Make-Up
Air Units
Dir ect-Fired Outdoor
Model DFO A
September 2000
MU A-PR C001 -EN
Introduction
Why Use Trane Make-Up Air Units?
To help relieve negative pressure inside
commercial and industrial facilities, such
as factories, garages, pac king 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 of fer
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.
All standard units include the necessary
controls for operation, such as a flame
safeguard, an air proving differential
switch, a high temperature limit switc h,
and an ignition transformer. Component
parts are of the highest quality . Eac h unit
has overlapping, fail-safe protection
devices to handle failures should they
occur. Eac h 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.
©American Standard Inc. 2000
MUA-PRC001-EN
Contents
Introduction
Featur es and Benefits
Unit Configurations
Application Considerations
Model Number Description
P erformance Data
Gas Piping
Controls
Electric P o wer
Dimension and Weights
Mechanical Specifications
Options
Accessories
2
4
6
7
8
9
11
16
18
19
36
37
43
MUA-PRC001-EN
3
À
Supply air intake view showing inlet hood
and birdscreen
Features and Benefits
Á
Gas burner section
Â
Optional inlet damper wtih V-bank filter
Ã
Factory assembled g as manifold
compartment
Ä
Access compartment t o contr ol panel and
fan motor.
Note: Fan motor panel has been removed for photograph.
MUA-PRC001-EN4
Features and
Benefits
Basic Unit
Feature:
Casing with galvanized finish
Benefit:
Rust problem is greatly reduced
Feature:
Water tight 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
Gas-Fired Unit
Feature:
Many standard, natural gas burning
units bear the ETL label. Contact
factory for verification.
Benefit:
Meets certain insurance requirements
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 backdraf t and dangerous
contaminants from entering the space
5MUA-PRC001-EN
Horiz ontal Configurations
For all arrangements shown, the g as
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.
Unit Configurations
V er tical Configurations
For all arrangements shown, the g as
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.
MUA-PRC001-EN6
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 of fer the
advantage of a full support system that
is watertight, pro vides 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
backdraf t 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.
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: Select ed hor iz ontal and ver tical
units are av ailable with special coil
options (DX, chilled w at er, st eam or
electric).
7MUA-PRC001-EN
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 1 1 — Gas Control Option
A = Series 14 Constant Disc harge
Temperature
B = Series 44 Space T emperature Control
S = Special
Digit 12 — Type Gas Tr ain Approv als
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 = 1 100 MBh Input
Model Number Description
D F O A 1 0 9 A N C A 1 A A B 1 2 0 0 0 A
1,2,3 4 5,6,7 8 9 10 11 12 13,14 15 16 17 18 19 20 21
AF = 1375 MBh Input
AG = 1650 MBh Input
AH = 1925 MBh Input
AJ = 2200 MBh Input
AK = 2475 MBh Input
AL = 2750 MBh Input
AN = 3025 MBh Input
AP = 3300 MBh Input
AQ = 3575 MBh Input
AR = 3850 MBh Input
AT = 4125 MBh Input
AV = 4400 MBh Input
AW = 4675 MBh Input
AX = 4950 MBh Input
A Y = 5225 MBh Input
AZ = 5500 MBh Input
A1 = 5775 MBh Input
A2 = 6050 MBh Input
A3 = 6325 MBh Input
A4 = 6600 MBh Input
A5 = 6875 MBh Input
A6 = 7150 MBh Input
A7 = 7425 MBh Input
A8 = 7700 MBh Input
A9 = 7975 MBh Input
SS = Special
Digit 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 Dischar ge*
Horizontal Ar rangement
1 = Arrangement 1, T op
2 = Arrangement 2, Side
3 = Ar rangement 3, Bottom
*Select arrangements from page 6.
