont)  
575-3-60 (V-Ph-Hz)  
BASE UNIT WITH  
EXHAUST FAN  
AND/OR  
COMPR  
NO. 1  
COMPR  
NO. 2  
BASE UNIT  
ONLY  
EXHAUST  
FAN  
ELECTRIC  
HEAT*  
OFM  
IFM  
VOLTAGE  
RANGE  
ELECTRIC HEAT*  
Total  
FLA  
Total  
Total  
FLA  
RLA  
LRA  
RLA  
LRA  
Hp  
FLA  
17.0  
MCA  
MOCP  
kW  
FLA  
MCA  
MOCP  
Hp  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
146.0  
151.8  
155.8  
133.8  
133.8  
156.2  
146.0  
146.0  
156.2  
151.8  
151.8  
156.2  
155.8  
155.8  
156.2  
175  
200  
200  
175  
175  
175  
175  
175  
175  
200  
200  
200  
200  
200  
200  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
15.0  
133.8  
138.8  
143.8  
148.8  
175  
175  
175  
200  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
151.0  
156.8  
160.8  
138.8  
138.8  
162.5  
151.0  
151.0  
162.5  
156.8  
156.8  
162.5  
160.8  
160.8  
162.5  
200  
200  
200  
175  
175  
175  
200  
200  
200  
200  
200  
200  
200  
200  
200  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
20.0  
25.0  
30.0  
22.0  
27.0  
32.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
518-632  
39.1  
176.0  
52.6  
276.0  
12.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
156.0  
161.8  
165.8  
143.8  
143.8  
168.7  
156.0  
156.0  
168.7  
161.8  
161.8  
168.7  
165.8  
165.8  
168.7  
200  
200  
200  
175  
175  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
10.0  
15.0  
20.0  
—
—
—
10.0  
10.0  
10.0  
15.0  
15.0  
15.0  
20.0  
20.0  
20.0  
12.2  
18.0  
22.0  
—
—
—
12.2  
12.2  
12.2  
18.0  
18.0  
18.0  
22.0  
22.0  
22.0  
—
—
—
36  
72  
—
161.0  
166.8  
170.8  
148.8  
148.8  
175.0  
161.0  
161.0  
175.0  
166.8  
166.8  
175.0  
170.8  
170.8  
175.0  
200  
200  
200  
200  
200  
225  
200  
200  
225  
200  
200  
225  
200  
200  
225  
—
—
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
36  
72  
36.0  
72.0  
108† 108.0  
NOTES:  
LEGEND  
1. Electric resistance heaters are rated at 208/240 v, 480 v, or 575 v. To de-  
termine heater capacity (kW) at unit operating voltage, multiply 240 v, 480  
v, or 575 v capacity by appropriate multiplier below.  
CV  
—
—
—
—
—
—
—
—
—
—
Constant Volume  
ETL  
FLA  
Hp  
ETL Testing Laboratory  
Full Load Amps  
Nominal Horsepower  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
MULTIPLICATION FACTORS  
IFM  
LRA  
MCA  
MOCP  
OFM  
RLA  
VOLTAGE  
DISTRIBUTION  
V-3-60  
HEATER kW  
RATING  
MULTIPLICATION  
FACTOR  
200  
208  
230  
240  
0.694  
0.751  
0.918  
1.000  
240  
*Electric heat available on 50 Series vertical discharge units.  
†108 kW available on CV applications only.  
440  
460  
480  
550  
575  
600  
0.840  
0.918  
1.000  
0.915  
1.000  
1.089  
480  
575  
Electric heaters are tested and ETL approved at maximum  
total external static pressure of 1.9 in. wg.  
2. Boldface indicates 48 and 50 Series units. All other data is for 50 Series  
units only.  
33  
CONTROL WIRING — Install a Carrier-approved acces-  
sory 24-v thermostat assembly according to the installation  
instructions shipped with the accessory. Locate thermostat  
assembly to sense average temperature. Route thermostat cable  
or equivalent leads of colored wire from subbase terminals  
to terminal board (P1). The terminal board (P1) is located on  
the constant volume control board on units with no econo-  
mizer and on the economizer board on units with the econo-  
mizer option.  
Total wire lengths should not exceed the following limits:  
50 ft of 18 AWG, 80 ft of 16 AWG or 125 ft of 14 AWG. See  
Fig. 19 for field wiring connections between the thermostat  
and the unit 24-v terminal block. Once wire length from unit  
to thermostat is determined, the length should be doubled to  
obtain total wire length required. Voltage drop is dependent  
on length of current path.  
There are no required 115-v field wiring connections, there-  
fore no provisions have been made in the unit for running  
115-v wiring. If any of the field-installed options requiring  
115-v connections are desired, the unit must be modified in  
the field for 115-v wiring.  
Fig. 19 — Field Control Thermostat Wiring  
Options requiring 24-v or 115-v control wiring are listed  
below.  
TB2 and the C1 connection on the evaporator-fan con-  
tactor coil (IFC on unit label diagram).  
5. Switch to isolate evaporator-fan motor (field-supplied  
normally-closed switch 5).  
Building Pressurization or Smoke Purge Mode — Refer to  
appropriate unit Controls and Troubleshooting literature as  
necessary for additional information. See Fig. 20 and unit  
wiring label for wiring details.  
1. Firestat or smoke detector (field-supplied normally-  
closed switch 1) — Remove factory-installed jumper wire  
and wire a field-supplied firestat or smoke detector con-  
tactor between terminals 5 and 6 (034-044 units) or ter-  
minals 2 and 3 (054-074 units) on terminal block 2 in the  
unit control box.  
2. Switch to drive economizer outdoor-air damper fully open  
(field-supplied normally-open switch 2) — Wire a field-  
supplied switch between terminals 8 and 9 on econo-  
mizer motor no. 1. When this switch is manually closed,  
it will drive the outdoor-air damper fully open.  
3. Switch to disconnect power to economizer motors (field-  
supplied normally-closed switch 3) — Wire a field-  
supplied switch between terminal C on the economizer  
motor and Plug 8, Pin 2 (PL8-2).  
4. Building pressurization switch (field-supplied normally-  
open switch 4) — Wire a field-supplied switch between  
Modulating Power Exhaust — Wire a field-supplied switch  
in series with the black wire removed from TRAN3  
primary.  
Constant Volume Power Exhaust — Wire a field-supplied  
switch in series with the black wire from Plug 7, Pin 1  
(PL7-1) to the red wire on economizer motor no. 2 (DMS1  
on unit label diagram).  
6. Switch to energize power exhaust motor (field-supplied  
normally-open switch 6) — Wire a field-supplied switch  
from terminal 5 (on 034-044 units) or terminal 2 (054-  
074 units) on terminal block 2 in series with the red wire  
from switch 5 to the damper motor switch (DMS1) on  
economizer motor no. 2 (or in parallel with SW5).  
7. Switch to fully open power exhaust damper (field-  
supplied normally-open switch 7) — Wire a field-  
supplied switch between terminal C and the normally-  
closed switch on DPS2.  
NOTES AND LEGEND FOR FIG. 20  
LEGEND  
Contactor  
Differential Pressure Switch  
Damper Motor Switch  
Economizer  
BUILDING PRESSURIZATION  
SMOKE PURGE  
Switch 1  
ALARM  
Switch 1  
Switch 3  
Switch 1  
Switch 2  
Switch 4  
Switch 5  
C
—
—
—
—
—
—
—
—
—
—
—
—
—
Switch 2  
DPS  
DMS  
ECON  
IFC  
Switch 5  
Switch 6  
Switch 7 (MPE)  
Indoor (Evaporator) Fan Contactor  
Modulating Power Exhaust  
Normally Closed  
MPE  
NC  
Switch 1  
Switch 2  
Switch 3  
—
—
—
Remove jumper. Firestat or smoke detector  
normally closed.  
—
NO  
Normally Open  
PEC  
PL  
Power Exhaust Contactor Coil  
Plug  
Switch to drive economizer outdoor-air damper fully  
open — normally open.  
SW  
Switch  
Switch to disconnect power to economizer motors.  
Drives economizer outdoor-air damper fully closed —  
normally closed.  
TB  
Terminal Block  
TRAN  
Transformer  
NOTES:  
Switch 4  
Switch 5  
Switch 6  
Switch 7  
—
—
—
—
Building pressurization switch (energize evaporator-  
fan motor) — normally open.  
1. Power exhaust option can be unit mounted on vertical supply/  
return units only.  
is field wiring.  
is field wiring.  
4. Switches 1-7 are field supplied.  
5. For building pressurization, field supplied power source must drive  
room terminals wide open.  
Switch to isolate evaporator-fan motor — normally  
closed.  
2.  
3.  
Switch to energize power exhaust motors — normally  
open.  
Switch to fully open power exhaust damper —  
normally open.  
34  
034 AND 044 UNITS  
054-074 UNITS  
BASE UNIT  
BASE UNIT  
BASE UNIT  
OPTIONAL MODULATING POWER EXHAUST  
OPTIONAL MODULATING POWER EXHAUST  
OPTIONAL NON-MODULATING EXHAUST  
Fig. 20 — Field Wiring for Building Pressurization and Smoke Purge  
OPTIONAL NON-MODULATING EXHAUST  
35  
Remove shipping block-offs and shipping tape from open-  
ings in access panel. Inlet hoods are shipped unassembled  
and must be assembled in place. See Fig. 23. The inlet hood  
consists of a hood, 2 side plates, and an inlet screen.  
Gas Piping (48 Series Units Only) — Unit is equipped  
for use with natural gas only. Installation must conform with  
local building codes, or in the absence of local codes, with  
the National Fuel Gas Code, ANSI Z223.1.  
Install inlet hoods using screws provided.  
A 1/8-in. NPT tapping plug, accessible for test gage con-  
nection, must be field installed immediately upstream of gas  
supply connection to unit, but after manual gas valve. See  
Fig. 21. Natural gas pressure at unit gas connection must not  
be less than 5 in. wg or greater than 13 in. wg.  
Size gas supply piping for 0.5 in. wg maximum pressure  
drop. Do not use supply pipe smaller than unit gas  
connection.  
NOTE: Hoods must be assembled in place on the access panel.  
Flanges on hood and side plates go to the inside of the ac-  
cess panel.  
Install inlet screen on each inlet hood using speed clips  
and screws provided. Attach flue hoods (see Fig. 24) to ac-  
cess panel using screws provided. Hoods go over each com-  
bustion air outlet.  
Sub-assemble flue deflector baffle inside the flue deflector  
hood as shown in Fig. 25 and 26. Flue deflector baffle must  
be assembled and installed on the access panel so that the  
holes in the mounting flange are at the bottom. Install flue  
deflector hood over flue hoods. Be sure that deflector scoop  
is pointed up.  
