7
e boilers (with the exception of the 90-75 LP product)
are factory equipped for operation at altitudes ranging from
0-10,000 feet above sea level. No changes to the factory settings
are required for installations from 0-5,000 feet above sea level.
For altitudes from 5,000-10,000 feet above sea level the gas
manifold pressure will need to be adjusted based upon caloric
(Btu) value of supply gas (contact local gas utility or distributor
for this value). For specic settings refer to Table #1 for natural
gas applications and Table #2 for LP gas applications. Instruc-
tions on how to adjust the gas manifold pressure settings are
shown in
Figures #17 & #18
.
Note that 90-75 LP applications for 5,000 - 10,000 feet above
sea level will require an orice change as well as a gas manifold
pressure adjustment based upon caloric (Btu) value of supply
gas. Refer to Table #2 for altitude orice kit part number. For
replacing the orice refer to specic instructions included with
the kit.
TABlE #1: SERIES 90 NATURAl GAS
SERIES 90-50
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 50 – – – – –
Manifold Pressure In W.C. 2.5 4 4 3.5 2.5 2.5
Orice 43331094 43331094
SERIES 90-75
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 75 – – – – –
Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5
Orice 43331092 43331092
SERIES 90-100
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 100 – – – – –
Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5
Orice 43331090 43331090
++Contact local gas utility or distributor for Btu value of gas.
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