V ertical Arrang ement
4 = Arrangement 4, Side
5 = Arrangement 5, T op
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 Filt er 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 = 1 15V Duplex Service Receptacle with
Power Transformer
L = Circuit Analyzer
M = Painted Basic Unit and Accessories
N = UV Flame Sensor
P = Clogged Filter Switc h 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 5-1 0 PSIG
Y = Adjustable Drive
S = Special
8 = Low Gas Pressure Burner
MUA-PRC001-EN8
P erformance Data
Table PD-1 — Direct-Fir ed Outdoor Unit
Models Blower STD Air Outlet ¼” 3/8” ½” ¾” 1” 1 ¼” 1 ½” 2”
DFO Size @ 70 Velocity HP
109 1-9” 2250 2690 1 ½ 1 ½ 1 ½ 22223
112 1-12” 3750 2540 2 2 3 33335
115 1-15” 5000 2430 3 3 3 33555
118 1-18” 7500 2565 5 5 5 5 5 7 ½ 7 ½ 7 ½
215 2-15” 1 0500 2550 5 5 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ —
218 2-18” 14000 2390 7 ½ 7 ½ 7 ½ 10 10 10 15 —
220 2-20” 22000 2620 15 15 1 5 15 15 20 20 20
222 2-22” 28000 2750 15 20 20 20 20 25 25 30
225 2-25” 38000 2835 20 20 20 25 25 30 30 40
230 2-30” 56000 3020 30 30 30 40 40 40 40 50
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
CFM FPM T otal External Static Pressure (WC)
1600 1915 ¾11 1 ————
1800 2155 1 1 1 1 ½ 1 ½ 1 ½ — —
2000 2390 1 ½ 1 1½ 1 ½ 1 ½ 2 2 —
2500 2990 2 2 2 22333
2750 3290 2 2 2 33333
3000 3585 3 3 3 33355
3250 2180 1 ½ 2 2 23333
3500 2360 2 2 2 33335
4000 2720 3 3 3 33355
4250 2900 3 3 3 33555
45002190 223 3335—
5500 2670 3 3 3 55555
60002910 555 55557 ½
65002215 355 55557 ½
7000 2390 5 5 5 5557 ½7 ½
8000 2740 5 5 5 7 ½ 7 ½ 7 ½ 7 ½ 7 ½
8500 2915 5 5 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ 10
9000 2190 5 5 5 5 7 ½ — — —
9500 2310 5 5 5 5 7 ½ 7 ½ — —
10000 2430 5 5 5 7 ½ 7 ½ 7 ½ 7 ½ —
11000 2670 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ 10 10
11500 2790 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ 10 10 10
12000 2910 7 ½7 ½7 ½7 ½10101015
12500 2125 7 ½ 7 ½ 7 ½ 7 ½ 7 ½ — — —
13000 2215 7 ½ 7 ½ 7 ½ 7 ½ 10 10 — —
15000 2565 7 ½ 10 10 10 10 15 15 15
16000 2740 101010 1015151515
17000 2915 101010 1515151520
18000 2140 7 ½1010 10151515—
19000 2260 10 10 10 10 15 15 15 —
20000 2380 10 10 10 15 15 15 15 20
21000 2500 101515 1515152020
23000 2740 15 15 15 15 15 20 20 20
24000 2860 15 15 15 1 5 20 20 20 25
25000 2980 15 15 15 20 20 20 20 25
26000 3100 15 20 20 20 20 20 25 25
25000 2450 15 15 15 1 5 20 20 20 25
26000 2550 15 15 15 20 20 20 20 25
27000 2650 15 15 15 20 20 20 20 25
29000 2850 20 20 20 20 25 25 25 30
30000 2950 20 20 20 20 25 25 25 30
31000 3050 20 20 20 25 25 25 30 30
30000 2235 15 15 15 15 20 20 — —
32000 2385 15 15 15 20 20 20 25 —
34000 2535 15 20 20 20 20 25 25 30
36000 2685 20 20 20 20 25 25 30 30
40000 2985 20 25 25 25 30 30 30 40
42000 3135 25 25 25 30 30 40 40 40
44000 3285 25 30 30 30 40 40 40 40
46000 3430 30 30 30 40 40 40 40 50
44000 2365 20 20 20 25 25 30 — —
48000 2580 20 25 25 25 30 30 40 —
52000 2800 252530 3040404050
60000 3240 40 40 40 40 40 50 50 50
64000 3440 40 40 40 50 50 50 50 60
9MUA-PRC001-EN
P erformance
Data
Table PD-2 — Direct-Fir ed Outdoor Unit — Bur ner Selection (MBh Input)
Models Std Air 70 F 80 F 90 F 1 00 F 110 F 120 F
DFO 70 F Rise Rise Rise Rise Rise Rise
109 2250 185 211 238 264 291 317
112 4000 329 376 423 470 517 563
115 5500 452 517 581 646 710 775
118 8000 657 751 845 939 1033 1127
215 10500 863 986 1 1 09 1233 1356 1479
218 15000 1233 1409 1585 1761 1937 2113
220 22000 1808 2066 2324 2583 2841 3099
222 29000 2383 2723 3064 3404 3745 4085
225 40000 3287 3757 4226 4696 5165 5635
230 56000 4602 5259 5917 6574 7231 —
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
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.