Disconnect gas piping from unit when leak testing at  
pressures greater than 0.5 psig. Pressures greater than  
0.5 psig will cause gas valve damage resulting in a haz-  
ardous condition. If gas valve is subjected to pressure  
greater than 0.5 psig, it must be replaced.  
UNIT SIZES 054-074 — The 48 series high-heat units have  
2 large inlet hoods, 2 small inlet hoods, 3 flue hoods, and  
3 flue deflector hoods. See Fig. 27 and 28. The 48 series  
low-heat units have one large inlet hood, 2 small inlet hoods,  
2 flue hoods, and 2 flue deflector hoods. (See Fig. 27  
and 28).  
Remove shipping block-offs and shipping tape from open-  
ings in access panels. Inlet hoods are shipped unassembled  
and must be assembled in place. See Fig. 23. Inlet hoods  
consist of a hood, 2 side plates, and an inlet screen.  
Installing Flue/Inlet Hoods (48 Series Units Only)  
— The flue/inlet hoods are shipped in a bag taped to the  
basepan in the gas section.  
UNIT SIZES 034 AND 044 — The 48 series units have 2  
inlet hoods, 2 flue hoods, and 2 flue deflector hoods. See  
Fig. 22. The 48 series low-heat units have one inlet hood,  
one flue hood and one flue deflector hood.  
Install large and small inlet hoods using screws provided.  
NOTE: Hoods must be assembled in place on the access panel.  
Flanges on hood and side plates go to the inside of the ac-  
cess panel.  
Install inlet screen in each inlet hood using speed clips  
and screws provided. Attach flue hoods (see Fig. 24) to ac-  
cess panel using screws provided. Hoods go over each com-  
bustion air outlet.  
Sub-assemble flue deflector baffle inside flue deflector hood  
as shown in Fig. 29. Install flue deflector hoods over flue  
hoods. (See Fig. 27.)  
NOTE: Be sure deflector hoods are installed as shown and  
not upside down. The holes in the mounting flange must be  
at the bottom when installed on access panel.  
*NPT plug is field supplied.  
NOTE: Follow all local codes.  
Fig. 21 — Gas Piping Details  
INLET HOOD  
FLUE HOOD AND  
FLUE DEFLECTOR  
HOOD (48 SERIES  
HIGH-HEAT ONLY)  
INLET HOOD  
SIDE PLATE  
(TYP EACH SIDE)  
INLET HOOD  
(48 SERIES HIGH-  
HEAT ONLY)  
FLUE HOOD AND  
DEFLECTOR  
HOOD  
INLET HOOD  
Fig. 23 — Inlet Hood  
Fig. 22 — Flue/Inlet Hood, 034,044 Units  
36  
FLUE HOOD  
AND FLUE  
DEFLECTOR  
HOOD  
FLUE AND  
FLUE  
DEFLECTOR  
HOOD  
LOCATION  
SMALL  
INLET  
HOOD  
SMALL  
INLET  
LARGE  
INLET  
HOOD  
HOOD  
REMOVED  
LARGE  
Fig. 24 — Flue Hood  
INLET  
FLUE AND  
FLUE  
HOOD  
LOCATION  
(48 SERIES,  
HIGH-HEAT  
ONLY)  
DEFLECTOR  
HOOD  
FLUE DEFLECTOR  
HOOD  
LOCATION  
(48 SERIES,  
HIGH-HEAT  
ONLY)  
Fig. 27 — Flue/Inlet Hood, 054-074 Units  
FLUE  
FLUE HOOD AND  
FLUE DEFLECTOR  
HOOD  
DEFLECTOR  
BAFFLE  
(BOTTOM  
HOOD ONLY)  
SMALL INLET  
HOOD  
FLUE DEFLECTOR  
BAFFLE (BOTH HOODS)  
Fig. 25 — Flue Deflector Baffles, 034,044 Units  
LARGE INLET  
HOOD  
TOP  
(WHEN  
INSTALLED)  
Fig. 28 — Flue/Inlet Hood Close-Up  
FLUE DEFLECTOR  
BAFFLE  
FLUE  
DEFLECTOR  
HOOD  
PUSH  
BAFFLE  
DOWN SO  
THESE 2  
HOLES  
ALIGN  
FLUE  
DEFLECTOR  
BAFFLE  
FOR BOTTOM  
HOOD ONLY  
Fig. 26 — Flue Deflector Hood, 034,044 Units  
(Assembled)  
TOP (WHEN INSTALLED)  
Fig. 29 — Flue Deflector Baffle, 054-074 Units  
(Assembled)  
37  
PRE-START-UP  
Refrigerant Service Valves — All units have a  
Schrader-type service port on both suction lines. Be sure that  
caps on the ports are tight. All units have discharge and suc-  
tion service valves on each compressor and a service valve  
on each liquid line. Be sure the valves are open before start-  
ing unit.  
Unit Preparation — Check to see that unit has been  
installed in accordance with these Installation Instructions  
and all applicable codes.  
Compressor Mounting — Loosen compressor hold-  
down bolts until sidewise movement of the washer under  
each holddown bolt head can be obtained. Do not loosen  
completely, as bolts are self-locking and will maintain  
adjustment.  
Crankcase Heaters — The crankcase heaters must be  
firmly locked into the compressors. The crankcase heaters  
are energized when there is power to the unit. Crankcase  
heaters must be energized with discharge and suction serv-  
ice valves open for at least 24 hours prior to unit start-up in  
order to remove liquid refrigerant from the compressor crank-  
case and to prevent oil foaming.  
Evaporator-Fan Shipping Brackets — Evapor-  
ator-fan shipping brackets (4 per unit) must be removed from  
each corner of the fan sled before starting unit.  
Compressor Oil — Check that compressor oil is vis-  
ible in the sight glass of the compressor. All units are factory  
charged with oil. See Table 8. Observe oil level closely at  
start-up. If oil level is below the sight glass and cannot be  
seen, add oil until the level is approximately 1/4 of sight  
glass. See Carrier Standard Service Techniques, Refriger-  
ants section, for procedures to add or remove oil.  
UNIT SIZES 034 AND 044  
1. To remove brackets, raise fan sled by turning adjusting  
bolt counterclockwise until spring is compressed slightly.  
2. Remove screws holding shipping bracket to unit cross rail.  
3. Remove shipping bracket (top of bracket is slotted so that  
it will slide out).  
4. After removing all shipping brackets, level fan sled using  
the adjusting screws. On all 4 corners, dimension from  
cross rail to fan sled should be as shown in Fig. 30.  
UNIT SIZES 054-074 — To remove shipping brackets, re-  
move the 6 screws holding each bracket to the cross rail.  
There are 8 brackets per unit. See Fig. 30 or 31.  
After removing all shipping brackets, level fan sled using  
the adjusting screws. On all 4 corners dimension from cross  
rail to fan sled should be as shown in Fig. 30 or 31.  
Internal Wiring — Check all electrical connections in  
the unit control box; tighten as required.  
Fig. 31 — Shipping Brackets; 48 Series 054-074 Units  
and 50 Series Horizontal Discharge 054-074 Units  
Table 8 — Oil Charge  
UNIT SIZE  
OIL CHARGE (pints)  
034  
044  
054  
064  
074  
16 ( 8 each circuit)  
28 (14 each circuit)  
33 (19 ckt 1, 14 ckt 2)  
38 (19 each circuit)  
38 (19 each circuit)  
Fig. 30 — Shipping Brackets; 034,044 Units and  
50 Series Vertical Discharge 054-074 Units  
38  
If oil charge is above sight glass, do not remove any oil  
until the compressor crankcase heater has been on for at least  
24 hours. When additional oil or a complete charge is needed,  
use only Carrier-approved compressor oil.  
Evaporator-Fan Belts, Pulleys, and Sheaves —  
Belts, pulleys, and sheaves are factory installed. All pulleys  
are nonadjustable.  
See Tables 1A and 1B for fan shaft center distance ranges  
and shaft sizes when making selections for field-supplied drives.  
See Tables 9A and 9B for a complete listing of field-  
supplied pulleys and belt connections.  
Check the lubrication of fan and motor bearings. Bearings  
are shipped full of grease for corrosion protection and may  
run warm temporarily on start-up until the excess grease has  
discharged. Check bearing setscrews for tightness. Also check  
the tightness of the setscrews on the fan wheel and on the  
fan and motor sheaves. Check fan shaft bearing mountings  
for tightness.  
Approved oils:  
Texaco, Inc. ................................................. Capella WF-32  
Shrieve Chemical Co. ....................... Zerol 150 (Synthetic)  
Witco Co. .......................................................... Suniso 3GS  
Do not reuse drained oil and do not use any oil that has  
been exposed to the atmosphere.  
Gas Manifold Pressure (48 Series Units Only)  
— Check pressure to ensure it matches the pressure stamped  
on the valve body. See Gas Valve Adjustment section on  
page 50 for more details.  
Recheck sheave alignment and belt tension. See Adjust-  
ments section on page 46 for instructions.  
Hand-turn the fan to make sure the fan wheel does not rub  
on the fan housing. The fan shaft and motor shaft must be  
free wheeling before power is applied to the unit.  
Unit Voltage — Be sure power source agrees with the  
unit nameplate rating.  
Leak Test and Dehydration — Be sure there are no  
refrigerant leaks. All units are shipped with a complete op-  
erating charge of R-22 (Tables 1A and 1B) and should be  
under sufficient pressure for leak testing after installation. If  
there is no system pressure, add refrigerant until a pressure  
is observed and then check for leaks. After leaks are re-  
paired, remove and recover refrigerant from the system. For  
leak testing procedures, see Carrier Standard Service Tech-  
niques, Refrigerants section. Do not use the system com-  
pressors to remove refrigerant from the system.  
Following the necessary electrical checks, check for fan  
vibration. If excessive vibration occurs, check for:  
• drive misalignment  
• mismatched belts  
• wheel or sheaves loose on shaft  
• loose bearings  
• loose mounting bolts  
• motor out of balance  
• sheaves eccentric or out of balance  
• wheel out of balance (replace if necessary)  
Table 9A — Field-Supplied Evaporator-Fan Pulley Data, 034,044 Units  
MOTOR PULLEY  
BLOWER PULLEY  
BELTS  
Type  
IFM  
Hp  
IFM  
RPM  
No.  
No.  
Type  
Size (in.)  
Type  
Size (in.)  
Quantity  
Size (in.)  
