Various Troubleshooting - Honeywell C7061A1020 Product Handbook

VARIOUS
TROUBLESHOOTING
CAUTION
1. Be extremely careful while troubleshooting the
detector; line voltage is present on some of
the terminals when power is on.
2. Open the master switch to disconnect power
before removing or installing the detector or
its cover. More than one disconnect may be
involved.
Equipment Required
A volt-Ohm meter with a minimum sensitivity of one megohm
/ Volt and a zero to five or ten Vdc scale is suggested. When
the keyboard display module is available, a flame signal
displays on the module. For revision of a flame safeguard
control using the R7061 amplifier, use the W136 or a similar
test meter. For replacement parts, see specifications section.
UV Sensor Tube Test
see UV sensor tube test section.
Unsatisfactory Flame Signal
If a satisfactory flame signal (see Table 1) cannot be obtained
while adjusting the sighting position of the detector, follow
these procedures. If you encounter other problems in the
system, refer to the Troubleshooting section in the
instructions for the appropriate flame safeguard control.
NOTE: For instructions for replacing the viewing window,
sensing tube, and coil and shutter assembly, see
the service section.
Troubleshooting Procedures
First perform the preliminary inspection. Then follow the
applicable procedures for either a low reading or a zero
reading on the meter. After reinstalling the detector or
replacing its cover, recheck the meter reading. To try to obtain
the proper flame signal, adjust the position of the detector. If
you complete all of the procedures and still cannot obtain a
proper flame signal, replace the detector.
Preliminary lnspection
A 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.
B Check the detector wiring for defects:
a. lncorrect connections.
b. Wrong type or size of wire.
c. Deteriorated wire.
d. Open circuits.
e. Short circuits.
f. Leakage paths caused by moisture, soot, or dirt.
C With the burner running, check the temperature at the
detector. If it exceeds 79°C (175°F):
a. Add additional insulation between the wall of the
combustion chamber and the detector.
b. Add a shield or screen to reflect radiated heat away
from the detector, or
c. Add cooling (refer to sight pipe ventilation and
accessories sections).
Removing the Detector from the Sight Pipe
C7061A:
Loosen the three screws holding the mounting flange
together; rotate the detector slightly so the screws clear the
slots in the back section of the flange; separate the flange;
and pull off the back section (with the UV Sensor).
NOTE: The detector will be free as soon as the collar is
unscrewed; do not drop it.
C7061F:
Carefull unscrew from sight pipe
Procedure for a Zero Meter Reading
A Replace the plug-in amplifier. Then recheck the flame
signal.
B Replace the ultraviolet sensing tube (see Service section).
Then recheck the flame signal.
C Replace the coil and shutter assembly (see Service below).
Then recheck the flame signal.
D If you still cannot obtain a meter reading, replace the
detector.
IMPORTANT
At the completion of troubleshooting, be sure to
perform the adjustments and checkout procedu-
res.
13 EN1C-0015SZ20 R0602