Rapid 2005 - Burner

B-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
138 of 147
22.3 Burner
PROBLEM POSSIBLE CAUSE SOLUTION
Flame control does not try for
ignition
Auxiliary contact "M1" not closed. Power on terminal
"4"?
Properly mount contact or replace
Burner/winter switch closed? Power on terminal "7"? Replace switch
High temp limit switch tripped? Power on terminal
"8"?
Manually reset or replace
Low airflow pressure switch contacts not made.
Power on terminal "8A"?
Check blower operation
Reconnect tubes to pressure
switch
Clean pressure test tubes
Check filters/duct work for restric-
tions
High airflow pressure switch contacts not made.
Power on terminal "9"?
Check blower FLA and compare to
data plate.
Cabinet pressure too high check
system setup and for restrictions
down stream of blower.
Optional: Mild weather stat, dial set to low
Set dial higher
Replace stat
Optional: High gas pressure switch
Man
ual reset
Verify gas pressure
Optional: Low gas pressure switch
Manual reset
Verify gas pressure
No power between terminals 3 and L2 (neu tral) or 6
and L2 (neutral) for RM7890A (5 and L2 (neutral) or
7 and L2 (neutral) for RM7897C) of the burner control
base
Verify wiring
Flame control defect Replace
Burner Lockout
Failure to ignite pilot or main flame
Flame control failure
Reset the flame control module at
the unit and proceed to the next
step, observing the unit to indicate
at which step lockout condition
occurs.
No PILOT flame
UV flame sensor indicating presence of flame before
ignition. Flame indicator light present? Is there 5VDC
on UV flame amplifier?
Separate spark wire and UV scan-
ner wires.
Replace UV flame sensor, UV
flame amplifier or burn control.
No spark
Check wiring from burner control to
ignition transformer.
Check high tension wire to spark
plug.
Replace ignition transformer.
No gas
Open manual gas sh
ut off valves.
Check wiring from burner control to
pilot gas valve.
Verify inlet gas pressure.
Adjust pilot gas pressure.
Replace pilot gas valve.
Check burner pilot opening for
obstruction.
Pilot flame does not stay lit
Improper pilot gas pressure Adjust pilot gas pressure.
UV flame scanner does not dedect flame, Is there
5VDC on UV flame amplifier?
Replace UV scanner
Replace UV flame amplifier
UV flame scanner dirty Clean UV scanner