Trane Air Conditioner DFOA User Manual
Make-Up  
Air Units  
Direct-Fired Outdoor  
Model DFOA  
September 2000  
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Contents  
Introduction  
2
4
Features and Benefits  
Unit Configurations  
Application Considerations  
Model Number Description  
Performance Data  
Gas Piping  
6
7
8
9
11  
16  
Controls  
Electric Power  
18  
19  
36  
Dimension and Weights  
Mechanical Specifications  
Options  
Accessories  
37  
43  
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Features and  
Benefits  
Supply air intake view showing inlet hood  
and birdscreen  
Gas burner section  
Optional inlet damper wtih V-bank filter  
Factory assembled gas manifold  
compartment  
Access compartment to control panel and  
fan motor.  
Note: Fan motor panel has been removed for photograph.  
4
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Features and  
Benefits  
Basic Unit  
Gas-Fired Unit  
Feature:  
Feature:  
Casing with galvanized finish  
Benefit:  
Rust problem is greatly reduced  
Many standard, natural gas burning  
units bear the ETL label. Contact  
factory for verification.  
Benefit:  
Feature:  
Meets certain insurance requirements  
Watertight construction  
Benefit:  
Designed for indoor or outdoor  
mounting  
Feature:  
Optional temperature control systems  
available  
Benefit:  
Select system to satisfy application  
Feature:  
Access doors are hinge mounted with  
industrial type hardware  
Benefit:  
Provides simple access to service  
compartments without removing sheet  
metal screws and panels  
Feature:  
Optional dual fuel gas manifold  
Benefit:  
Standby flexibility in case natural gas  
supply is interrupted  
Feature:  
Adjustable motor mount  
Benefit:  
Feature:  
Optional construction provides return  
air cycle  
Belt tension can be field adjusted for  
maximum belt life and for motor speed  
adjustment  
Benefit:  
Maximum 80 percent return air cycle  
results in fuel economy for pressurized  
heating systems and eliminates need for  
two-speed fan operation. Minimizes  
heating costs.  
Feature:  
Basic unit is factory assembled and  
wired  
Benefit:  
Reduces field installation cost  
Feature:  
All fuses factory furnished  
Benefit:  
Delay at start-up eliminated  
Feature:  
Factory tested before being shipped  
Benefit:  
Eliminates majority of field start-up  
problems caused by defective controls  
Feature:  
No flues or stacks are used  
Benefit:  
Eliminates backdraft and dangerous  
contaminants from entering the space  
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Unit  
Configurations  
Horizontal Configurations  
For all arrangements shown, the gas  
piping and controls are on the near side.  
Selected horizontal units are available  
with special options — cooling coils (DX,  
chilled water), steam and electric coils,  
no burner section.  
Vertical Configurations  
For all arrangements shown, the gas  
piping and controls are on the near side.  
The electric control cabinet (EC) and  
disconnect are on the side opposite the  
air entering side. Selected vertical units  
are available with special options —  
steam and electric coils, no burner  
section.  
6
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Application  
Considerations  
Outdoor Units  
What Fuel to Use?  
Outdoor make-up air units are the most  
common approach to relieving negative  
pressure inside commercial and  
industrial facilities. All units offer the  
advantage of a full support system that  
is watertight, provides a plenum for  
return air, and has easily accessible  
piping and electrical connections.  
The most common fuel for heating  
make-up air is natural gas.This is  
because 100 percent of the energy goes  
into the air stream (92 percent sensible, 8  
percent latent). Direct firing eliminates  
the need for heat exchangers or  
combustion chambers that can corrode  
or leak. Natural gas is often the least  
expensive fuel and is usually readily  
available.  
The Need for Make-Up Air Units  
When more air is exhausted from a  
building than is supplied by the  
mechanical systems, the building is  
under a “negative” condition. Air will  
leak into the building through cracks,  
windows, and doors.When a negative  
condition exists:  
Note: Selected horizontal and vertical  
units are available with special coil  
options (DX, chilled water, steam or  
electric).  
1
Flues and stacks may experience a  
backdraft and cause dangerous  
contaminants to remain in the occupied  
space. In the case of flues, the products  
of combustion may condense and  
corrode the equipment.  
2
Under negative conditions, the exhaust  
system sees a greater static pressure.  
The capacity of each fan is reduced and  
this results in an inadequate removal of  
contaminants.  
3
Drafts and cross-currents will increase in  
a negative condition, causing an  
uncomfortable or unhealthy work  
environment.  
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Model  
Num ber  
Description  
D F O A 1 0 9 A N C A 1 A A  
B
1
2
0
0
0
A
1,2,3 4 5,6,7 8 9 10 11 12 13,14 15 16 17 18 19 20 21  
AF = 1375 MBh Input  
AG = 1650 MBh Input  
AH = 1925 MBh Input  
AJ = 2200 MBh Input  
AK = 2475 MBh Input  
AL = 2750 MBh Input  
AN = 3025 MBh Input  
AP = 3300 MBh Input  
AQ = 3575 MBh Input  
AR = 3850 MBh Input  
AT = 4125 MBh Input  
AV = 4400 MBh Input  
AW = 4675 MBh Input  
AX = 4950 MBh Input  
AY = 5225 MBh Input  
AZ = 5500 MBh Input  
A1 = 5775 MBh Input  
A2 = 6050 MBh Input  
A3 = 6325 MBh Input  
A4 = 6600 MBh Input  
A5 = 6875 MBh Input  
A6 = 7150 MBh Input  
A7 = 7425 MBh Input  
A8 = 7700 MBh Input  
A9 = 7975 MBh Input  
SS = Special  
Digit 17 — Fan Discharge*  
Horizontal Arrangement  
Digits 1,2,3 — Unit Description  
DFO = Direct Fired Outdoor Unit  
1 = Arrangement 1,Top  
2 = Arrangement 2, Side  
Digit 4 — Development Sequence  
3 = Arrangement 3, Bottom  
A = First Generation  
*Select arrangem ents from page 6.  
Vertical Arrangement  
Digits 5,6,7 — Unit Size  
4 = Arrangement 4, Side  
5 = Arrangement 5,Top  
109 = Unit Size 109  
112 = Unit Size 112  
115 = Unit Size 115  
118 = Unit Size 118  
215 = Unit Size 215  
218 = Unit Size 218  
220 = Unit Size 220  
222 = Unit Size 222  
225 = Unit Size 225  
230 = Unit Size 230  
SSS = Special Unit Size  
6 = Arrangement 6, Side  
*Select arrangem ents from page 6.  
Digit 18 — Inlet Hood and Birdscreen  
0 = None  
A = Inlet Hood and Birdscreen with  
Permanent Filters  
B = Inlet Hood and Birdscreen without  
Filters  
Digit 19 —V-Bank Filter Section  
Digit 8 — Main Power Supply  
0 = No Selection  
A =V-Bank Filter Section with Permanent  
Filters  
0 = No Selection  
A = 115/60/1  
B = 230/60/1  
C = 208/60/1  
D = 208/60/3  
E = 230/60/3  
F = 460/60/3  
S = Special  
B =V-Bank Filter Section without Filters  
Digit 20 — Dampers/Mixing Box  
Digit 15 — Blower Motor HP  
0 = No Selection  
0 = No Selection  
B = ¾ HP Motor  
C = 1 HP Motor  
D = 1½ HP Motor  
E = 2 HP Motor  
F = 3 HP Motor  
G = 5 HP Motor  
H = 7½ HP Motor  
A = Motorized RA Damper  
B = Motorized 75/25 Damper  
C = Mixing Box —Temperature Control  
D = Mixing Box — Building Pressure  
Control  
Digit 9 — Fuel  
N = Natural Gas  
P = LP Gas (Propane)  
S = Special  
E = Mixing Box — Manual Control  
J
= 10 HP Motor  
Digit 21 — Miscellaneous Options  
Digit 10 — Design Sequence  
K = 15 HP Motor  
L = 20 HP Motor  
M = 25 HP Motor  
P = 30 HP Motor  
Q = 40 HP Motor  
R = 50 HP Motor  
T = 60 HP Motor  
S = Special  
A = Controls Opposite from Standard  
B = Motorized Inlet Damper  
C = Motorized Outlet Damper  
D = Insulation on Basic Frame  
E = Insulation on Filter Section  
F = Internal Blower/Motor Isolation  
G = Extended Grease Lines  
H = Inlet On-Off Duct Stat  
C =Third Design  
Digit 11 — Gas Control Option  
A = Series 14 Constant Discharge  
Temperature  
B = Series 44 SpaceTemperature Control  
S = Special  
K = 115V Duplex Service Receptacle with  
PowerTransformer  
L = Circuit Analyzer  
M = Painted Basic Unit and Accessories  
N = UV Flame Sensor  
P = Clogged Filter Switch with Light  
Q = Exhaust Interlock  
Digit 16 — Motor Speed and Starter  
Digit 12 —Type Gas Train Approvals  
0 = No Selection  
1 = Standard  
3 = IRI  
4 = FM  
1 = Single Speed ODP 1800 RPM  
2 = Single SpeedTEFC 1800 RPM  
3 = Single Speed Energy Efficient ODP  
1800 RPM  
4 = Single Speed Energy EfficientTEFC  
1800 RPM  
5 = 2S1W ODP 1800/900 RPM  
6 = 2S2W ODP 1800/1200 RPM  
S = Special  
S = Special  
R = Interlocking Relay  
Digits 13,14 — Burner Input Rating (MBh)  
T = City of Chicago Controls  
V = Omit Disconnect Switch  
W = High Gas Pressure Regulator 1-5 PSIG  
X = High Gas Pressure Regulator 5-10 PSIG  
Y = Adjustable Drive  
AA = 275 MBh Input  
AB = 550 MBh Input  
AC = 825 MBh Input  
AD = 990 MBh Input  
AE = 1100 MBh Input  
S = Special  
8 = Low Gas Pressure Burner  
8
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Data  
Table PD-1 — Direct-Fired Outdoor Unit  
CFM  
FPM  
Outlet  
Velocity  
1915  
Total External Static Pressure (WC)  
Models  
DFO  
Blower STD Air  
¼”  
3/8”  
½”  
¾”  
1”  
1 ¼” 1 ½” 2”  
Size  
@ 70  
1600  
1800  
2000  
2250  
2500  
2750  
3000  
3250  
3500  
3750  
4000  
4250  
4500  
5000  
5500  
6000  
HP  
¾
1
1
1
1
1
1
1
—
1 ½  
1 ½  
2
—
1 ½  
2
—
—
2
—
—
—
3
2155  
2390  
2690  
2990  
3290  
3585  
2180  
2360  
2540  
2720  
2900  
2190  
2430  
2670  
2910  
1 ½  
1 ½  
2
1 ½  
1 ½  
2
1½  
109  
1-9”  
1 ½ 1 ½  
2
2
2
2
3
2
2
2
3
3
2
3
3
5
2
2
3
2
2
3
3
3
3
3
3
5
2
3
2
3
3
3
3
2
3
3
3
3
3
3
3
5
5
1 ½  
2
2
3
3
3
3
3
3
3
3
5
112  
115  
1-12”  
1-15”  
2
3
3
3
3
5
3
3
3
3
5
5
3
3
3
5
5
5
2
3
3
3
5
—
5
3
3
3
5
5
3
5
5
5
5
5
5
5
5
5
5
7 ½  
6500  
7000  
2215  
2390  
2565  
2740  
2915  
2190  
2310  
2430  
2550  
2670  
2790  
2910  
2125  
2215  
2390  
2565  
2740  
2915  
2140  
2260  
2380  
2500  
2620  
2740  
2860  
2980  
3100  
2450  
2550  
2650  
2750  
2850  
2950  
3050  
2235  
2385  
2535  
2685  
2835  
2985  
3135  
3285  
3430  
2365  
2580  
2800  
3020  
3240  
3440  
3
5
5
5
5
5
5
5
5
5
5
5
5
5
5
7 ½  
7 ½  
7 ½  
7 ½  
10  
—
—
—
—
10  
10  
15  
—
—
—
15  
15  
20  
—
—
20  
20  
20  
20  
25  
25  
25  
25  
25  
25  
30  
30  
30  
30  
—
—
30  
30  
40  
40  
40  
40  
50  
—
—
50  
50  
50  
60  
5
5
5
5
5
7 ½  
7 ½  
7 ½  
7 ½  
—
—
7 ½  
7 ½  
10  
118  
215  
218  
1-18”  
2-15”  
2-18”  
7500  
5
5
5
7 ½  
5
5
5
7 ½  
5
5
7 ½  
7 ½  
7 ½  
—
7 ½  
7 ½  
7 ½  
7 ½  
10  
8000  
5
7 ½  
7 ½  
5
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
10  
8500  
5
9000  
5
9500  
5
5
10000  
10500  
11000  
11500  
12000  
12500  
13000  
14000  
15000  
16000  
17000  
18000  
19000  
20000  
21000  
22000  
23000  
24000  
25000  
26000  
25000  
26000  
27000  
28000  
29000  
30000  
31000  
30000  
32000  
34000  
36000  
38000  
40000  
42000  
44000  
46000  
44000  
48000  
52000  
56000  
60000  
64000  
5
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
10  
10  
10  
15  
10  
10  
15  
15  
15  
15  
15  
20  
20  
15  
20  
20  
20  
20  
20  
25  
15  
20  
20  
20  
25  
25  
30  
30  
40  
25  
25  
30  
40  
40  
50  
5
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
7 ½  
10  
10  
7 ½  
10  
10  
10  
15  
15  
15  
15  
15  
15  
15  
15  
15  
20  
20  
20  
15  
15  
15  
20  
20  
20  
25  
25  
30  
20  
20  
25  
30  
40  
40  
7 ½ 7 ½  
7 ½ 7 ½  
7 ½ 7 ½  
7 ½ 7 ½  
7 ½ 7 ½  
7 ½ 7 ½  
10  
10  
10  
7 ½  
10  
10  
10  
—
10  
—
—
15  
15  
15  
15  
15  
15  
15  
20  
20  
20  
20  
20  
25  
20  
20  
20  
25  
25  
25  
30  
—
25  
25  
30  
30  
30  
40  
40  
40  
—
40  
40  
40  
50  
50  
10  
10  
10  
10  
10  
10  
10  
15  
15  
15  
15  
15  
20  
15  
15  
15  
20  
20  
20  
20  
15  
15  
20  
20  
20  
25  
25  
30  
30  
20  
25  
25  
30  
40  
40  
10  
10  
10  
10  
10  
10  
15  
15  
15  
15  
15  
20  
15  
15  
15  
20  
20  
20  
20  
15  
15  
20  
20  
20  
25  
25  
30  
30  
20  
25  
30  
30  
40  
40  
15  
15  
15  
15  
15  
15  
15  
20  
20  
20  
20  
20  
20  
20  
20  
25  
25  
25  
25  
20  
20  
25  
25  
30  
30  
40  
40  
40  
30  
30  
40  
40  
50  
50  
15  
15  
15  
15  
15  
15  
15  
15  
20  
20  
20  
20  
20  
20  
20  
25  
25  
25  
20  
20  
20  
25  
25  
30  
30  
40  
40  
25  
30  
40  
40  
40  
50  
220  
222  
225  
2-20”  
2-22”  
2-25”  
2-30”  
230  
Notes:  
External Pressure Drop in inches of water. Add pressure drop of the optional accessories, if used, to the pressure drop of the  
duct work.  