Grooves  
Grooves  
435  
500  
590  
650  
720  
820  
500  
550  
575  
650  
730  
830  
550  
625  
675  
730  
800  
880  
575  
625  
700  
750  
830  
880  
3.4  
3.9  
4.6  
5.1  
5.6  
6.4  
3.9  
4.3  
4.5  
5.1  
5.7  
6.5  
4.3  
4.9  
5.3  
5.7  
6.3  
6.7  
4.5  
4.9  
5.5  
5.5  
6.5  
6.9  
61.8  
71⁄2  
10  
15  
20  
2
2
2
2
BK  
2
B5V  
13.6  
2
BX  
64.8  
61.8  
BK  
2
2
B5V  
B5V  
13.6  
13.7  
2
2
BX  
63.0  
66.0  
B5V  
5VX  
63.0  
66.0  
63.0  
66.0  
B5V  
B5V  
2
2
B5V  
B5V  
13.7  
13.7  
2
2
5VX  
5VX  
IFM  
—
Indoor (Evaporator) Fan Motor  
39  
Table 9B — Field-Supplied Evaporator-Fan Pulley Data, 054-074 Units  
BELTS  
MOTOR PULLEY  
BLOWER PULLEY  
48 Series and 50 Series  
50 Series  
IFM  
IFM  
Horizontal Discharge Units  
Vertical Discharge Units  
Hp RPM  
No.  
No.  
Type Size (in.)  
Type Size (in.) Quantity  
Type  
Size (in.) Quantity Type Size (in.)  
Grooves  
Grooves  
450  
470  
18.5  
16.1  
15.5  
118  
115  
132  
125  
4.3  
485  
15  
2
B5V  
4.5  
2
B5V  
B5V  
B5V  
B5V  
2
5VX  
2
5VX  
5VX  
5VX  
5VX  
575  
123  
650  
725  
405  
470  
5.1  
5.7  
13.7  
112  
18.5  
16.1  
15.5  
123  
118  
132  
125  
3
2
3
2
4.3  
3
2
3
2
3
2
3
2
3
2
3
2
485  
20  
B5V  
4.5  
5VX  
575  
660  
725  
405  
470  
5.1  
5.7  
13.7  
115  
123  
123  
18.5  
16.1  
15.5  
132  
125  
4.3  
5VX  
B5V  
485  
25  
B5V  
4.5  
575  
115  
123  
700  
725  
470  
485  
5.5  
5.7  
13.7  
16.1  
15.5  
15.5  
4
3
4.3  
4
3
4
3
4
3
530  
30  
4.7  
B5V  
5.5  
5VX  
118  
123  
600  
660  
730  
2
5.9  
6.5  
2
15.5  
2
2
IFM  
—
Indoor (Evaporator) Fan Motor  
Check rotation of wheel with arrow on the fan housing.  
Check fan speed with a strobe-type tachometer, or use this  
formula:  
Condenser Fans and Motors — Each unit has mul-  
tiple condenser fans and motors; these are positioned at the  
factory. See Fig. 32 for correct location of fan in orifice. Check  
that fan propeller rotation is correct; it should be counter-  
clockwise when facing the fans. If fan propeller rotation is  
incorrect, switch motor leads.  
Fan  
Rpm  
motor rpm x motor sheave pitch diameter (in.)  
fan sheave pitch diameter (in.)  
=
(Obtain motor rpm from the fan motor nameplate and read  
sheave pitch diameters marked on the fan and motor sheaves.)  
Return-Air Filters — Check that the correct filters are  
installed in the filter rack. See Tables 1A and 1B for quan-  
tities and sizes. Access is through the door marked FILTER  
SECTION. Do not operate the unit without return-air filters.  
Example:  
Nameplate motor rpm .................................................. 1760  
Motor sheave pitch diameter (in.) .................................. 6.4  
Fan sheave pitch diameter (in.) .................................... 12.4  
Economizer Inlet Screens — Check that they are in  
place before operating the unit.  
1760 x 6.4  
Fan Rpm =  
= 908 Rpm  
Economizer Dampers — With no power to the unit,  
the economizer outdoor-air dampers should be fully closed.  
Check by opening the access door marked FILTER SEC-  
TION. On units with economizer, be sure economizer mini-  
mum position is set at the desired setting. Be sure hood is  
installed properly.  
12.4  
The maximum allowable fan speed for the supply-air fan  
is 900 rpm for 034 and 044 units and 750 rpm for 054-074  
units. The maximum rpm for the power exhaust is 1300 rpm  
for 034 and 044 units and 925 rpm for 054-074 units.  
Excessive fan speed may result in condensate carryover from  
the evaporator coil, fan motor overload, or wheel failure. See  
Table 10 for Air Quantity Limits.  
25% Outdoor-Air Damper — On units without econo-  
mizer, be sure 25% outdoor-air damper is set at the desired  
position. Also, be sure hood is installed properly.  
Table 10 — Air Quantity Limits (cfm)  
UNIT SIZE  
MINIMUM  
MAXIMUM  
034  
044  
054  
064  
074  
6,000  
8,000  
10,000  
12,000  
14,000  
15,000  
20,000  
25,000  
30,000  
30,000  
40  
2. For PIC and VAV units, refer to Controls and Trouble-  
shooting literature for quick test details.  
3. Complete Pre-Start-Up section items and Start-Up Check-  
list.  
Operating Sequences — Base unit operating se-  
quences are presented below. Refer to unit Controls and Trouble-  
shooting literature for details on VAV and PIC controls op-  
eration.  
COOLING, UNITS WITHOUT ECONOMIZER — Unit  
power on, system selector switch set at COOL or AUTO.  
position, fan switch set at AUTO. position.  
On a call for cooling, Y1 on the thermostat subbase closes,  
energizing compressor no. 1 as first stage of cooling. (Com-  
pressor no. 1 is always the larger of the 2 unit compressors.)  
If cooling load cannot be satisfied with only first-stage cool-  
ing, Y2 on the thermostat will close, energizing compressor  
no. 2.  
Fig. 32 — Condenser-Fan Adjustment  
Condenser fans are energized with compressor no. 1. The  
no. 1 fan runs continuously while the unit is on mechanical  
cooling; the no. 2 fan is cycled on and off in response to  
outdoor ambient temperature for head pressure control. Check  
cooling effects at a setting below room temperature. Reset  
thermostat at a setting above room temperature. Compres-  
sors will shut off.  
Initial Check  
IMPORTANT: Do not attempt to start unit, even mo-  
mentarily, until all items on the Start-Up Checklist and  
the following steps have been completed.  
1. Verify unit has been installed per the Installation section  
of this literature.  
HEATING, UNITS WITHOUT ECONOMIZER  
48 Series Low-Heat Units — Unit power on, thermostat sys-  
tem switch set at HEAT or AUTO. position, and fan switch  
set at AUTO. position.  
First-stage thermostat (W1) calls for heat. Time-delay re-  
lay (built into constant volume control board), controlling  
evaporator fan, begins timer sequence (55 ± 10-second de-  
lay). Induced-draft contactor closes and induced-draft motor  
starts.  
2. Certify that all auxiliary components (sensors, controls,  
etc.) have been installed and wired to the control boxes  
per these instructions, the Controls and Troubleshooting  
literature (DK,DY,NB,NP units only), and the unit wiring  
label diagrams.  
3. Verify that pressure hoses (static, duct, etc.) are properly  
attached, routed, and free from pinches or crimps that may  
affect proper control operation.  
Centrifugal switch closes. Pilot valve opens, allowing gas  
to flow to first-stage pilot. Spark ignitor ignites pilot flame.  
Sensor detects flame, energizes main gas valve coil and main  
gas valve opens. Gas flows to main burners and first-stage  
burners ignite. Spark ignitor shuts off and pilot remains on.  
The spark ignitor will continue to spark for 90 seconds  
until pilot flame is sensed. If the pilot fails to ignite or the  
sensor fails to detect flame, the pilot valve closes and the  
spark ignitor shuts off for 300 seconds (5 minutes). During  
this time the induced draft motor remains on to purge any  
unburnt gas from the combustion tubes. This ignition se-  
quence will repeat indefinitely.  
4. Set any control configurations that are required (field-  
installed accessories, etc.). The unit is factory configured  
for all appropriate factory-installed options with the ap-  
plicable controls programmed to the default values. See  
unit Controls and Troubleshooting literature for appli-  
cable configuration values.  
5. Enter unit set points (if applicable). The unit is shipped  
with the set point default values shown in the Controls  
and Troubleshooting literature (as applicable). If a dif-  
ferent set point is required, change per the example shown  
under Set Point Function section in appropriate unit Con-  
trols and Troubleshooting literature.  
6. Configure schedule subfunctions (if applicable): occu-  
pied, unoccupied, and holiday periods. See Schedule Func-  
tion section in Controls and Troubleshooting literature for  
details on setting periods.  
7. Verify that control time periods programmed meet cur-  
rent requirements.  
When time-delay sequence is complete, time-delay relay  
closes and evaporator-fan motor starts.  
When additional heat is needed on 034,044 units, W2 is  
energized and a second coil in the main gas valve is ener-  
gized. This brings on an additional stage of heat. When second-  
stage thermostat is satisfied, the second-stage gas valve coil  
is deenergized.  
When additional heat is needed on 054-074 units, W2 is  
energized, and pilot valve number 2 opens. Gas flows to second-  
stage pilot, and spark ignitor ignites pilot flame. Sensor de-  
tects flame, energizes the main gas valve coil, and main gas  
valve number 2 opens. Gas flows to main burners and second-  
stage burners ignite. Second-stage spark ignitor shuts off. When  
second-stage thermostat is satisfied, the second-stage gas valve  
coil is deenergized.  
8. Check all electrical connections to be sure they are tight.  
START-UP  
General  
1. Put the ON/OFF switch in the ON position. Close the con-  
trol circuit breaker (CCB), which will energize the con-  
trol circuit and the crankcase heaters.  
41  
When the first-stage thermostat is satisfied, first-stage main  
gas valve and the pilot valve close. Induced-draft motor shuts  
off. Time-delay relay (built into constant volume control board)  
opens and timer sequence begins. When sequence is com-  
plete (after 110 ± 5 seconds) evaporator-fan motor shuts off.  
HEATING, UNITS WITH ECONOMIZER — Operation is  
the same as described in Heating, Units Without Econo-  
mizer sections on page 41, except that the outdoor-air damp-  
ers move to the minimum position on a call for heat.  
VENTILATION-AIR CIRCULATION (Continuous Fan) —  
Turn unit power on. Set system selector switch at OFF, HEAT,  
or COOL position, and set fan switch at ON position.  
Evaporator-fan contactor is energized through the switch  
on the thermostat and the evaporator fan runs continuously.  
The damper moves to the minimum position.  
48 Series High-Heat Units — Unit power on, thermostat sys-  
tem switch set at HEAT or AUTO. position, and fan switch  
set at AUTO. position.  
First-stage thermostat (W1) calls for heat. Time-delay re-  
lay (built into constant volume control board), controlling  
evaporator fan, begins timer sequence (approximately 55 ±  
10-second delay).  
When time-delay sequence is complete, time-delay relay  
closes and evaporator fan starts.  
When evaporator fan starts, airflow switch closes, closing  
induced draft contactor, and induced draft motor starts.  
Centrifugal switch closes. Pilot valve opens, allowing gas  
to flow to first-stage pilot. Spark ignitor ignites pilot flame.  
Sensor detects flame, energizes main gas valve coil, and main  
gas valve opens. Gas flows to main burners and first-stage  
burners ignite. Spark ignitor shuts off and pilot remains on.  
The spark ignitor will continue to spark for 90 seconds  
until pilot flame is sensed. If the pilot fails to ignite or the  
sensor fails to detect flame, the pilot valve closes and the  
spark ignitor shuts off for 300 seconds (5 minutes). During  
this time the induced draft motor remains on to purge any  
unburnt gas from the combustion tubes. This ignition se-  
quence will repeat indefinitely.  
When additional heat is needed, W2 is energized. Pilot  
valve no. 2 opens, allowing gas to flow to second-stage pi-  
lot. Spark ignitor ignites pilot flame. Sensor detects flame,  
energizes main gas valve coil, and main gas valve no. 2 opens.  
Gas flows to main burners and second-stage burners ignite.  
Second-stage spark ignitor shuts off. When the second-stage  
thermostat is satisfied, W2 is deenergized and the second  
induced-draft motor and gas valve are shut off.  
When the first-stage thermostat is satisfied, first-stage main  
gas valve and the pilot valve close. Induced draft motor shuts  
off. Time-delay relay (built into constant volume control board)  
opens and timer sequence begins. When sequence is com-  
plete (after 110 ± 5 seconds) evaporator-fan motor shuts off.  
AUTOMATIC CHANGEOVER USING AUTOMATIC  
CHANGEOVER THERMOSTAT — Turn unit power on. Set  
system selector switch at AUTO. position.  
When the temperature of the conditioned space rises to  
the cooling selector lever setting, unit automatically switches  
from heating to cooling mode. When the temperature of the  
conditioned space falls to the heating selector switch setting,  
unit automatically changes from cooling to heating mode.  
The thermostat is interlocked so that cooling and heating sys-  
tems do not operate at the same time.  
Head Pressure Control — All units have a fan cy-  
cling thermostat which cycles the no. 2 condenser fan. This  
switch opens at 60 F ± 3° F and closes at 70 F ± 3° F. This  
allows the unit to operate down to 45 F outdoor ambient  
temperature.  
NOTE:Accessory −20 F LowAmbient Kit is available, which  
allows mechanical cooling to −20 F outdoor ambient. See  
accessory installation instructions for mounting and opera-  
tion details.  
SERVICE  
Service Access — All unit components can be reached  
through clearly labeled hinged access doors. These doors are  
not equipped with tiebacks, so if heavy duty servicing is needed,  
either remove them or prop them open to prevent accidental  
closure.  
Each door is held closed with 3 latches. The latches are  
secured to the unit with a single 1/4-in. Ϫ20 x 1/2-in. long  
bolt. See Fig. 33.  
To open, loosen the latch bolt using a 7/16-in. wrench.  
Pivot the latch so it is not in contact with the door. Open the  
door. To shut, reverse the above procedure.  
50 Series Units — Unit power on, system selector switch  
set at HEAT position, fan switch set at AUTO. position.  
On a call for heating, W1 on the thermostat closes, and  
evaporator fan and the first stage of electric heat are ener-  
gized. On a further drop in room temperature, W2 on the  
thermostat closes, energizing the second stage of electric heat.  
NOTE: Units equipped with low electric heat option have  
only one stage. Reset thermostat to a setting below room  
temperature. Electric heat and evaporator fan shut off.  
NOTE: Disassembly of the top cover may be required under  
special service circumstances. It is very important that the  
orientation and position of the top cover be marked on the  
unit prior to disassembly. This will allow proper replace-  
ment of the top cover onto the unit and prevent rainwater  
from leaking into the unit.  
IMPORTANT: After servicing is completed, make sure  
door is closed and relatched properly, and that the latches  
are tight. Failure to do this can result in water leakage  
into the indoor-air section of the unit.  
COOLING, UNITS WITH ECONOMIZER — With sub-  
base switch set at COOL position and fan switch set at AUTO.  
position, evaporator fan is energized when Y1 on thermostat  
closes. If enthalpy is below setting on enthalpy switch, the  
economizer outdoor-air dampers will modulate open to sat-  
isfy the cooling requirement. If outdoor air alone will not  
meet the cooling requirements, Y2 on the thermostat will  
close energizing compressor no. 1 to work in conjunction  
with the modulating economizer to meet the cooling require-  
ment. While the unit is operating using outdoor air, com-  
pressor no. 2 cannot be energized. If enthalpy is above set-  
ting on enthalpy switch, the economizer outdoor-air dampers  
move to the minimum (ventilation) position, and condenser  
fan numbers 1 and 2 cycle on and off as described in Cool-  
ing, Units Without Economizer section on page 41.  
COMPRESSORS  
Sizes 034 and 044 — Access to the compressors is through  
the doors on the condenser end of the unit. This door also  
provides access to the discharge and suction service valves,  
the crankcase heaters, and the high- and low-pressure switches.  
Compressor no. 1 is always the compressor on the left when  
facing main control box.  
Sizes 054-074 — The oil pump end (compressor access) of  
each compressor is readily accessible from sides of unit as  
shown in Fig. 17. Access the motor end of the compressor  
through the condenser end of the unit or by removing  
compressor.  
NOTE: If fan switch is ON position and the room thermostat  
is satisfied, the outdoor-air dampers move to the minimum  
position.  
42  
Fig. 33 — Door Latch  
LIQUID SERVICE VALVES, FILTER DRIERS, AND SIGHT  
GLASSES  
Fig. 35 — Modulating Power Exhaust Damper  
Motor Access, 034 and 044 Units  
Sizes 034 and 044 — Access to these components is through  
the access panel on the right side of the unit. See Fig. 34.  
There is also a Schrader port in each suction line that is ac-  
cessible through this same panel. When charging unit, route  
service line through the round holes and replace panel to mini-  
mize air bypass.  
Sizes 054-074 — Access to these components is from the  
side of the unit as shown in Fig. 34.  
EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS  
— Access to these components is through the 2 doors la-  
beled FAN SECTION on each side of the unit.  
POWER EXHAUST MOTORS, PULLEYS, AND BELTS  
— Access to these components is through the door below  
the side economizer hoods on either side of the unit. See  
Fig. 35 and 36.  
UNIT CONTROL BOX —Access to this component is through  
the doors marked ELECTRICAL SECTION on the con-  
denser end of the unit (when facing the condenser coil).  
GAS HEAT SECTION (48 Series Units Only) — Access to  
the gas heat section is through the door labeled HEAT SEC-  
TION on the left side of the unit (when facing condenser  
end). See Fig. 37 and 38.  
All gas system components are in the gas section.  
MAIN AND PILOT BURNERS (48 Series Units Only) —  
At the beginning of each heating season, inspect for dete-  
rioration due to corrosion or other causes. Observe the pilot  
and main burner flames and adjust if necessary. See Auto-  
matic Pilot Adjustment or Main Burners Adjustment Section  
on pages 49 and 50.  
Fig. 36 — Modulating Power Exhaust Motor  
Access, 054-074 Units  
FLUE GAS PASSAGEWAYS (48 Series Units Only) — The  
flue collector box and heat exchanger cells may be inspected  
by removing the combustion air blower(s), flue box cover,  
and main burner assembly. See Fig. 39 and 40. If cleaning  
is required, remove heat exchanger baffles through the flue  
box and clean all parts with a wire brush. When replacing  
heat exchanger baffles, be sure to replace screw through clamp  
on baffle retaining rod into the vestibule plate.  
COMBUSTION AIR BLOWER (48 Series Units Only) —  
Clean periodically to assure proper airflow and heating ef-  
ficiency. Inspect blower wheel every fall and periodically dur-  
ing the heating season. For first heating season, inspect blower  
wheel bimonthly to determine proper cleaning frequency. If  
cleaning is required, remove blower assembly from unit and  
then disassemble and clean. See Fig. 41.  
Fig. 34 — Typical Filter Drier and Liquid Service  
Valve Access  
43  
Fig. 39 — Burner Section Detail (48 Series Units Only)  
NOTE: High heat consists of sections 1 and 2.  
Low heat consists of section 1 only.  
Fig. 37 — Gas Section Detail, 48 Series 034 and  
044 Units  
Fig. 40 — Flue Box Assembly, 48 Series Units Only  
(Shown with Burner Assembly)  
NOTE: High heat consists of sections 1-3.  
Low heat consists of section 1 and 2 only.  
Fig. 38 — Gas Section Detail, 48 Series 054-074 Units  
Fig. 41 — Combustion Blower Removal  
ECONOMIZER DAMPER MOTOR — On units so equipped,  
the economizer motor is located in the mixing box section.  
Access to it is through the doors labeled FILTER SECTION  
on the sides of the unit.  
• fuse blocks FB1, FB2, etc.  
• fuses FU (3 per fuse block)  
• heater contactors HC1, HC1A, etc.  
• plug No. 20 (PL20)  
ELECTRIC HEATER CONTROL BOX (50 Series Units Only)  
— Access to the electric heater control box is through the  
door on the right side of the unit next to the condenser sec-  
tion. See Fig. 16 and 17.  
The electric heater control box contains:  
• power terminal block HTB, HTB1, HTB2 (not used on all  
voltages)  
HEATER BOX (50 Series Units Only) —Access to the heater  
box is through the door on the left side (sizes 034 and 044)  
or right side (sizes 054-074) of the unit next to the con-  
denser section. See Fig. 16 and 17. See Fig. 42 for heater  
box contents.  
44  
NOTE: Only the heater element contactors are located in the  
heater box. The heaters are located in the unit airstream.  
Cleaning — Inspect unit at the beginning of each heating  
and cooling season and during each season as operating con-  
ditions may require.  
Clean condenser coil with a vacuum cleaner, fresh water,  
compressed air, or a bristle brush (not wire). Coil cleaning  
should be a part of the planned maintenance program. Clean  
evaporator coil with a stiff bristle brush (not wire), vacuum  
cleaner, or compressed air.  
25% OUTDOOR-AIR DAMPER — Access to adjust the  
damper is through the hoods. Remove filters to gain access  
into unit to adjust linkage arms.  
MODULATING POWER EXHAUST DAMPER MOTOR  
— The modulating power exhaust damper motor is located  
in the return-air end of the unit.  
On unit sizes 034 and 044, it is accessed by removing the  
access panel on the left-hand corner post. See Fig. 35.  
Check and clean condensate drain annually at the start of  
the cooling season.  
Replace return-air filters at the start of each heating and  
cooling season or as often as necessary during each season,  
depending on operating conditions. See Tables 1A and 1B  
for filter types, quantities, and sizes.  
IMPORTANT: When replacing panel, be sure to prop-  
erly secure it in order to prevent water from being drawn  
into the unit.  
1. Remove economizer outdoor-air filters from the hoods by  
removing the filter retainers.  
2. Clean filters with steam or hot water and mild detergent.  
3. Reinstall filters in hoods after cleaning. Never replace clean-  
able filters with throwaway filters.  
