Trane Dfoa Make Up Air Units Direct Fired Outdoor PDF Catalog MUA PRC001 EN User Manual 3b8ba5b8 2c9e 49a9 9713 8c30e7327567

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Make-Up
Air Units
Direct-Fired Outdoor
Model DFOA

September 2000

MUA-PRC001-EN

Introduction

Why Use Trane Make-Up Air Units?
To help relieve negative pressure inside
commercial and industrial facilities, such
as factories, garages, packing plants,
kitchens, bowling alleys, and welding
and foundry areas.Trane’s make-up air
units offer a wide range of cfm, from
1,600 to 64,000, and gas-fired burners
with capacities from 131,000 Btuh to
7,748,000 Btuh.These ranges offer
excellent variety when selecting a unit
that will fill both the owner’s needs and
those of the specifying engineer.These
units are flexible in that they can be
located indoors or outdoors, and either
curb or grade mounted.

©American Standard Inc. 2000

All standard units include the necessary
controls for operation, such as a flame
safeguard, an air proving differential
switch, a high temperature limit switch,
and an ignition transformer. Component
parts are of the highest quality. Each unit
has overlapping, fail-safe protection
devices to handle failures should they
occur. Each unit is factory tested before it
ships, and is designed to provide years
of reliable, low maintenance operation.
Units are built with UL approved
components, where applicable. Special
gas controls can be furnished to comply
with FM or IRI requirements.

MUA-PRC001-EN

Contents

Introduction
Features and Benefits

2
4

Unit Configurations

6
7

Application Considerations
Model Number Description

Controls

8
9
11
16

Electric Power

18

Dimension and Weights

19

Mechanical Specifications

36
37
43

Performance Data
Gas Piping

Options
Accessories

MUA-PRC001-EN

3

Features and
Benefits

À Supply air intake view showing inlet hood
and birdscreen

 Optional inlet damper wtih V-bank filter

Á Gas burner section

à Factory assembled gas manifold
compartment

Ä Access compartment to control panel and
fan motor.
Note: Fan motor panel has been removed for photograph.

4

MUA-PRC001-EN

Features and
Benefits

Basic Unit

Gas-Fired Unit

Feature:
Casing with galvanized finish
Benefit:
Rust problem is greatly reduced

Feature:
Many standard, natural gas burning
units bear the ETL label. Contact
factory for verification.
Benefit:
Meets certain insurance requirements

Feature:
Watertight construction
Benefit:
Designed for indoor or outdoor
mounting
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:
Adjustable motor mount
Benefit:
Belt tension can be field adjusted for
maximum belt life and for motor speed
adjustment
Feature:
Basic unit is factory assembled and
wired
Benefit:
Reduces field installation cost

Feature:
Optional temperature control systems
available
Benefit:
Select system to satisfy application
Feature:
Optional dual fuel gas manifold
Benefit:
Standby flexibility in case natural gas
supply is interrupted
Feature:
Optional construction provides return
air cycle
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:
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

MUA-PRC001-EN

5

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

MUA-PRC001-EN

Application
Considerations

Outdoor Units
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 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:
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.

MUA-PRC001-EN

What Fuel to Use?
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.

Note: Selected horizontal and vertical
units are available with special coil
options (DX, chilled water, steam or
electric).

7

Model
Number
Description

D F O A 1 0 9 A N C A 1 AA B 1 2 0 0 0 A
1,2,3
Digits 1,2,3 — Unit Description
DFO = Direct Fired Outdoor Unit
Digit 4 — Development Sequence
A = First Generation
Digits 5,6,7 — Unit Size
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
Digit 8 — Main Power Supply
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
Digit 9 — Fuel
N = Natural Gas
P = LP Gas (Propane)
S = Special
Digit 10 — Design Sequence
C =Third Design
Digit 11 — Gas Control Option
A = Series 14 Constant Discharge
Temperature
B = Series 44 Space Temperature Control
S = Special
Digit 12 — Type Gas Train Approvals
1 = Standard
3 = IRI
4 = FM
S = Special
Digits 13,14 — Burner Input Rating (MBh)
AA = 275 MBh Input
AB = 550 MBh Input
AC = 825 MBh Input
AD = 990 MBh Input
AE = 1100 MBh Input

8

AF
AG
AH
AJ
AK
AL
AN
AP
AQ
AR
AT
AV
AW
AX
AY
AZ
A1
A2
A3
A4
A5
A6
A7
A8
A9
SS

4 5,6,7 8 9 10 11 12 13,14 15 16 17 18 19 20 21

= 1375 MBh Input
= 1650 MBh Input
= 1925 MBh Input
= 2200 MBh Input
= 2475 MBh Input
= 2750 MBh Input
= 3025 MBh Input
= 3300 MBh Input
= 3575 MBh Input
= 3850 MBh Input
= 4125 MBh Input
= 4400 MBh Input
= 4675 MBh Input
= 4950 MBh Input
= 5225 MBh Input
= 5500 MBh Input
= 5775 MBh Input
= 6050 MBh Input
= 6325 MBh Input
= 6600 MBh Input
= 6875 MBh Input
= 7150 MBh Input
= 7425 MBh Input
= 7700 MBh Input
= 7975 MBh Input
= Special

Digit 15 — Blower Motor HP
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
J = 10 HP Motor
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
Digit 16 — Motor Speed and Starter
0 = No Selection
1 = Single Speed ODP 1800 RPM
2 = Single Speed TEFC 1800 RPM
3 = Single Speed Energy Efficient ODP
1800 RPM
4 = Single Speed Energy Efficient TEFC
1800 RPM
5 = 2S1W ODP 1800/900 RPM
6 = 2S2W ODP 1800/1200 RPM
S = Special

Digit 17 — Fan Discharge*
Horizontal Arrangement
1 = Arrangement 1, Top
2 = Arrangement 2, Side
3 = Arrangement 3, Bottom
*Select arrangements from page 6.

Vertical Arrangement
4 = Arrangement 4, Side
5 = Arrangement 5, Top
6 = Arrangement 6, Side
*Select arrangements 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
0 = No Selection
A = V-Bank Filter Section with Permanent
Filters
B = V-Bank Filter Section without Filters
Digit 20 — Dampers/Mixing Box
0 = No Selection
A = Motorized RA Damper
B = Motorized 75/25 Damper
C = Mixing Box —Temperature Control
D = Mixing Box — Building Pressure
Control
E = Mixing Box — Manual Control
Digit 21 — Miscellaneous Options
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
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
R = Interlocking Relay
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
S = Special
8 = Low Gas Pressure Burner
MUA-PRC001-EN

Performance
Data

Table PD-1 — Direct-Fired Outdoor Unit
Models
DFO

Blower
Size

109

1-9”

112

1-12”

115

1-15”

118

1-18”

215

2-15”

218

2-18”

220

2-20”

222

2-22”

225

2-25”

230

2-30”

CFM
STD Air
@ 70
1600
1800
2000
2250
2500
2750
3000
3250
3500
3750
4000
4250
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
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

FPM
Outlet
Velocity
1915
2155
2390
2690
2990
3290
3585
2180
2360
2540
2720
2900
2190
2430
2670
2910
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

¼”
¾
1
1½
1½
2
2
3
1½
2
2
3
3
2
3
3
5
3
5
5
5
5
5
5
5
5
7½
7½
7½
7½
7½
7½
7½
10
10
7½
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

