Gas Line Testing; Gas Pressure Testing - Hayward FDXLGCKW135NP Installation Manual

Gas Line Testing

CAUTION: If pressure testing above 0.5 psi (14" w.c.) is to be performed on the gas supply piping,
the heater and its individual shutoff valve must be disconnected from the gas supply.
Turn the gas supply "ON" and test all pipe joints for leaks using a soap and water solution.
WARNING: EXPLOSIVE HAZARD. The use of an open flame to check for gas leaks could
cause an explosion resulting in severe injury and/or death. Shut off gas and fix even the
smallest leak right away. Be sure to leak test the heater gas manifold fittings using the
above procedure once the heater is in operation.

Gas Pressure Testing

The following gas pressure requirements are important to the proper operation of the burners in
gas heaters. Improper gas pressure or gas volume will create the following conditions:
1. Flame burns totally yellow
2. Flame lifts off the burner
3. Heat exchanger soots up
The gas pressure regulator on all heaters is preset at the factory, but the setting should be verified
by the installer to ensure proper operation.
If gas pressure is inadequate, check for undersized piping between the gas meter and the heater
or for a low capacity meter.
Gas pressure test procedure:
1. Obtain the necessary equipment:
a. Manometer to read pressure
b. Small flat screwdriver
c. Allen wrenches
d. 1/8"-27 NPT barbed fitting
2. Using an Allen wrench, loosen the screw in the manifold pressure tap (refer to the diagram of
your model on page 4).
WARNING: EXPLOSIVE HAZARD. Do not remove the measurement tap screws with the
valve in the "ON" position and gas supplied to theater. No gas pressure must be present
when the taps are open to the atmosphere. Removal of the tap screws or barb fittings
with gas present could cause an explosion resulting in sever injury and/or death.
3
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS