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

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PAGE 6 of 46 HG-1-1501 GAS-FIRED HEATER
© SAMUEL JACKSON, INCORPORATED 2011 ALL RIGHTS RESERVED
WHY IS THERE A DELAY AFTER I TURN IT ON?
When the STATUS light comes on, the PLC begins opening and closing valves to test the
integrity of various safety switches located in the heater's control cabinet. If it finds a problem
with one of these devices, it alerts the operator on the display with a description of the problem.
These diagnostics are performed every time the heater is started and continue during operation
until approximately 10 minutes after the heater is turned off. The status of post-burn testing is
shown on the display with the time remaining.
TIPS
Always leave power on the heater during gin season. There is a permanent memory in the PLC
that remembers when you turned off the power and did not permit the computer to check the gas
valves. It will result in ERROR 140 after 6 shutdowns with no leak check.
To prevent lightning damage to the controls in the off season, it is a good idea to turn 3 phase
power off to the control cabinet until it is needed again.
ALARMS and ERRORS are fully described later in this manual. A description will also be found
on a decal in the burner cabinet. The decal will be helpful when reviewing error history of the
heater as only time, date, and error number are displayed. ALARMS will warn the operator of an
impending problem and ERRORS will cause an immediate shutdown.
WHAT ARE THE TESTS AND SETUP PROGRAMS?
The TESTS and SETUP programs can be activated by a qualified service man or trained user to
test the heater and make custom settings. They are always performed at the Samuel Jackson
factory before shipment of a new heater and occasionally in the field, when necessary, for
troubleshooting. The TESTS program allows the service man to proceed through a set of tests
where individual components of the heater can be tested, calibrated, and adjusted.
The TESTS program is described fully in the
TESTS EXPLANATION section of the manual. The
SETUP program is explained in the SETUP EXPLANATION section of the manual.
WHAT ARE THE GAS LEAK TESTS?
Every time the heater is turned off, one of two gas leak tests will be performed automatically. The
heater will alternate between the two tests after each normal shut down. The test takes about 10
minutes to perform and the status of the tests is shown on the Diagnostic Module Display DMD
in the control cabinet. Leak Test 1 checks the integrity of the safety shut off valve SSOV. With
gas evacuated from between the valves in the gas train, if gas builds up pressure and closes the
gas low pressure switch GLPS, then gas is leaking past the “upstream” SSOV. For Leak Test 2,
the gas train is charged with gas at the start of the test so the gas low pressure switch GLPS is
closed. If gas leaks out of the gas train through the Pilot Valve PV, “downstream” SSOV or