750-392
CBEX-DE
4-15
Troubleshooting
Proper operation of the flame failure device should be checked at startup and at least once a week thereafter.
Check the program relay’s annunciation for any system failure. Observe the promptness of ignition of the pilot
flame and the main flame.
4.11 — Troubleshooting
This chapter assumes that the unit has been properly installed and adjusted, and that it has been running for
some time. It is further assumed that the operator has become thoroughly familiar with both burner and manual
by this time. The points under each heading are set down briefly as possible causes, suggestions or clues to sim-
plify locating the source of trouble. Methods of correcting the trouble, once it has been identified, may be found
elsewhere in this manual.
If the burner will not start or operate properly, the troubleshooting chapter should be referred to for assistance in
pinpointing problems that may not be readily apparent.
Familiarity with the programmer and other controls in the system may be obtained by studying the contents of
this manual. Knowledge of the system and its controls will make troubleshooting much easier. Costly downtime
or delays can be prevented by systematic checks of 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.
If an obvious condition is not apparent, check the continuity of the circuits with a voltmeter or test lamp. Each
circuit can be checked and the fault isolated and corrected. Most circuitry checking can be done between appro-
priate terminals on the terminal boards in the control cabinet or the entrance box. Refer to the schematic wiring
diagram for terminal identification.
It is advisable to check for tight shutoff of fuel valves. Despite the presence of strainers and other precautions, foreign
material in either new or renovated fuel lines may lodge under a valve seat and prevent tight closure. The situation is
especially true in new installations. Promptly correct any conditions causing leakage. Failure to follow these instruc-
tions could result in serious injury or death.
Troubleshooting should be performed only by personnel familiar with the equipment and who have read and under-
stood the contents of this manual. Failure to follow these instructions could result in serious injury or death.
Disconnect and lockout the main power supply in order to avoid the hazard of electrical shock. Failure to follow these
instructions could result in serious injury or death.
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