lp-441 Rev. 004 Rel. 000 Date 7.2.21
34
D. Gas Valve
Figure 24 - Gas Valve
Strain on the gas valve and fittings may result in vibration, premature
component failure and gas leakage, and cause fire, explosion,
property damage, severe personal injury, or death.
Adjustments to the throttle screw or offset may only be made by
a qualified gas technician using a calibrated combustion analyzer
capable of measuring CO2 and CO. Failure to follow this instruction
could result in fire, explosion, property damage, severe personal
injury, or death.
E. Checking Gas Pressure at the Water Heater for Proper
Operation
NOTE:
Refer to Figure 24 when checking gas pressure.
1. The water heater and its individual shutoff valve must be
disconnected from the gas supply piping system during any pressure
testing of the system at pressures greater than ½ psi (3.5 kPa).
2. The water heater must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal to or
less than ½ psi (3.5 kPa). Loosen the screw on the pressure tap inlet to
attach a manometer and check the gas inlet pressure.
The minimum and maximum inlet gas line pressures must meet the
requirements shown in Table 13.
Natural or LP Gas
Minimum Pressure
3.5” WC
Maximum Pressure
14”WC
Table 13 - Gas Pressure Requirements
Do not fire (operate) the water heater until all connections have
been completed and the heat exchanger is filled with water. Doing
so will damage the water heater and void the warranty.