On unit sizes 054-074, the motor is accessed through the  
small door below the side economizer hoods on the left side  
of the unit. See Fig. 36.  
RETURN-AIR FILTERS — Access to these filters is through  
the door marked FILTER SECTION. Filters in upper and  
lower bag filter tracks can only be removed from the left  
side of the unit (when facing condenser end).  
Lubrication  
COMPRESSORS — Each compressor is correctly charged  
at the factory. Refer to 06D and 06E Compressor Service  
Manuals if additional information regarding compressor lu-  
brication system is required. See Compressor Oil section on  
page 38 and Table 8.  
CONDENSER FANS AND FAN MOTORS — Remove the  
wire fan guard on top of the unit to gain access to the con-  
denser fans and motors.  
INLET GUIDE VANE MOTOR — The inlet guide vane mo-  
tor is located on the evaporator-fan sled on the side opposite  
the fan motor. See Fig. 43. Access is through the door la-  
beled FAN SECTION on the left side of the unit.  
FAN SHAFT BEARINGS — Lubricate fan shaft bearings at  
least once a year with suitable bearing grease. Extended grease  
lines are provided on pulley side of blower. Typical lubri-  
cants are given below:  
MANUFACTURER  
LUBRICANT  
Texaco  
Mobil  
Sunoco  
Texaco  
Regal AFB-2*  
Mobilplex EP No. 1  
Prestige 42  
Multifak 2  
*Preferred lubricant because it contains rust and oxidation inhibitors.  
INLET GUIDE VANE BEARINGS (Units With Optional  
Inlet Guide Vanes) — These bearings are oil impregnated.  
Lubricate annually with a few drops of nondetergent  
SAE 20 oil.  
FAN MOTOR BEARINGS — The condenser- and evaporator-  
fan motors have sealed bearings so no field lubrication is  
required.  
DOOR HINGES — All door hinges should be lubricated at  
least once a year.  
LEGEND  
C
—
—
—
—
—
—
Contactor  
FB  
FU  
HC  
HTB  
PL  
Fuse Block  
Fuse  
Heat Element Contactor  
Heater Terminal Block  
Plug Assembly  
Fig. 43 — Inlet Guide Vane Motor  
Fig. 42 — Typical Electric Heat Control Box  
45  
Adjustments  
EVAPORATOR FAN AND POWER EXHAUST MOTOR  
PLATE — Adjust using a 15⁄16-in. wrench on the adjusting  
bolts:  
1. Loosen holddown bolts. (See Fig. 44.)  
2. Turn the adjusting bolts to move the motor mounting plate  
toward or away from the fan to loosen or tighten the belts.  
Make the same number of turns to each bolt.  
3. Retighten holddown bolts.  
MODULATING POWER EXHAUST DIFFERENTIAL  
PRESSURE SWITCH — On 034,044 units, the differential  
pressure switch is located in the auxiliary control box. The  
auxiliary control box is mounted in the corner next to the  
power exhaust motor door. To gain access to the auxiliary  
control box, remove the auxiliary control box cover. When  
replacing the auxiliary control box cover, be sure to secure  
the cover properly in order to prevent water from being drawn  
into the auxiliary control box.  
Fig. 44 — Motor Plate Adjustment  
On 054-074 units, the differential pressure switch is mounted  
below the auxiliary control box next to the access door la-  
beled FILTER SECTION.  
PULLEY ALIGNMENT — For proper belt life, the motor  
and fan pulleys must be properly aligned. To check, first turn  
off unit power. Place a straightedge against the motor and  
fan pulleys. See Fig. 45. If the pulleys are properly aligned,  
the straightedge should be parallel to the belts.  
If they are not parallel, check that the motor shaft and fan  
shaft are parallel. If they are not, adjust the motor plate ad-  
justing bolts until they are.  
After verifying that the shafts are parallel, loosen the set-  
screws on the motor pulley. Move pulley on the shaft until  
the pulleys are parallel. To move the sheave on the shaft,  
loosen the belts. If necessary, blower sheave can also be moved  
on the shaft.  
INLET GUIDE VANE DIFFERENTIAL PRESSURE  
SWITCH (Units With Optional Inlet Guide Vanes and Static  
Pressure Control) — On 034,044 units, the inlet guide vane  
differential pressure switch is located in the auxiliary control  
box. The auxiliary control box is mounted in the corner of  
the unit under the side air hood that is next to the access  
door marked FILTER SECTION. To gain access to the aux-  
iliary box, remove the auxiliary control box cover. When re-  
placing the auxiliary control box cover, be sure to secure the  
cover properly in order to prevent water from being drawn  
into the auxiliary control box.  
On 054-074 units, the inlet guide vane differential pressure  
switch is mounted on an upright located behind the evaporator-  
fan motor. See Fig. 43.  
INSTALLING ALTERNATE MOTOR PULLEY (Evapora-  
tor Fan Only) — On all units, the alternate motor pulley is  
field-supplied. To install the alternate pulley:  
BELT INSTALLATION AND TENSIONING  
IMPORTANT: When installing or replacing belts, al-  
ways use a complete set of new, matched belts to pre-  
vent potential vibration problems. Mixing belts often  
results in premature breakage of the new belts.  
1. Turn off unit power.  
2. Loosen belts using motor adjusting bolts until belts can  
be removed without stretching them over the grooves of  
the pulley.  
3. Remove belts.  
4. Loosen setscrews on motor pulley.  
5. Slide pulley off motor shaft. Make sure setscrews on new  
pulley are loose.  
6. Slide new pulley onto fan shaft and align it with the fan  
pulley as described in Pulley Alignment section above.  
7. Tighten setscrews.  
8. Install belts and tension properly as described in Pulley  
Alignment section above.  
1. Turn off unit power.  
2. Adjust motor plate so belts can be installed without stretch-  
ing over the grooves of the pulley. (Forcing the belts can  
result in uneven belt stretching and a mismatched set of  
belts.)  
3. Before tensioning the belts, equalize belt slack so that it  
is on the same side of the belt for all belts. Failure to do  
so may result in uneven belt stretching.  
4. Tighten belts using the motor plate adjusting bolts.  
5. Adjust until proper belt tension (1/2-in. deflection with  
one finger) is obtained. Be sure to adjust both adjusting  
bolts the same number of turns.  
CONDENSER FAN ADJUSTMENT  
1. Turn off unit power.  
2. Remove fan guard and loosen fan hub setscrew.  
3. See Fig. 32 and adjust fan height using a straight edge  
laid across the fan deck.  
4. Tighten setscrew and replace rubber hubcap to prevent  
hub from rusting to the motor shaft. Fill hub recess with  
Permagum if hub has no rubber hubcap.  
NOTE: Check the tension at least twice during the first  
day of operation, as there is normally a rapid decrease in  
tension until the belts have run in. Check tension  
periodically thereafter and keep it at the recommended  
tension.  
With the correct belt tension, belts may slip and squeal  
momentarily on start-up. This slippage is normal and dis-  
appears after wheel reaches operating speed. Excessive belt  
tension shortens belt life and may cause bearing and shaft  
damage.  
5. Replace fan guard.  
46  
Fig. 46 — Charging Chart, 034 Units; System 1,  
One Condenser Fan Running  
Fig. 45 — Pulley Alignment  
Fig. 47 — Charging Chart, 034 Units; System 1,  
All Condenser Fans Running  
25% OUTDOOR-AIR DAMPER — See Manual Outdoor-  
Air Damper section on page 10 for adjustment details.  
REFRIGERANT CHARGE — All units are shipped with a  
complete operating charge of R-22. See unit nameplate and  
Tables 1A and 1B for amount of charge. When adding a com-  
plete charge, evacuate system using standard evacuating pro-  
cedures and weigh in the specified amount of charge. All  
units have charging charts for each refrigerant circuit. See  
Fig. 46-59.  
PILOT LIGHT OFF (48NP Units Only) — If pilots do not  
light as described in Heating section on page 41, be sure that  
pilot orifice is unobstructed, then check for spark ignitor mal-  
functions as follows:  
1. Turn off the control circuit breaker (CCB) to shut off con-  
trol supply power to ignitor control pack (ICP).  
3
2. Check that spark gap is ⁄8 in. Ϯ 1⁄32 inch.  
3. Check that ICP is securely grounded.  
4. Check that the high-voltage lead is securely connected  
between the ICP and the electrode body.  
5. Turn on CCB to restore power to ICP. Check that 24 v is  
supplied to terminal TH of the ICP.  
6. Check unit label diagram for correct terminal usage if any  
wires are removed.  
Fig. 48 — Charging Chart, 034 Units; System 2,  
One Condenser Fan Running  
47  
Fig. 49 — Charging Chart, 034 Units; System 2,  
All Condenser Fans Running  
Fig. 52 — Charging Chart, 044 Units; System 2,  
One Condenser Fan Running  
Fig. 50 — Charging Chart, 044 Units; System 1,  
One Condenser Fan Running  
Fig. 53 — Charging Chart, 044 Units; System 2,  
All Condenser Fans Running  
Fig. 51 — Charging Chart, 044 Units; System 1,  
All Condenser Fans Running  
Fig. 54 — Charging Chart, 054 Units; System 1,  
All Condenser Fans Running  
48  
Fig. 55 — Charging Chart, 054 Units; System 2,  
All Condenser Fans Running  
Fig. 58 — Charging Chart, 074 Units; System 1,  
All Condenser Fans Running  
Fig. 59 — Charging Chart, 074 Units; System 2,  
All Condenser Fans Running  
Fig. 56 — Charging Chart, 064 Units; System 1,  
All Condenser Fans Running  
AUTOMATIC PILOTADJUSTMENT (48 Series Units Only)  
1. Set system selector switch at OFF position to shut off unit.  
Turn off power to unit.  
2. Remove screw cap cover on pilot gas valve to expose  
adjusting screw.  
3. To ensure that main burners do not ignite, remove wire  
from gas valve terminal 2. Tape wire. Do not allow wire  
to be grounded.  
4. Turn on power to unit. Set system selector switch to HEAT  
position and set thermostat to a setting that will call for  
heat. Pilot ignites.  
5. With a small screwdriver, turn adjustment screw until flame  
fully engulfs sensor.  
6. Replace cap on pilot gas valve. Turn off power to unit.  
Return valve(s) to original position.  
7. Check for proper burner operation by cycling the burn-  
ers. Wait 30 seconds between burner cycles.  
Fig. 57 — Charging Chart, 064 Units; System 2,  
All Condenser Fans Running  
8. Check that all panels are closed securely before leaving  
the unit.  
49  
GAS VALVE ADJUSTMENT (48 Series Units Only) — The  
gas valve opens and closes in response to the thermostat or  
limit control. When power is supplied to valve terminal 3  
(D1 on low heat), the pilot valve opens to the preset posi-  
tion. When power is supplied to terminal 2 (W1 on low heat),  
the main valve opens to its preset position.  
