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Gas Pressure Specifications
Gas Pressure Regulator
The gas valve is provided with pressure taps to meas-
ure gas pressure upstream of the gas valve and
downstream which is the same as the manifold pres-
sure.
Type of
Gas
Inches WC
Regulator
Setting
Min. Max.*
Natural 7.0 10.5 4.0
Propane 12.0 13.0 11.0
*Do not exceed maximum inlet gas pressure. The minimum value
shown is for input adjustment.
Table H: Gas Pressure Specifications
The gas pressure regulator is preset and sealed at 4
in. WC for natural gas, and 11 in. WC for propane gas.
Between the gas valve and the burners is a 1/8 in. pipe
plug. The pressure at this point, taken with a manome-
ter, should be about 3.7 in. WC natural gas and 10.5
in. WC propane gas. Lo NOx models should be 3.9 in.
WC natural gas only. If an adjustment is needed,
remove seal and turn adjustment screw clockwise to
increase pressure or counter-clockwise to decrease
pressure.
Water Connections & System
Piping
The pipe size and fittings between the heater and the
tank should be at least 1-1/2" for all models. The tank
should be located as close to the heater as possible,
as shown in Fig. 13 below.
Fig. 13: Heater with Storage Tank