R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
60-0770—2
21
Symptom
Test
Possible Cause/Correction
D. Programmer stops during
prepurge and does not
continue sequence
(Continued).
4. If an external Low Fire switch is used,
check that it is closed.
4. If switch is open:
a. Check Low Fire switch; replace if
necessary.
b. Check firing rate motor and its
transformer; replace if necessary.
c. On an R4140M model with open
damper contacts.
—Check damper actuator; replace if
necessary.
E. Pilot (or first stage burner
if using direct spark ignition)
does not ignite; safety
shutdown occurs.
1. Close all manual main fuel shutoff valves
immediately, and let programmer complete
its revolution.
1. Make sure that:
a. Manual pilot shutoff valve (or manual
first stage valve) is open.
b. Fuel is available.
c. Fuel lines are not plugged.
2. Reset Lockout switch and let programmer
run through another cycle.
2. If pilot (or first stage flame) is established,
operation is OK; proceed to step 8.
3. If pilot (or first stage burner) still does not
ignite, close all manual fuel shutoff valves,
open master switch, and remove
programmer from subbase.
3. Make sure that:
a. Ignition electrodes are clean.
b. External circuits are wired correctly;
replace deteriorated Ieadwires.
4. Check operation of ignition transformer:
Jumper terminals L1-5, L1-6, or L1-18 on
subbase. (Refer to appropriate wiring
diagram to determine proper terminals.)
Close master switch, and watch for spark
or listen for buzz.
4. If ignition spark is not strong and
continuous, open master switch and adjust
ignition electrode spark gap setting to
manufacturer’s recommendation. If a
strong, continuous spark still cannot be
obtained, replace ignition transformer.
5. Check operation of automatic pilot valve (or
first stage valve): open master switch, and
jumper terminals L1-5 or L1-6 on subbase.
(Refer to appropriate wiring diagram to
determine proper terminals.) Close master
switch, and listen for click or feel head of
valve for activation.
5. If valve or actuator is not operating
properly, replace it.
6. Open master switch, remove test jumpers
from subbase, and reinstall programmer on
subbase.
6. No action.
7. Open manual pilot shutoff valve (or manual
first stage valve), reset lockout switch,
close master switch, and recycle
programmer.
7. If pilot (or first stage flame) is still not
established, replace programmer.
8. When pilot (or first stage burner) ignites
satisfactorily, repeat appropriate Initial
Lightoff Check and Pilot Turn-down Test.
8. Follow instructions in the Checkout section.
F. Pilot (or first stage burner
if using DSI) ignites, but relay
2K does not pull in; safety
1. Close all manual fuel shutoff valves
immediately, and let programmer complete
its revolution.
1. No action.
shutdown occurs.
2. Perform the Flame Signal Check following
this table.
2. Follow instructions in Flame Signal Check.
G. Pilot (or first stage burner)
ignites and relay 2K pulls in,
but main burner (or second
stage burner) does not light.
(Safety shutdown occurs
when using an interrupted
pilot.)
1. Shut down system (lower burner controller
setpoint) and check manual main burner
shutoff valve (or manual second stage
valve).
1. Make sure that:
a. Manual fuel shutoff valve is open.
b. Fuel is available.
c. Fuel lines are not plugged.
d. Air and fuel supplies are adjusted for
the correct air-fuel ratio.
2. Reset Lockout switch (if tripped), raise
setpoint, and let programmer run through
another cycle.
2. If main burner flame (or second stage
flame) is established, operation is OK;
proceed to step 8.
Table 5. Troubleshooting Chart
(Continued).
(Continued)