CFM
1600 131 150 169 188 207 225
1800 148 169 190 211 232 254
2000 164 188 211 235 258 282
2500 205 235 264 293 323 352
2750 226 258 291 323 355 387
3000 247 282 317 352 387 423
3250 267 305 343 382 420 458
3500 288 329 370 41 1 452 493
3750 308 352 396 440 484 528
4250 349 399 449 499 549 599
4500 370 423 475 528 581 634
5000 411 470 528 587 646 704
6000 493 563 634 704 775 845
6500 534 610 687 763 839 916
7000 575 657 740 822 904 986
7500 616 704 792 880 968 1057
8500 698 798 898 998 1 098 1197
9000 740 845 951 1057 1 1 62 1268
9500 781 892 1004 11 15 1227 1338
10000 822 939 1 057 1174 1291 1409
11000 904 1033 1162 1291 1420 1550
11500 945 1 080 1215 1350 1485 1620
12000 986 1127 1268 1409 1550 1690
12500 1027 1174 1321 1467 161 4 1761
13000 1068 1221 1373 1526 1679 1831
14000 1150 1 315 1479 1643 1808 1972
16000 1315 1503 1690 1878 2066 2254
17000 1397 1597 1796 1996 21 95 2395
18000 1479 1690 1902 2113 2324 2536
19000 1561 1784 2007 2230 2453 2677
20000 1643 1878 2113 2348 2583 2817
21000 1726 1972 2219 2465 2712 2958
23000 1890 2160 2430 2700 2970 3240
24000 1972 2254 2536 2817 3099 3381
25000 2054 2348 2641 2935 3228 3522
26000 2137 2442 2747 3052 3357 3663
25000 2054 2348 2641 2935 3228 3522
26000 2137 2442 2747 3052 3357 3663
27000 2219 2536 2853 3170 3487 3803
28000 2301 2630 2958 3287 3616 3944
30000 2465 2817 3170 3522 3874 4226
31000 2547 2911 3275 3639 4003 4367
30000 2465 2817 3170 3522 3874 4226
32000 2630 3005 3381 3757 4132 4508
34000 2794 3193 3592 3991 4390 4790
36000 2958 3381 3803 4226 4649 5071
38000 3123 3569 4015 4461 4907 5353
42000 3451 3944 4437 4930 5423 5917
44000 3616 4132 4649 5165 5682 6198
46000 3780 4320 4860 5400 5940 6480
44000 3616 4132 4649 5165 5682 6198
48000 3944 4508 5071 5635 6198 6762
52000 4273 4883 5494 6104 6715 7325
60000 4930 5635 6339 7043 7748 —
64000 5259 601 0 6762 7513 — —
.92
MUA-PRC001-EN10
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-0 1 Pilot Gas V alve
VG-02 Main Gas Valve
VG-03 Auxiliary Gas Valve
VG-04 N/O Vent V alve
VG-07 Maxitrol Modulating Valve
PS-04 Low Gas Pressure Switch
PS-07 High Gas Pressure Switch
Notes:
1
V ents 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 1 0” 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.
