Periodic Maintenance - Honeywell C7915A Information

C7915A INFRARED FLAME DETECTOR
TROUBLESHOOTING PROCEDURES
First perform the Preliminary Inspection. Then follow the
applicable procedures for either a low reading or a zero
reading on the flame signal meter. After reinstalling the
detector, recheck the meter reading. Adjust the position of the
detector to try to obtain the proper flame signal. If the
procedures are completed and a satisfactory flame signal
cannot be obtained, replace the detector.
PRELIMINARY INSPECTION
1. Make sure that the flame is properly adjusted and is not
too lean.
2. Check for the proper line voltage. Make sure the master
switch is closed, connections are correct, and power
supply is of the correct voltage and frequency.
3. Check the detector wiring for defects including:
• incorrect connections.
• wrong type or size of wire.
• deteriorated wire.
• open circuits.
• short circuits.
• leakage paths caused by moisture, soot, or dirt.
4. With the burner running, check the temperature at the
detector. If it exceeds 125°F (52°C):
• add additional insulation between the wall of the
combustion chamber and the detector.
• add a shield or screen to reflect radiated heat away
from the detector.
• add cooling (refer to Sight Pipe Ventilation, see
Installation).
PROCEDURE FOR A LOW METER
READING
1. Remove the detector and clean the focusing lens with a
soft, clean cloth.
2. If the focusing lens is broken or damaged, or if it is
coated with a substance that cannot be cleaned off,
replace the 50019469-001 Bushing (which includes the
focusing lens).
3. Clean the inside of the sight pipe before reinstalling the
detector.
4. If the meter reading is still too low, replace the lead sul-
fide cell (Fig. 8).
5. If the meter reading is still too low, replace the plug-in
amplifier.
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6. If you still cannot obtain a proper flame signal, replace
the C7915A Infrared Flame Detector.
PROCEDURE FOR A ZERO METER
READING
1. Replace the lead sulfide cell (Fig. 8). Then recheck the
flame signal.
2. If there is still no flame signal, replace the plug-in ampli-
fier.
3. If you still cannot obtain a meter reading, replace the
entire C7915A Infrared Flame Detector.
IMPORTANT:
At the completion of troubleshooting, be sure to per-
form the Adjustments and Checkout, page 10.
SERVICE
CAUTION
Fire and Explosion Hazard. Only use qualified service
technicians to attempt to service or repair flame
safeguard controls and burner systems.
Open the master switch to disconnect power before
removing or installing the detector.
If the C7915A is disassembled for any reason (e.g., to
replace the lead sulfide cell or bushing with focusing
lens), you must perform the Adjustments and
Checkout, page 10.

PERIODIC MAINTENANCE

1. Clean the focusing lens and sight pipe when necessary.
Remove the detector and use a soft, clean cloth. The
lens does not require removal to clean it. If it is broken
or damaged, or it is coated with a substance that cannot
be cleaned off, replace the 50019469-001 Bushing,
which includes the focusing lens.
2. Keep the flame detection system adjusted for the
smoothest, most reliable operation as recommended by
the burner manufacturer.
3. Replace the bushing with focusing lens or the lead sul-
fide photocell (Fig. 8)
proper operation
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