Advertisement
C7061A,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
TROUBLESHOOTING
WARNING
Electrical shock hazard.
Can cause serious injury or death.
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 included with the
control, a flame signal displays on the module.
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 to replace 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 meter reading or a zero
meter reading. 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 yet cannot obtain a proper flame
signal, replace the detector.
Preliminary Inspection
1. 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.
2. Check the detector wiring for defects:
a. Incorrect 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.
3. With the burner running, check the temperature at the
detector. If it exceeds 175°F (79°C):
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).
65-0223—07
Removing Detector from Sight Pipe
(Refer to Fig. 8)
Loosen the three screws holding the mounting flange; 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 is free when the collar is unscrewed;
do not drop it.
Procedure for Zero Meter Reading
1. Replace the plug-in amplifier. Then recheck the flame
signal.
2. Replace the ultraviolet sensing tube (see Service
section). Then recheck the flame signal.
3. Replace the coil and shutter assembly (see Service Sec-
tion). Then recheck the flame signal.
4. If you cannot yet obtain a meter reading, replace the
detector.
IMPORTANT
At the completion of Troubleshooting, be sure to
perform the Adjustments and Checkout procedures.
SERVICE
WARNING
Electrical shock hazard.
Can cause serious injury or death.
Open the master switch to disconnect power before
removing or installing the detector or its cover. More
than one disconnect can be involved.
Periodic Maintenance
1. Clean the viewing window (or focusing lens) when
necessary. Remove the detector (see Troubleshooting
section) and use a clean cloth over the eraser end of a
pencil. Do not remove the window (or lens) to clean it. If
it is broken or damaged or it is coated with a substance
that cannot be removed, replace it (see Fig. 13).
2. Keep the flame detection system adjusted for the
smoothest, most reliable operation as recommended by
the burner manufacturer.
3. Replace the sensing tube, coil and shutter assembly,
or viewing window only when necessary to obtain proper
operation.
Removing Detector Cover (All
Models):
1. Open the Master Switch.
2. Unscrew the four captive cover screws (Fig. 7) and care-
fully slide off the cover.
NOTE: These bolts are removable. Put them in a safe place
to avoid losing them.
10
Hide quick links:
Advertisement