The regulator factory manifold pressure setting 2.9 in. wg  
and is stamped on the valve body.  
Manifold pressure is the pressure at the factory-supplied  
pressure tap on the manifold downstream of the gas valve.  
This is not the same as the pressure at the tap on the gas  
valve body. Always use the tap on the manifold to read mani-  
fold pressure.  
1. Remove top cover from motor to gain access to motor  
terminals and cam adjustments.  
2. Disconnect controller from motor. Connect RED, WHITE,  
and BLUE terminals on the 135-ohm manual potentiom-  
eter to corresponding RED, WHITE, and BLUE termi-  
nals on the motor. Connect 24-vac power to Terminals 1  
and 2. See Fig. 60.  
3. Adjust the 135-ohm potentiometer so that the motor shaft  
turns to the position where auxiliary equipment is to be  
switched.  
1
4. Adjust auxiliary cam by inserting a ⁄8-in. straight blade  
screwdriver into slot on cam and moving TOP of screw-  
driver to the right or left. See Fig. 61.  
To adjust regulator:  
5. To close auxiliary switch RED and BLUE contacts as the  
motor travels open (energizing the power exhaust mo-  
tor), the switch differential can only be 10 degrees on both  
switches. To adjust either cam, perform the following steps:  
1. Set thermostat at setting for no call for heat.  
2. Turn main gas valve to OFF position.  
3. Install a suitable pressure measuring device.  
4. Set main gas valve to ON position.  
5. Set thermostat to call for high fire (W2).  
6. Remove screw cap or plastic cover covering the regula-  
tor adjustment screw.  
7. Turn adjustment screw clockwise to increase pressure or  
counterclockwise to decrease pressure.  
a. If RED and BLUE contacts are open, rotate the cam  
counterclockwise until the contacts close.  
b. If the RED and BLUE contacts are closed, rotate the  
cam clockwise until the contacts open.  
Refrigerant Feed Components — Each refrigerant  
circuit (2 per unit) has all the necessary refrigerant controls.  
Thermostatic Expansion Valve (TXV) — On size  
034, each circuit has one. On size 044, each circuit has 2.  
The superheat is nonadjustable. On sizes 054-074, each cir-  
cuit has 2 TXVs on which superheat may be adjusted if ab-  
solutely necessary.  
The TXV is set to maintain 10 to 13 F superheat leaving  
the evaporator coil. It controls the flow of refrigerant to the  
evaporator coils.  
8. Once desired pressure is established, remove pressure-  
measuring device and replace screw cap.  
MAIN BURNERS ADJUSTMENT (48 Series Units Only)  
— Main burners are factory set and should require no ad-  
justment. However, if burner adjustment is necessary:  
1. Perform Automatic Pilot Adjustment (page 49).  
2. Turn gas valve to ON position. Allow unit to operate at  
least 15 minutes with heat section access panel closed.  
3. Open heat section access panel.  
4. Loosen primary air shutter and adjust to a minimum open-  
5
ing of ⁄8 inch.  
5. Retighten primary air shutter and close access panel.  
To check ignition of main burners and fan switch opera-  
tion, move thermostat dial above and below room tempera-  
ture several times, pausing at least one minute between cycles.  
Main Burner Removal (48 Series Units Only)  
NOTE: For high-heat units, the side posts must be removed  
before the burner assembly can be removed.  
1. Shut off main gas valve.  
2. Shut off power to unit.  
3. Unplug PL9 (and PL10 on high-heat) and all sensor and  
ignitor wires.  
4. Disconnect gas connection(s) from between gas valve(s)  
and field-supplied piping. See Fig. 37 and 38.  
5. Remove 2 screws securing burner assembly to unit.  
6. Slide burner assembly from unit.  
Switch Adjustment — All units with an economizer  
have an auxiliary switch located on the economizer damper  
motor. This switch is factory set to prevent the power ex-  
haust from operating when the economizer damper is less  
than 50% open. If other than the factory setting is desired,  
follow the steps below.  
Fig. 60 — Auxiliary Switch Stroke Adjustment  
Do not turn motor shaft by hand or with a wrench. Dam-  
age to the gear train will result.  
50  
Compressor Discharge Service Valve — Each  
compressor has one.  
Compressor Suction Service Valve — Each com-  
pressor has one.  
Protective Devices  
COMPRESSOR PROTECTION  
Overcurrent — Each compressor has one manual reset, cali-  
brated trip, magnetic circuit breaker. Do not bypass connec-  
tions or increase the size of the circuit breaker to correct trouble.  
Determine the cause and correct it before resetting the breaker.  
Overtemperature — Each 06D compressor has an internal  
protector to protect it against excessively high discharge gas  
temperatures. Each 06E compressor has an external dis-  
charge gas thermostat. See Fig. 62. They will reset, but the  
circuit will automatically be locked out by the control board.  
Unit must be manually reset by interrupting control power.  
Crankcase Heater — Each compressor has a crankcase heater  
to prevent absorption of liquid refrigerant by oil in the crank-  
case when the compressor is idle. Since 115-v power for the  
crankcase heaters is drawn from the unit control circuit, main  
unit power must be on for the heaters to be energized.  
IMPORTANT: After a prolonged shutdown or service  
job, energize the crankcase heaters for 24 hours before  
starting the compressor.  
Compressor Lockout — If any of the safeties (compressor  
internal thermostat [06D compressors only], high-pressure,  
or low-pressure) trip, or if there is a loss of power to the  
compressors, the compressors will be locked out. To reset  
DJ,DW units, manually move the thermostat setting. To re-  
set DK,DY,NB,NP units, consult the controls and trouble-  
shooting literature for the appropriate unit for details.  
Fig. 61 — Auxiliary Switch Adjustment  
EVAPORATOR-FAN MOTOR PROTECTION — A manual  
reset, calibrated trip, magnetic circuit breaker protects against  
overcurrent. Do not bypass connections or increase the size  
of the breaker to correct trouble. Determine the cause and  
correct it before resetting the breaker.  
Moisture/Liquid Indicator — A clear flow of liquid  
refrigerant indicates sufficient charge in the system. Bubbles  
indicate undercharged system or the presence of noncon-  
densables. Moisture in the system measured in parts per mil-  
lion (ppm) changes the color of the indicator:  
Green — moisture below 45 ppm (dry)  
CONDENSER-FAN MOTOR PROTECTION — Each  
condenser-fan motor is internally protected against over-  
temperature. They are also protected against a severe over-  
current condition by manual reset, calibrated trip, magnetic  
circuit breakers on a common circuit. As with the circuit break-  
ers, do not bypass connections or increase breaker size to  
correct trouble. Determine the cause and correct it before  
resetting the breaker.  
Chartreuse — 45 to 130 ppm (caution!)  
Yellow — moisture above 130 ppm (wet)  
Change filter driers at the first sign of moisture in the sys-  
tem. See Carrier Charging Handbook for more information.  
IMPORTANT: Unit must be in operation at least  
12 hours before moisture indicator can give an accu-  
rate reading. With unit running, indicating element must  
be in contact with liquid refrigerant to give a true  
reading.  
HIGH- AND LOW-PRESSURE SWITCHES — See Fig. 62  
for compressor mounting locations. Settings for these switches  
are shown in Table 11. If either switch trips, that refrigerant  
circuit will be automatically locked out by the controls. To  
reset, interrupt control power.  
NOTE: When a pressure transducer is used, the low pres-  
sure trip point is the same as the low-pressure switch.  
Filter Drier — Replace whenever the moisture/liquid in-  
dicator shows moisture in the system.  
Relief Devices — All units have relief devices to pro-  
tect against damage from excessive pressures (i.e., fire). These  
devices protect the high and low side.  
Liquid Line Service Valve — Located immediately  
ahead of the filter drier, this valve has a 1/4-in. flare con-  
nection for field charging. With the liquid circuit shut, the  
compressor can be used to pump the refrigerant down into  
the high side. The refrigerant can then be stored there by  
closing the compressor discharge valve.  
51  
Fig. 63 — Location of Rollout Switch Capillary Tube  
Fig. 62 — Typical Compressor Overtemperature,  
High- and Low-Pressure Switch Locations  
ECONOMIZER MOTOR CHECKOUT — The motor may  
be checked out separately from the control board. See  
Table 12 for motor checkout. To check out the motor, apply  
24 VAC power to terminals T0 and T2 of the control board.  
Table 11 — Pressure Switch Settings (psig)  
SWITCH  
High  
CUTOUT  
426 Ϯ 7  
27 Ϯ 4  
CUT-IN  
NOTE: The connections to motor terminals T1 and R must  
remain in place.  
320 Ϯ 20  
Low  
67 Ϯ  
7
Table 12 — Economizer Motor Checkout  
Control Circuit, 115 V — This control circuit is pro-  
tected against overcurrent by a 5-amp circuit breaker. Breaker  
can be reset. If it trips, determine cause of trouble before  
resetting.  
MOTOR  
TEST  
PROCEDURE  
EXPECTED RESULT  
AND RESPONSE  
A
Remove wire connected to Motor drives open. If not,  
terminal W on the motor. replace the motor.  
Remove wire connected to Motor drives closed. If not,  
terminal B on the motor,  
leaving W wire discon-  
nected (Test A).  
B
Control Circuit, 24 V — This control circuit is pro-  
tected against overcurrent by a 3.2-amp circuit breaker. Breaker  
can be reset. If it trips, determine cause of trouble before  
resetting.  
replace the motor.  
CONTROL BOARD CHECKOUT — To check out the con-  
trol board motor, conduct the following 4 tests.  
Test 1:  
1. Apply 24 VAC power to terminals T0 and T2 of control  
board.  
2. Remove mixed air sensor connected between terminals  
S1 and S2.  
3. Remove outdoor-air enthalpy sensor between terminals  
ϩϩ and SO.  
4. Refer to Table 13.  
Electric Heat (50 Series Units Only)  
OVERCURRENT — Heaters are protected by fuses in the  
power circuit, located in the heater control box. As with cir-  
cuit breakers, determine the cause of fuses tripping before  
replacing them. Do not replace with larger fuses. All fuses  
are 60 amp.  
OVERTEMPERATURE — Heaters are protected by limit  
switches mounted in the heater box. They reset automati-  
cally once they cool.  
Gas Heat (48 Series Units Only)  
Table 13 — Economizer Control Board Checkout,  
Test 1  
LIMIT SWITCHES — The maximum supply-air tempera-  
ture is controlled by a limit switch located in the gas section.  
The limit is designed to trip at 100 F above the maximum  
temperature rise shown in Tables 1A and 1B.  
MOTOR  
TEST  
PROCEDURE  
EXPECTED RESULT  
AND RESPONSE  
When the limit trips, the gas valve is deenergized. Once  
the unit cools, the gas valve is reenergized.  
A
Turn minimum position  
potentiometer fully  
counterclockwise.  