Total External Static Pressure (WC)
3/8”
½”
¾”
1”
1 ¼” 1 ½”
HP
1
1
1
—
—
—
1
1
1½
1½
1½
—
1
1½
1½
1½
2
2
1½ 1½
2
2
2
2
2
2
2
2
3
3
2
2
3
3
3
3
3
3
3
3
3
5
2
2
2
3
3
3
2
2
3
3
3
3
2
3
3
3
3
3
3
3
3
3
3
5
3
3
3
3
5
5
2
3
3
3
3
5
3
3
3
3
5
5
3
3
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
7½
5
5
5
5
7½
7½
5
5
7½
7½
7½
7½
5
7½
7½
7½
7½
7½
5
5
5
7½
—
—
5
5
5
7½
7½
—
5
5
7½
7½
7½
7½
5
7½
7½
7½
7½
7½
7½ 7½
7½
7½
7½
10
7½ 7½
7½
7½
10
10
7½ 7½
7½
10
10
10
7½ 7½
7½
7½
—
—
7½ 7½
7½
10
10
—
7½ 7½
10
10
10
15
10
10
10
10
15
15
10
10
10
15
15
15
10
10
15
15
15
15
10
10
10
15
15
15
10
10
10
15
15
15
10
10
15
15
15
15
15
15
15
15
15
20
15
15
15
15
20
20
15
15
15
15
20
20
15
15
15
20
20
20
15
15
20
20
20
20
20
20
20
20
20
25
15
15
15
20
20
20
15
15
20
20
20
20
15
15
20
20
20
20
20
20
20
20
25
25
20
20
20
25
25
25
20
20
20
25
25
25
20
20
25
25
25
30
15
15
15
20
20
—
15
15
20
20
20
25
20
20
20
20
25
25
20
20
20
25
25
30
20
20
25
25
30
30
25
25
25
30
30
30
25
25
30
30
40
40
30
30
30
40
40
40
30
30
40
40
40
40
20
20
25
25
30
—
25
25
25
30
30
40
25
30
30
40
40
40
30
30
40
40
40
40
40
40
40
40
50
50
40
40
50
50
50
50

2”
—
—
—
3
3
3
5
3
5
5
5
5
—
5
5
7½
7½
7½
7½
7½
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

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
.13” WC
Fresh Air Inlet Hood With Filters
.25” WC
Motor Operated Inlet Damper
.13” WC
Motor Operated Discharge Damper
.13” WC
V-Bank Filter Section
.25” WC
Mixing Box .
40” WC

MUA-PRC001-EN

9

Performance
Data

Table PD-2 — Direct-Fired Outdoor Unit — Burner Selection (MBh Input)
Models
DFO

109

112

115

118

215

218

220

222

225

230

CFM
Std Air
70 F
1600
1800
2000
2250
2500
2750
3000
3250
3500
3750
4000
4250
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
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

70 F
Rise
131
148
164
185
205
226
247
267
288
308
329
349
370
411
452
493
534
575
616
657
698
740
781
822
863
904
945
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

80 F
Rise
150
169
188
211
235
258
282
305
329
352
376
399
423
470
517
563
610
657
704
751
798
845
892
939
986
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

90 F
Rise
169
190
211
238
264
291
317
343
370
396
423
449
475
528
581
634
687
740
792
845
898
951
1004
1057
1109
1162
1215
1268
1321
1373
1479
1585
1690
1796
1902
2007
2113
2219
2324
2430
2536
2641
2747
2641
2747
2853
2958
3064
3170
3275
3170
3381
3592
3803
4015
4226
4437
4649
4860
4649
5071
5494
5917
6339
6762

100 F
Rise
188
211
235
264
293
323
352
382
411
440
470
499
528
587
646
704
763
822
880
939
998
1057
1115
1174
1233
1291
1350
1409
1467
1526
1643
1761
1878
1996
2113
2230
2348
2465
2583
2700
2817
2935
3052
2935
3052
3170
3287
3404
3522
3639
3522
3757
3991
4226
4461
4696
4930
5165
5400
5165
5635
6104
6574
7043
7513

110 F
Rise
207
232
258
291
323
355
387
420
452
484
517
549
581
646
710
775
839
904
968
1033
1098
1162
1227
1291
1356
1420
1485
1550
1614
1679
1808
1937
2066
2195
2324
2453
2583
2712
2841
2970
3099
3228
3357
3228
3357
3487
3616
3745
3874
4003
3874
4132
4390
4649
4907
5165
5423
5682
5940
5682
6198
6715
7231
7748
—

120 F
Rise
225
254
282
317
352
387
423
458
493
528
563
599
634
704
775
845
916
986
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
—
—
—

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

Gas
Piping

Component Identification
GP-09 Pilot Gas Pressure Regulator
GP-11
Main Gas Shutoff Valve
GP-13 Pilot Gas Shutoff Valve
GP-17 Auxiliary Gas Shutoff Valve
GP-18 Auxiliary Gas Shutoff Valve
GP-27 Orificed Needle Valve
VG-01 Pilot Gas Valve
VG-02 Main Gas Valve
VG-03 Auxiliary Gas Valve
VG-04 N/O Vent Valve
VG-07 Maxitrol Modulating Valve
PS-04 Low Gas Pressure Switch
PS-07 High Gas Pressure Switch
MUA-PRC001-EN

Notes:
1
Vents to outside furnished by factory
on outdoor units.
2
Under 825 MBh will require an additional
gas pressure regulator if inlet
pressure exceeds 1 psig.
3
4400 MBh and above will require a
minimum inlet pressure of 1 psig. For
inlet pressure under 1 psig, contact
factory.

4
For inlet pressure under 10” WC, contact
factory.
5
Contact factory for manifold required for
CGA.
*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.

11

Gas
Piping

Table GP-1— Gas Pressure Regulator Selection
If Burner Size (BS) Is:
BS < 825

990 < BS < 4125

4400 < BS < 7975

12

And Gas Pressure (GP) Is:
GP< 7” WC

Then:
Call factory to verify availability and pricing

7”WC < GP < 10” WC

Use low gas pressure burner

10”WC < GP < 1 PSI

No low gas pressure burner or high gas pressure regulator required

1 PSI < GP < 5 PSI

Use high gas pressure regulator 1-5 PSI

5 PSI < GP < 10 PSI

Use high gas pressure regulator 5-10 PSI

10 PSI < GP < 50 PSI

Use high gas pressure regulator over 10 PSI

50 PSI < GP

Call factory to verify availability and pricing

GP < 7” WC

Call factory to verify availability and pricing

7” WC < GP < 10” WC

Use low gas pressure burner

10” WC < GP < 5 PSI

No low gas pressure burner or high gas pressure regulator required

5 PSI < GP < 10 PSI

Use high gas pressure regulator 5-10 PSI

10 PSI < GP < 50 PSI

Use high gas pressure regulator over 10 PSI

50 PSI < GP

Call factory to verify availability and pricing

GP < 1 PSI

Call factory to verify availability and pricing

1 PSI < GP < 5 PSI

No low gas pressure burner or high gas pressure regulator required

5 PSI < GP < 10 PSI

Use high gas pressure regulator 5-10 PSI

10 PSI < GP < 50 PSI

Use high gas pressure regulator over 10 PSI

50 PSI < GP

Call factory to verify availability and pricing

MUA-PRC001-EN

Gas
Piping

Table GP-2 — Gas Pipe Connection Size — Direct-Fired Units — IRI Gas Train — R/A Meeting ETL
MBH
275
550
825
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

6-7"
1"
1 ¼"
2"
2"
2"
N/A
N/A
N/A
2 ½"
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
N/A
N/A

8-11"
¾"
1"
1 ¼"
1 ¼"
1 ½"
1 ½"
2"
2"
2"
2"
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
N/A

12-14"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ½"
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"
3"
3"
N/A
N/A
N/A
N/A
N/A
N/A

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼“
1 ¼”
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
2"
1 ½"
1 ¼"
1 ¼"
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"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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"
2 ½"
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

3 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
2"
2"
2"
2"
2"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
3"
3"
3"
3"
3"
N/A
N/A
N/A

4 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
2"
2"
2"
2"
2"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
3"
3"
3"
3"
3"
N/A
N/A
N/A

5 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
2"
2"
2"
2"
2"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
3"
3"
3"
3"
3"
N/A
N/A
N/A

3 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
N/A
N/A
N/A

4 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
N/A
N/A
N/A

5 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
N/A
N/A
N/A

Table GP-3 — Gas Pipe Connection Size — Direct-Fired Units — FM Gas Train — R/A Meeting ETL
MBH
275
550
825
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
MUA-PRC001-EN

6-7"
1"
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

8-11"
¾"
1"
1 ¼"
1 ¼"
1 ½"
1 ½"
2"
2"
2"
2"
2"
2 ½"
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

12-14"
¾"
¾"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ½"
1 ½"
2"
2"
2"
2"
2"
2"
2"
2"
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

