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Troubleshooting - Honeywell C7076D Product Data

Adjustable sensitivity ultraviolet flame detectors
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C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS
a. Weld the sight pipe in its final position, or
b. Tack weld the swivel ball in place in its socket if
using a Honeywell 118367A Swivel Mount.
3. Reinstall the detector.
Aspirator Adjustment (C7076A Detector
Only)
Make the final connections and adjustments of the optional air
supply (if used). Refer to the paragraph entitled Connecting
Air Supply.
Final Checkout
Before putting the burner(s) into service, check out the
installation using procedures in the Checkout section of the
instruction sheet for the appropriate flame safeguard control.
After completing the checkout, run the burner(s) through at
least five complete cycles to verify proper operation.

TROUBLESHOOTING

WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Open the master switch before removing or installing
the plug-in electronics chassis or the detector. Line
voltage is present on some of the terminals when
power is on.
General
If you cannot obtain a satisfactory flame signal while adjusting
the sensitivity, refer to the preliminary and troubleshooting
procedures that follow. If you encounter other problems in the
system, refer to the Troubleshooting section in the instruction
sheet for the appropriate flame safeguard control.
Upon completion of the troubleshooting, be sure to perform
the adjustment and checkout procedures previously specified
for the detector.
NOTE: Instructions for replacing the viewing lens, sensing
tube, coil and shutter assembly and plug-in
electronic chassis are given in the Service section.
Before making a replacement, make sure you have the
correct part (check its part number and voltage rating).
Equipment Required
1. Voltmeter (Honeywell W136A or equivalent) with 0 to
300 volt ac scale.
2. Microammeter (Honeywell W136A or equivalent) with 0
to 25 microampere range, SPL damping.
3. Meter connector plug (Honeywell part no. 117053 or
equivalent)—required for some meters.
4. Replacement parts—see Specifications section.
95-8269—1
Preliminary Procedures for C7076A Flame
Detector
IMPORTANT
If the combustion chamber has a positive pressure,
make sure the aspirator inlet pressure equals or
exceeds that required for sight pipe seal off, as given
on Fig. 9, before unlatching the detector.
1. If you are using remote sensitivity selection, make sure
that the external selector switch is open if adjusting
Sensitivity Control A or closed if adjusting Sensitivity
Control B.
2. Unlatch the detector and swing it away from the
faceplate.
3. Loosen the four captive screws in the front cover plate
(with the viewing lens) and remove the plate to expose
the terminal block. The wiring diagram is on the inside
of the front cover plate.
4. After each step in the following procedures, relatch the
detector to the faceplate and check for a meter reading
at the Flame Current jack on the detector (Fig. 17).
a. If you get a reading above 1.4 microamperes and
the flame relay (in the flame safeguard control) pulls
in, return to Sensitivity Adjustments.
b. If you do not get a reading, unlatch the detector and
proceed with Troubleshooting Procedure A,
following.
c. If you get a reading but the flame relay (in the flame
safeguard control) does not pull in, unlatch the
detector and proceed with Troubleshooting
Procedure B, following.
Preliminary Procedures for C7076D Flame
Detector
WARNING
Fire or Explosion Hazard.
Can cause serious injury or death.
Make sure that the environment surrounding the
C7076D Flame Detector is free of all explosive or
hazardous conditions before exposing the interior of
the detector to the atmosphere during the
performance of the following troubleshooting
procedures.
1. If you are using remote sensitivity selection, make sure
that the external selector switch is open if adjusting
Sensitivity Control A, or closed if adjusting Sensitivity
Control B.
2. Remove the six screws that secure the cover plate to
the rear of the detector to provide access to the Flame
Current jack on the electronics chassis.
3. Remove the four screws that secure the faceplate
(attached to the sight pipe) to the detector housing.
Force the faceplate from the housing far enough to
allow the detector to be sufficiently reoriented on the
conduit to provide access to wiring at the terminal block
in detector.
16

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