Fresh Air Inlet Hood and Birdscreen  
Fresh Air Inlet Hood With Filters  
Motor Operated Inlet Damper  
Motor Operated Discharge Damper  
V-Bank Filter Section  
.13” WC  
.25” WC  
.13” WC  
.13” WC  
.25” WC  
40” WC  
Mixing Box  
.
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Data  
Table PD-2 — Direct-Fired Outdoor Unit — Burner Selection (MBh Input)  
CFM  
Models  
DFO  
Std Air  
70 F  
70 F  
Rise  
131  
80 F  
Rise  
150  
90 F  
Rise  
169  
190  
211  
100 F 110 F 120 F  
Rise  
188 207  
211 232  
Rise  
Rise  
225  
1600  
1800  
148  
169  
254  
2000  
164  
188  
235 258  
264 291  
293 323  
323 355  
352 387  
382 420  
282  
109  
2250  
185  
211  
238  
264  
291  
317  
343  
370  
396  
423  
449  
475  
528  
581  
634  
687  
740  
792  
845  
898  
951  
317  
2500  
205  
235  
352  
2750  
226  
258  
387  
3000  
247  
282  
423  
3250  
267  
305  
458  
3500  
288  
329  
411  
452  
493  
3750  
308  
352  
440 484  
470 517  
499 549  
528 581  
587 646  
646 710  
704 775  
763 839  
822 904  
880 968  
939 1033  
998 1098  
1057 1162  
528  
112  
115  
4000  
329  
376  
563  
4250  
349  
399  
599  
4500  
370  
423  
634  
5000  
411  
470  
704  
5500  
452  
517  
775  
6000  
493  
563  
845  
6500  
534  
610  
916  
7000  
575  
657  
986  
7500  
616  
704  
1057  
1127  
1197  
1268  
1338  
1409  
1479  
1550  
1620  
1690  
1761  
1831  
1972  
2113  
2254  
2395  
2536  
2677  
2817  
2958  
3099  
3240  
3381  
3522  
3663  
3522  
3663  
3803  
3944  
4085  
4226  
4367  
4226  
4508  
4790  
5071  
5353  
5635  
5917  
6198  
6480  
6198  
6762  
7325  
—
118  
8000  
657  
751  
8500  
698  
798  
9000  
740  
845  
9500  
781  
892  
1004 1115 1227  
1057 1174 1291  
1109  
1162  
10000  
10500  
11000  
11500  
12000  
12500  
13000  
14000  
15000  
16000  
17000  
18000  
19000  
20000  
21000  
22000  
23000  
24000  
25000  
26000  
25000  
26000  
27000  
28000  
29000  
30000  
31000  
30000  
32000  
34000  
36000  
38000  
40000  
42000  
44000  
46000  
44000  
48000  
52000  
56000  
60000  
64000  
822  
939  
215  
863  
986  
1233 1356  
1291 1420  
904  
1033  
1080  
1127  
1174  
1221  
1315  
1409  
1503  
1597  
1690  
1784  
1878  
1972  
2066  
2160  
2254  
2348  
2442  
2348  
2442  
2536  
2630  
2723  
2817  
2911  
2817  
3005  
3193  
3381  
3569  
3757  
3944  
4132  
4320  
4132  
4508  
4883  
5259  
5635  
6010  
945  
1215 1350 1485  
1268 1409 1550  
1321 1467 1614  
1373 1526 1679  
1479 1643 1808  
1585 1761 1937  
1690 1878 2066  
1796 1996 2195  
1902 2113 2324  
2007 2230 2453  
986  
1027  
1068  
1150  
1233  
1315  
1397  
1479  
1561  
1643  
1726  
1808  
1890  
1972  
2054  
2137  
2054  
2137  
2219  
2301  
2383  
2465  
2547  
2465  
2630  
2794  
2958  
3123  
3287  
3451  
3616  
3780  
3616  
3944  
4273  
4602  
4930  
5259  
218  
220  
2113  
2348 2583  
2219 2465 2712  
2324 2583 2841  
2430 2700 2970  
2536 2817 3099  
2641 2935 3228  
2747 3052 3357  
2641 2935 3228  
2747 3052 3357  
2853 3170 3487  
2958 3287 3616  
3064 3404 3745  
3170 3522 3874  
3275 3639 4003  
3170 3522 3874  
3381 3757 4132  
3592 3991 4390  
3803 4226 4649  
4015 4461 4907  
4226 4696 5165  
4437 4930 5423  
4649 5165 5682  
4860 5400 5940  
4649 5165 5682  
5071 5635 6198  
5494 6104 6715  
5917 6574 7231  
6339 7043 7748  
222  
225  
230  
—
6762 7513  
—
—
Notes:  
1. Determine the temperature rise required through the heater by subtracting winter design temperature from the desired  
indoor temperature.  
2. Select burner required:  
BTUH  
= CFM x T x 1.08  
.92  
Formula includes 1.08 constant for heat content of air and .92 factor which is an average ratio of net and gross heating  
values of common fuel gases. (92% sensible, 8% latent).  
3. Contact Diversified Commercial Products Technical Support on temperature rise requirements greater than 120 F.  
10  
MUA-PRC001-EN  
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Gas  
Piping  
Com ponent Identification  
GP-09 Pilot Gas Pressure Regulator  
Notes:  
GP-11  
GP-13  
GP-17  
GP-18  
Main Gas ShutoffValve  
Pilot Gas ShutoffValve  
Auxiliary Gas ShutoffValve  
Auxiliary Gas ShutoffValve  
1
4
Vents to outside furnished by factory  
on outdoor units.  
For inlet pressure under 10” WC, contact  
factory.  
5
Contact factory for manifold required for  
CGA.  
2
GP-27 Orificed Needle Valve  
VG-01 Pilot Gas Valve  
VG-02 Main Gas Valve  
VG-03 Auxiliary Gas Valve  
Under 825 MBh will require an additional  
gas pressure regulator if inlet  
pressure exceeds 1 psig.  
3
*Items PS-04, PS-07, VG-04 and GP-18 are not required to  
meet IRI requirements if the unit is ETL approved. Refer to  
page 40.  
VG-04 N/OVentValve  
4400 MBh and above will require a  
minimum inlet pressure of 1 psig. For  
inlet pressure under 1 psig, contact  
factory.  
VG-07 Maxitrol Modulating Valve  
PS-04 Low Gas Pressure Switch  
PS-07 High Gas Pressure Switch  
MUA-PRC001-EN  
11  
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Gas  
Piping  
Table GP-1— Gas Pressure Regulator Selection  
If Burner Size (BS) Is:  
BS < 825  
And Gas Pressure (GP) Is:  
GP< 7” WC  
Then:  
Call factory to verify availability and pricing  
7”WC < GP < 10” WC  
10”WC < GP < 1 PSI  
1 PSI < GP < 5 PSI  
5 PSI < GP < 10 PSI  
10 PSI < GP < 50 PSI  
50 PSI < GP  
Use low gas pressure burner  
No low gas pressure burner or high gas pressure regulator required  
Use high gas pressure regulator 1-5 PSI  
Use high gas pressure regulator 5-10 PSI  
Use high gas pressure regulator over 10 PSI  
Call factory to verify availability and pricing  
Call factory to verify availability and pricing  
Use low gas pressure burner  
990 < BS < 4125  
GP < 7” WC  
7” WC < GP < 10” WC  
10” WC < GP < 5 PSI  
5 PSI < GP < 10 PSI  
10 PSI < GP < 50 PSI  
50 PSI < GP  
No low gas pressure burner or high gas pressure regulator required  
Use high gas pressure regulator 5-10 PSI  
Use high gas pressure regulator over 10 PSI  
Call factory to verify availability and pricing  
Call factory to verify availability and pricing  
No low gas pressure burner or high gas pressure regulator required  
Use high gas pressure regulator 5-10 PSI  
4400 < BS < 7975  
GP < 1 PSI  
1 PSI < GP < 5 PSI  
5 PSI < GP < 10 PSI  
10 PSI < GP < 50 PSI  
50 PSI < GP  
Use high gas pressure regulator over 10 PSI  
Call factory to verify availability and pricing  
12  
MUA-PRC001-EN  
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Gas  
Piping  
Table GP-2 — Gas Pipe Connection Size — Direct-Fired Units — IRI Gas Train — R/A Meeting ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1"  
1 ¼"  
2"  
2"  
2"  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼“  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼”  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
N/A  
N/A  
N/A  
2 ½"  
3"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Table GP-3 — Gas Pipe Connection Size — Direct-Fired Units — FM Gas Train — R/A Meeting ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1"  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1 ¼"  
1 ½"  
2"  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ½"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ½"  
1¼"  
1¼"  
1¼"  
1¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ½"  
1¼"  
1¼"  
1¼"  
1¼"  
1¼"  
1¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
2"  
2"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
MUA-PRC001-EN  
13  
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Gas  
Piping  
Table GP-4 — Gas Pipe Connection Size — Direct-Fired Units — Standard Gas Train — R/A Meeting ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1"  
1 ¼"  
1 ½"  
2"  
2"  
2"  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3
3
3
3
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
3
3
N/A  
N/A  
N/A  
Table GP-5 — Gas Pipe Connection Size — Direct-Fired Units — IRI Gas Train — 100% OA or R/A Not ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1 ¼"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
N/A  
1 ½"  
2"  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
12,100  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
14  
MUA-PRC001-EN  
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Gas  
Piping  
Table GP-6 — Gas Pipe Connection Size— Direct-Fired Units — FM Gas Train — 100% OA or R/A Not ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1 ¼"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
1 ¼"  
2"  
1"  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
2"  
2"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
12,100  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
Note:  
CF = Contact Factory  
Table GP-7 — Gas Pipe Connection Size— Direct-Fired Units — Standard Gas Train — 100% OA or R/A Not ETL  
Inlet Gas Pressure (inches of water column)  
MBH  
275  
6-7"  
1 ¼"  
1 ¼"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
8-11"  
¾"  
12-14"  
¾"  
15-20"  
¾"  
21-27"  
¾"  
1 psi  
¾"  
2 psi  
¾"  
3 psi  
¾"  
4 psi  
¾"  
5 psi  
¾"  
550  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
825  
N/A  
2"  
2"  
2"  
1"  
1"  
¾"  
¾"  
¾"  
¾"  
¾"  
¾"  
1,100  
1,375  
1,650  
1,925  
2,200  
2,475  
2,750  
3,025  
3,300  
3,575  
3,850  
4,125  
4,400  
4,675  
4,950  
5,225  
5,500  
5,775  
6,050  
6,325  
6,600  
6,875  
7,150  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ½"  
1 ½"  
1 ½"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
1 ¼"  
2"  
N/A  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
2 ½"  
3"  
3"  
3"  
7,700  
8,250  
8,800  
9,350  
9,900  
10,450  
11,000  
11,550  
12,100  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
N/A  
N/A  
N/A  
N/A  
N/A  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
3"  
N/A  
N/A  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
CF  
Note:  
CF=Contact Factory  
MUA-PRC001-EN  
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Controls  
System 14 — Constant Discharge AirTemperatures  
Optional  
System 14 Applications  
Fan Sw itch On  
Component Description  
1
Rem ote Tem perature Selector  
Not temperature sensitive. Mounted on  
remote control station.  
2
Air Sensor  
Installed in blower discharge.  
3
Controls discharge air temperature with  
instantaneous response and is ideal for  
industrial areas and commercial spaces  
such as kitchens, hotels, restaurants and  
boiler rooms.  
Optional damper opens, damper end  
switch closes, fan motor starter is  
energized, fan runs.  
The freeze-stat will stop the fan if the  
discharge leaving air temperature is  
below 45 F, three minutes after the fan is  
turned on.  
Control Operation  
Desired temperature at is set at the  
remote temperature selector .The air  
sensor senses leaving air temperature  
and sends an electrical signal to the  
amplifier .The amplifier then sends an  
electrical signal to the modulator/  
regulator valve , which adjusts gas  
pressure to the burner, maintaining the  
Am plifier  
Fan Sw itch Off  
Installed in electrical control panel.  
Contains wiring terminals, sensitivity  
adjustments and one calibrating  
potentiometer.  
Optional damper closes, damper end  
switch opens, fan motor starter is de-  
energized, fan is off.  
Heat Sw itch On  
4
Modulator/Regulator Valve  
Mounted in gas piping manifold.  
Receives electrical signal from amplifier  
and adjusts gas pressure to maintain  
desired temperature.  
5
If the fan switch is on, and the air flow  
switch closes, power is applied to the  
flame failure safeguard relay to begin  
predetermined ignition sequence.  
desired temperature at  
.