11MUA-PRC001 -EN
Gas
Piping
Table GP-1— Gas Pr essur e Regulator Selection
If Burner Size (BS) Is: And Gas Pressure (GP) Is: Then:
BS < 825 GP< 7” WC 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 < GP
50 PSI < GP Call factory to verify availability and pricing
990 < BS < 4125 GP < 7” W C Call factory to verify availability and pricing
7” WC
10” WC < GP < 5 PSI No low gas pressure burner or high gas pressure regulator required
5 PSI < GP
10 PSI < GP
50 PSI < GP Call factory to verify availability and pricing
4400 < BS < 7975 GP < 1 PSI Call factory to verify availability and pricing
1 PSI
5 PSI < GP < 10 PSI Use high gas pressure regulator 5-10 PSI
10 PSI < GP
50 PSI < GP Call factory to verify availability and pricing
< 10 PSI Use high gas pressure regulator 5-10 PSI
< 50 PSI Use high gas pressure regulator over 10 PSI
< GP < 10” WC Use low gas pressure burner
< 10 PSI Use high gas pressure regulator 5-10 PSI
< 50 PSI Use high gas pressure regulator over 10 PSI
< GP < 5 PSI No low gas pressure burner or high gas pressure regulator required
< 50 PSI Use high gas pressure regulator over 10 PSI
MUA-PRC001-EN12
Gas
Piping
Table GP-2 — Gas Pipe Connection Siz e — Dir ect-Fired Units — IRI Gas T rain — R/A Meeting ETL
MBH 6-7" 8-11" 12-14" 15-20" 21-27" 1 psi 2 psi 3 psi 4 psi 5 psi
275 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
550 1 ¼" 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
825 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,100 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼“ 1 ¼” 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,375 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,650 N/A 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,925 N/A 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,200 N/A 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,475 2 ½" 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,750 3" 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,025 3" 2 ½" 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,300 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
3,575 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
3,850 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,125 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,400 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,675 N/A 3" 2 ½" 2" 2" 2" 2" 2" 2" 2"
4,950 N/A 3" 2 ½" 2" 2" 2" 2" 2" 2" 2"
5,225 N/A 3" 2 ½" 2" 2" 2" 2" 2" 2" 2"
5,500 N/A 3" 2 ½" 2 ½" 2" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
5,775 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,050 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,325 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,600 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,875 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,150 N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,700 N/A N/A 3" 2 ½" 2 ½" 3" 3" 3" 3" 3"
8,250 N/A N/A 3" 3" 2 ½" 3" 3" 3" 3" 3"
8,800 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
9,350 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
9,900 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
10,450 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,000 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,550 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)
Table GP-3 — Gas Pipe Connection Siz e — Dir ect-Fired Units — FM Gas T r ain — R/A Meeting ETL
Inlet Gas Pressure (inches of water column)
MBH 6-7" 8-11" 12-14" 15-20" 21-27" 1 psi 2 psi 3 psi 4 psi 5 psi
275 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
550 1 ¼" 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
825 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,100 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,375 2" 1 ½" 1 ½" 1 ½" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,650 2" 1 ½" 1 ¼" 1¼" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,925 2" 2" 1 ¼" 1¼" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,200 N/A 2" 1 ½" 1¼" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,475 N/A 2" 1 ½" 1¼" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,750 N/A 2" 2" 1 ½" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,025 N/A 2" 2" 1 ½" 1¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,300 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
3,575 N/A 3" 2" 2" 2" 2" 2" 2" 2" 2"
3,850 N/A 3" 2" 2" 2" 2" 2" 2" 2" 2"
4,125 N/A 3" 2" 2" 2" 2" 2" 2" 2" 2"
4,400 N/A 3" 2" 2" 2" 2" 2" 2" 2" 2"
4,675 N/A 3" 2" 2" 2" 2" 2" 2" 2" 2"
4,950 N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
5,225 N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
5,500 N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