Motor drives closed. If not,  
check minimum position  
jumper between  
terminals Z and Y, and  
check terminal W and T1  
connections to motor.  
ROLLOUT SWITCH — This switch senses any flame or  
excessive heat in the main burner compartment and deen-  
ergizes the gas valve. If this occurs, the gas heating system  
is locked out until the rollout switch is reset manually. Reset  
by pressing the button on the rollout switch. See Fig. 39.  
When the rollout switch trips, it likely indicates a flue block-  
age. Inspect the unit for any obstruction in the flue system,  
for holes on the flue box, or for a defective centrifugal switch  
or loose combustion blower. See Fig. 63 for proper location  
of the rollout capillary.  
B
Turn minimum position  
potentiometer fully  
clockwise.  
Motor drives open. If not,  
check terminal B and R  
connections to the motor.  
Test 2:  
1. Apply 24 VAC power to terminals T0 and T2 of the con-  
trol board.  
2. Apply 24 v between terminals 1 and T2, and jumper ter-  
minal T0 to terminal 1.  
TROUBLESHOOTING  
3. Remove the mixed-air sensor connected between termi-  
nals S1 and S2, and replace it with a 5490-ohm resistor.  
Economizer — The economizer control consists of an  
electronic control board mounted on the back of the cover  
plate of the economizer motor with the adjustments and elec-  
trical plugs accessible through the top of the cover. The econo-  
mizer control is factory wired to the terminals on the motor.  
All potentiometers and adjustments are a part of the control  
board.  
4. Remove outdoor-air enthalpy sensor between terminals  
ϩϩ and SO, and replace it with a 1.2 kOhm resistor.  
5. Turn the minimum position potentiometer fully counter-  
clockwise.  
6. Refer to Table 14.  
52  
Table 14 — Economizer Control Board Checkout,  
Test 2  
Table 16 — Economizer Control Board Checkout,  
Test 4  
MOTOR  
TEST  
PROCEDURE  
EXPECTED RESULT  
AND RESPONSE  
MOTOR  
TEST  
PROCEDURE  
EXPECTED RESULT  
AND RESPONSE  
A
Turn enthalpy set point 1. The relays energize. If not,  
A (Outdoor- 1. Connect the enthalpy  
Air Sensor) sensor terminal ϩ to  
Milliammeter reading  
should be between  
potentiometer to the  
A position.  
check return enthalpy re-  
sistor. If resistor is o.k.,  
control board is faulty.  
terminal ϩ on the motor. 3 and 24 mA if the  
2. Connect the positive ter- sensor is operating  
2. Motor drives open. If re-  
lays energize, but motor  
does not drive open, the  
control board is faulty.  
minal of a DC milliam-  
meter to terminal S of  
the sensor.  
correctly. If the read-  
ing is 0 mA, the  
sensor is either  
3. Connect the negative  
wired backward or is  
terminal of a DC milliam- defective.  
meter to terminal SO of  
the enthalpy board.  
B
Turn enthalpy set point 1. The relays deenergize. If  
potentiometer to the  
D position.  
not, control board is faulty.  
2. Motor drives closed. If re-  
lays deenergize by motor  
does not drive closed, the  
control board is faulty.  
B (Indoor- 1. Connect the enthalpy  
Air Sensor) sensor terminal ϩ to  
Milliammeter reading  
should be between  
terminal ϩ on the motor. 3 and 24 mA if the  
2. Connect the positive ter- sensor is operating  
Test 3:  
minal of a DC milliam-  
meter to terminal S of  
the sensor.  
correctly. If the read-  
ing is 0 mA, the  
sensor is either  
1. Apply 24 VAC power to terminals T0 and T2 of the con-  
trol board.  
2. Apply 24 v between terminals 1 and T2, and jumper ter-  
minal T0 to terminal 1.  
3. Connect the negative  
wired backward or is  
terminal of a DC milliam- defective.  
meter to terminal SR of  
3. Remove the mixed-air sensor connected between termi-  
nals S1 and S2, and replace it with a 5490-ohm resistor.  
the enthalpy board.  
4. Remove outdoor-air enthalpy sensor between terminals  
ϩϩ and SO, and replace it with a 1.2 kOhm resistor.  
5. Turn the minimum position potentiometer fully counter-  
clockwise.  
BASIC CHECK — Refer to Fig. 64 for control board com-  
ponent identification.  
6. Turn enthalpy set point potentiometer to the A setting.  
7. Refer to Table 15.  
NOTE: All plugs (except P1) are labeled for easy identifi-  
cation. Plug P1 can be identified by its orange color.  
1. Turn unit power off. Disconnect plug P1 from control board.  
2. Turn unit power on and check voltage across Pin R and  
Pin C at plug P1. If voltage reads 18 to 30 v, skip to  
Step 5.  
Table 15 — Economizer Control Board Checkout,  
Test 3  
MOTOR  
TEST  
PROCEDURE  
EXPECTED RESULT  
AND RESPONSE  
3. Turn unit power off. Disconnect plug P3.  
A
Turn mixed-air potenti- Motor should drive to mid-  
ometer to the midpoint stroke with the set point set  
4. Turn unit power on and measure voltage across wires on  
plug P3, Pins 1 and 2 (wires coming from the unit). If  
voltage reads 18 to 30 v, there is either a bad connection  
between plug P3 and control board, or the control board  
is defective. Verify the connection at this point and pro-  
ceed to Step 5. If there is no voltage, check the circuit  
breaker and transformer in the 24-v control circuit of the  
unit.  
position.  
between 60 and 70 F. If not,  
the control board is faulty.  
B
Turn mixed-air  
potentiometer fully  
counterclockwise.  
Motor drives open, If not, the  
control board is faulty.  
C
Turn mixed-air potenti- Motor drives closed. If not,  
ometer fully clockwise. the control board is faulty.  
5. Turn unit power off and disconnect plug P4 from the con-  
trol board.  
6. Switch scale on meter to read 115 v.  
Test 4  
Refer to Table 16 for the correct procedure for test 4.  
Unit Control Board Checkout — The following tools  
are required to perform the troubleshooting tasks detailed in  
this section:  
7. Turn unit power on and check voltage across Pin 6 on  
plug 4 and unit ground (wires coming from the unit). If  
voltage reads 104 to 122 v, there is adequate power avail-  
able to the board. Verify connection at this point and pro-  
ceed to Step 8. If there is no voltage, check the circuit  
breaker and transformer in the 115-v control circuit of  
the unit.  
8. After verifying that 24-v and 115-v supply power is avail-  
able to the control board, turn unit power off and recon-  
nect plugs P1, P3, and P4. Proceed to Detailed Check section  
below.  
• 1.5-v battery  
• 2 sets of jumper wires with alligator clips  
• Multimeter  
• Toggle switch with 14-in. wires terminated with1⁄4-in. spade  
connectors  
Read these instructions completely before attempting to  
troubleshoot the control board. Failure to follow the steps  
precisely could result in damage to unit, personal in-  
jury, or death.  
DETAILED CHECK  
NOTE: Plug P1 must be disconnected in order to perform  
any of the troubleshooting steps detailed in this section. To  
save time, reconnect plug P1 only after you have completed  
all of the required troubleshooting.  
The control board checkout procedure consists of 2 parts:  
A basic check to verify availability of 24 and 115 v to the  
control board and a detailed check of each circuit within the  
board.  
53  
LEGEND  
CLO  
P
SC  
—
—
—
Compressor Lockout  
Plug  
Safety Circuit  
Fig. 64 — Control Board Component Arrangement  
Symptom: Evaporator fan will not operate.  
Symptom: Condenser fan no. 2-5 will not operate.  
1. Turn unit power off and disconnect plug P1 from the con-  
trol board.  
1. Check operation of condenser fan no. 1. If fan no. 1 op-  
erates properly, the problem is external to the board.  
Symptom: Compressor no. 1 will not operate.  
1. Turn unit power off. Disconnect the 2 wires attached to  
the terminals marked SC1.  
2. Check continuity between the 2 wires. If there is no  
continuity, the problem is external to the control board  
(possibly the pressure switches). If there is continuity, pro-  
ceed to Step 3.  
2. Install a jumper across Pin R and Pin G at plug P1 on the  
control board.  
3. Turn unit power on and check if the indoor (evaporator)  
fan contactor (IFC) coil has been pulled in. If the con-  
tactor has not been pulled in, check the voltage across the  
IFC coil. If there is voltage at this point, the IFC con-  
tactor is defective. If there is no voltage, proceed to  
Step 4.  
3. Reconnect the wires removed in Step 1.  
4. Turn unit power off and disconnect plug P4 from the con-  
trol board.  
4. With the unit power still off, disconnect plug P1 from con-  
trol board. Install a jumper wire across Pin R and Pin Y1  
at plug P1 on the control board.  
5. Connect a voltmeter across the coil for compressor  
no. 1 contactor.  
5. Turn unit power on and check for continuity across  
Pin 6 and Pin 3 at plug P4 on the control board. If there  
is no continuity, the board is defective. Replace control  
board. If there is continuity, then there is a bad con-  
nection between the board and plug P4. Correct the  
connection.  
6. Energize unit and monitor the voltage for a few  
seconds.  
6. Turn unit power off. Reconnect plug P1 (if troubleshoot-  
ing is complete) and plug P4.  
IMPORTANT: Do not run compressor too long.  
Symptom: Condenser fan no. 1 will not operate.  
1. Turn unit power off. Disconnect plugs P1 and P3 from  
the control board.  
2. Check for continuity between Pin 8 at plug P3 on the con-  
trol board and Pin Y1 at plug P1 on the control board. If  
there is no continuity, the board is defective. If there is  
continuity, either the connection is bad between plug P3  
and the control board or the problem is external to the  
board. Reconnect plug P1 (if troubleshooting is com-  
plete) and plug P3 to the board.  
7. a. If proper voltage is indicated at the contactor, but con-  
tactor fails to close, replace contactor.  
b. If voltage is indicated for a few seconds (i.e., the con-  
tactor momentarily pulls in and is then deenergized),  
the compressor lockout (CLO) logic has shut down  
the unit. This is an indication that the board is not sens-  
ing proper compressor current, or that one of the safe-  
ties has tripped. Proceed to Step 8 to verify compres-  
sor lockout logic operation.  
54  
c. If proper voltage is indicated at the contactor and con-  
tactor closes, the board is operating properly.  
