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Large Unit Heater
12
Operating Instructions and Owner’s Manual
LEAK TESTING
WARNING: Use a soap solution or equivalent for leak testing.
Never test for leak with an open flame such as with matches
or candles. Failure to comply could result in personal injury,
property damage, or death.
• Always leak test final gas assembly for gas leaks according to
the procedures outlined in NFPA 54 and all local codes and/or
Standards.
• After gas piping is completed, carefully check all piping connec-
tions, (field and factory), for gas leaks.
• Due to the natural heating cycles and vibration of this unit it is
recommended, as part of its annual maintenance, to check these
connections for proper tightness and leak-check with a soap solu-
tion or other preferred means prior to putting into service.
For leak testing on pressures below 20 inches W.C.:
Before leak testing, close the field installed manual shut off valve
shown on Figure 9 on the supply line to isolate the gas valve from the
pressure.
NOTICE: All factory installed gas connections have passed an approved
leak test.
For leak testing on pressures above 20 inches W.C.:
When leak testing with pressures above 20 inches W.C., the unit must
be isolated from the supply pipe. Close the field installed manual shut
off valve, disconnect the supply line to the unit, and temporarily cap
the supply line for testing purposes.
WARNING: Gas pressures to the appliance controls must
never exceed 20 inches W.C.. Supply pressures greater than
20” W.C. can damage the controls, resulting in personal
injury, property damage, or death.
NOTICE: In case emergency shutdown is required, shut down main
gas valve and disconnect main power to unit. These devices should be
properly labeled by the installer.
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