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ½"
1 ¼"
1 ¼"
1¼"
1¼"
1 ¼"
1 ¼"
1¼"
1¼"
1 ¼"
1 ¼"
1¼"
1¼"
1 ¼"
1 ¼"
1¼"
1¼"
1 ¼"
1 ¼"
1 ½"
1¼"
1 ¼"
1 ¼"
1 ½"
1¼"
1 ¼"
1 ¼"
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"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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"
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

13

Gas
Piping

Table GP-4 — Gas Pipe Connection Size — Direct-Fired Units — Standard Gas Train — R/A Meeting ETL
MBH
275
550
825
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

6-7"
1"
1 ¼"
1 ½"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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

8-11"
¾"
1"
1 ¼"
1 ¼"
1 ½"
1 ½"
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
3
3
3
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A

12-14"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ½"
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
3
3
N/A
N/A
N/A

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
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"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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
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

3 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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
3
3
N/A
N/A
N/A

4 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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
3
3
N/A
N/A
N/A

5 psi
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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
3
3
N/A
N/A
N/A

3 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
N/A
N/A
N/A
N/A

4 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
N/A
N/A
N/A
N/A

5 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
N/A
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
MBH
275
550
825
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
12,100

14

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"
1"
N/A
1 ½"
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

12-14"
¾"
¾"
1"
1 ¼"
1 ¼"
1 ½"
2"
2"
2"
2"
2"
2"
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

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
2"
1 ½"
1 ¼"
1 ¼"
2"
1 ½"
1 ¼"
1 ¼"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2 ½"
2"
2"
2 ½"
2 ½"
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"
3"
2 ½"
2 ½"
2 ½"
3"
2 ½"
2 ½"
2 ½"
3"
2 ½"
2 ½"
2 ½"
N/A
2 ½"
2 ½"
2 ½"
N/A
3"
2 ½"
2 ½"
N/A
3"
3"
3"
N/A
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

MUA-PRC001-EN

Gas
Piping

Table GP-6 — Gas Pipe Connection Size— Direct-Fired Units — FM Gas Train — 100% OA or R/A Not ETL
MBH
275
550
825
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
12,100

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"
1"
1 ¼"
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

12-14"
¾"
¾"
1"
1 ¼"
1 ¼"
1 ¼"
1 ½"
2"
2"
2"
2"
2"
2"
2"
2 ½"
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

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
2"
2"
1 ½"
1 ½"
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"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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"
3"
2 ½"
2 ½"
2 ½"
3"
2 ½"
2 ½"
2 ½"
3"
2 ½"
2 ½"
2 ½"
N/A
2 ½"
2 ½"
2 ½"
N/A
3"
2 ½"
2 ½"
N/A
3"
3"
3"
N/A
3"
3"
3"
N/A
3"
3"
3"
N/A
N/A
3"
3"
N/A
N/A
CF
CF
N/A
N/A
CF
CF

3 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
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"
2 ½"
3"
3"
3"
3"
CF
CF

4 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
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"
2 ½"
3"
3"
3"
3"
CF
CF

5 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
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"
2 ½"
3"
3"
3"
3"
CF
CF

4 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
CF
CF

5 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
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
MBH
275
550
825
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
12,100

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"
1"
N/A
2"
2"
2"
N/A
2 ½"
2 ½"
2 ½"
2 ½"
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
N/A

12-14"
¾"
¾"
1"
1 ¼"
1 ¼"
1 ¼"
1 ½"
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"
3"
3"
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A

Inlet Gas Pressure (inches of water column)
15-20"
21-27"
1 psi
2 psi
¾"
¾"
¾"
¾"
¾"
¾"
¾"
¾"
1"
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
1 ½"
1 ¼"
1 ¼"
1 ¼"
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"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2"
2"
2"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
2 ½"
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"
3"
2 ½"
2 ½"
2 ½"
3"
3"
3"
3"
N/A
3"
3"
3"
N/A
3"
3"
3"
N/A
3"
3"
3"
N/A
N/A
CF
CF
N/A
N/A
CF
CF

3 psi
¾"
¾"
¾"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
1 ¼"
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"
3"
3"
3"
CF
CF

Note:
CF=Contact Factory

MUA-PRC001-EN

15

Controls

System 14 — Constant Discharge Air Temperatures

À

Á

Â

Ã

Ä
Optional

Component Description

System 14 Applications

Fan Switch On

1
Remote Temperature Selector
Not temperature sensitive. Mounted on
remote control station.
2
Air Sensor
Installed in blower discharge.
3
Amplifier
Installed in electrical control panel.
Contains wiring terminals, sensitivity
adjustments and one calibrating
potentiometer.
4
Modulator/Regulator Valve
Mounted in gas piping manifold.
Receives electrical signal from amplifier
and adjusts gas pressure to maintain
desired temperature.
5
Remote Control Station
Optional

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.

Control Operation
Desired temperature at Á is set at the
remote temperature selector À.The air
sensor Á senses leaving air temperature
and sends an electrical signal to the
amplifier Â.The amplifier then sends an
electrical signal to the modulator/
regulator valve Ã, which adjusts gas
pressure to the burner, maintaining the
desired temperature at Á.
Control Sequence with Fan and
Heat Switches
Fan and heat switches are included
when a remote control station is ordered
as an option.

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 Switch Off
Optional damper closes, damper end
switch opens, fan motor starter is deenergized, fan is off.
Heat Switch 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.
Heat Switch Off
Heat is off.

16

MUA-PRC001-EN

Controls

System 44 — Space Temperature Control

À

Á

Component Description
1
Selectrastat™
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.
3
Amplifier
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.
5
Remote Control Station
Optional
MUA-PRC001-EN

Â

Ã

Ä

Optional

System 44 Applications
Provides space temperature control
electronically and is ideal for commercial
and industrial buildings.

Fan Switch On
Optional damper opens, damper end
switch closes, fan motor starter is
energized, fan runs.

Temperature Control Operation
Desired temperature at À 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 Á will signal the amplifier Â,
which will adjust the discharge air
temperature to a higher or lower level
via the modulator/regulator valve Ã.
When the space temperature
approaches the assigned setting, the
Selectrastat resumes control.

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 Sequence with Fan and
Heat Switches
Fan and heat switches are included
when the remote control station is
ordered as an option.

Fan Switch Off
Optional damper closes, damper end
switch opens, fan motor starter is deenergized, fan is off.
Heat Switch 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.
Heat Switch Off
Heat is off.
17

Electric
Power

Table EP-1 — Motor Electrical Data — Single-Speed Motor

HP
¾
1
1½
2
3
5
7½
10
15
20
25
30
40
50
60

115
11.0
12.6
20.0
21.0
32.0
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA

ODP — 1800 RPM
Single Phase
208
230
208
5.4
5.5
2.5
6.2
6.3
3.5
10.5
10.0
5.0
12.6
10.5
6.3
16.8
16.0
9.5
25.0
23.0
15.4
33.0
31.0
22.0
NA
42.0
26.4
NA
NA
42.0
NA
NA
53.0
NA
NA
72.0
NA
NA
78.0
NA
NA
108.0
NA
NA
140.0
NA
NA
NA

3-Phase
230
2.6
2.8
4.2
5.6
8.0
13.2
20.0
25.2
40.6
50.0
59.0
71.0
95.6
120.0
145.0

460
1.3
1.4
2.1
2.8
4.0
6.6
10.0
12.6
20.3
25.0
29.5
35.5
47.8
60.0
72.5

Energy-Effic. ODP
1800 RPM
3-Phase
208
230
460
NA
NA
NA
3.1
2.7
1.4
4.5
3.9
2.0
6.0
5.2
2.6
8.7
7.8
3.9
13.8
12.0
6.0
22.5
19.6
9.8
28.0
24.4
12.2
42.1
36.6
18.3
55.2
48.0
24.0
67.3
57.0
28.5
81.0
69.0
34.5
NA
92.0
46.0
NA
116.0
58.0
NA
144.0
72.0

TEFC
1800 RPM
3-Phase
208
230
3.2
3.0
3.6
2.8
5.0
4.2
6.5
5.6
8.5
8.2
15.0
13.4
21.5
19.2
28.0
25.2
NA
38.8
NA
48.0
NA
60.0
NA
76.0
NA
94.0
NA 120.0
NA 140.0

