Chapter 4 — Sequence of Operation
4-8 Part No. 750-184
The program relay has the capability to self-diagnose and to display a code
or message that indicates the failure condition. Refer to the control bulletin
for specifics and suggested remedies. Familiarity with the program relay and
other controls in the system can be obtained by studying the contents of the
manual and this bulletin.
Knowledge of the system and its controls will make troubleshooting much
easier. Costly down time or delays can be prevented by systematic checks of
the actual operation against the normal sequence to determine the stage at
which performance deviates from normal. Following a routine may possibly
eliminate overlooking an obvious condition, often one that is relatively
simple to correct.
Remember, a safety device, for the most part, is doing its job when it shuts
down or refuses to operate. Never
attempt to circumvent any of the safety
features.
Preventive maintenance and scheduled inspection of all components should
be followed. Periodic checking of the relay is recommended to see that a
safety lockout will occur under conditions of failure to ignite either pilot or
main flame, or from loss of flame.
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