Troubleshooting; Failure To Light Main Burner; Loss Of Flame During The Run Period; Opening Of A Lockout Interlock - Honeywell R4140G Installation Instructions Manual

R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
c. Reset the Lockout switch, if tripped.
d. Close the master switch.
e. Start the system with a call for heat. (Raise the
setpoint of the burner controller.)
f. Ignition spark should occur and the automatic
pilot valve (or automatic first stage valve) should
be energized, but the pilot (or first stage burner)
cannot ignite. No flame is detected so relay 2K
cannot pull in.
g. Safety shutdown should occur about one-half
minute after ignition spark occurs.
Failure to Light Main Burner (Unless Flame Detector is
an Intermittent Pilot).
Monitoring
NOTE: If using direct spark ignition, perform Test
instead.
a. Open the manual pilot shutoff valve; leave the
manual main fuel shutoff valve(s) closed.
b. Reset the Lockout switch.
c. Start the system.
d. The pilot should ignite and pull in relay 2K, but
the main burner cannot light.
e. Relay 2K should drop out within four seconds
after the pilot goes out.
f. Safety shutdown should occur about one-half
minute after 2K drops out.

Loss of Flame During the Run Period.

a. Open the manual main fuel shutoff valve(s); the
manual pilot shutoff valve must also be open if a
pilot is used.
b. Reset the Lockout switch.
c. Start the system. Startup should be normal; the
pilot (or first stage burner) and the main burner
should light normally.
d. After the timer stops for the Run period with the
burner(s) firing, close all manual fuel shutoff
valves to extinguish all burner flames.
e. Relay 2K should drop out within four seconds
after all burner flames go out.
f. Safety shutdown should occur about half a
minute after 2K drops out.
Detection of a Flame (or a Condition Simulating a
Flame) Before or During Prepurge (R4140L Only).
a. Make sure all interlocks are closed.
b. Reset the Lockout switch.
c. Start the system.
d. At about 30 seconds, momentarily simulate a
flame to pull in relay 2K. (Actuate the flame
detector with a flame, or use a flame simulator—
see Flame Signal Check in the Troubleshooting
section.)
e. When relay 2K pulls in, relay 3K should drop out,
and there should be no ignition.
f. Safety shutdown should occur about one-half
minute after 3K drops out.
Opening of a Preignition Interlock During Prepurge
(R4140L Only).
a. Make sure all interlocks are closed.
b. Reset the Lockout switch.
c. Start the system.
d. After about 30 seconds, open a preignition
interlock.
e. Relay 3K should drop out, and there should be no
ignition.
f. Safety shutdown should occur about one-half
minute after 3K drops out.
60-0770—2
Opening of a Lockout Interlock (R4140L Only).
a. Make sure all manual fuel shutoff valves are
open; this includes the manual pilot shutoff valve
if using a pilot, and all manual main burner shutoff
valves.
b. Make sure all interlocks are closed.
c. Reset the Lockout switch.
d. Start the system. Startup should be normal; the
pilot (or first stage burner) and the main burner
should light normally.
e. After the timer stops for the Run period with the
burner(s) firing, open a lockout interlock.
Manually turn off the burner motor (blower) to
open the Airflow switch, or gradually turn up (or
down) the fuel pressure to open a fuel pressure
switch.
f. Relay 3K should drop out, the automatic fuel
valves should close, and the burner flame(s)
should go out.
g. Safety shutdown should occur about one-half
minute after 3K drops out.
IMPORTANT
1. If the Lockout switch fails to trip and shut down the
system on any of these tests, replace the
programmer and rerun all Checkout tests from the
beginning.
2. When all Checkout tests are complete, reset all
controller setpoints to the desired values.
CAUTION
If low fuel pressure limits were bypassed for any of
the tests in this Checkout section, make sure you
remove the jumpers from these limits before putting
the system into service.

TROUBLESHOOTING

CAUTION
all
1. Close manual fuel shut off valves as soon as
trouble occurs.
2. Use extreme care while troubleshooting the
programmer; line voltage is present on most
contacts when power is on.
3. Open the master switch before removing or
replacing the relay/timer cover, before removing
the programmer from the subbase, before
reinstalling the programmer, before installing or
removing any test jumpers, before making any
adjustments, and before replacing any devices.
4. Replace all external devices not operating
properly. Do not bypass external devices.
5. Make sure you remove all test jumpers from the
subbase when troubleshooting is complete.
6. Replace the relay/timer cover on completion of
troubleshooting.
Equipment Required
1. Honeywell W136A Voltmeter or equivalent with 0 to
300 Vac scale.
2. Honeywell W136A Microammeter or equivalent with
0 to 25 microamp range and SPL scale with damping.
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