460
1.5
1.4
2.1
2.8
4.1
6.7
9.6
12.6
19.4
24.0
30.0
38.0
47.0
60.0
70.0

Energy-Effic. TEFC
1800 RPM
3-Phase
208
230
460
NA
NA
NA
3.1
2.7
1.35
4.5
3.9
1.95
6.1
5.3
2.65
8.8
7.6
3.8
14.2
12.4
6.2
21.4
18.6
9.3
29.0
25.0
12.5
41.2
36.6
18.3
53.8
49.0
24.5
63.5
57.0
28.5
79.8
69.0
34.5
NA
92.0
46.0
NA
116.0
58.0
NA
142.0
71.0

Notes:
NA = Not Available
FLA based on NEC ratings

Table EP-2— Motor Electrical Data — Two-Speed Motor

HP
¾
1
1½
2
3
5
7½
10
15
20
25
30
40
50
60

208
NA
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
NA
NA
NA
NA

2-Speed/1-Winding
1800/900 RPM
3-Phase
230
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
NA
NA
NA
NA

460
NA
1.8/.75
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

208
NA
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
NA
NA
NA
NA

2-Speed/2-Winding
1800/1200 RPM
3-Phase
230
NA
3.4/2.2
4.9/2.8
5.9/3.8
8.4/4.8
15.5/10.2
19.5/12.3
28.0/17.5
54.0/21.0
51.0/27.0
NA
NA
NA
NA
NA

460
NA
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

Notes:
NA = Not Available
FLA based on NEC ratings

18

MUA-PRC001-EN

Dimension and
Weights

Horizontal Arrangement — Single Blower
109 112 115 118

Item

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-1
Model
109
112
115
118

A
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

B
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

C
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

E
F
G
10-3/8" 1' 3-1/8" 1' 2-7/16"
(264) (384) (367)
1' 1-9/16" 1' 1-9/16" 1' 2-7/16"
(344) (344) (367)
1' 4" 1' 0-3/8" 1' 7-7/8"
(406) (314) (505)
1' 7" 1' 0-3/8" 1' 7-7/8"
(483) (314) (505)

H
11-11/16"
(297)
11-11/16"
(297)
6-15/16"
(176)
6-15/16"
(176)

L
M
1' 2-½" 11-15/16"
(368) (303)
1' 0-5/8" 1' 3-15/16"
(321) (405)
11-1/8" 1' 6-15/16"
(283) (481)
7-7/8" 1' 10-1/16"
(200) (560)

R
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)

S
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)

T
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)

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

19

Dimension and
Weights

Horizontal Arrangement — Double Blower
215 218 220 222 225 230

Item

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-2
Model
215
218
220
222
225
230

A
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
5' 0"
(1524)
5' 0"
(1524)

B
7' 10"
(2388)
7' 10"
(2388)
10' 10"
(3302)
10' 10"
(3302)
12' 10"
(3912)
12' 10"
(3912)

C
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

E
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

F
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 1-3/16"
(335)
1' 1-3/16"
(335)
1' 5-9/16"
(446)
1' 5-9/16"
(446)

G
1' 7-7/8"
(505)
1' 7-7/8"
(505)
2' 4-¼"
(718)
2' 4-¼"
(718)
3' 1-¾"
(959)
3' 1-¾"
(959)

H
7-1/8"
(181)
7-1/8"
(181)
11-½"
(292)
11-½"
(292)
1' 2-½"
(368)
1' 2-½"
(368)

J
1' 10-½"
(572)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

L
7-7/8"
(200)
7-7/8"
(200)
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 3-3/8"
(391)
1' 3-3/8"
(391)

M
R
1' 6-15/16"
1' 9"
(481)
(533)
1' 10-1/16" 1' 9"
(560)
(533)
2' 1-1/16"
2' 7"
(637)
(787)
2' 3-9/16”
2' 7"
(700)
(787)
2' 7-½" 2' 1-¾"
(800)
(654)
3' 1"
2' 1-¾"
(940)
(654)

S
2' 9"
(838)
2' 9"
(838)
3' 2"
(965)
3' 2"
(965)
2' 9"
(838)
2' 9"
(838)

T
2' 9"
(838)
2' 9"
(838)
3' 3"
(991)
3' 3"
(991)
4' 3"
(1295)
4' 3"
(1295)

U
1' 9"
(533)
1' 9"
(533)
2' 7"
(787)
2' 7"
(787)
1' 8"
(508)
1' 8"
(508)

X
4-½"
(114)
4-1/2"
(114)
0' 8"
(203)
0' 8"
(203)
1' 2"
(356)
1' 2"
(356)

Y
5-¾"
(146)
5-¾"
(146)
7-1/8"
(181)
7-1/8"
(181)
6-¼"
(159)
6-¼"
(159)

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

MUA-PRC001-EN

Dimension 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

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-3
Model
109
112
115
118

A
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

B
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

C
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

E
F
G
10-3/8" 1' 3-1/8" 1' 2-7/16"
(264) (384) (367)
1' 1-9/16" 1' 1-9/16" 1' 2-7/16"
(344) (344) (367)
1' 4" 1' 0-3/8" 1' 7-7/8"
(406) (314) (505)
1' 7" 1' 0-3/8" 1' 7-7/8"
(483) (314) (505)

H
11-11/16"
(297)
11-11/16"
(297)
6-15/16"
(176)
6-15/16"
(176)

L
M
1' 2-½" 11-15/16"
(368) (303)
1' 0-5/8" 1' 3-15/16"
(321) (405)
11-1/8" 1' 6-15/16"
(283) (481)
7-7/8" 1' 10-1/16"
(200) (560)

R
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)

S
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)

T
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)

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

21

Dimension 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

Item

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-4
Model A
215 3' 0"
(914)
218 3' 0"
(914)
220 4' 0"
(1219)
222 4' 0"
(1219)
225 5' 0"
(1524)
230 5' 0"
(1524)

B
7' 10"
(2388)
7' 10"
(2388)
10' 10"
(3302)
10' 10"
(3302)
12' 10"
(3912)
12' 10"
(3912)

C
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

E
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

F
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 1-3/16"
(335)
1' 1-3/16"
(335)
1' 5-9/16"
(446)
1' 5-9/16"
(446)

G
1' 7-7/8"
(505)
1' 7-7/8"
(505)
2' 4-¼"
(718)
2' 4-¼"
(718)
3' 1-¾"
(959)
3' 1-¾"
(959)

H
7-1/8"
(181)
7-1/8"
(181)
11-½"
(292)
11-½"
(292)
1' 2-½"
(368)
1' 2-½"
(368)

J
1' 10-½"
(572)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

L
7-7/8"
(200)
7-7/8"
(200)
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 3-3/8"
(391)
1' 3-3/8"
(391)

M
1’6-15/16"
(481)
1’10-1/16"
(560)
2’1-1/16"
(637)
2' 3-9/16"
(700)
2' 7-½"
(800)
3' 1"
(940)

N
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)
11-13/16"
(300)
11-13/16"
(300)

P
R
S
T
U
5' 5-¾" 1’9”
2’9” 2’5” 1’9”
(1670) (533) (838) 737) (533)
5' 5-¾" 1’9”
2’9” 2’5” 1’9”
(1670) (533) (838) 737) (533)
7' 3-3/8" 2’9”
3’2” 3’3” 2’7”
(2219) (838) (965) (991) (787)
7' 3-3/8" 2’9”
3’2” 3’3” 2’7”
(2219) (838) (965) (991) (787)
9' 3-3/8" 2’1-¾” 3’2” 4’3” 1’8”
(2829) (654) (965) (1295) (508)
9' 3-3/8" 2’1-¾” 2’9” 4’3” 1’8”
(2829) (654) (838) (1295) (508)

W
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 8-¼"
(514)
1' 8-¼"
(514)

X
4-½"
(114)
4-½"
(114)
0' 8"
(203)
0' 8"
(203)
1' 2"
(356)
1' 2"
(356)

Y
5-¾"
(146)
5-¾"
(146)
7-1/8"
(181)
7-1/8"
(181)
6-¼"
(159)
6-¼"
(159)

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

MUA-PRC001-EN

Dimension and
Weights

Horizontal Arrangement — Single Blower
With Mixing Box
109 112 115 118

Item

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-5
Model
109
112
115
118

A
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

B
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

C
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

E
F
G
10-3/8" 1' 3-1/8" 1' 2-7/16"
(264) (384) (367)
1' 1-9/16" 1' 1-9/16" 1' 2-7/16"
(344) (344) (367)
1' 4" 1' 0-3/8" 1' 7-7/8"
(406) (314) (505)
1' 7" 1' 0-3/8" 1' 7-7/8"
(483) (314) (505)

H
11-11/16"
(297)
11-11/16"
(297)
6-15/16"
(176)
6-15/16"
(176)

L
M
1' 2-½" 11-15/16"
(368) (303)
1' 0-5/8" 1' 3-15/16"
(321) (405)
11-1/8" 1' 6-15/16"
(283) (481)
7-7/8" 1' 10-1/16"
(200) (560)

R
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)
1' 9"
(533)

S
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)
2' 9"
(838)

T
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)
2' 5"
(737)

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

23

Dimension and
Weights

Horizontal Arrangement — Double Blower
With Mixing Box
215 218 220 222 225 230

Item

Unit Components

1
2
3
4
5
6
7
8
9
10
11

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
Unit Base

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.