Control Sequence w ith Fan and  
Heat Sw itches  
Fan and heat switches are included  
when a remote control station is ordered  
as an option.  
Note: The fan switch must be on, or the  
burner will not light, even if the heat  
switch is on.  
Rem ote Control Station  
Optional  
Heat Sw itch Off  
Heat is off.  
16  
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Controls  
System 44 — Space Temperature Control  
Optional  
Com ponent Description  
1
System 44 Applications  
Fan Sw itch On  
Provides space temperature control  
electronically and is ideal for commercial  
and industrial buildings.  
Selectrastat™  
Optional damper opens, damper end  
switch closes, fan motor starter is  
energized, fan runs.  
Mounted on remote control station in  
heated area where temperature is  
sensed.Temperature range 55 F to 90 F.  
2
Air Monitor  
Installed in blower discharge. Senses  
temperature.  
Tem perature Control Operation  
Desired temperature at is set at the  
Selectrastat on the remote control  
station.The Selectrastat controls the  
discharge air temperature as long as this  
temperature remains within preset  
maximum and minimum limits. If the  
discharge air temperature approaches  
either of the set limits, the discharge air  
monitor will signal the amplifier  
which will adjust the discharge air  
temperature to a higher or lower level  
via the modulator/regulator valve  
When the space temperature  
approaches the assigned setting, the  
The freeze-stat will stop the fan if the  
discharge leaving air temperature is  
below 45 F, three minutes after the fan is  
turned on.  
Fan Sw itch Off  
3
Optional damper closes, damper end  
switch opens, fan motor starter is de-  
energized, fan is off.  
Am plifier  
Installed in electrical control panel.  
Contains adjustments for maximum and  
minimum discharge air temperature,  
three calibrating potentiometers and a  
sensitivity adjustment.  
4
Modulator/Regulator Valve  
Mounts in gas piping manifold. Receives  
electrical signal from amplifier and  
adjusts gas pressure to maintain desired  
temperature.  
,
Heat Sw itch On  
If the fan switch is on, and the air flow  
switch closes, power is applied to the  
flame failure safeguard relay to begin  
predetermined ignition sequence.  
.
Note: The fan switch must be on, or the  
burner will not light, even if the heat  
switch is on.  
Selectrastat resumes control.  
Control Sequence w ith Fan and  
Heat Sw itches  
Fan and heat switches are included  
when the remote control station is  
ordered as an option.  
5
Heat Sw itch Off  
Heat is off.  
Rem ote Control Station  
Optional  
MUA-PRC001-EN  
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Electric  
Power  
Table EP-1 — Motor Electrical Data — Single-Speed Motor  
Energy-Effic. ODP  
1800 RPM  
TEFC  
1800 RPM  
3-Phase  
230  
Energy-Effic.TEFC  
1800 RPM  
ODP — 1800 RPM  
Single Phase  
208  
3-Phase  
230  
3-Phase  
3-Phase  
HP  
¾
115  
11.0  
12.6  
20.0  
21.0  
32.0  
NA  
NA  
NA  
NA  
NA  
NA  
NA  
NA  
NA  
NA  
230  
5.5  
208  
2.5  
460  
1.3  
208  
230  
NA  
460  
208  
3.2  
460  
1.5  
208  
230  
NA  
460  
5.4  
2.6  
NA  
3.1  
NA  
1.4  
3.0  
NA  
3.1  
NA  
1.35  
1.95  
2.65  
3.8  
1
6.2  
6.3  
3.5  
2.8  
1.4  
2.7  
3.6  
2.8  
1.4  
2.7  
1 ½  
2
3
5
7 ½  
10  
15  
20  
25  
30  
40  
50  
60  
Notes:  
10.5  
12.6  
16.8  
25.0  
33.0  
NA  
10.0  
10.5  
16.0  
23.0  
31.0  
42.0  
NA  
NA  
NA  
NA  
NA  
NA  
NA  
5.0  
6.3  
4.2  
2.1  
4.5  
3.9  
2.0  
5.0  
4.2  
2.1  
4.5  
3.9  
5.6  
2.8  
6.0  
5.2  
2.6  
6.5  
5.6  
2.8  
6.1  
5.3  
9.5  
8.0  
4.0  
8.7  
7.8  
3.9  
8.5  
8.2  
4.1  
8.8  
7.6  
15.4  
22.0  
26.4  
42.0  
53.0  
72.0  
78.0  
108.0  
140.0  
NA  
13.2  
20.0  
25.2  
40.6  
50.0  
59.0  
71.0  
95.6  
120.0  
145.0  
6.6  
13.8  
22.5  
28.0  
42.1  
55.2  
67.3  
81.0  
NA  
NA  
NA  
12.0  
19.6  
24.4  
36.6  
48.0  
57.0  
69.0  
92.0  
116.0  
144.0  
6.0  
15.0  
21.5  
28.0  
NA  
NA  
NA  
NA  
NA  
13.4  
6.7  
14.2  
21.4  
29.0  
41.2  
53.8  
63.5  
79.8  
NA  
NA  
NA  
12.4  
18.6  
25.0  
36.6  
49.0  
57.0  
69.0  
92.0  
116.0  
142.0  
6.2  
9.3  
10.0  
12.6  
20.3  
25.0  
29.5  
35.5  
47.8  
60.0  
72.5  
9.8  
19.2  
9.6  
12.2  
18.3  
24.0  
28.5  
34.5  
46.0  
58.0  
72.0  
25.2  
38.8  
48.0  
60.0  
76.0  
12.6  
19.4  
24.0  
30.0  
38.0  
47.0  
60.0  
70.0  
12.5  
18.3  
24.5  
28.5  
34.5  
46.0  
58.0  
71.0  
NA  
NA  
NA  
NA  
NA  
94.0  
NA  
NA 120.0  
NA 140.0  
NA  
NA = Not Available  
FLA based on NEC ratings  
Table EP-2— Motor Electrical Data —Two-Speed Motor  
2-Speed/1-Winding  
1800/900 RPM  
3-Phase  
2-Speed/2-Winding  
1800/1200 RPM  
3-Phase  
230  
HP  
208  
230  
460  
NA  
208  
460  
¾
NA  
NA  
NA  
NA  
NA  
1
3.5/1.5  
5.0/2.1  
6.2/2.6  
9.1/3.3  
14.7/5.2  
24.0/10.0  
29.5/11.3  
43.0/15.2  
56.0/20.0  
NA  
3.4/1.6  
4.8/2.1  
6.4/2.7  
8.3/3.3  
13.4/5.1  
24.5/11.0  
30.0/12.4  
40.0/14.0  
54.0/21.0  
NA  
1.8/.75  
3.2/1.8  
5.0/2.9  
6.1/3.5  
9.0/4.8  
16.9/9.7  
22.0/12.3  
30.0/17.0  
47.0/22.0  
56.0/29.0  
NA  
3.4/2.2  
1.7/1.1  
2.4/1.4  
3.4/2.1  
4.6/2.6  
7.1/4.8  
10.0/6.0  
13.5/7.5  
19.0/11.0  
24.0/12.0  
30.0/17.0  
38.0/18.0  
48.0/24.0  
59.0/30.0  
NA  
1 ½  
2.25/.95  
3.0/1.3  
4.9/1.9  
7.0/2.7  
10.5/4.2  
13.0/5.5  
19.4/7.2  
26.0/10.0  
31.0/10.0  
36.6/12.4  
50.0/16.5  
59.0/21.0  
NA  
4.9/2.8  
2
5.9/3.8  
3
8.4/4.8  
5
15.5/10.2  
19.5/12.3  
28.0/17.5  
54.0/21.0  
51.0/27.0  
NA  
7 ½  
10  
15  
20  
25  
30  
NA  
NA  
NA  
NA  
40  
NA  
NA  
NA  
NA  
50  
NA  
NA  
NA  
NA  
60  
NA  
NA  
NA  
NA  
Notes:  
NA = Not Available  
FLA based on NEC ratings  
18  
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Dim ension and  
Weights  
HorizontalArrangement — Single Blower  
109 112 115 118  
Inlet Hood Support (By Others)  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer  
corners of the hood.The supports can  
be bolted to the hood.  
Item  
1
2
3
4
5
6
7
8
Unit Components  
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation pad  
may be put between the base and the  
roof.  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
9
10  
11  
Unit Base  
Table DW-1  
Model  
109  
A
B
C
E
F
G
H
L
M
R
S
T
3' 0" 4' 4" 6' 5" 10-3/8  
(914) (1321) (1956) (264) (384) (367) (297) (368) (303) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 1-9/16" 1' 1-9/16" 1' 2-7/16" 11-11/16" 1' 0-5/8" 1' 3-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (344) (344) (367) (297) (321) (405) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 4" 1' 0-3/8" 1' 7-7/8 6-15/16 11-1/8" 1' 6-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (406) (314) (505) (176) (283) (481) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 7" 1' 0-3/8" 1' 7-7/8 6-15/16 7-7/8" 1' 10-1/16" 1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (483) (314) (505) (176) (200) (560) (533) (838) (737)  
"
1' 3-1/8" 1' 2-7/16" 11-11/16" 1' 2-½" 11-15/16  
"
1' 9" 2' 9" 2' 5"  
112  
115  
"
"
"
"
118  
"
"
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 3’ for serviceability clearance.  
MUA-PRC001-EN  
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Dim ension and  
Weights  
Horizontal Arrangement — Double Blower  
215 218 220 222 225 230  
Item  
1
2
3
4
5
6
7
Unit Components  
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
Inlet Hood Support (By Others)  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation pad  
may be put between the base and the  
roof.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer  
corners of the hood.The supports can  
be bolted to the hood.  
8
9
10  
11  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
Unit Base  
Table DW-2  
Model  
A
B
C
E
F
G
H
J
L
M
R
S
T
U
X
Y
215  
3' 0"  
(914)  
3' 0"  
7' 10"  
6' 5"  
1' 4"  
1' 0-3/8  
(314)  
1' 0-3/8  
(314)  
"
1' 7-7/8  
"
7-1/8  
"
1' 10-½"  
(572)  
1' 4"  
7-7/8  
"
1' 6-15/16  
(481)  
"
1' 9"  
(533)  
1' 9"  
(533)  
2' 7"  
(787)  
2' 7"  
(787)  
2' 9"  
(838)  
2' 9"  
(838)  
3' 2"  
(965)  
3' 2"  
(965)  
2' 9"  
(838)  
2' 9"  
(838)  
3' 3"  
(991)  
3' 3"  
(991)  
4' 3"  
1' 9"  
(533)  
1' 9"  
(533)  
2' 7"  
(787)  
2' 7"  
(787)  
1' 8"  
4-½" 5-¾"  
(114) (146)  
(2388)  
7' 10"  
(1956)  
6' 5"  
(406)  
1' 7"  
(505)  
(181)  
(200)  
¾
218  
"
1' 7-7/8  
(505)  
"
7-1/8  
"
7-7/8  
"
1' 10-1/16  
(560)  
"
4-1/2" 5- "  
(914)  
4' 0"  
(2388)  
10' 10"  
(3302)  
10' 10"  
(3302)  
12' 10"  
(3912)  
12' 10"  
(3912)  
(1956)  
8' 0"  
(483)  
2' 0-7/8  
(632)  
2' 3-3/8  
(695)  
(181)  
11-½"  
(292)  
11-½"  
(292)  
(406)  
2' 5-½"  
(749)  
(200)  
(114) (146)  
220  
"
"
1' 1-3/16  
(335)  
"
"
"
"
2' 4-¼"  
(718)  
1' 0-3/8  
(314)  
"
2' 1-1/16  
(637)  
"
0' 8" 7-1/8  
"
(1219)  
4' 0"  
(2438)  
8' 0"  
(203) (181)  
222  
1' 1-3/16  
(335)  
2' 4-¼"  
(718)  
2' 0-5/8  
(625)  
"
1' 0-3/8  
(314)  
"
"
"
2' 3-9/16  
(700)  
”
0' 8" 7-1/8  
"
(1219)  
5' 0"  
(2438)  
8' 0"  
(203) (181)  
1' 2" 6-¼"  
(356) (159)  
1' 2" 6-¼"  
(356) (159)  
225  
2' 7-3/8  
"
1' 5-9/16  
(446)  
3' 1-¾"  
(959)  
1' 2-½" 3' 1-5/8  
"
1' 3-3/8  
(391)  
1' 3-3/8  
(391)  
2' 7-½" 2' 1-¾" 2' 9"  
(1524)  
5' 0"  
(1524)  
(2438)  
8' 0"  
(2438)  
(797)  
(368)  
(956)  
(800)  
3' 1"  
(940)  
(654)  
2' 1-¾" 2' 9"  
(654) (838) (1295) (508)  
(838) (1295) (508)  
230  
3' 0-7/8  
(937)  
"
1' 5-9/16  
(446)  
3' 1-¾"  
(959)  
1' 2-½" 2' 2-5/8  
"
4' 3" 1' 8"  
(368)  
(676)  
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 5’ for serviceability clearance.  
3. Supply duct connection (by others) to be “pants-legged” from unit discharge.  
20  
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Dim ension and  
Weights  
Horizontal Arrangement — Single Blower  
Return Air Opening Downstream of Burner  
Motorized Return Air Damper — Motorized 75/25 Damper  
109 112 115 118  
Item  
1
2
3
4
5
6
7
8
Unit Components  
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
Inlet Hood Support (By Others)  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer  
corners of the hood.The supports can  
be bolted to the hood.  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation pad  
may be put between the base and the  
roof.  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
9
10  
11  
Unit Base  
Table DW-3  
Model  
109  
A
B
C
E
F
G
H
L
M
R
S
T
3' 0" 4' 4" 6' 5" 10-3/8  
(914) (1321) (1956) (264) (384) (367) (297) (368) (303) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 1-9/16" 1' 1-9/16" 1' 2-7/16" 11-11/16" 1' 0-5/8" 1' 3-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (344) (344) (367) (297) (321) (405) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 4" 1' 0-3/8" 1' 7-7/8 6-15/16 11-1/8" 1' 6-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (406) (314) (505) (176) (283) (481) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 7" 1' 0-3/8" 1' 7-7/8 6-15/16 7-7/8" 1' 10-1/16" 1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (483) (314) (505) (176) (200) (560) (533) (838) (737)  
"
1' 3-1/8" 1' 2-7/16" 11-11/16" 1' 2-½" 11-15/16  
"
1' 9" 2' 9" 2' 5"  
112  
115  
"
"
"
"
118  
"
"
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 3’ for serviceability clearance.  
