SAMUEL JACKSON HG-1-1501, Service And Operation Manual

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PAGE 26 of 46 HG-1-1501 GAS-FIRED HEATER
© SAMUEL JACKSON, INCORPORATED 2011 ALL RIGHTS RESERVED
IGT TRANSFORMER -- The +/- switch is now used to test the Ignition Transformer
IGT. The blower 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 blower 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.