5,775 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,050 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,325 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,600 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,875 N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,150 N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,700 N/A N/A 3" 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
8,250 N/A N/A 3" 3" 3" 3" 3" 3" 3" 3"
8,800 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
9,350 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
9,900 N/A N/A N/A 3" 3" 3" 3" 3" 3" 3"
10,450 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,000 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,550 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
13MUA-PRC001 -EN
Gas
Piping
Table GP-4 — Gas Pipe Connection Siz e — Direct-Fir ed Units — Standar d Gas Tr ain — R/A Meeting ETL
MBH 6-7" 8-11" 12-14" 15-20" 21-27" 1 psi 2 psi 3 psi 4 psi 5 psi
275 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
550 1 ¼" 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
825 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,100 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,375 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,650 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,925 2 ½" 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,200 2 ½" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,475 2 ½" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,750 2 ½" 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,025 2 ½" 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,300 2 ½" 2" 2" 2" 2" 2" 2" 2" 2" 2"
3,575 3" 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
3,850 3" 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,125 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,400 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,675 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
4,950 N/A 2 ½" 2" 2" 2" 2" 2" 2" 2" 2"
5,225 N/A 2 ½" 2 ½" 2" 2" 2" 2" 2" 2" 2"
5,500 N/A 2 ½" 2 ½" 2" 2" 2" 2" 2" 2" 2"
5,775 N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,050 N/A 3 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,325 N/A 3 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,600 N/A 3 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,875 N/A 3 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,150 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,700 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
8,250 N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
8,800 N/A N/A 3 3 3 3 3 3 3 3
9,350 N/A N/A 3 3 3 3 3 3 3 3
9,900 N/A N/A 3 3 3 3 3 3 3 3
10,450 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,000 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,550 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)
Table GP-5 — Gas Pipe Connection Siz e — Direct-Fir ed Units — IRI Gas T rain — 100% OA or R/A Not ETL
MBH 6-7" 8-11" 12-14" 15-20" 21-27" 1 psi 2 psi 3 psi 4 psi 5 psi
275 1 ¼" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
550 N/A 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
825 N/A N/A 1" ¾" ¾" ¾" ¾" ¾" ¾" ¾"
1,100 N/A 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,375 N/A 2" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,650 N/A N/A 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
1,925 N/A N/A 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,200 N/A N/A 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,475 N/A N/A 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
2,750 N/A N/A 2" 2" 1 ½" 1 ¼" 1 ¼" 1 ¼" 1 ¼" 1 ¼"
3,025 N/A N/A 2" 2" 2" 2" 2" 2" 2" 2"
3,300 N/A N/A 2" 2" 2" 2" 2" 2" 2" 2"
3,575 N/A N/A 2 ½" 2" 2" 2" 2" 2" 2" 2"
3,850 N/A N/A 2 ½" 2" 2" 2" 2" 2" 2" 2"
4,125 N/A N/A 2 ½" 2" 2" 2" 2" 2" 2" 2"
4,400 N/A N/A 2 ½" 2 ½" 2" 2" 2" 2" 2" 2"
4,675 N/A N/A 2 ½" 2 ½" 2" 2" 2" 2" 2" 2"
4,950 N/A N/A 2 ½" 2 ½" 2" 2" 2" 2" 2" 2"
5,225 N/A N/A 3" 2 ½" 2" 2" 2" 2" 2" 2"
5,500 N/A N/A 3" 2 ½" 2 ½" 2" 2" 2" 2" 2"
5,775 N/A N/A 3" 2 ½" 2 ½" 2" 2" 2" 2" 2"
6,050 N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,325 N/A N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,600 N/A N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
6,875 N/A N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,150 N/A N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
7,700 N/A N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
8,250 N/A N/A N/A N/A 2 ½" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
8,800 N/A N/A N/A N/A 3" 2 ½" 2 ½" 2 ½" 2 ½" 2 ½"
9,350 N/A N/A N/A N/A 3" 3" 3" 3" 3" 3"
9,900 N/A N/A N/A N/A 3" 3" 3" 3" 3" 3"
10,450 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,000 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
11,550 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
12,100 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)
MUA-PRC001-EN14