R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
60-0770—2
23
Table 5. Troubleshooting Chart
(Continued).
(Continued)
Symptom
Test
Possible Cause/Correction
J. Burner stays at low fire
during Run period. (Not
applicable for R4140M model
without open damper
contacts.)
1. For an R4140G or L, check 4-wire firing
rate switching circuitry.
1. a. Make sure that external circuits are
wired correctly; replace deteriorated
leadwires.
b. Check firing rate motor and its
transformer; replace, if necessary.
c. Check Series 90 Controller; replace, if
necessary.
2. For an R4140M with open damper
contacts, check one-wire firing rate
switching circuitry.
2. a. Make sure that external circuits are
wired correctly; replace deteriorated
Ieadwires.
b. Make sure jumper wire is installed
between terminals 11 and 12 on the
subbase.
c. Check damper actuator; replace if
necessary.
K. Shutdown occurs during
Run period.
1. Close all manual fuel shutoff valves
immediately, let programmer complete its
revolution, open master switch, and check
the Lockout switch on the programmer.
1. No action.
2. If the Lockout switch has not tripped (if the
reset button has not popped out):
a. Check that all limits are closed.
b. For an R4140G or M, check that all
running interlocks, including the Airflow
switch, are closed.
2. Follow steps a. and b., as applicable.
a. If a limit is open, determine cause(s)
and correct condition(s).
b. If a running interlock is open, determine
cause(s) and correct condition(s). Make
sure that there is airflow. If not:
— check burner motor; replace if
necessary.
— check Airflow switch; replace if
necessary.
3. If the Lockout switch has tripped (if the
reset button has popped out):
a. For an R4140L only, check that all
lockout interlocks, including the Airflow
switch, are closed.
b. If using an infrared (lead sulfide) flame
detector, perform the Hot Refractory
Saturation Test.
c. Check the flame detection system.
d. If flame detection system is OK, check
fuel lines and automatic fuel valves.
3. Follow steps a. through d., as applicable.
a. If a lockout interlock is open, determine
cause(s) and correct condition(s). Make
sure that there is airflow. If not:
— check burner motor; replace if
necessary.
— check Airflow switch; replace if
necessary.
b
Follow instructions in the Checkout
section.
c. Perform the Flame Signal Check
following this table.
d. Clean fuel lines; replace valves and
actuators, if defective. (Refer to
applicable procedures for Symptoms E
and G.)
CAUTION
Replace all external devices not operating properly. Do not bypass external devices.
L. Timer does not complete
its revolution after operating
setpoint was reached.
1. Check that the burner controller contacts
are open.
1. If burner controller is not operating
properly, replace it.
M. Burner motor keeps
running at end of cycle.
1. Check burner motor starter.
1. If starter is mechanically stuck, repair it or
replace it.
2. Check external burner motor circuits.
2. Make sure circuits are wired correctly;
replace deteriorated leadwires.