8. To verify compressor lockout logic:  
8. To verify compressor lockout logic:  
a. Disconnect CLO sensor wires connected to CLO2 at  
the control board. Check wires for continuity. If there  
is no continuity, replace the sensor.  
b. Connect the multimeter to read voltage between  
Pin X on plug P1 and ground.  
a. Disconnect CLO sensor wires connected to CLO1 at  
the control board. Check wires for continuity. If there  
is no continuity, replace the sensor.  
b. Connect the multimeter to read voltage between  
Pin X at plug P1 and ground.  
c. Turn unit power on and check the multimeter. Within  
a few seconds the meter should indicate 24 v. If it does  
not, the control board is defective and must be  
replaced.  
c. Turn unit power on and check the multimeter. Within  
a few seconds the meter should indicate 24 v. If it does  
not, the control board is defective and must be  
replaced.  
d. Turn unit power off. Connect a fresh 1.5-v battery to  
terminals marked CLO2 as shown in Fig. 65.  
d. Turn unit power off. Use a toggle switch to connect a  
fresh 1.5-v battery to the terminals marked CLO1 as  
shown in Fig. 65.  
The negative (−Ve) pole of the battery must be con-  
nected to the inner terminal, and the positive (±Ve)  
pole must be connected to the outer terminal as shown  
in Fig. 65.  
The negative (−Ve) pole of the battery must be con-  
nected to the inner terminal, and the positive (ϩVe)  
pole must be connected to the outer terminal as shown  
in Fig. 65.  
e. Turn unit power on. Make and break the connection  
between the outer CLO2 terminal and the positive (±Ve)  
pole of the battery.  
f. If the multimeter shows 24 v when the battery is dis-  
connected and no voltage when the battery is con-  
nected, the CLO logic is good. If the multimeter shows  
no change, the CLO logic is defective and the board  
must be replaced. Remove all jumpers and replace all  
plugs except plug P1. (Replace plug P1 only if no fur-  
ther troubleshooting is required.)  
e. Turn unit power on and use the toggle switch to make  
and break the connection between the outer CLO1 ter-  
minal and the positive (ϩVe) pole of the battery.  
f. If the multimeter shows 24 v when the battery is dis-  
connected and no voltage when the battery is con-  
nected, the CLO logic is good. If the multimeter shows  
no change, the CLO logic is defective and the board  
must be replaced.  
Symptom: First or second stage of heating will not operate.  
Symptom: Compressor no. 2 will not operate.  
1. Turn unit power off. Disconnect plugs P1 and P3.  
1. Be sure unit power is off. Disconnect the 2 wires attached  
to the terminals marked SC2.  
2. Check continuity between the 2 wires. If there is no con-  
tinuity, the problem is external to the control board (pos-  
sibly the pressure switches). If there is continuity, proceed  
to Step 3.  
2. Check continuity between Pin W1 at plug P1 and Pin 5  
at plug P3. If there is continuity, the board is good and  
the problem is either the connection at P3, or external to  
the control board. If there is no continuity, the control  
board is defective and must be replaced.  
3. Check continuity between Pin W2 at plug P1 and Pin 7  
at plug P3. If there is continuity, the board is good and  
the problem is either at the connection at plug P3 or ex-  
ternal to the board. If there is not continuity, the board is  
defective and must be replaced. Reconnect plug P3 to the  
control board. (Reconnect plug P1 only if no further trouble-  
shooting is required.)  
3. Reconnect the wires removed in Step 1.  
4. With unit power still off, disconnect plug P1 from the con-  
trol board and install jumper wire across Pins R and Y2  
at plug P1.  
5. Connect a voltmeter across the coil for compressor  
no. 2 contactor.  
6. Energize unit and monitor the voltage for a few  
seconds.  
Symptom: Evaporator fan will not energize on a call for heat.  
1. Turn unit power off. Disconnect plug P1 and plug P4.  
2. Install jumper wire between Pin R and Pin W1 at plug  
P1.  
3. Turn unit power on. Check for continuity between Pin 6  
and Pin 3 at plug P4 on control board.  
IMPORTANT: Do not run compressor too long.  
7. a. If proper voltage is indicated at the contactor, but con-  
tactor fails to close, replace contactor.  
b. If voltage is indicated for a few seconds (i.e., the con-  
tactor momentarily pulls in and is then deenergized),  
the Compressor Lockout (CLO) logic has shut down  
the unit. This is an indication that the board is not sens-  
ing proper compressor current, or that one of the safe-  
ties has tripped. Proceed to Step 8 to verify compres-  
sor lockout logic operation.  
4. If there is no continuity between these points, the board  
is defective and must be replaced.  
NOTE: The control board (part number HK37AA001) has  
no time delay.  
5. If there is continuity between these points, the problem is  
at the connection at plug P4 or external to the control  
board.  
c. If proper voltage is indicated at the contactor and con-  
tactor closes, the board is operating properly.  
6. Turn unit power off. Reconnect plugs P1 and P4.  
55  
LEGEND  
CLO  
P
SC  
—
—
—
Compressor Lockout  
Plug  
Safety Circuit  
Fig. 65 — Compressor Lockout Connections  
56  
LEGEND FOR FIG. 66-73  
ACC  
BP  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Accessory  
IGVM  
LPS  
LS  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Inlet Guide Vanes Motor  
Low-Pressure Switch  
Limit Switch  
Building Pressure  
Contactor  
C
CB  
CCB  
CF  
Circuit Breaker  
Control Circuit Breaker  
Check Filter Switch  
Compressor Lockout  
Common  
Communication Plug  
Compressor  
Condenser  
Control Relay  
LSR  
MG  
Limit Switch Relay  
Main Gas  
MGV  
MM  
Main Gas Valve  
CLO  
COM  
COMM  
COMP  
COND  
CR  
Head Control Pressure Device  
Modulating Power Exhaust Relay  
Main Valve  
MPER  
MV  
NC  
NO  
Normally Closed  
Normally Open  
OFM  
PCB  
PEC  
PEDM  
Outdoor (Condenser) Fan Motor  
Power Exhaust Circuit Breaker  
Power Exhaust Contactor  
Power Exhaust Damper Motor  
Power Exhaust Motor  
Pilot Gas  
CS  
Centrifugal Switch  
Constant Volume  
Duct Pressure  
CV  
DP  
DPT  
DSIO  
DU  
Discharge Pressure Transducer  
High-Voltage Relay Module  
Dummy  
PEM  
PG  
PGV  
PIC  
P, PL  
PS  
PSIO  
PV  
PWR  
RES  
RFC  
RFDM  
RS  
Pilot Gas Valve  
Processor-Integrated Controls  
Plug  
Power Supply (5 VDC)  
Processor Module  
Pilot Valve  
Power  
Resistor  
EC  
EQUIP  
FS  
FU  
GND  
GR  
HHR  
HIR  
HPS  
HR  
HSIO  
HV  
HYD  
I
ICP  
IDC  
IDM  
IFC  
IFCB  
IFM  
IGV  
Enthalpy Control  
Equipment  
Fan Status Switch  
Fuse  
Ground  
Gas Relay  
Hydronic Humidifier Relay  
Heat Interlock Relay  
High-Pressure Switch  
Heater Relay  
Return Fan Contactor  
Return Fan Damper Motor  
Rollout Switch  
Keypad and Display Module  
High Voltage  
Hydronic  
Ignitor  
Ignitor Control Pack  
Induced Draft Contactor  
Induced Draft Motor  
Indoor (Evaporator) Fan Contactor  
Indoor (Evaporator) Fan Circuit Breaker  
Indoor (Evaporator) Fan Motor  
Inlet Guide Vanes  
SEN,SN  
SPT  
SW  
Sensor  
Suction Pressure Transducer  
Switch  
TB  
Terminal Block  
Timed Discrete Output  
Thermostat  
Transformer  
Valve  
Field Wiring  
Factory Wiring  
TDO  
TH  
TRAN  
VLV  
—
57  
Fig. 66 — Gas Heat Sections; 48DJ,NP034,044 Units  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
Fig. 72 — Typical Control Wiring Schematic; 48/50NP,50NB Units (054-074 Shown) (cont)  
68  
69  
PACKAGED SERVICE TRAINING  
Our packaged service training programs provide an excellent way to increase your knowledge of the  
equipment discussed in this manual. Product programs cover:  
• Unit Familiarization  
• Installation Overview  
• Maintenance  
• Operating Sequence  
A large selection of product, theory, and skills programs is available. All programs include a video  
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training  
sessions.  
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are  
included (U.S.A. and Canada only).  
Copyright 1996 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1  
1
PC 111  
Catalog No. 564-818  
Printed in U.S.A.  
Form 48/50D,N-9SI  
Pg 70  
3-96  
Replaces: 48DJ,DK-3SI;  
48/50NB,NP-1SI; 50DJ,DK-9SI  
Tab 1a 1b  
START-UP CHECKLIST  
MODEL NO.:  
DATE:  
SERIAL NO.:  
TECHNICIAN:  
PRE-START-UP:  
Ⅺ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT  
Ⅺ LOOSEN ALL SHIPPING HOLDDOWN BOLTS AND REMOVE SHIPPING BRACKETS PER INSTRUCTIONS  
Ⅺ VERIFY INSTALLATION OF ECONOMIZER HOOD  
Ⅺ VERIFY INSTALLATION OF EXHAUST HOOD  
Ⅺ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS  
Ⅺ VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT  
Ⅺ CHECK GAS PIPING FOR LEAKS (48 SERIES UNITS ONLY)  
Ⅺ CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE  
Ⅺ VERIFY THAT UNIT IS LEVEL  
Ⅺ CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SET SCREW  
IS TIGHT  
Ⅺ VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED  
START-UP  
ELECTRICAL  
SUPPLY VOLTAGE L1-L2  
L2-L3  
L3-L1  
COMPRESSOR AMPS — COMPRESSOR NO. 1 L1  
— COMPRESSOR NO. 2 L1  
L2  
L2  
L3  
L3  
SUPPLY FAN AMPS  
EXHAUST FAN AMPS  
L2  
ELECTRIC HEAT AMPS L1  
L3  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
COOLING SUPPLY AIR  
F
F
F
DB (Dry-Bulb)  
DB  
F
WB (Wet-Bulb)  
GAS HEAT SUPPLY AIR  
(48 SERIES UNITS ONLY)  
F
F
ELECTRIC HEAT SUPPLY AIR  
(IF UNIT IS SO EQUIPPED)  
PRESSURES  
GAS INLET PRESSURE (48 SERIES UNITS ONLY)  
IN. WG  
GAS MANIFOLD PRESSURE  
(48 SERIES UNIT ONLY)  
REFRIGERANT SUCTION  
VALVE NO. 1  
IN. WG  
VALVE NO. 2  
CIRCUIT NO. 2  
CIRCUIT NO. 2  
IN. WG  
PSIG  
CIRCUIT NO. 1  
PSIG  
PSIG  
REFRIGERANT DISCHARGE CIRCUIT NO. 1  
PSIG  
Ⅺ VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 47-49  
GENERAL  
Ⅺ ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS  
Copyright 1996 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1  
1
PC 111  
Catalog No. 564-818  
Printed in U.S.A.  
Form 48/50D,N-9SI  
CL-1  
3-96  
Replaces: 48DJ,DK-3SI;  
48/50NB,NP-1SI; 50DJ,DK-9SI  
Tab 1a 1b  

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