MUA-PRC001-EN  
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Dim ension and  
Weights  
Horizontal Arrangement — Double Blower  
Return Air Opening Downstream of Burner  
Motorized Return Air Damper — Motorized 75/25 Damper  
215 218 220 222 225 230  
Inlet Hood Support (By Others)  
Item  
Unit Components  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer corners  
of the hood.The supports can be bolted  
to the hood.  
1
2
3
4
5
6
7
8
9
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation pad  
may be put between the base and the  
roof.  
10  
11  
Unit Base  
Table DW-4  
Model  
215  
A
B
C
E
F
G
H
J
L
M
N
P
R
S
T
U
W
X
Y
¼
3' 0" 7' 10" 6' 5"  
(914) (2388) (1956) (406)  
3' 0" 7' 10" 6' 5"  
1' 7" 1' 0-3/8  
1' 4" 1' 0-3/8  
(314)  
"
1' 7-7/8  
"
7-1/8  
"
1' 10-½" 7-7/8  
"
1’6-15/16  
(481)  
"
1' 7" 5' 5-¾" 1’9”  
(483) (1670) (533) (838) 737) (533) (362) (114) (146)  
1' 7" 5' 5-¾" 1’9” 2’9” 2’5” 1’9” 1' 2-¼" 4-½" 5-¾"  
(483) (1670) (533) (838) 737) (533) (362) (114) (146)  
1' 7" 7' 3-3/8 3’2” 3’3” 2’7” 1' 2-¼" 0' 8" 7-1/8  
2’9”  
(483) (2219) (838) (965) (991) (787) (362) (203) (181)  
1' 7" 7' 3-3/8 3’2” 3’3” 2’7” 1' 2-¼" 0' 8" 7-1/8  
2’9”  
(483) (2219) (838) (965) (991) (787) (362) (203) (181)  
9' 3-3/8  
2’1-¾” 3’2” 4’3” 1’8” 1' 8-¼" 1' 2" 6-¼"  
(300) (2829) (654) (965) (1295) (508) (514) (356) (159)  
3' 1" 11-13/16 9' 3-3/8  
2’1-¾” 2’9” 4’3” 1’8” 1' 8-¼" 1' 2" 6-¼"  
(940) (300) (2829) (654) (838) (1295) (508) (514) (356) (159)  
2’9” 2’5” 1’9” 1' 2- " 4-½" 5-¾"  
(505) (181)  
(572)  
1' 4"  
(406)  
(200)  
7-7/8  
(200)  
218  
"
1' 7-7/8  
"
7-1/8  
"
"
1’10-1/16  
(560)  
"
(914) (2388) (1956) (483)  
(314)  
(505) (181)  
220 4' 0" 10' 10" 8' 0" 2' 0-7/8  
(1219) (3302) (2438) (632)  
"
1' 1-3/16  
(335)  
"
"
"
"
2' 4-¼" 11-½" 2' 5-½" 1' 0-3/8  
"
"
"
2’1-1/16  
(637)  
"
"
"
(718) (292)  
(749)  
(314)  
1' 0-3/8  
(314)  
222 4' 0" 10' 10" 8' 0" 2' 3-3/8  
(1219) (3302) (2438) (695)  
"
1' 1-3/16  
(335)  
2' 4-¼" 11-½" 2' 0-5/8  
"
2' 3-9/16  
(700)  
"
"
"
(718) (292)  
(625)  
225 5' 0" 12' 10" 8' 0" 2' 7-3/8  
"
1' 5-9/16  
(446)  
3' 1-¾" 1' 2-½" 3' 1-5/8  
"
1' 3-3/8  
2' 7-½" 11-13/16  
"
"
(1524) (3912) (2438) (797)  
(959) (368)  
(956)  
(391)  
(800)  
230 5' 0" 12' 10" 8' 0" 3' 0-7/8  
(1524) (3912) (2438) (937)  
"
1' 5-9/16  
(446)  
3' 1-¾" 1' 2-½" 2' 2-5/8  
"
1' 3-3/8  
(391)  
"
"
"
(959) (368)  
(676)  
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 5’ for serviceability clearance.  
3. Supply duct connection (by others) to be “pants-legged”from unit discharge.  
22  
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Dim ension and  
Weights  
Horizontal Arrangement — Single Blower  
With Mixing Box  
109 112 115 118  
Inlet Hood Support (By Others)  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer  
corners of the hood.The supports can  
be bolted to the hood.  
Item  
1
2
3
4
5
6
7
8
Unit Components  
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation  
pad may be put between the base  
and the roof.  
9
10  
11  
Unit Base  
Table DW-5  
Model  
109  
A
B
C
E
F
G
H
L
M
R
S
T
3' 0" 4' 4" 6' 5" 10-3/8  
(914) (1321) (1956) (264) (384) (367) (297) (368) (303) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 1-9/16" 1' 1-9/16" 1' 2-7/16" 11-11/16" 1' 0-5/8" 1' 3-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (344) (344) (367) (297) (321) (405) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 4" 1' 0-3/8" 1' 7-7/8 6-15/16 11-1/8" 1' 6-15/16  
1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (406) (314) (505) (176) (283) (481) (533) (838) (737)  
3' 0" 4' 4" 6' 5" 1' 7" 1' 0-3/8" 1' 7-7/8 6-15/16 7-7/8" 1' 10-1/16" 1' 9" 2' 9" 2' 5"  
(914) (1321) (1956) (483) (314) (505) (176) (200) (560) (533) (838) (737)  
"
1' 3-1/8" 1' 2-7/16" 11-11/16" 1' 2-½" 11-15/16  
"
1' 9" 2' 9" 2' 5"  
112  
115  
"
"
"
"
118  
"
"
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 3’ for serviceability clearance.  
MUA-PRC001-EN  
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Dim ension and  
Weights  
Horizontal Arrangement — Double Blower  
With Mixing Box  
215 218 220 222 225 230  
Item  
1
2
3
4
5
6
7
Unit Components  
Centrifugal Supply Fan  
Fan Motor  
Heat Source (Line Burner)  
Control Cabinet  
Hinged Control Cabinet Access Door  
Motor and Drive Access Plate  
Access Door  
Inlet Hood Support (By Others)  
• The purpose of hood support is to  
support the weight of the unit  
accessories which are attached to the  
inlet of the basic unit.  
• The bottom of the angle iron support  
should be fitted with a base.The base  
can sit on the roof and does not have  
to be fixed to the roof. An isolation  
pad may be put between the base  
and the roof.  
• The hood support can be made from  
two, 2” x 2” x ¼” angle iron.  
• One angle iron support should be  
located in, or close to, the outer corners  
of the hood.The supports can be bolted  
to the hood.  
8
9
10  
11  
Removable Suspension Lifting Lug  
Manifold Compartment  
Observation Port  
Unit Base  
Table DW-6  
Model  
A
B
C
E
F
G
H
J
L
M
R
S
T
U
X
Y
215  
3' 0"  
(914)  
3' 0"  
7' 10"  
6' 5"  
1' 4"  
1' 0-3/8  
(314)  
1' 0-3/8  
(314)  
"
1' 7-7/8  
"
7-1/8  
"
1' 10-½"  
(572)  
1' 4"  
7-7/8  
"
1' 6-15/16  
(481)  
"
1' 9"  
(533)  
1' 9"  
(533)  
2' 7"  
(787)  
2' 7"  
(787)  
2' 9"  
(838)  
2' 9"  
(838)  
3' 2"  
(965)  
3' 2"  
(965)  
2' 9"  
(838)  
2' 9"  
(838)  
3' 3"  
(991)  
3' 3"  
(991)  
4' 3"  
1' 9"  
(533)  
1' 9"  
(533)  
2' 7"  
(787)  
2' 7"  
(787)  
1' 8"  
4-½" 5-¾"  
(114) (146)  
4-½" 5-¾"  
(114) (146)  
(2388)  
7' 10"  
(1956)  
6' 5"  
(1956)  
8' 0"  
(406)  
1' 7"  
(505)  
(181)  
(200)  
218  
"
1' 7-7/8  
(505)  
"
7-1/8  
"
7-7/8  
"
1' 10-1/16  
(560)  
"
(914)  
4' 0"  
(2388)  
10' 10"  
(3302)  
10' 10"  
(3302)  
12' 10"  
(3912)  
12' 10"  
(3912)  
(483)  
2' 0-7/8  
(632)  
2' 3-3/8  
(695)  
(181)  
11-½"  
(292)  
11-½"  
(292)  
(406)  
2' 5-½"  
(749)  
(200)  
220  
"
"
1' 1-3/16  
(335)  
"
"
"
"
2' 4-¼"  
(718)  
2' 4-¼"  
(718)  
3' 1-¾"  
(959)  
3' 1-¾"  
(959)  
1' 0-3/8  
(314)  
"
2' 1-1/16  
(637)  
"
0' 8" 7-1/8  
"
(1219)  
4' 0"  
(2438)  
8' 0"  
(203) (181)  
222  
1' 1-3/16  
(335)  
2' 0-5/8  
(625)  
"
1' 0-3/8  
(314)  
"
"
"
2' 3-9/16  
(700)  
”
0' 8" 7-1/8  
"
(1219)  
5' 0"  
(2438)  
8' 0"  
(203) (181)  
1' 2" 6-¼"  
(356) (159)  
1' 2" 6-¼"  
(356) (159)  
225  
2' 7-3/8  
"
1' 5-9/16  
(446)  
1' 2-½" 3' 1-5/8  
"
1' 3-3/8  
(391)  
1' 3-3/8  
(391)  
2' 7-½" 2' 1-¾" 2' 9"  
(1524)  
5' 0"  
(2438)  
8' 0"  
(797)  
(368)  
(956)  
(800)  
3' 1"  
(940)  
(654)  
2' 1-¾" 2' 9"  
(654) (838) (1295) (508)  
(838) (1295) (508)  
230  
3' 0-7/8  
(937)  
"
1' 5-9/16  
(446)  
1' 2-½" 2' 2-5/8  
"
4' 3" 1' 8"  
(1524)  
(2438)  
(368)  
(676)  
Notes:  
1. To permit blower shaft replacement, the side opposite the controls should have clearance equal to the unit width.  
2. Minimum of 5’ for serviceability clearance.  
3. Supply duct connection (by others) to be “pants-legged” from unit discharge.  
24  
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Dim ension and  
Weights  
Vertical Arrangement — Single Blower  
100% Outside Air—Arrangement 4  
Table DW-7  
Model  
109  
A
B
C
D
E
F
G
H
J
K
L
10-3/8  
"
11-15/16  
"
1' 2-½"  
(368)  
1' ½"  
(318)  
1' 3-1/8  
(384)  
"
3' 0"  
3' 0" 6' 5"  
11' 3" 0' 3" 1' 10" 4' 4"  
(559) (1321)  
11' 3" 0' 3" 1' 10" 4' 4"  
(914) (914) (1956) (3429) (76) (559) (1321)  
3' 0" 3' 0" 6' 5" 11' 3" 0' 3" 1' 10" 4' 4"  
(914) (914) (1956) (3429) (76) (559) (1321)  
3' 0" 3' 0" 6' 5" 11' 3" 0' 3" 1' 10" 4' 4"  
(914) (914) (1956) (3429) (76) (559) (1321)  
(264)  
1' 1-9/16  
(344)  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16  
(405)  
(914) (914) (1956) (3429) (76)  
112  
115  
"
"
"
1' 1-9/16  
"
3' 0"  
3' 0" 6' 5"  
(344)  
1' 6-15/16  
(481)  
11-1/8  
"
1'  
"
3/8  
(283)  
7-7/8  
(200)  
(314)  
3/8  
118  
1' 10-1/16  
(560)  
"
"
1'  
"
(314)  
Notes:  
1. Factory furnished support stand shipped separately for field mounting by others.  
2. V-bank and inlet damper shown are optional components.  
3. If V-bank section is ordered, it will ship mounted to the support stand.  
4. If inlet damper is ordered, it will ship mounted in the support stand.  
5. Refer to page 35 for unit weights.  
MUA-PRC001-EN  
25  
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Dim ension and  
Weights  
Vertical Arrangement —Double Blower  
100% Outside Air—Arrangement 4  
Table DW-8  
Model  
215  
A
B
C
D
E
F
G
H
J
K
L
P
1' 4" 1' 6-15/16" 0' 7-7/8" 1' 0-3/8  
(406) (481) (200) (314) (914) (914) (1956) (3429) (76) (559) (2388) (565)  
1' 7" 1' 10-1/16"0' 7-7/8" 1' 0-3/8  
3' 0" 3' 0" 6' 5" 11' 3" 0' 3" 1' 10" 7' 10" 1' 4"  
(483) (560) (200) (314) (914) (914) (1956) (3429) (76) (559) (2388) (406)  
2' 0-7/8" 2' 1-1/16" 1' 0-3/8" 1‘ 1-3/16 4’ 0" 4' 0" 8' 0" 13' 10" 0' 4" 1' 10" 10' 10" 2' 5-5/8  
(632) (637) (314) (335) (1219) (1219) (2438) (4216) (102) (559) (3302) (752)  
2' 3-3/8" 2' 3-9/16" 1' 0-3/8" 1‘ 1-3/16 4’ 0" 4' 0" 8' 0" 13' 10" 0' 4" 1' 10" 10' 10" 2' 5-5/8  
(695) (700) (314) (335) (1219) (1219) (2438) (4216) (102) (559) (3302) (752)  
2' 7-3/8" 2' 7-½" 1' 3-3/8" 1‘ 5-9/16 5’ 0" 4' 0" 8' 0" 14' 4" 0' 4" 2' 4" 12' 10" 3' 1-5/8  
(797) (800) (391) (446) (1524) (1219) (2438) (4369) (102) (711) (3912) (956)  
3' 0-7/8 3' 1" 1' 3-3/8" 1‘ 5-9/16 5’ 0" 4' 0" 8' 0" 14' 4" 0' 4" 2' 4" 12' 10" 2' 2-5/8  
(937) (940) (391) (446) (1524) (1219) (2438) (4369) (102) (711) (3912) (676)  
"
3' 0" 3' 0" 6' 5" 11' 3" 0' 3" 1' 10" 7' 10" 1‘ 10-¼"  
218  
220  
"
”
"
"
"
"
222  
”
225  
”
230  
"
”
Notes:  
