PAGE 22 of 41 HG-1-1401A GAS-FIRED HEATER
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
IGT TRANSFORMER --
The +/- switch is now used to test the ignition transformer.
The fan will turn on when this test is entered and it must run 20 seconds to purge the duct
system with air before this test can proceed. After the 20 seconds, turning the +/- switch
to “+” turns on the ignition transformer IGT. If the gin is quiet, you can hear the spark. If
there is difficulty, check the spark plug electrode gap at 1/16 to 1/8" (1.5 to 3 mm). Hold
the IGT on for two seconds while observing the flame light on the local panel LP. If the
flame light turns on, it means that there is electrical interference between the spark plug
wire and the flame electrode wire. They should be run to the burner in separate conduits
to avoid such interference. Since the operating program makes a similar test before each
ignition, the burner will not operate until this problem is corrected. INTERFERENCE
will flash on the display if electrical interference occurs.
TRY IGNITE --
The fan will run for 20 seconds before the burner attempts to ignite.
During the first 5 seconds of this period, the first SSOV and PV gas valves open for 5
seconds to purge gas out of the piping system to the burner head. After the 20 seconds,
trial for ignition occurs and only lasts 10 seconds. During this time, adjust the gas low
fire valve (shown on next page). Start with it closed, and slowly open it until the burner
ignites. Adjust it for the lowest flame possible, yet high enough for dependable ignition.
The burner should now operate normally, with GVM free to modulate the flame up to
high output. Make sure that the temperature is responding correctly. The burner will
automatically shut down after 10 minutes or when STOP is operated, air flow fails, or on
flame failure.
If flame fails during startup, crack the gas low fire valve open a little more and try the
test again.
To exit the test program, kill power or press SELECT and turn the +/- switch to BACK.
Press SELECT button once. The STATUS light should stop blinking. To operate the
burner normally, operate the
START-STOP (
O
-
I
).
Gas Pilot Valve
(PV)
Gas low fire valve is
fully closed when
handle is cross ways to
pipe.