Figure 29. Pressure Switch
Measure and Adjust Manifold (Outlet) Gas Pressure
If the heater is being installed at an elevation ≤2,000 feet (≤610 meters), adjust the manifold (outlet) gas pressure in
accordance with the Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) section.
If the heater is being installed at an elevation >2,000 feet (>610 meters), adjust the manifold (outlet) gas pressure in
accordance with the Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) section.
⚠ WARNING ⚠
Valve outlet gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane.
The maximum inlet supply pressure for natural gas or propane is 14 IN WC.
⚠ CAUTION ⚠
Before attempting to measure or adjust valve outlet gas pressure, the inlet supply pressure must
be within the specified range, both when the heater is in operation and when it is on standby.
Incorrect inlet pressure could cause excessive valve outlet gas pressure immediately or at some
future time. If natural gas supply pressure is too high, install a regulator in the supply line before
it reaches the heater. If natural gas supply pressure is too low, contact your gas supplier.
NOTES:
• Measuring outlet pressure cannot be done until the heater is in operation.
• During normal operation with natural gas at sea level, adjustment to factory-setting should not
be necessary.
• For natural gas: when the heater leaves the factory, the combination gas valve is set so that the
valve outlet gas pressure for a single-stage valve is regulated to 3.5 IN WC. Inlet supply pressure
to the valve for natural gas must be a minimum of 5 IN WC or as noted on the rating plate and a
maximum of 14 IN WC.
• For propane: the heater is shipped factory-equipped for use with natural gas. A propane conversion
kit is included. Follow the instructions in the Converting Unit from Natural Gas to Propane section
to convert for use with propane. Inlet supply pressure to the valve for propane must be a minimum
of 11 IN WC and a maximum of 14 IN WC.
46
UEZ-IOM (07-23) 1034347-I
ADJUSTMENTS—CONTINUED
Pressure Switch Replacement—Continued
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