1. Supply duct connection (by others) to be “pants-legged” from unit discharge  
2. Factory furnished support stand shipped separately for field mounting by others.  
3. V-bank and inlet damper shown are optional components.  
4. If V-bank section is ordered, it will ship mounted to the support stand.  
5. If inlet damper is ordered, it will ship mounted in the support stand.  
6. Refer to page 35 for unit weights.  
26  
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Dim ension and  
Weights  
Vertical Arrangement — Single Blower  
Return Air Downstream of Burner—Arrangement 4  
Table DW-9  
Model  
109  
A
B
C
D
E
F
G
H
J
K
L
M
N
P
10-3/8  
"
11-15/16  
"
1' 2-½"  
(368)  
1' ½"  
(318)  
1' 3-1/8  
(384)  
"
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
6' 5"  
11' 3" 0' 3"  
(3429) (76)  
11' 3" 0' 3"  
(3429) (76)  
11' 3" 0' 3"  
(3429) (76)  
11' 3" 0' 3"  
(3429) (76)  
1' 10"  
4' 4"  
1' 2-¼"  
(362)  
1' 7"  
(483)  
1' 7"  
(483)  
1' 7"  
(483)  
1' 7"  
(483)  
2' 3-¾"  
(705)  
(264)  
1' 1-9/ "  
(3441)6  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16"  
(405)  
(1956)  
6' 5"  
(559) (1321)  
112  
115  
1' 1-9/16  
"
1' 10"  
(559) (1321)  
1' 10" 4' 4"  
(559) (1321)  
1' 10" 4' 4"  
(559) (1321)  
4' 4"  
1' 2-¼"  
(362)  
2' 3-¾"  
(705)  
(344)  
(1956)  
6' 5"  
1' 6-15/16  
(481)  
"
11-1/8  
"
1'  
"
1' 2-¼"  
(362)  
2' 3-¾"  
(705)  
3/8  
(283)  
7-7/8  
(200)  
(314)  
(1956)  
6' 5"  
3/8  
118  
1' 10-1/16  
(560)  
"
"
1'  
"
1' 2-¼"  
(362)  
2' 3-¾"  
(705)  
(314)  
(1956)  
Notes:  
1. Factory furnished support stand shipped separately for field mounting by others.  
2. V-bank and inlet damper shown are optional components.  
3. If V-bank section is ordered, it will ship mounted to the support stand.  
4. If inlet damper is ordered, it will ship mounted in the support stand.  
5. Refer to page 35 for unit weights.  
MUA-PRC001-EN  
27  
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Dim ension and  
Weights  
Vertical Arrangement — Double Blower  
Return Air Downstream of Burner—Arrangement 4  
Table DW-10  
Model  
215  
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
1' 4"  
1' 6-15/16  
(481)  
"
7-7/8  
"
1' 0-3/8  
"
3' 0"  
(914)  
3' 0"  
(914)  
4' 0"  
3' 0"  
(914)  
3' 0"  
(914)  
4' 0"  
6' 5"  
11' 3"  
(3429)  
11' 3"  
(3429)  
0' 3"  
(76)  
0' 3"  
(76)  
1' 10"  
(559)  
1' 10"  
(559)  
1' 10"  
(559)  
1' 10"  
(559)  
2' 4"  
7' 10"  
(2388)  
7' 10"  
(2388)  
1' 2-¼"  
(362)  
1' 7"  
(483)  
1' 7"  
(483)  
1' 7"  
(483)  
1' 7"  
(483)  
5' 5-¾" 1' 10-¼"  
(406)  
1' 7"  
(200)  
(314)  
(1956)  
6' 5"  
(1670)  
5' 5-¾"  
(1670)  
(565)  
1' 4"  
3/8  
218  
220  
222  
225  
230  
1' 10-1/16  
(560)  
"
7-7/8  
"
1'  
"
1' 2-¼"  
(362)  
(483)  
2' 0-7/8  
(632)  
2' 3-3/8  
(695)  
(200)  
(314)  
(1956)  
8' 0"  
(406)  
2' 5-5/8  
(752)  
2' 5-5/8  
(752)  
"
"
2' 1-1/16  
(637)  
"
1' 0-3/8  
(314)  
"
1' 1-3/16  
(335)  
"
"
"
"
13' 10" 0' 4"  
(4216) (102)  
13' 10" 0' 4"  
(4216) (102)  
14' 4"  
(4369) (102)  
14' 4" 0' 4"  
(4369) (102)  
10' 10" 1' 2-¼"  
7' 3-3/8  
"
"
"
(1219) (1219)  
4' 0" 4' 0"  
(1219) (1219)  
5' 0" 4' 0"  
(1524) (1219)  
5' 0" 4' 0"  
(1524) (1219)  
(2438)  
8' 0"  
(3302)  
10' 10" 1' 2-¼"  
(3302) (362)  
(362)  
(2219)  
2' 3-9/16  
(700)  
"
1' 0-3/8  
(314)  
"
"
"
1' 1-3/16  
(335)  
7' 3-3/8  
(2219)  
"
(2438)  
8' 0"  
2' 7-3/8  
"
2' 7-½"  
(800)  
3' 1"  
1' 3-3/8  
(391)  
1' 3-3/8  
(391)  
1' 5-9/16  
(446)  
0' 4"  
12' 10" 1' 8-¼" 1' 0-5/16  
"
"
9' 3-3/8  
(2829)  
"
3' 1-5/8  
"
(797)  
3' 0-7/8  
(937)  
(2438)  
8' 0"  
(2438)  
(711)  
2' 4"  
(711)  
(3912)  
12' 10" 1' 8-¼" 1' 0-5/16  
(3912) (514) (313)  
(514)  
(313)  
(956)  
2' 2-5/8  
(676)  
"
1' 5-9/16  
(446)  
9' 3-3/8  
(2829)  
"
"
(940)  
Notes:  
1. Supply duct connection (by others) to be “pants-legged” from unit discharge.  
2. Factory furnished support stand shipped separately for field mounting by others.  
3. V-bank and inlet damper shown are optional components.  
4. If V-bank section is ordered, it will ship mounted to the support stand.  
5. If inlet damper is ordered, it will ship mounted in the support stand.  
6. Refer to page 35 for unit weights.  
28  
MUA-PRC001-EN  
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Dim ension and  
Weights  
Vertical Arrangement  
Single Blower with Mixing Box—Arrangement 4  
Table DW-11  
Model  
109  
A
B
C
D
E
F
G
H
J
K
L
M
N
10-3/8  
"
11-15/16  
"
1' 2-½"  
(368)  
1' ½"  
(318)  
1' 3-1/8  
(384)  
"
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
6' 5"  
13' 11"  
(4242)  
13' 11"  
(4242)  
13' 11"  
(4242)  
13' 11"  
(4242)  
0' 3"  
(76)  
0' 3"  
(76)  
0' 3"  
(76)  
0' 3"  
(76)  
4' 6"  
4' 4"  
1' 8-¼"  
(514)  
3' 6"  
(264)  
1' 1-9/16  
(344)  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16  
(405)  
(1956)  
6' 5"  
(1372)  
4' 6"  
(1321)  
4' 4"  
(1067)  
3' 6"  
112  
115  
"
"
"
1' 1-9/16  
"
1' 8-¼"  
(514)  
1' 8-¼"  
(514)  
1' 8-¼"  
(514)  
(344)  
(1956)  
6' 5"  
(1372)  
4' 6"  
(1321)  
4' 4"  
(1067)  
3' 6"  
1' 6-15/16  
(481)  
11-1/8  
"
1'  
"
3/8  
(283)  
7-7/8  
(200)  
(314)  
(1956)  
6' 5"  
(1372)  
4' 6"  
(1321)  
4' 4"  
(1067)  
3' 6"  
3/8  
118  
1' 10-1/16  
(560)  
"
"
1'  
"
(314)  
(1956)  
(1372)  
(1321)  
(1067)  
Notes:  
1. Factory furnished support stand shipped separately for field mounting by others.  
2. V-bank and inlet damper shown are optional components.  
3. If V-bank section is ordered, it will ship mounted to the support stand.  
4. If inlet damper is ordered, it will ship mounted in the support stand.  
5. Refer to page 35 for unit weights.  
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Dim ension and  
Weights  
Vertical Arrangement  
Double BlowerWith Mixing Box—Arrangement 4  
Table DW-12  
Model  
215  
A
B
C
D
E
F
G
H
J
K
L
M
N
P
3/8  
1' 4"  
1' 6-15/16  
(481)  
"
7-7/8  
"
1'  
"
3' 0"  
3' 0"  
6' 5"  
13' 11" 0' 3"  
(4242) (76)  
13' 11" 0' 3"  
(4242) (76)  
17' 0" 0' 4"  
4' 6"  
7' 10"  
1' 8-¼"  
(514)  
7' 0"  
1' 10-¼"  
(565)  
(406)  
1' 7"  
(200)  
(314)  
(914)  
3' 0"  
(914)  
4' 0"  
(1219)  
4' 0"  
(1219)  
5' 0"  
(914)  
3' 0"  
(914)  
4' 0"  
(1219)  
4' 0"  
(1219)  
4' 0"  
(1956)  
6' 5"  
(1372) (2388)  
4' 6"  
(1372) (2388)  
5' 0" 10' 10"  
(2134)  
7' 0"  
3/8  
218  
220  
1' 10-1/16  
(560)  
"
7-7/8  
"
1'  
"
7' 10"  
1' 8-¼"  
(514)  
1' 4"  
(406)  
(483)  
2' 0-7/8  
(632)  
2' 3-3/8  
(695)  
(200)  
(314)  
1' 1-3/16  
(335)  
(1956)  
8' 0"  
(2134)  
10' 0"  
(3048)  
10' 0"  
(3048)  
12' 0"  
(3658)  
12' 0"  
(3658)  
"
"
2' 1-1/16  
(637)  
"
1' 0-3/8  
(314)  
"
"
"
"
"
1' 8-¼"  
(514)  
2' 5-½"  
(749)  
(2438)  
8' 0"  
(5182) (102) (1524) (3302)  
222  
2' 3-9/16  
(700)  
"
1' 0-3/8  
(314)  
"
"
"
1' 1-3/16  
(335)  
17' 0" 0' 4"  
(5182) (102) (1524) (3302)  
17' 5" 0' 4" 5' 5" 12' 10"  
(5309) (102) (1651) (3912)  
17' 5" 0' 4" 5' 5" 12' 10"  
(5309) (102) (1651) (3912)  
5' 0" 10' 10"  
1' 8-¼"  
(514)  
2' 0-5/8  
(625)  
3' 1-5/8  
(957)  
2' 2-5/8  
(676)  
"
"
"
(2438)  
8' 0"  
225  
2' 7-3/8  
"
2' 7-½"  
(800)  
3' 1"  
1' 3-3/8  
(391)  
1' 3-3/8  
(391)  
1' 5-9/16  
(446)  
2' 2-¼"  
(667)  
(797)  
3' 0-7/8  
(937)  
(1524)  
5' 0"  
(1524)  
(1219)  
4' 0"  
(1219)  
(2438)  
8' 0"  
(2438)  
230  
"
1' 5-9/16  
(446)  
2' 2-¼"  
(667)  
(940)  
Notes:  
1. Supply duct connection (by others) to be “pants-legged” from unit discharge  
2. Factory furnished support stand shipped separately for field mounting by others.  
3. V-bank and inlet damper shown are optional components.  
4. If V-bank section is ordered, it will ship mounted to the support stand.  
5. If inlet damper is ordered, it will ship mounted in the support stand.  
6. Refer to page 35 for unit weights.  
30  
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Dim ension and  
Weights  
Accessories  
Table DW-13  
Model  
R/A/I.D.  
109-118  
215-218  
220-222  
225-230  
3' 6" x 1' 8-¼"  
(1067 x 514)  
7' x 1' 8-¼"  
(2134 x 514)  
10' x 1' 8-¼"  
(3048 x 514)  
12' x 2' 2-½"  
(3658 x 673)  
NOTE:ALL DIMENSIONS IN INCHES  
SUBJECTTO MANUFACTURING  
TOLERANCES.  
