Lennox G40UHX Series, Unit Information

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Page 13
FILTER AIR RESITANCE
cfm (L/s) in. w.g. (Pa)
0 (0) 0.00 (0)
200 (95) 0.01 (0)
400 (190) 0.03 (5)
600 (285) 0.04 (10)
800 (380) 0.06 (15)
1000 (470) 0.09 (20)
1200 (565) 0.12 (30)
1400 (660) 0.15 (35)
1600 (755) 0.19 (45)
1800 (850) 0.23 (55)
2000 (945) 0.27 (65)
2200 (1040) 0.33 (80)
2400 (1130) 0.38 (95)
2600 (1225) 0.44 (110)
HIGH ALTITUDE
All −1 to −14
models − Pressure regulator adjustment may be
required depending on altitude. See below for proper pressure
regulator setting.
Manifold Pressure (Outlet) in. w.g. (kPa)
ALTITUDE ft. (m)
FUEL
0−4500
(0−1372)
4501−5500
(1373−1676)
5501−6500
(1677−1981)
6501−7500
(1982−2286)
Natural Gas 3.5 (.87) 3.3 (.82) 3.2 (.80) 3.1 (.77)
LPG/Propane 10.0 (2.49)
All −15 and later models
− Pressure regulator adjustment is
not rquired. See below for proper pressure regulator setting.
Manifold Pressure (Outlet) in. w.g. (kPa)
FUEL
ALTITUDE ft. (m)
FUEL
0 − 10,000 (0 − 3048)
Natural Gas 3.5 (.87)
LPG/Propane 10.0 (2.49)
HIGH ALTITUDE
G40UH−1
1
High Altitude
Orifice Kit
Natural Gas Only
High Altitude Prove
Switch Kit
LPG/Propane Kit
G40UH−1
to −14
Natural Gas Only
4501−7500 ft.
(1373− 2236m)
7501−10,000 ft.
(2287 − 3048m)
0−7500 ft.
(0 − 2286m)
7501−10,000 ft.
(2286 − 3048m)
−045−
−070 47M82 56L32 56L32 45L60 47M81
−090 47M82 49L90 15M22 45L60 47M81
−110 47M82 49L90 15M22 45L60 47M81
−135 47M82 49L90 15M22 45L60 47M81
−155 47M82 49L90 15M22 45L60 47M81
G40UH−15
1
High Altitude
Orifice Kit
Natural Gas Only
High Altitude Pressure
Switch Kit
LPG/Propane Kit
G40UH−15
and later
Natural Gas Only
4501−7500 ft.
(1373 − 2286m)
7501−10,000 ft.
(2287 − 3048m)
0−7500 ft.
(0 − 2286m)
7501−10,000 ft.
(2286 − 3048m)
all models 59M17 NO CHANGE 56L32 25W20 25W21
1
Required for proper operation at altitudes from 7501 to 10,000 ft.