Table DW-6
Model
215
218
220
222
225
230

A
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
5' 0"
(1524)
5' 0"
(1524)

B
7' 10"
(2388)
7' 10"
(2388)
10' 10"
(3302)
10' 10"
(3302)
12' 10"
(3912)
12' 10"
(3912)

C
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

E
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

F
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 1-3/16"
(335)
1' 1-3/16"
(335)
1' 5-9/16"
(446)
1' 5-9/16"
(446)

G
1' 7-7/8"
(505)
1' 7-7/8"
(505)
2' 4-¼"
(718)
2' 4-¼"
(718)
3' 1-¾"
(959)
3' 1-¾"
(959)

H
7-1/8"
(181)
7-1/8"
(181)
11-½"
(292)
11-½"
(292)
1' 2-½"
(368)
1' 2-½"
(368)

J
1' 10-½"
(572)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

L
7-7/8"
(200)
7-7/8"
(200)
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 3-3/8"
(391)
1' 3-3/8"
(391)

M
R
1' 6-15/16"
1' 9"
(481)
(533)
1' 10-1/16" 1' 9"
(560)
(533)
2' 1-1/16"
2' 7"
(637)
(787)
2' 3-9/16”
2' 7"
(700)
(787)
2' 7-½" 2' 1-¾"
(800)
(654)
3' 1"
2' 1-¾"
(940)
(654)

S
2' 9"
(838)
2' 9"
(838)
3' 2"
(965)
3' 2"
(965)
2' 9"
(838)
2' 9"
(838)

T
2' 9"
(838)
2' 9"
(838)
3' 3"
(991)
3' 3"
(991)
4' 3"
(1295)
4' 3"
(1295)

U
1' 9"
(533)
1' 9"
(533)
2' 7"
(787)
2' 7"
(787)
1' 8"
(508)
1' 8"
(508)

X
4-½"
(114)
4-½"
(114)
0' 8"
(203)
0' 8"
(203)
1' 2"
(356)
1' 2"
(356)

Y
5-¾"
(146)
5-¾"
(146)
7-1/8"
(181)
7-1/8"
(181)
6-¼"
(159)
6-¼"
(159)

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

MUA-PRC001-EN

Dimension and
Weights

Vertical Arrangement — Single Blower
100% Outside Air—Arrangement 4

Table DW-7
Model
109
112
115
118

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

B
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

C
1' 2-½"
(368)
1' ½"
(318)
11-1/8"
(283)
7-7/8"
(200)

D
1' 3-1/8"
(384)
1' 1-9/16"
(344)
1' 3/8"
(314)
1' 3/8"
(314)

E
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

F
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

G
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

H
11' 3"
(3429)
11' 3"
(3429)
11' 3"
(3429)
11' 3"
(3429)

J
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)

K
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)

L
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

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

Dimension and
Weights

Vertical Arrangement —Double Blower
100% Outside Air—Arrangement 4

Table DW-8
Model
215
218
220
222
225
230

A
B
C
D
1' 4" 1' 6-15/16" 0' 7-7/8" 1' 0-3/8"
(406) (481) (200) (314)
1' 7" 1' 10-1/16"0' 7-7/8" 1' 0-3/8"
(483) (560) (200) (314)
2' 0-7/8" 2' 1-1/16" 1' 0-3/8" 1‘ 1-3/16”
(632) (637) (314) (335)
2' 3-3/8" 2' 3-9/16" 1' 0-3/8" 1‘ 1-3/16”
(695) (700) (314) (335)
2' 7-3/8" 2' 7-½" 1' 3-3/8" 1‘ 5-9/16”
(797) (800) (391) (446)
3' 0-7/8" 3' 1" 1' 3-3/8" 1‘ 5-9/16”
(937) (940) (391) (446)

E
3' 0"
(914)
3' 0"
(914)
4’ 0"
(1219)
4’ 0"
(1219)
5’ 0"
(1524)
5’ 0"
(1524)

F
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)

G
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

H
11' 3"
(3429)
11' 3"
(3429)
13' 10"
(4216)
13' 10"
(4216)
14' 4"
(4369)
14' 4"
(4369)

J
0' 3"
(76)
0' 3"
(76)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)

K
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
2' 4"
(711)
2' 4"
(711)

L
P
7' 10" 1‘ 10-¼"
(2388) (565)
7' 10" 1' 4"
(2388) (406)
10' 10" 2' 5-5/8"
(3302) (752)
10' 10" 2' 5-5/8"
(3302) (752)
12' 10" 3' 1-5/8"
(3912) (956)
12' 10" 2' 2-5/8"
(3912) (676)

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

MUA-PRC001-EN

Dimension and
Weights

Vertical Arrangement — Single Blower
Return Air Downstream of Burner—Arrangement 4

Table DW-9
Model
109
112
115
118

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

B
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

C
1' 2-½"
(368)
1' ½"
(318)
11-1/8"
(283)
7-7/8"
(200)

D
1' 3-1/8"
(384)
1' 1-9/16"
(344)
1' 3/8"
(314)
1' 3/8"
(314)

E
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

F
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

G
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

H
11' 3"
(3429)
11' 3"
(3429)
11' 3"
(3429)
11' 3"
(3429)

J
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)

K
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)

L
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

M
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)

N
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)

P
2' 3-¾"
(705)
2' 3-¾"
(705)
2' 3-¾"
(705)
2' 3-¾"
(705)

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

Dimension and
Weights

Vertical Arrangement — Double Blower
Return Air Downstream of Burner—Arrangement 4

Table DW-10
Model
215
218
220
222
225
230

A
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

B
1' 6-15/16"
(481)
1' 10-1/16"
(560)
2' 1-1/16"
(637)
2' 3-9/16"
(700)
2' 7-½"
(800)
3' 1"
(940)

C
7-7/8"
(200)
7-7/8"
(200)
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 3-3/8"
(391)
1' 3-3/8"
(391)

D
1' 0-3/8"
(314)
1' 3/8"
(314)
1' 1-3/16"
(335)
1' 1-3/16"
(335)
1' 5-9/16"
(446)
1' 5-9/16"
(446)

E
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
5' 0"
(1524)
5' 0"
(1524)

F
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)

G
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

H
11' 3"
(3429)
11' 3"
(3429)
13' 10"
(4216)
13' 10"
(4216)
14' 4"
(4369)
14' 4"
(4369)

J
0' 3"
(76)
0' 3"
(76)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)

K
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
2' 4"
(711)
2' 4"
(711)

L
7' 10"
(2388)
7' 10"
(2388)
10' 10"
(3302)
10' 10"
(3302)
12' 10"
(3912)
12' 10"
(3912)

M
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 8-¼"
(514)
1' 8-¼"
(514)

N
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)
1' 7"
(483)
1' 0-5/16"
(313)
1' 0-5/16"
(313)

P
5' 5-¾"
(1670)
5' 5-¾"
(1670)
7' 3-3/8"
(2219)
7' 3-3/8"
(2219)
9' 3-3/8"
(2829)
9' 3-3/8"
(2829)

R
1' 10-¼"
(565)
1' 4"
(406)
2' 5-5/8"
(752)
2' 5-5/8"
(752)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

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

Dimension and
Weights

Vertical Arrangement
Single Blower with Mixing Box—Arrangement 4

Table DW-11
Model
109
112
115
118

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

B
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

C
1' 2-½"
(368)
1' ½"
(318)
11-1/8"
(283)
7-7/8"
(200)

D
1' 3-1/8"
(384)
1' 1-9/16"
(344)
1' 3/8"
(314)
1' 3/8"
(314)

E
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

F
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)

G
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)
6' 5"
(1956)

H
13' 11"
(4242)
13' 11"
(4242)
13' 11"
(4242)
13' 11"
(4242)

J
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)
0' 3"
(76)

K
4' 6"
(1372)
4' 6"
(1372)
4' 6"
(1372)
4' 6"
(1372)

L
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)
4' 4"
(1321)

M
1' 8-¼"
(514)
1' 8-¼"
(514)
1' 8-¼"
(514)
1' 8-¼"
(514)

N
3' 6"
(1067)
3' 6"
(1067)
3' 6"
(1067)
3' 6"
(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.