Table DW-14  
Model  
A
B
C
D
E
F
G
H
J
K
L
M
Filters [Qty] Size  
109-112  
3' 0"  
(914)  
3' 0"  
(914)  
3' 0"  
(914)  
4' 0"  
(1219)  
5' 0"  
(1524)  
3' 11-¼"  
(1200)  
3' 11-¼"  
(1200)  
7' 7-½"  
(2324)  
1' 5-7/16  
(443)  
"
1' 8-13/16  
(529)  
"
1' 10"  
(559)  
1' 10"  
(559)  
1' 10"  
(559)  
1' 10"  
(559)  
2' 4"  
5' 1-¾"  
(1568)  
5' 1-¾"  
(1568)  
5' 1-¾"  
(1568)  
5' 5-¾"  
(1670)  
2' 8-¼"  
(819)  
3' 7-1/8  
"
1' 9"  
(533)  
2' 0"  
(610)  
2' 0"  
(610)  
3' 9"  
(1143)  
3' 9"  
(1143)  
1' 11"  
(584)  
2' 2"  
4' 4"  
4' 6" [9] 15x20x2"  
(1372) ([9] 381x508x51)  
4' 6" [9] 15x20x2"  
(1095)  
(1321)  
4' 4"  
115-118  
215-218  
220-222  
225-230  
1' 10-7/8  
(581)  
"
"
2' 2-15/16  
(684)  
"
2' 8-¼"  
(819)  
2' 8-¼"  
(819)  
3' 8-¼"  
(1124)  
4' 8-¼"  
(1429)  
3' 7-1/8  
(1095)  
"
(660)  
2' 2"  
(660)  
2' 7"  
(787)  
3' 4-¾"  
(1035)  
(1321)  
7' 10"  
(2388)  
10' 10"  
(3302)  
12' 10"  
(3912)  
(1372) ([9] 381x508x51)  
4' 6" [18] 15x20x2"  
(1372)([18] 381x508x51)  
5' 0" [25] 20x20x2"  
(1524)([25] 508x508x51)  
5' 5" [36] 20x25x2"  
(1651)([36] 508x635x51)  
1' 10-7/8  
(581)  
5' 4-7/8  
(1648)  
"
7' 3-3/8  
(2219)  
8' 1-½"  
(2477)  
"
8' 5-5/8  
"
2' 7-¼"  
(794)  
3' 4-¾"  
(1035)  
7' 0-½"  
(2146)  
(2581)  
10' 1-3/8  
(3083)  
"
8' 9-3/8  
"
7' 2-1/8  
"
9' 9- "  
(2978)  
¼
(2677)  
(711)  
(2188)  
Note:  
*Permanent filters are constructed of aluminum mesh.  
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Dim ension and  
Weights  
Roof Curbs  
Table DW-15  
Model  
109  
A
B
C
D
E
10-3/8  
"
1' 0-3/8  
(314)  
10-13/16  
(275)  
"
11-15/16  
"
11-¾"  
(298)  
1' 10-13/16  
(579)  
"
(264)  
1' 1-9/16  
(344)  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16  
(405)  
112  
115  
118  
"
"
"
"
9-7/8  
"
1' 8-7/8  
(530)  
"
(251)  
8-3/8  
(213)  
5-1/8  
(130)  
9-5/8  
(244)  
9-5/8  
(244)  
"
1' 6-15/16  
(481)  
"
1' 7-3/8  
"
(492)  
"
1' 10-1/16  
(560)  
"
"
1' 7-3/8  
(492)  
"
Table DW-16  
Model  
215  
A
B
C
D
5-1/8  
(130)  
5-1/8  
(130)  
9-5/8  
(244)  
9-5/8  
E
F
G
H
J
K
1' 4"  
(406)  
1' 7"  
(483)  
9-5/8  
"
1' 6-15/16  
(481)  
"
"
1' 10-½"  
(572)  
1' 11-3/8  
(594)  
"
6' 3"  
(1905)  
6' 3"  
5' 11-½" 7' 8" 7' 4-½"  
(1816) (2337) (2248)  
5' 11-½" 7' 8" 7' 4-½"  
(1816) (2337) (2248)  
7' 6-½" 10' 8" 10' 4-½"  
(2299) (3251) (3162)  
7' 6-½" 10' 8" 10' 4-½"  
(2299) (3251) (3162)  
7' 6-½" 12' 8" 12' 4-½"  
(2299) (3861) (3772)  
7' 6-½" 12' 8" 12' 4-½"  
(2299) (3861) (3772)  
(244)  
218  
9-5/8  
"
1' 10-1/16  
(560)  
"
"
1' 4"  
(406)  
1' 11-3/8  
(594)  
2' 11-½" 7' 10"  
(902)  
2' 11-½" 7' 10"  
(902) (2388)  
2' 11-½" 7' 10"  
(902) (2388)  
2' 11-½" 7' 10"  
(902) (2388)  
"
(244)  
(1905)  
220 2' 0-7/8  
(632)  
"
10-7/16  
(265)  
"
2' 1-1/16  
(637)  
"
"
2' 5-½"  
(749)  
(2388)  
222 2' 3-3/8  
(695)  
"
10-7/16  
(265)  
"
2' 3-9/16  
(700)  
"
"
2' 0-5/8  
(625)  
"
(244)  
225 2' 7-3/8  
"
1' 2-13/16  
(376)  
"
"
2' 7-½"  
(800)  
3' 1"  
1' 0-5/8  
(321)  
"
3' 1-5/8  
"
(797)  
230 3' 0-7/8  
(937)  
(956)  
2' 2-5/8  
(676)  
"
1' 2-13/16  
(376)  
1' 0-5/8  
"
"
(940)  
(321)  
Notes:  
1. Curb to be shipped loose and assembled in the field.  
2. Curb must be square and level.  
3. Curb requires intermediate structural support and is not to be corner post mounted.  
4. Gaskets to be shipped with unit.  
5. Bolting accessories shipped with curb.  
6. Curb drawings shown are for units which have controls on the “standard” side.  
7. Available on horizontal units only.  
32  
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Dim ension and  
Weights  
Roof Curbs for Units with Return  
Air Opening Downstream of Burner  
Table DW-17  
Model  
109  
A
B
C
D
E
10-3/8  
"
1' 0-3/8  
(314)  
10-13/16  
(275)  
"
11-15/16  
"
11-¾"  
(298)  
1' 10-13/16  
(579)  
"
(264)  
1' 1-9/16  
(344)  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16  
(405)  
112  
115  
118  
"
"
"
"
9-7/8  
"
1' 8-7/8  
(530)  
"
(251)  
8-3/8  
(213)  
9-5/8  
(244)  
9-5/8  
(244)  
"
1' 6-15/16  
(481)  
"
1' 7-3/8  
"
(492)  
"
1' 10-1/16  
(560)  
"
5-1/8  
"
1' 7-3/8  
(492)  
"
(130)  
Table DW-18  
Model  
215  
A
B
C
D
E
F
G
H
J
K
L
M
W
1' 4"  
9-5/8  
"
1' 6-15/16  
(481)  
"
5-1/8  
"
1' 10-½" 1' 11-3/8  
"
"
6' 3"  
5' 11-½"  
(1816)  
5' 11-½"  
(1816)  
7' 6-½"  
(2299)  
7' 6-½"  
(2299)  
7' 6-½"  
(2299)  
7' 6-½"  
(2299)  
7' 8"  
7' 4-½"  
(2248)  
7' 4-½"  
(2248)  
5' 5-¾"  
(1670)  
5' 5-¾"  
(1670)  
1' 4-¼"  
(413)  
1' 2-¼"  
(362)  
(406)  
1' 7"  
(244)  
(130)  
(572)  
1' 4"  
(594)  
1' 11-3/8  
(594)  
2' 11-½"  
(902)  
(1905)  
6' 3"  
(2337)  
7' 8"  
(2337)  
218  
220  
9-5/8  
"
1' 10-1/16  
(560)  
"
5-1/8  
(130)  
9-5/8  
(244)  
9-5/8  
"
1' 4-¼"  
(413)  
1' 2-¼"  
(362)  
(483)  
2' 0-7/8  
(632)  
2' 3-3/8  
(695)  
(244)  
(406)  
2' 5-½"  
(749)  
(1905)  
7' 10"  
(2388)  
7' 10"  
(2388)  
7' 10"  
(2388)  
7' 10"  
(2388)  
"
"
10-7/16  
(265)  
"
2' 1-1/16  
(637)  
"
"
10' 8" 10' 4-½"  
7' 3-3/8  
"
1' 4-¼"  
(413)  
1' 2-¼"  
(362)  
(3251)  
10' 8" 10' 4-½"  
(3251) (3162)  
12' 8" 12' 4-½"  
(3861) (3772)  
12' 8" 12' 4-½"  
(3861) (3772)  
(3162)  
(2219)  
222  
10-7/16  
(265)  
"
2' 3-9/16  
(700)  
"
"
2' 0-5/8" 2' 11-½"  
7' 3-3/8  
(2219)  
"
1' 4-¼"  
(413)  
1' 2-¼"  
(362)  
(244)  
1' 0-5/8  
(321)  
(625)  
(902)  
2' 11-½"  
(902)  
2' 11-½"  
(902)  
225  
2' 7-3/8  
"
1' 2-13/16  
(376)  
"
2' 7-½"  
(800)  
3' 1"  
"
"
3' 1-5/8  
"
9' 3-3/8  
(2829)  
"
9-1/16  
"
1' 8-¼"  
(514)  
(797)  
3' 0-7/8  
(937)  
(956)  
2' 2-5/8  
(676)  
(230)  
9-1/16  
(230)  
230  
"
1' 2-13/16  
(376)  
"
1' 0-5/8  
(321)  
"
9' 3-3/8  
(2829)  
"
"
1' 8-¼"  
(514)  
(940)  
Notes:  
1. Curb to be shipped loose and assembled in the field.  
2. Curb must be square and level.  
3. Curb requires intermediate structural support and is not to be corner post mounted.  
4. Gaskets to be shipped with unit.  
5. Bolting accessories shipped with curb.  
6. Curb drawings shown are for units which have controls on the “standard” side.  
7. Available on horizontal units only.  
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Dim ension and  
Weights  
Roof Curbs for Units with Mixing Box  
Table DW-19  
Model  
109  
A
B
C
D
E
10-3/8  
"
1' 0-3/8  
(314)  
10-13/16  
(275)  
"
11-15/16  
"
11-¾"  
(298)  
1' 10-13/16  
(579)  
"
(264)  
1' 1-9/16  
(344)  
1' 4"  
(406)  
1' 7"  
(483)  
(303)  
1' 3-15/16  
(405)  
112  
115  
118  
"
"
"
"
9-7/8  
"
1' 8-7/8  
(530)  
"
(251)  
8-3/8  
(213)  
5-1/8  
(130)  
9-5/8  
(244)  
9-5/8  
(244)  
"
1' 6-15/16  
(481)  
"
1' 7-3/8  
"
(492)  
"
1' 10-1/16  
(560)  
"
"
1' 7-3/8  
(492)  
"
Table DW-20  
Model  
215  
A
B
C
D
E
F
G
H
J
K
L
M
½
1' 4" 9-5/8  
"
1' 6-15/16  
"
5-1/8  
"
1' 10- " 1' 11-3/8" 10' 9" 10' 5-½" 7' 8" 7' 4-½" 1' 8-¼" 7' 0"  
(406) (244) (481) (130) (572) (594) (3277) (3188) (2337) (2248) (514) (2134)  
218  
220  
1' 7" 9-5/8" 1' 10-1/16" 5-1/8  
(483) (244) (560) (130) (406) (594) (3277) (3188) (2337) (2248) (514) (2134)  
2' 0-7/8" 10-7/16" 2' 1-1/16 9-5/8  
2' 5-½" 2' 11-½" 12' 10" 12' 6-½" 10' 8" 10' 4-½" 1' 8-¼" 10' 0"  
(632) (265) (637) (244) (749) (902) (3912) (3823) (3251) (3162) (514) (3048)  
2' 3-3/8" 10-7/16" 2' 3-9/16 9-5/8 2' 0-5/8" 2' 11-½" 12' 10" 12' 6-½" 10' 8" 10' 4-½" 1' 8-¼" 10' 0"  
"
1' 4" 1' 11-3/8" 10' 9" 10' 5-½" 7' 8" 7' 4-½" 1' 8-¼" 7' 0"  
"
"
222  
"
"
(695) (265) (700) (244) (625) (902) (3912) (3823) (3251) (3162) (514) (3048)  
2' 7-3/8" 1' 2-13/16" 2' 7-½" 1' 0-5/8" 3' 1-5/8" 2' 11-½" 13' 4" 13'-½" 12' 8" 12' 4-½" 2' 2-½" 12' 0"  
(797) (376) (800) (321) (956) (902) (4064) (3950) (3861) (3772) (673) (3658)  
225  
230  
3' 0-7/8"1' 2-13/16  
"
3' 1" 1' 0-5/8" 2' 2-5/8" 2' 11-½" 13' 4" 13'-½" 12' 8" 12' 4-½" 2' 2-½" 12' 0"  
(937) (376) (940) (321) (676) (902) (4064) (3950) (3861) (3772) (673) (3658)  
Notes:  
1. Curb to be shipped loose and assembled in the field.  
2. Curb must be square and level.  
3. Curb requires intermediate structural support and is not to be corner post mounted.  
4. Gaskets to be shipped with unit.  
5. Bolting accessories shipped with curb.  
6. Curb drawings shown are for units which have controls on the “standard” side.  
7. Available on horizontal units only.  
34  
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Dim ension and  
Weights  
Approximate Weights  
Table W-1 — Outdoor Unit Weights in Pounds (Approximate)*  
Basic  
Horizontal  
Unit  
Basic  
Vertical  
Unit  
Unit  
Size  
109  
112  
Inlet  
Hood  
140  
140  
140  
140  
210  
210  
275  
275  
365  
365  
Inlet  
Damper  
60  
V-Bank  
Filter  
125  
Mixing  
Box  
320  
Discharge  
Damper  
45  
Discharge  
Louver  
70  
A
B
C
D
760  
1010  
215  
215  
215  
225  
342  
378  
625  
675  
824  
863  
215  
215  
215  
225  
342  
378  
625  
675  
824  
863  
185  
185  
185  
200  
274  
311  
555  
545  
732  
731  
145  
145  
145  
160  
222  
233  
475  
475  
610  
673  
760  
1010  
1010  
60  
125  
320  
45  
70  
115  
760  
60  
60  
125  
125  
320  
45  
70  
118  
820  
1060  
1650  
1770  
3270  
3360  
4250  
4390  
320  
45  
70  
215  
218  
220  
222  
225  
230  
Note:  
1180  
160  
160  
210  
210  
320  
320  
200  
200  
250  
586  
80  
150  
1300  
2280  
2370  
2990  
3130  
586  
80  
150  
730  
145  
215  
250  
730  
145  
215  
330  
1006  
1006  
190  
230  
330  
190  
230  
*Contact factory for shipping weight on models exceeding 50,000 CFM.  
