CleaverBrooks FLX Operation, Service And Parts Manual page 68

Chapter 4
The blower motor will continue to operate. The flame failure
light and the alarm bell (optional) are energized 10 seconds
later.
The blower motor will be deenergized. The lockout switch
must be manually reset before operation can be resumed.
(Refer to the previous caution.)
2. Pilot but no main flame.
When the pilot flame is proven, the main fuel valve circuit is
energized. Depending upon the length of the trial-for-ignition
period, the pilot flame will be extinguished 10 or 15 seconds
later. The flame detecting circuit will respond to deenergize
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 operate.
The flame failure light and alarm bell (optional) are energized
10 seconds later.
The blower motor will be then deenergized. The lockout
switch must be manually reset before operation can be
resumed. (Refer to the previous caution.)
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 deenergize 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 deenergized. The lockout switch
must be manually reset before operation can be resumed.
(Refer to the previous caution.)
If the burner will not start, or upon a safety lockout, the
trouble shooting section in the operating manual and the
technical bulletin should be referred to for assistance in
pinpointing problems that may not be readily apparent.
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.
4-4
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.
Sequence Of Operation
750-177