MUA-PRC001-EN

29

Dimension and
Weights

Vertical Arrangement
Double Blower With Mixing Box—Arrangement 4

Table DW-12
Model
215
218
220
222
225
230

A
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

B
1' 6-15/16"
(481)
1' 10-1/16"
(560)
2' 1-1/16"
(637)
2' 3-9/16"
(700)
2' 7-½"
(800)
3' 1"
(940)

C
7-7/8"
(200)
7-7/8"
(200)
1' 0-3/8"
(314)
1' 0-3/8"
(314)
1' 3-3/8"
(391)
1' 3-3/8"
(391)

D
1' 3/8"
(314)
1' 3/8"
(314)
1' 1-3/16"
(335)
1' 1-3/16"
(335)
1' 5-9/16"
(446)
1' 5-9/16"
(446)

E
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
5' 0"
(1524)
5' 0"
(1524)

F
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)
4' 0"
(1219)

G
6' 5"
(1956)
6' 5"
(1956)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)
8' 0"
(2438)

H
13' 11"
(4242)
13' 11"
(4242)
17' 0"
(5182)
17' 0"
(5182)
17' 5"
(5309)
17' 5"
(5309)

J
0' 3"
(76)
0' 3"
(76)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)
0' 4"
(102)

K
4' 6"
(1372)
4' 6"
(1372)
5' 0"
(1524)
5' 0"
(1524)
5' 5"
(1651)
5' 5"
(1651)

L
7' 10"
(2388)
7' 10"
(2388)
10' 10"
(3302)
10' 10"
(3302)
12' 10"
(3912)
12' 10"
(3912)

M
1' 8-¼"
(514)
1' 8-¼"
(514)
1' 8-¼"
(514)
1' 8-¼"
(514)
2' 2-¼"
(667)
2' 2-¼"
(667)

N
7' 0"
(2134)
7' 0"
(2134)
10' 0"
(3048)
10' 0"
(3048)
12' 0"
(3658)
12' 0"
(3658)

P
1' 10-¼"
(565)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(957)
2' 2-5/8"
(676)

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

MUA-PRC001-EN

Dimension and
Weights

Accessories

Table DW-13
Model
109-118
215-218
220-222
225-230

R/A/I.D.
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
SUBJECT TO MANUFACTURING
TOLERANCES.

Table DW-14
Model
109-112
115-118
215-218
220-222
225-230

A
3' 0"
(914)
3' 0"
(914)
3' 0"
(914)
4' 0"
(1219)
5' 0"
(1524)

B
3' 11-¼"
(1200)
3' 11-¼"
(1200)
7' 7-½"
(2324)
8' 5-5/8"
(2581)
10' 1-3/8"
(3083)

C
1' 5-7/16"
(443)
1' 10-7/8"
(581)
1' 10-7/8"
(581)
2' 7-¼"
(794)
3' 4-¾"
(1035)

D
1' 8-13/16"
(529)
2' 2-15/16"
(684)
5' 4-7/8"
(1648)
7' 0-½"
(2146)
8' 9-3/8"
(2677)

E
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
1' 10"
(559)
2' 4"
(711)

F
5' 1-¾"
(1568)
5' 1-¾"
(1568)
5' 1-¾"
(1568)
5' 5-¾"
(1670)
7' 2-1/8"
(2188)

G
2' 8-¼"
(819)
2' 8-¼"
(819)
2' 8-¼"
(819)
3' 8-¼"
(1124)
4' 8-¼"
(1429)

H
3' 7-1/8"
(1095)
3' 7-1/8"
(1095)
7' 3-3/8"
(2219)
8' 1-½"
(2477)
9' 9-¼"
(2978)

J
1' 9"
(533)
2' 0"
(610)
2' 0"
(610)
3' 9"
(1143)
3' 9"
(1143)

K
1' 11"
(584)
2' 2"
(660)
2' 2"
(660)
2' 7"
(787)
3' 4-¾"
(1035)

L
4' 4"
(1321)
4' 4"
(1321)
7' 10"
(2388)
10' 10"
(3302)
12' 10"
(3912)

M Filters [Qty] Size
4' 6" [9] 15x20x2"
(1372) ([9] 381x508x51)
4' 6" [9] 15x20x2"
(1372) ([9] 381x508x51)
4' 6" [18] 15x20x2"
(1372)([18] 381x508x51)
5' 0" [25] 20x20x2"
(1524)([25] 508x508x51)
5' 5" [36] 20x25x2"
(1651)([36] 508x635x51)

Note:
*Permanent filters are constructed of aluminum mesh.

MUA-PRC001-EN

31

Dimension and
Weights

Roof Curbs

Table DW-15
Model
109
112
115
118

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

B
1' 0-3/8"
(314)
10-13/16"
(275)
9-5/8"
(244)
9-5/8"
(244)

C
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

D
11-¾"
(298)
9-7/8"
(251)
8-3/8"
(213)
5-1/8"
(130)

E
1' 10-13/16"
(579)
1' 8-7/8"
(530)
1' 7-3/8"
(492)
1' 7-3/8"
(492)

Table DW-16
Model
215
218
220
222
225
230

A
B
C
1' 4"
9-5/8"
1' 6-15/16"
(406)
(244)
(481)
1' 7"
9-5/8"
1' 10-1/16"
(483)
(244)
(560)
2' 0-7/8" 10-7/16"
2' 1-1/16"
(632)
(265)
(637)
2' 3-3/8" 10-7/16"
2' 3-9/16"
(695)
(265)
(700)
2' 7-3/8" 1' 2-13/16" 2' 7-½"
(797)
(376)
(800)
3' 0-7/8" 1' 2-13/16"
3' 1"
(937)
(376)
(940)

D
5-1/8"
(130)
5-1/8"
(130)
9-5/8"
(244)
9-5/8"
(244)
1' 0-5/8"
(321)
1' 0-5/8"
(321)

E
1' 10-½"
(572)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

F
1' 11-3/8"
(594)
1' 11-3/8"
(594)
2' 11-½"
(902)
2' 11-½"
(902)
2' 11-½"
(902)
2' 11-½"
(902)

G
6' 3"
(1905)
6' 3"
(1905)
7' 10"
(2388)
7' 10"
(2388)
7' 10"
(2388)
7' 10"
(2388)

H
5' 11-½"
(1816)
5' 11-½"
(1816)
7' 6-½"
(2299)
7' 6-½"
(2299)
7' 6-½"
(2299)
7' 6-½"
(2299)

J
7' 8"
(2337)
7' 8"
(2337)
10' 8"
(3251)
10' 8"
(3251)
12' 8"
(3861)
12' 8"
(3861)

K
7' 4-½"
(2248)
7' 4-½"
(2248)
10' 4-½"
(3162)
10' 4-½"
(3162)
12' 4-½"
(3772)
12' 4-½"
(3772)

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

MUA-PRC001-EN

Dimension and
Weights

Roof Curbs for Units with Return
Air Opening Downstream of Burner

Table DW-17
Model
109

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

112
115
118

B
1' 0-3/8"
(314)
10-13/16"
(275)
9-5/8"
(244)
9-5/8"
(244)