Table W-2 — Roof Curb Weights in Pounds  
Unit Size  
218  
Description  
109  
112  
150  
150  
215  
115  
150  
150  
215  
118  
150  
150  
215  
215  
220  
222  
225  
300  
300  
375  
230  
300  
300  
375  
Roof Curb for Basic Frame—No Return Air  
150  
150  
215  
200  
200  
270  
200  
270  
270  
340  
270  
270  
340  
Roof Curb for Basic Frame—With Return Air Downstream of Burner  
Roof Curb for Basic Frame—With Mixing Box Option  
200  
270  
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Mechanical  
Specifications  
General  
Burner Section  
Controls  
The BASIC unit is factory-assembled,  
wired and test-fired. DEPENDING ON  
THE OPTIONS, UNIT MAY SHIP IN  
SECTIONS DUETO PHYSICAL SIZE  
OF EQUIPMENT. Although designed  
primarily for outdoor mounting, it can be  
mounted indoors. Units are mounted on  
steel rails with lifting lugs, which make  
them suitable for curb or slab mounting.  
Units are available for operation on  
either natural or LP (propane) gas.  
The burner section shall contain a  
Maxon NP burner constructed of rust-  
resistant cast iron bodies (which serve as  
the gas manifold) drilled to discharge the  
fuel between diverging #321 stainless  
steel mixing plates.The entire burner  
assembly is mounted directly in the air  
stream being heated.The fresh air  
stream passes through the mixing plates  
and mixes with the fuel as combustion  
air; thus, all available heat from the  
gaseous fuel is released directly into the  
air stream. Air velocities across the  
burner assemblies are established by the  
use of profile plates.  
Unit controls shall consist of a spark  
ignition system with a flame rod sensing  
the flame, a high temperature limit  
switch set at 185 F, a flame safeguard  
with alarm contacts, ignition  
transformer, air proving differential  
switch, timed freeze protection, and a  
series 14 or 44 modulating control  
system.  
The unit shall also contain a main fan  
starter and overloads, control circuit  
fuses, and vents for outdoor units.  
Casing  
Basic unit casings are fabricated  
of die-formed galvanized steel.  
Unit sizes 109-220 shall be 18-gauge.  
Unit sizes 225-230 shall be 18-gauge,  
except exterior walls which are  
16-gauge.  
Gas Train Approvals  
The standard gas train consists of a main  
manual gas shutoff valve, a motorized  
electric main gas valve,  
the Maxitrol modulating gas valve,  
a manual pilot gas shutoff valve, a  
manual pilot gas pressure regulator, a  
pilot gas valve, an orificed needle valve,  
and an auxiliary gas valve.  
The manifold is located outside of the  
airstream and shielded from  
atmospheric conditions by means of a  
protective compartment with hinged  
access. An observation port shall be  
located to provide view of the pilot and  
main flame.  
Access doors are hinge-mounted with  
industrial-type hardware for easy access  
to service compartments.  
All casings shall be airtight and  
weatherproof. Complete access shall be  
provided to all components through  
gasketed access doors or panels.This  
includes the motor, blower, burner,  
electrical components, and manifold  
sections.  
The Factory Mutual (FM) gas train  
consists of a manual main gas shutoff  
valve, a motorized electric main gas  
valve, the Maxitrol modulating gas valve,  
a manual pilot gas shutoff valve, a  
manual pilot gas pressure regulator, a  
pilot gas valve, an orificed needle valve,  
a high/low gas pressure switch, a  
Units shall be supplied with a wide-  
range burner with a modulating  
turndown ratio of 25 to 1. Adjustable  
profile plates shall be provided and sized  
to maintain the required velocity across  
the line burner.The operation of the  
burner shall be programmed through  
the flame safeguard with timed prepurge  
and flame sensing.  
Fans  
manual auxiliary gas shutoff valve, and  
an auxiliary gas valve. (Optional)  
Supply fans shall be double width,  
double inlet centrifugal type with FC fan  
wheels. Fans are tested in accordance  
with AMCA 210.The fan or fans shall be  
mounted on a heavy-duty polished steel  
shaft designed for a maximum operating  
speed not to exceed 75 percent of its first  
critical speed. Bearings are to be heavy-  
duty, industrial prelubricated type.  
Control Enclosure  
The Industrial Risk Insurers (IRI) gas train  
consists of a manual main gas shutoff  
valve, a motorized electric main gas  
valve, the Maxitrol modulating gas valve,  
a manual pilot gas shutoff valve, a  
manual pilot gas pressure regulator, a  
pilot gas valve, an orificed needle valve,  
a high/low gas pressure switch, a  
Units shall be provided with a control  
compartment. All controls mounted  
within this compartment are to be wired  
to a numbered terminal strip.  
All wiring is to be color coded and in  
accordance with NEC. A circuit diagram  
of the approved electrical drawing shall  
be provided with the unit. All electrical  
components shall bear the UL label.  
Bearing life is 100,000 hours.  
manual auxiliary gas shutoff valve, a  
normally open vent valve, and an  
auxiliary gas valve. (Optional)  
Blowers are driven by a V-belt package  
sized with a capacity of 25 percent  
greater than the motor horsepower.  
Multiple belt applications will be  
matched sets. Drives are adjustable  
pitched diameter type up through 7½ hp,  
fixed on motors over 7½ hp.  
36  
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Options  
Motorized Return Air Damper  
Purpose  
To provide a way for recirculating return  
air.  
Operation  
A two position switch controls the return  
air damper.  
When the two position switch is in the  
“RA” position, the RA damper opens.  
Fifty percent of supply air is RA,  
50 percent of supply air is OA.  
RA damper can be set to allow from  
0 percent to 50 percent return air by field  
adjustment of the linkage rods.The gas  
valve opening is restricted when the RA  
damper is open.  
Code requires that outside ventilation air  
be provided to the space in the amount  
of 4 cfm per 1 MBh of burner rated  
input.  
When the two position switch is in the  
“OA” position, the RA damper is closed,  
and 100 percent of supply air  
is OA.  
Note:This option can be used with  
either the Motorized Inlet Damper  
option or the Motorized Outlet Damper  
option.  
All units are provided with a means that  
will allow the customer to interlock OA  
fans when the amount of OA provided  
by the unit is not sufficient to meet the  
4 cfm per 1 MBh requirement.  
Option Includes:  
Note:This option cannot be used with a  
two speed fan motor.  
• Return air damper  
•Two position damper motor  
• Damper switch  
Motorized 75/25 Damper  
Purpose  
To provide a way for recirculating return  
air and letting building pressure control  
the amount of air which is recirculated.  
Operation  
If building pressure is less than desired,  
the RA damper modulates to a more  
closed position and the interlocked  
burner profile damper modulates to a  
more open position. More OA is brought  
into building.  
If building pressure is greater than  
desired, the RA damper modulates to a  
more open position and the interlocked  
burner profile damper modulates to a  
more closed position. Less OA is brought  
into building.  
Code requires that outside ventilation air  
be provided to the space in the amount  
of 4 cfm per 1 MBh of burner rated input.  
Note:This option can be used with  
either the Motorized Inlet Damper  
option or the Motorized Outlet Damper  
option.  
All units are provided with a means that  
will allow the customer to interlock OA  
fans when the amount of OA provided  
by the unit is not sufficient to meet the 4  
cfm per 1 MBh requirement.  
Option Includes:  
• Return air damper  
• Burner profile damper  
• Linkage  
• Modulating damper motor(s)  
At no time will the unit provide less than  
25 percent OA to the building.  
In general terms, the minimum OA is  
25 percent; however, there are  
cases where it can be as high as  
40-50 percent, depending upon unit size,  
burner size, gas train type and  
gas pressure.  
Note:This option cannot be used with a  
two speed fan motor.  
• Photohelic differential pressure gauge  
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Options  
Mixing Box —  
Temperature Control  
Purpose  
To provide a way for recirculating return  
air and letting mixed air temperature  
determine the amount of OA/RA.  
Operation  
A temperature sensor located after the V-  
bank filter modulates the OA and RA  
dampers to maintain a set temperature.  
If temperature at sensor is cooler than  
setting, OA damper modulates to a more  
closed position, and RA damper  
modulates to a more open position.  
If temperature at sensor is warmer than  
setting, OA damper modulates to a more  
open position, and RA damper  
The minimum OA damper position is  
factory set with a potentiometer.The  
minimum OA damper position is set at 4  
cfm per 1 MBh of burner rated input, or  
25% supply air, whichever is larger.  
Option Includes:  
• Mixing box with V-bank filter and  
permanent filters  
• Dampers  
• Modulating damper motor(s)  
•Temperature sensor  
modulates to a more closed position.  
The desired temperature at the  
temperature sensor is set at the control  
cabinet at the unit.  
Mixing Box —  
Manual Control  
Purpose  
To provide a way for recirculating return  
air and using manual control to  
determine the amount of OA/RA.  
Operation  
A manual potentiometer located at the  
remote control station determines the  
OA/RA setting.The minimum OA damper  
position is factory set with a  
potentiometer.The minimum OA  
damper opening is set at 4 cfm per  
1 MBh of burner rated input, or 25%  
supply air, whichever is larger.  
Option Includes:  
• Mixing box with V-bank filter and  
permanent filters  
• Dampers  
• Modulating damper motor(s)  
• Manual potentiometer  
Note: Remote control station not  
included.  
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Options  
Mixing Box —  
Building Pressure Control  
Purpose  
To provide a way for recirculating return  
air and letting building pressure control  
the amount of air which is recirculated.  
Operation  
If building pressure is less than desired,  
the RA damper modulates to a more  
closed position and the OA damper  
modulates to a more open position.  
More OA is brought into building.  
If building pressure is greater than  
desired, the RA damper modulates to a  
more open position and the OA damper  
modulates to a more closed position.  
Less OA is brought into building.  
The minimum OA damper position is  
factory set with a potentiometer.The  
minimum OA damper position is set at 4  
cfm per 1 MBh of burner rated input, or  
25% supply air, whichever is larger.  
Option Includes:  
• Mixing box with V-bank filter and  
permanent filters  
• Dampers  
The desired pressure differential is set at  
the photohelic.  
• Modulating damper motor(s)  
• Photohelic differential pressure gauge  
Motorized Inlet Damper  
Purpose  
To provide a shut-off damper.  
Operation:  
When the fan switch is on, the inlet  
damper begins to open. As the inlet  
damper approaches the full open  
position, a built-in end switch located  
inside the damper motor closes.The  
closed end switch starts the fan motor.  
When the fan switch is turned to the  
“off” position, or if there is a power  
failure, the inlet damper closes.  
Option Includes:  
• Damper  
•Two position damper motors with built-  
in end switch and spring return  
• Linkage  
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Options  
Option Includes:  
• Damper  
•Two position damper motor with built-  
in end switch and spring return  
• Linkage  
Motorized Outlet Damper  
Purpose  
To provide a shut-off damper.  
Operation  
When the fan switch is on, the outlet  
damper begins to open. As the outlet  
damper approaches the full open  
position, a built-in end switch located  
inside the damper motor closes.The  
closed end switch starts the fan motor.  
When the fan switch is turned to the  
“off” position, or if there is a power  
failure, the outlet damper closes.  
CGA Approval Requirements  
A DFOA unit with no mixing box,  
motorized RA damper, or motorized 75/  
25 damper can bear the CGA label if:  
1
ETL Labeling Requirements  
A DFOA unit with a mixing box,  
motorized RA damper, or motorized  
75/25 damper can bear the ETL label if:  
ETL Labeling Requirements  
A DFOA unit with no mixing box,  
motorized RA damper, or motorized  
75/25 damper can bear the ETL label if:  
The unit SCFM is less than the Maximum  
SCFM given below.  
2
The unit input is less than the Maximum  
1
Input BTUH given below.  
1
The unit SCFM is less than the  
3
The unit SCFM is less than the  
Maximum SCFM given below.  
The static pressure is in the range given  
Maximum SCFM given below.  
2
below.  
2
The unit input is less than the Maximum  
4
The unit input is less than the Maximum  
BTUH rating given below.  
Unit discharge temperature is 75 F  
BTUH rating given below.  
3
maximum.  
3
The unit temperature rise is less than the  
5
The unit temperature rise is less than the  
Maximum Temperature Rise given  
below.  
4
The ambient temperature is minus 40 F  
Maximum Temperature Rise given  
below.  
4
or greater.  
6
The fuel is natural gas.  
The unit has a maximum temperature  
The fuel is natural gas.  
5
rise of 90 F for single blower units and  
100 F for double blower units.  
7
The unit minimum input rating is 1/25 of  
the Max. Input BTUH given below.  
5
The motor is a single speed motor.  
6
The motor is a single speed motor.  
6
Unit components are standard (there are  
exceptions to this).  
Unit components are standard (there are  
exceptions to this).  
8
The fuel is natural gas.  
Model  
Max.  
SCFM  
3,000  
Max.  
Max.Temp.  
Rise  
Model  
Max.  
SCFM  
3,000  
Max.  
Max.Temp.  
Rise  
No.  
BTUH  
No.  
BTUH  
9
DFOA 109  
DFOA 112  
DFOA 115  
DFOA 118  
DFOA 215  
DFOA 218  
DFOA 220  
DFOA 222  
DFOA 225  
DFOA 230  
424,565  
120 F  
120 F  
120 F  
120 F  
120 F  
120 F  
120 F  
120 F  
120 F  
120 F  
DFOA 109  
DFOA 112  
DFOA 115  
DFOA 118  
DFOA 215  
DFOA 218  
DFOA 220  
DFOA 222  
DFOA 225  
DFOA 230  
291,262  
100 F  
100 F  
100 F  
100 F  
100 F  
100 F  
100 F  
100 F  
100 F  
100 F  
The motor is a single speed motor.  
4,250  
601,290  
4,250  
412,621  
6,000  
8,500  
848,880  
10  
6,000  
8,500  
582,524  
1,202,580  
1,697,760  
2,546,640  
3,678,480  
4,385,880  
6,508,080  
9,054,720  
680,000  
1,349,831  
1,800,000  
2,924,634  
3,100,000  
5,174,353  
6,400,000  
Unit components are standard (there are  
exceptions to this).  
