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NOTE: For model 90-75 LP units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifice Kit
#550001810*. For all other altitudes use factory installed orifice.
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
* For model 90-75 LP units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifice Kit #550001810. For all other alti-
tudes use factory installed orifice.
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
++Contact local gas utility or distributor for Btu value of gas.
BOILERS FOR USE AT HIGH ALTITUDE
TABLE #2: SERIES 90 PROPANE GAS
series 90-50
stock Factory
settings
2300
0-5,000
50
2.5
43331095
series 90-75*
stock Factory
settings
2300
0-5,000
75
2.5
43331093
series 90-100
stock Factory
settings
2300
0-5,000
100
2.5
43331091
Btu Value of lP Gas++
2350
2400
5,000-10,000
–
–
3
3
2.5
43331095
Btu Value of lP Gas++
2350
2400
5,000-10,000
–
–
3.5
3.5
3.5
43331096*
Btu Value of lP Gas++
2350
2400
5,000-10,000
–
–
3
3
43331091
8
2450
2500
–
–
2.5
2450
2500
–
–
3
2450
2500
–
–
3
2.5
–
2.5
–
3
–
2.5
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