C
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

D
11-¾"
(298)
9-7/8"
(251)
8-3/8"
(213)
5-1/8"
(130)

E
1' 10-13/16"
(579)
1' 8-7/8"
(530)
1' 7-3/8"
(492)
1' 7-3/8"
(492)

Table DW-18
Model
215
218
220
222
225
230

A
1' 4"
(406)
1' 7"
(483)
2' 0-7/8"
(632)
2' 3-3/8"
(695)
2' 7-3/8"
(797)
3' 0-7/8"
(937)

B
9-5/8"
(244)
9-5/8"
(244)
10-7/16"
(265)
10-7/16"
(265)
1' 2-13/16"
(376)
1' 2-13/16"
(376)

C
1' 6-15/16"
(481)
1' 10-1/16"
(560)
2' 1-1/16"
(637)
2' 3-9/16"
(700)
2' 7-½"
(800)
3' 1"
(940)

D
5-1/8"
(130)
5-1/8"
(130)
9-5/8"
(244)
9-5/8"
(244)
1' 0-5/8"
(321)
1' 0-5/8"
(321)

E
1' 10-½"
(572)
1' 4"
(406)
2' 5-½"
(749)
2' 0-5/8"
(625)
3' 1-5/8"
(956)
2' 2-5/8"
(676)

F
1' 11-3/8"
(594)
1' 11-3/8"
(594)
2' 11-½"
(902)
2' 11-½"
(902)
2' 11-½"
(902)
2' 11-½"
(902)

G
6' 3"
(1905)
6' 3"
(1905)
7' 10"
(2388)
7' 10"
(2388)
7' 10"
(2388)
7' 10"
(2388)

H
5' 11-½"
(1816)
5' 11-½"
(1816)
7' 6-½"
(2299)
7' 6-½"
(2299)
7' 6-½"
(2299)
7' 6-½"
(2299)

J
7' 8"
(2337)
7' 8"
(2337)
10' 8"
(3251)
10' 8"
(3251)
12' 8"
(3861)
12' 8"
(3861)

K
7' 4-½"
(2248)
7' 4-½"
(2248)
10' 4-½"
(3162)
10' 4-½"
(3162)
12' 4-½"
(3772)
12' 4-½"
(3772)

L
5' 5-¾"
(1670)
5' 5-¾"
(1670)
7' 3-3/8"
(2219)
7' 3-3/8"
(2219)
9' 3-3/8"
(2829)
9' 3-3/8"
(2829)

M
1' 4-¼"
(413)
1' 4-¼"
(413)
1' 4-¼"
(413)
1' 4-¼"
(413)
9-1/16"
(230)
9-1/16"
(230)

W
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 2-¼"
(362)
1' 8-¼"
(514)
1' 8-¼"
(514)

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.

MUA-PRC001-EN

33

Dimension and
Weights

Roof Curbs for Units with Mixing Box

Table DW-19
Model
109
112
115
118

A
10-3/8"
(264)
1' 1-9/16"
(344)
1' 4"
(406)
1' 7"
(483)

B
1' 0-3/8"
(314)
10-13/16"
(275)
9-5/8"
(244)
9-5/8"
(244)

C
11-15/16"
(303)
1' 3-15/16"
(405)
1' 6-15/16"
(481)
1' 10-1/16"
(560)

D
11-¾"
(298)
9-7/8"
(251)
8-3/8"
(213)
5-1/8"
(130)

E
1' 10-13/16"
(579)
1' 8-7/8"
(530)
1' 7-3/8"
(492)
1' 7-3/8"
(492)

Table DW-20
Model
215
218
220
222
225
230

A
B
C
D
1' 4" 9-5/8" 1' 6-15/16" 5-1/8"
(406) (244) (481) (130)
1' 7" 9-5/8" 1' 10-1/16" 5-1/8"
(483) (244) (560) (130)
2' 0-7/8" 10-7/16" 2' 1-1/16" 9-5/8"
(632) (265) (637) (244)
2' 3-3/8" 10-7/16" 2' 3-9/16" 9-5/8"
(695) (265) (700) (244)
2' 7-3/8" 1' 2-13/16" 2' 7-½" 1' 0-5/8"
(797) (376) (800) (321)
3' 0-7/8" 1' 2-13/16" 3' 1" 1' 0-5/8"
(937) (376) (940) (321)

E
F
G
H
1' 10-½" 1' 11-3/8" 10' 9" 10' 5-½"
(572) (594) (3277) (3188)
1' 4" 1' 11-3/8" 10' 9" 10' 5-½"
(406) (594) (3277) (3188)
2' 5-½" 2' 11-½" 12' 10" 12' 6-½"
(749) (902) (3912) (3823)
2' 0-5/8" 2' 11-½" 12' 10" 12' 6-½"
(625) (902) (3912) (3823)
3' 1-5/8" 2' 11-½" 13' 4" 13'-½"
(956) (902) (4064) (3950)
2' 2-5/8" 2' 11-½" 13' 4" 13'-½"
(676) (902) (4064) (3950)

J
K
L
7' 8" 7' 4-½" 1' 8-¼"
(2337) (2248) (514)
7' 8" 7' 4-½" 1' 8-¼"
(2337) (2248) (514)
10' 8" 10' 4-½" 1' 8-¼"
(3251) (3162) (514)
10' 8" 10' 4-½" 1' 8-¼"
(3251) (3162) (514)
12' 8" 12' 4-½" 2' 2-½"
(3861) (3772) (673)
12' 8" 12' 4-½" 2' 2-½"
(3861) (3772) (673)

M
7' 0"
(2134)
7' 0"
(2134)
10' 0"
(3048)
10' 0"
(3048)
12' 0"
(3658)
12' 0"
(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

MUA-PRC001-EN

Dimension and
Weights

Approximate Weights

Table W-1 — Outdoor Unit Weights in Pounds (Approximate)*
Unit
Size
109
112
115
118
215
218
220
222
225
230

Basic
Horizontal
Unit
760
760
760
820
1180
1300
2280
2370
2990
3130

Basic
Vertical
Unit
1010
1010
1010
1060
1650
1770
3270
3360
4250
4390

Inlet
Hood
140
140
140
140
210
210
275
275
365
365

Inlet
Damper
60
60
60
60
160
160
210
210
320
320

V-Bank
Filter
125
125
125
125
200
200
250
250
330
330

Mixing
Box
320
320
320
320
586
586
730
730
1006
1006

Discharge
Damper
45
45
45
45
80
80
145
145
190
190

Discharge
Louver
70
70
70
70
150
150
215
215
230
230

A
215
215
215
225
342
378
625
675
824
863

B
215
215
215
225
342
378
625
675
824
863

C
185
185
185
200
274
311
555
545
732
731

D
145
145
145
160
222
233
475
475
610
673

Note:
*Contact factory for shipping weight on models exceeding 50,000 CFM.

Table W-2 — Roof Curb Weights in Pounds
Description
Roof Curb for Basic Frame—No Return Air
Roof Curb for Basic Frame—With Return Air Downstream of Burner
Roof Curb for Basic Frame—With Mixing Box Option

MUA-PRC001-EN

109
150
150
215

112
150
150
215

115
150
150
215

118
150
150
215

215
200
200
270

Unit Size
218
200
200
270

220
270
270
340

222
270
270
340

225
300
300
375

230
300
300
375

35

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 DUE TO 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 rustresistant 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.

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.
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.
Fans
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 heavyduty, industrial prelubricated type.
Bearing life is 100,000 hours.
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

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.
Units shall be supplied with a widerange 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.
Control Enclosure
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.

The unit shall also contain a main fan
starter and overloads, control circuit
fuses, and vents for outdoor units.
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 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
manual auxiliary gas shutoff valve, and
an auxiliary gas valve. (Optional)
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
manual auxiliary gas shutoff valve, a
normally open vent valve, and an
auxiliary gas valve. (Optional)

MUA-PRC001-EN

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.
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.

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 cannot be used with a
two speed fan motor.

