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R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
Symptom
N. Relay 2K stays in at end of
cycle. (R4140G, R4140M, and
R414011030 cannot start new
cycle; for all other R41401
models, safety shutdown
occurs after the new cycle
starts.)
O. External alarm (if used)
does not go on when safety
shutdown occurs.
Flame Relay (2K) Hold-In Check
Make sure all burner flames are extinguished. (If using
an intermittent pilot, make sure the pilot flame is
extinguished.) If a flame is still burning, check the
external wiring and operation of the automatic valves
and actuators. (Refer to applicable procedures for
Symptoms E and G in Table 5.) Replace if defective.
If the flame detector is a rectifying photocell or infrared
(lead sulfide) detector, perform the Hot Refractory Hold-
in Test in the Checkout section.
If the plug-in flame signal amplifier is an R7248A or B
Infrared Amplifier (red), open the master switch and
install a new amplifier.
If the plug-in flame signal amplifier is an R7247A
Rectification Amplifier (green) or an R7249A Ultraviolet
Amplifier (purple), momentarily short the tip jack to the
programmer chassis (Fig. 12). If this does not cause
relay 2K to drop out, open the master switch and install
a new amplifier.
Check the external wiring and operation of the flame
detector (see step
of the Flame Signal Check).
Replace if faulty.
PLUG-IN
AMPLIFIER
LEADWIRE WITH
TIP JACK
INSULATION
REMOVED
FROM
ENDS
TIMER
DIAL
PROGRAMMER
CHASSIS
M7962
Fig. 12. Checking plug-in flame signal amplifier for 2K
hold-in (R7247A or R7249A only).
60-0770—2
Table 5. Troubleshooting Chart (Continued) .
Test
1. Perform the Flame Relay (2K) Hold-In
Check immediately following this table.
1. Check external alarm circuits.
2. Check the alarm.
TOUCH END TO
CHASSIS—RELAY 2K
SHOULD DROP OUT.
Possible Cause/Correction
1. Follow instructions in the Flame Relay (2K)
Hold-In Check.
1. Make sure circuits are wired correctly;
replace deteriorated leadwires.
2. If alarm is not operating properly, replace it.
Flame Signal Check
IMPORTANT
If the flame relay 2K does not pull in when the pilot
(or first stage burner) ignites, or if shutdown occurs
during the Run period, perform this check. The flame
detector, plug-in flame signal amplifier, and flame
relay 2K form a flame detection system, which can
be disabled by failure of any of the components.
Open the master switch and plug a microammeter into
the meter jack on the plug-in amplifier (Fig. 10).
Make sure all manual fuel shutoff valves are closed.
Open the manual pilot shutoff valve (or manual first
stage fuel valve if using direct spark ignition).
Reset the Lockout switch and close the master switch
to start the programmer.
When the pilot (or first stage burner) ignites, measure
the flame signal as described in Flame Signal
Measurement in the Checkout section. If the signal is
unstable or weak, check the flame detector installation
and circuitry as instructed.
Recycle the programmer and measure the flame signal
again to obtain a good reading. If the flame signal is
unstable or less than the minimum acceptable value
listed in Table 4, proceed to step
continue with step
If the flame signal is stable and above the minimum
acceptable value listed in Table 4, either the amplifier or
the programmer is faulty.
a.
Let the programmer complete its revolution and
open the master switch.
b.
Replace the plug-in amplifier with a new one of
the same part number.
c.
Reset the Lockout switch, close the master
switch, recycle the programmer, and measure the
flame signal again.
d.
If the flame signal is OK and relay 2K pulls in,
operation is normal. Omit steps
perform the Pilot Turndown Test in the Checkout
section (unless using direct spark ignition).
e.
If the flame signal is OK but relay 2K still does not
pull in, replace the programmer. (Keep the plug-in
amplifiers.) Repeat all required tests in the
Checkout section.
24
. Otherwise,
.
through
, and
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Troubleshooting
