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Large Unit Heater
13
Operating Instructions and Owner’s Manual
HIGH ALTITUDE OPERATION
WARNING
Explosion hazard. This heater must be converted by a trained gas installation and service personnel only. Failure to
comply could result in personal injury, asphyxiation, death, and fire or property damage.
This Unit heater is factory configured for altitudes from 0 – 2,000 ft above sea level. Above 2000 ft. (610m), manifold pressure must be adjusted
according to the following tables:
In case the manifold pressure is changed for this reason, the altitude label in the conversion kit must be completed and affixed to the unit:
TABLE 7: Natural Gas Heating Values at Altitude
TABLE 8: Propane Gas Heating Values at Altitude
Model
Altitude 0-2000 ft. (0-610m) Altitude 2000-3000 ft. (610-910mm)
Manifold Pressure Input Rating Manifold Pressure Input Rating
[“ W.C.] [kPa] [BTU/Hr] [W] [“ W.C.] [kPa] [BTU/Hr] [W]
MHU200NG
4.5 1.12 200,000 58,614 4.15 1.03 192,000 56,269
MHU250NG
4.9 1.22 250,000 73,268 4.52 1.12 240,000 70,337
MHU300NG
1.73 0.43 300,000 87,921 1.59 0.40 288,000 84,404
MHU400NG
2.13 0.53 400,000 117,228 1.96 0.49 384,000 112,539
Model
Altitude 0-2000 ft. (0-610m) Altitude 2000-3000 ft. (610-910mm)
Manifold Pressure Input Rating Manifold Pressure Input Rating
[“ W.C.] [kPa] [BTU/Hr] [W] [“ W.C.] [kPa] [BTU/Hr] [W]
MHU200NG
7.23 1.8 200,000 58,614 6.66 1.66 192,000 56,269
MHU250NG
7.23 1.8 250,000 73,268 6.66 1.66 240,000 70,337
MHU300NG
3.81 0.95 300,000 87,921 3.51 0.88 288,000 84,404
MHU400NG
4.74 1.18 400,000 117,228 4.37 1.09 384,000 112,539
Model
Altitude 3000-4000 ft. (910-1220m) Altitude 4000-4500 ft. (1220-1350mm)
Manifold Pressure Input Rating Manifold Pressure Input Rating
[“ W.C.] [kPa] [BTU/Hr] [W] [“ W.C.] [kPa] [BTU/Hr] [W]
MHU200NG
3.81 0.95 184,000 53,925 3.65 0.91 180,000 52,753
MHU250NG
4.15 1.03 230,000 67,407 3.97 0.99 225,000 65,941
MHU300NG
1.46 0.36 276,000 80,887 1.40 0.35 270,000 79,129
MHU400NG
1.80 0.45 368,000 107,850 1.73 0.43 360,000 105,505
Model
Altitude 3000-4000 ft. (910-1220m) Altitude 4000-4500 ft. (1220-1350mm)
Manifold Pressure Input Rating Manifold Pressure Input Rating
[“ W.C.] [kPa] [BTU/Hr] [W] [“ W.C.] [kPa] [BTU/Hr] [W]
MHU200NG
6.12 1.52 184,000 53,925 5.86 1.46 180,000 52,753
MHU250NG
6.12 1.52 230,000 67,407 5.86 1.46 225,000 65,941
MHU300NG
3.22 0.80 276,000 80,887 3.09 0.77 270,000 79,129
MHU400NG
4.01 1.00 368,000 107,850 3.84 0.96 360,000 105,505
This appliance was converted on ______ (day-month-year)
for operation at ____ ft.(___m) altitude by ____________
(name and address of the organization making this conver-
sion) which accepts the responsiblity that this conversion
has been properly made.
Manifold pressure adjustment____W.C. Input rating____
Btu/hr
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