Note:This option can be used with
either the Motorized Inlet Damper
option or the Motorized Outlet Damper
option.
Option Includes:
• 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.
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.
MUA-PRC001-EN

Code requires that outside ventilation air
be provided to the space in the amount
of 4 cfm per 1 MBh of burner rated input.
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.

Note:This option cannot be used with a
two speed fan motor.

Note:This option can be used with
either the Motorized Inlet Damper
option or the Motorized Outlet Damper
option.
Option Includes:
• Return air damper
• Burner profile damper
• Linkage
• Modulating damper motor(s)
• Photohelic differential pressure gauge

37

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 Vbank 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
modulates to a more closed position.

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.
The desired temperature at the
temperature sensor is set at the control
cabinet at the unit.

Option Includes:
• Mixing box with V-bank filter and
permanent filters
• Dampers
• Modulating damper motor(s)
•Temperature sensor

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.

38

MUA-PRC001-EN

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.
The desired pressure differential is set at
the photohelic.

Option Includes:
• Mixing box with V-bank filter and
permanent filters
• Dampers
• 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 builtin end switch and spring return
• Linkage

MUA-PRC001-EN

39

Options

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.

Option Includes:
• Damper
•Two position damper motor with builtin end switch and spring return
• Linkage

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
The unit SCFM is less than the Maximum
SCFM given below.
2
The unit input is less than the Maximum
Input BTUH given below.
3
The static pressure is in the range given
below.
4
Unit discharge temperature is 75 F
maximum.
5
The ambient temperature is minus 40 F
or greater.
6
The unit has a maximum temperature
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.
8
The fuel is natural gas.
9
The motor is a single speed motor.
10
Unit components are standard (there are
exceptions to this).
Model
No.
DFOA 109
DFOA 112
DFOA 115
DFOA 118
DFOA 215
DFOA 218
DFOA 220
DFOA 222
DFOA 225
DFOA 230

40

Static
(in W.C.)
0-4.0
0-4.0
0-4.0
0-4.0
0-4.0
0-4.0
0-4.0
0-4.0
0-4.0
0-3.5

Max.
SCFM
3,000
4,250
6,000
8,500
12,000
17,000
26,000
31,000
46,000
64,000

Max. Input.
(BTUH)
325,500
461,125
851,000
922,250
1,302,000
1,844,500
2,821,000
3,363,500
4,991,000
6,944,000

ETL Labeling Requirements

ETL Labeling Requirements

A DFOA unit with a mixing box,
motorized RA damper, or motorized
75/25 damper can bear the ETL label if:
1
The unit SCFM is less than the
Maximum SCFM given below.
2
The unit input is less than the Maximum
BTUH rating given below.
3
The unit temperature rise is less than the
MaximumTemperature Rise given
below.
4
The fuel is natural gas.
5
The motor is a single speed motor.
6
Unit components are standard (there are
exceptions to this).

A DFOA unit with no mixing box,
motorized RA damper, or motorized
75/25 damper can bear the ETL label if:
1
The unit SCFM is less than the
Maximum SCFM given below.
2
The unit input is less than the Maximum
BTUH rating given below.
3
The unit temperature rise is less than the
MaximumTemperature Rise given
below.
4
The fuel is natural gas.
5
The motor is a single speed motor.
6
Unit components are standard (there are
exceptions to this).

Model
No.
DFOA 109
DFOA 112
DFOA 115
DFOA 118
DFOA 215
DFOA 218
DFOA 220
DFOA 222
DFOA 225
DFOA 230

Model
No.
DFOA 109
DFOA 112
DFOA 115
DFOA 118
DFOA 215
DFOA 218
DFOA 220
DFOA 222
DFOA 225
DFOA 230

Max.
SCFM
3,000
4,250
6,000
8,500
12,000
18,000
26,000
31,000
46,000
64,000

Max.
BTUH
291,262
412,621
582,524
680,000
1,349,831
1,800,000
2,924,634
3,100,000
5,174,353
6,400,000

Max. Temp.
Rise
100 F
100 F
100 F
100 F
100 F
100 F
100 F
100 F
100 F
100 F

Max.
SCFM
3,000
4,250
6,000
8,500
12,000
18,000
26,000
31,000
46,000
64,000

Max.
BTUH
424,565
601,290
848,880
1,202,580
1,697,760
2,546,640
3,678,480
4,385,880
6,508,080
9,054,720

Max. Temp.
Rise
120 F
120 F
120 F
120 F
120 F
120 F
120 F
120 F
120 F
120 F

These requirements were current when this catalog was
printed.
Please contact Technical Support for the most current
data available.

MUA-PRC001-EN

Options

Exhaust Interlock
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.

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.”

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.

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.”
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.
Seven Day Timeclock/
Night Setback Thermostat
The seven day timeclock is used
primarily for either one of the following:
1
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.
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.

MUA-PRC001-EN

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.
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.”
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.
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.

Optional Gas Controls
Series 14 — Constant Discharge
Temperature
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.
Series 44 — Space Temperature Control
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
Selectrastat mounted in the area where
the temperature is to be sensed.

The unit has to be reset by pushing the
reset button on the burner relay.
Differences between UV Flame Sensor
and Flame Rod:
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.

41

Options

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.
Open Drip-Proof Motor
60 Hz/1800 Rpm

Two-Speed/One Winding Motors
60 Hz/1800/900 Rpm
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.

Single Phase
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.

Two-Speed/Two Winding Motors
60 Hz/1800/1200 Rpm

Three-Phase
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.

Additional Options*

Energy Efficient ODP
60 Hz/1800 Rpm

V-Bank Filter Section
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.
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.
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.

42

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.
Inlet Hood and Birdscreen
Hood constructed of 18-gauge
galvanized steel. Birdscreen is 18-gauge
galvanized steel with one-inch square
openings.

Dampers and Mixing Box
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 twoposition damper motor, linkage and
damper switch. It is not available with
two-speed motors.

Mixing Box — Building Pressure Control
This option provides a way for
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).
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
potentiometer.
Inlet/Outlet Dampers
Motorized Inlet Damper
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.
Motorized Outlet Damper
This option provides a shutoff damper.
This option includes a discharge damper,
two-position damper motor with a builtin end switch, and linkage.

*Based on unit design, some options
can ship factory installed or field
installed. Contact the factory for
verification.

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.
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.
MUA-PRC001-EN

Accessories

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.
5-10 Psig
An additional regulator is furnished. Inlet
pressure at the job must be specified.
Insulation
One-inch, 1½ lb. fiberglass insulation pin
spotted to casing.
Insulation on Basic Frame
Insulation on Filter Section
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.
Extended Grease Lines
This option allows lubrication of fan
bearings from the control side of the unit.
Controls Opposite from Standard
Inlet On-Off Duct Stat
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.
115V Duplex Receptacle
This option includes a transformer and
disconnect switch for the receptacle.
Components are mounted in the gas
piping manifold.

Circuit Analyzer
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.

Field Installed Accessories

UV Flame Sensor
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.

100 DBL Alarm Horn and Silencing
Switch
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.

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.
Exhaust Fan Interlock
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).
Interlocking Relay
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).
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.

Vibration Feet
Rubber-in-shear vibration isolators
cannot be ordered with a roof curb —
they ship unmounted.
Vibration Feet — Basic Frame
Vibration Feet — Filter Section
Vibration Feet — Mixing Box
Seven-Day Time Clock
This option includes a Paragon sevenday general purpose time control with a
four-pole switch.

Remote Control Station
Option includes fan and heat switches,
burner on light, alarm light, and Maxitrol
Selector or Selectrastat.
On-Off Night Setback Thermostat
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.
High Gas Pressure Regulator —
Over 10 Psig
Specify inlet pressure at the jobsite.This
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.
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

The Trane Company
An American Standard Company
www.trane.com
For more information contact your local
district office, or e-mail us at
comfort@trane.com

Literature Order Number

MUA-PRC001-EN

File Number

PL-UN-MUA-DFOA-PRC001-9-00

Supersedes

MUA-D-2 12/97

Stocking Location

Inland - LaCrosse

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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Title                           : Make-Up Air Units Direct-Fired Outdoor Model DFOA PDF Catalog MUA-PRC001-EN
Subject                         : Make-Up Air Units Direct-Fired Outdoor Model DFOA
Author                          : Commercial Order Acquisition
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