Sequence of Operation
4-6
750-368
CBEX Elite 100-1200 HP
flame detecting circuit will respond to de-energize the main fuel valve circuit within 2 to 4 seconds to stop the
flow of fuel. The reset switch lights and lockout occurs immediately. The blower motor will continue to oper-
ate.
The flame failure light and alarm bell (optional) are energized 10 seconds later.
The blower motor will be de-energized. The lockout switch must be manually reset before operation can be
resumed.
3. Loss of flame: If a flame outage occurs during normal operation and/or the flame is no longer sensed by the
detector, the flame relay will trip within 2 to 4 seconds to de-energize the fuel valve circuit and shut off the
fuel flow. The reset switch lights and lockout occurs immediately. The blower motor continues operation. The
flame failure light and alarm bell (optional) are energized 10 seconds later.
The blower motor will be de-energized. The lockout switch must be manually reset before operation can be
resumed.
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 manual 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 appropriate manuals.
Knowledge of the system and its controls will make troubleshooting much easier. Costly downtime 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.
To Next Page
Loading...
Need help?
General