12,000  
18,000  
26,000  
31,000  
46,000  
64,000  
12,000  
18,000  
26,000  
31,000  
46,000  
64,000  
Model  
Static  
(in W.C.)  
0-4.0  
Max.  
SCFM  
3,000  
Max. Input.  
(BTUH)  
No.  
DFOA 109  
DFOA 112  
DFOA 115  
DFOA 118  
DFOA 215  
DFOA 218  
DFOA 220  
DFOA 222  
DFOA 225  
DFOA 230  
325,500  
0-4.0  
0-4.0  
4,250  
461,125  
6,000  
8,500  
851,000  
0-4.0  
0-4.0  
0-4.0  
0-4.0  
0-4.0  
0-4.0  
0-3.5  
922,250  
12,000  
17,000  
26,000  
31,000  
46,000  
64,000  
1,302,000  
1,844,500  
2,821,000  
3,363,500  
4,991,000  
6,944,000  
These requirem ents were current when this catalog was  
printed.  
Please contact Technical Support for the m ost current  
data available.  
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Options  
Exhaust Interlock  
Example: Same as example above, only  
at 5:00 PM the NSB thermostat would  
turn the unit on and off. If the  
temperature in the space fell below the  
setting of the NSB thermostat, the unit  
would come “on.” If the temperature  
rose above the setting, the unit would go  
“off.”  
Optional Gas Controls  
Series 14 — Constant Discharge  
Temperature  
The exhaust interlock is a pair of contacts  
on the unit that will close when the unit  
is “on.”The customer can wire the  
exhaust fan to the contacts so that when  
the heating unit is “on,” the exhaust fan  
will also be “on.” Note the heating unit  
turns on the exhaust fan.  
The constant discharge temperature, gas  
modulating control system consists of  
the Maxitrol electronic gas modulating  
system (55 to 90 F range), which includes  
a discharge air sensor located in the  
blower discharge, a modulator/regulator  
valve mounted in the gas piping  
manifold, an amplifier installed in the  
electrical control panel, a 115 to 24 volt  
transformer, and a remote temperature  
selector.  
The auxiliary contacts on the fan motor  
starter are the contacts which are used  
as the exhaust interlock.The auxiliary  
contacts are wired to the numbered  
terminal strip.The customer can wire the  
indicated terminals into the control  
circuit of the exhaust fan.  
Inlet On-Off Duct Stat  
Automatically turns burner off when inlet  
air temperature equals setting of control.  
Works as a lockout for the burner.  
Example: If we want the burner to be  
“off” if the entering air temperature is  
65 degrees, the inlet on-off duct stat  
would be set at 65 degrees.  
Series 44 — Space Temperature Control  
Note: If the customer wants the exhaust  
fan to turn the heating unit “on,” he/she  
has to provide a pair of contacts that will  
close when the exhaust fan is “on.”  
The space temperature control, gas  
modulating control system consists of  
the Maxitrol electronic gas modulating  
system, which includes a Series 44  
discharge air sensor (55 to 90 F range)  
mounted in the blower discharge, a  
modulator regulator valve mounted in  
the gas piping manifold, an amplifier  
installed in the electric control panel, a  
115 to 24 volt transformer, and a  
Without the inlet on-off duct stat, if the  
fan switch and heat switch are both “on,”  
no matter how warm the incoming air,  
the burner will go as low as low fire, but  
will not go “off.”  
Interlocking Relay  
The interlocking relay is two pair of  
contacts, one normally open and the  
other normally closed. The contacts  
switch positions when the unit is “on.”  
The contacts are wired to the numbered  
terminal strip. The customer can wire a  
wide range of devices to the interlocking  
relay by wiring to the indicated  
terminals.  
UV Flame Sensor (UV Mini-Peeper)  
Flame sensor checks to make sure the  
pilot flame has ignited before gas is sent  
to the main burner. Operates by sensing  
the light of the pilot flame.  
Selectrastat mounted in the area where  
the temperature is to be sensed.  
If the flame sensor does not sense the  
pilot flame, the unit shuts down (fan and  
burner go off) and the flame failure light  
on the optional remote panel  
goes on.  
Seven DayTimeclock/  
Night SetbackThermostat  
The seven day timeclock is used  
primarily for either one of the following:  
1
The unit has to be reset by pushing the  
reset button on the burner relay.  
Differences between UV Flame Sensor  
and Flame Rod:  
Start and stop the unit at preset times  
Example: A building is occupied at  
8:00 AM. At 4:30 PM, people leave the  
building.The timeclock could be set to  
turn the unit on at 7:30 AM and off at  
5:00 PM.  
Both are used for the same purpose —  
to check if the pilot flame is on. The  
flame rod is “standard.” The UV sensor  
needs to be ordered as an option.  
If condensation forms on the flame rod  
while the unit is off, it may give a false  
signal and prevent the unit from coming  
on. The wet flame rod does not sense  
the pilot flame and shuts the unit down.  
This nuisance tripping can be avoided  
with the UV flame sensor.  
2
The timeclock can be used with an on-off  
night setback thermostat (NSB  
thermostat).The timeclock and NSB  
thermostat would be wired so that  
during the night, the NSB thermostat  
would turn the unit on and off.  
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Options  
Two-Speed/One Winding Motors  
60 Hz/1800/900 Rpm  
Mixing Box — Building Pressure Control  
This option provides a way for  
Factory Installed Options  
Motors — General  
All motors are provided as standard,  
with a starter for external overload  
protection, a control transformer, and a  
fusible disconnect switch.  
recirculating return air and allows  
building pressure to control the amount  
of air which is recirculated.This option  
includes a mixing box with filter section,  
dampers, damper actuator(s), and  
damper controls (including a photohelic  
differential pressure gauge).  
Three-Phase Only  
Optional 208 and 230V motors available  
on 1 to 20 hp models. Optional 460V  
motors are available on 1 to 50 hp  
models. All motors have rigid base  
construction and ball bearings. Class B  
insulation is on all motors.  
Open Drip-Proof Motor  
60 Hz/1800 Rpm  
Single Phase  
Mixing Box — Manual Control  
This option provides a way for  
recirculating return air and using manual  
control to determine the amount of OA/  
RA.This option includes a mixing box  
with filter section, dampers, damper  
actuator(s), and a manual  
Two-Speed/Two Winding Motors  
60 Hz/1800/1200 Rpm  
Optional 115V motors are available in ¾  
to 3 hp models. Optional 208V motors  
are available in ¾ to 7½ hp models.  
Optional 230V motors are available in ¾  
to 10 hp models. All motors have rigid  
base construction and ball bearings.  
Class A insulation is on all motors up to  
and including 3 hp models. Class B  
insulation is on 5 hp and above models.  
Three-Phase Only  
Optional 208 and 230V motors available  
on 1 to 20 hp models. Optional 460V  
motors are available on 1 to 50 hp  
models. All motors have rigid base  
construction and ball bearings. Class B  
insulation is on all motors.  
potentiometer.  
Inlet/Outlet Dampers  
Motorized Inlet Damper  
Three-Phase  
Additional Options*  
Inlet Hood and Birdscreen  
Hood constructed of 18-gauge  
galvanized steel. Birdscreen is 18-gauge  
galvanized steel with one-inch square  
openings.  
This option provides a shutoff damper.  
This option includes an outside air  
damper, damper motor with built-in end  
switch, and linkage. It is not available  
with a mixing box.  
Optional 208, 230, 460V available in 1 to  
60 hp models. All models have rigid  
base construction and ball bearings.  
Class B insulation is on all three-phase  
motors.  
Motorized Outlet Damper  
Energy Efficient ODP  
60 Hz/1800 Rpm  
V-Bank Filter Section  
This option provides a shutoff damper.  
This option includes a discharge damper,  
two-position damper motor with a built-  
in end switch, and linkage.  
Not required when a mixing box is  
specified. Constructed of 18-gauge  
galvanized steel.  
Three-Phase Only  
Optional 208V motors are available in 1  
to 30 hp models. 230 and 460V motors  
are available in 1 to 60 hp models. All  
motors have rigid base construction and  
ball bearings. Class B insulation is on all  
motors.  
Dampers and Mixing Box  
*Based on unit design, some options  
can ship factory installed or field  
installed. Contact the factory for  
verification.  
Motorized Return Air Damper  
This option provides a way to recirculate  
air, with the return air opening  
downstream of the burner.This option  
includes return air damper, a two-  
position damper motor, linkage and  
damper switch. It is not available with  
two-speed motors.  
Totally Enclosed Motor  
60 Hz/1800 Rpm  
Three-Phase Only  
Optional 208V motors are available in ¾  
to 20 hp models. Optional 230 and 460V  
motors are available in ¾ to 60 hp  
models. All motors have rigid base  
construction and ball bearings.  
Motorized 75/25 Damper  
This option provides a way for  
recirculating return air and allows  
building pressure to control the amount  
of air that is recirculated.This option  
includes a return air damper, burner  
profile plate damper, damper linkage,  
and modulating pressure controller. It is  
not available with two-speed motors.  
Energy Efficient TEFC  
60 Hz/1800 Rpm  
Three-Phase Only  
Optional 208V motors are available in 1  
to 30 hp models. 230 and 460V motors  
are available in 1 to 60 hp models. All  
motors have rigid base construction and  
ball bearings. Class B insulation is on all  
motors.  
Mixing Box —Temperature Control  
This option provides a way for  
recirculating return air and allows mixed  
air temperature to determine the amount  
of OA/RA.This option includes mixing  
box with filter section, dampers, damper  
actuator(s), and damper controls.  
42  
MUA-PRC001-EN  
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Accessories  
Circuit Analyzer  
Additional Factory Installed  
Options  
High Gas Pressure Regulator  
1-5 Psig  
Units 825 MBh and less require an  
additional gas pressure regulator if inlet  
pressure exceeds 1 psig. Inlet pressure at  
the job must be specified.  
Field Installed Accessories  
Vibration Feet  
Rubber-in-shear vibration isolators  
cannot be ordered with a roof curb —  
they ship unmounted.  
Provides indicator lights for maintenance  
troubleshooting. If the unit is not  
functioning properly, the service person  
will want to know which circuits are open  
and which are closed.The circuit analyzer  
will tell the service person, at a glance,  
the status (open or closed) of the  
different circuits. If an indicating light is  
lit, the circuit is in its correct operating  
mode. It mounts on the control panel of  
the unit.The number of lights and  
functions depends on the control options  
of the unit.  
Vibration Feet — Basic Frame  
Vibration Feet — Filter Section  
Vibration Feet — Mixing Box  
5-10 Psig  
An additional regulator is furnished. Inlet  
pressure at the job must be specified.  
Seven-DayTime Clock  
This option includes a Paragon seven-  
day general purpose time control with a  
four-pole switch.  
Insulation  
One-inch, 1½ lb. fiberglass insulation pin  
spotted to casing.  
UV Flame Sensor  
100 DBL Alarm Horn and Silencing  
Switch  
The flame sensor checks to make sure  
the pilot flame has ignited before gas is  
sent to the main burner. It operates by  
sensing the light of the pilot flame.  
Insulation on Basic Frame  
Insulation on Filter Section  
The alarm horn and silencing switch are  
field-wired so that if the pilot flame does  
not ignite, the alarm sounds.To silence  
the alarm, the push button silencing  
switch is pushed.  
Internal Blower/Motor Isolation  
This option includes a steel frame for  
blower(s) and a fan motor with spring  
type vibration isolators. It is not available  
on vertical units.  
Clogged Filter Switch  
This option includes a pressure sensing  
switch which senses the pressure drop  
across the filters. When the pressure  
drop reaches the setpoint, the switch  
trips and lights the clogged filter light.  
It is not required when City of Chicago  
controls are ordered.  
Remote Control Station  
Option includes fan and heat switches,  
burner on light, alarm light, and Maxitrol  
Selector or Selectrastat.  
Extended Grease Lines  
This option allows lubrication of fan  
bearings from the control side of the unit.  
On-Off Night SetbackThermostat  
This option will shut unit off when space  
temperature is above setpoint.This is a  
115V thermostat with a temperature  
range of 50 to 80 F. Option is normally  
used together with the seven-day  
timeclock option.  
Controls Opposite from Standard  
Exhaust Fan Interlock  
Inlet On-Off Duct Stat  
This option includes a pilot duty rated  
normally open contact on the main  
supply fan motor starter that will close  
simultaneously with the starter (10 amp  
contacts).  
This automatically turns the burner off  
when inlet air temperature equals  
desired discharge air temperature. It  
works as a lockout for the burner.  
Temperature range of 25 to 225 SPDT.  
High Gas Pressure Regulator —  
Over 10 Psig  
Specify inlet pressure at the jobsite.This  
Interlocking Relay  
115V Duplex Receptacle  
This option is energized by an auxiliary  
contact on the supply fan motor starter  
that can be used for additional  
equipment that may need to run when  
the supply fan is running (12 amp  
contacts).  
This option includes a transformer and  
disconnect switch for the receptacle.  
Components are mounted in the gas  
piping manifold.  
is required for selection of the regulator.  
Roof Curbs  
Roof curbs are fabricated of 12-gauge  
galvanized steel. Curb gasket is provided.  
The 12-inch high roof curbs ship  
disassembled.  
City of Chicago Controls  
This option includes an access door  
interlock switch, an alarm horn with  
silence switch, low temperature limit,  
and a clogged filter switch.  
Roof Curb For Basic Frame —  
No return air  
Roof Curb For Basic Frame —  
With return air downstream of the  
burner  
Roof Curb For Basic Frame —  
With mixing box option  
MUA-PRC001-EN  
43  
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Literature Order Number  
File Number  
MUA-PRC001-EN  
PL-UN-MUA-DFOA-PRC001-9-00  
MUA-D-2 12/97  
Supersedes  
The Trane Com pany  
An Am erican Standard Com pany  
w w w .trane.com  
Stocking Location  
Inland - LaCrosse  
For more information contact your local  
district office, or e-mail us at  
comfo[email protected]  
Since The Trane Company has a policy of continuous product and product data improvement, it reserves the  
right to change design and specifications without notice.  
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