Troubleshooting - Honeywell C7076A Operating Instructions Manual

12.7 secure the sight pipe or swivel mount
1 When the flame signal is acceptable and all adjustments have
been made, remove the detector.
2 Secure
the sight
Weld the sight pipe
Tack weld the swivel ball in place in its socket if using a Swivel
Mount.
3 Reinstall the detector.
12.8 Aspirator adjustment
Make the final connections and adjustments of the optional air sup-
ply (if used). Refer to the paragraph page 6 (9.5 Connecting air
supply (optional)).
12.9 Final checkout
1 Before placing the burner into service or after performing any
service, repairs or maintenance, verify the installation using the
procedures in the Checkout sections of the appropriate flame
safeguard control.
2 After completing the checkout, run the burner through at least
one complete cycle to verify correct operation.

13 tRoUBLesHootInG

13.1 General
WARnInG
Electrical Shock hazard.
Can cause serious injury or death.
– Open the master switch to disconnect power 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.
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.
➔ 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).
13.2 equipment required
1 Voltmeter with 0 to 300 V AC scale.
2 Microammeter with 0 to 25 µA range, SPL damping.
3 Meter connector plug (Honeywell part no. 117053 or equiva-
lent)—required for some meters.
For replacements see the web app PartDetective for selecting spare
parts www.adlatus.org. or refer to page 3 (7 Replacement parts).
13.3 Preliminary procedures
IMPoRtAnt If the combustion chamber has a positive pressure,
make sure the aspirator inlet pressure equals or exceeds that re-
quired for sight pipe seal off, as given in page 6 (9.5 Connecting
air supply (optional)) on figure "Minimum inlet pressure or airflow",
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.
pipe (or swivel mount):
in its final position, or
black meter
lead (-)
a If you get a reading above 1.4 µA 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
page 11 (13.5 Procedure B: Flame signal reading present at
detector - flame relay does not pull in).
13.4 Procedure A: Zero flame signal reading at detector -
Flame relay does not pull in
➔ If the detector develops a signal at the Flame Current jack, skip
troubleshooting Procedure A and refer to page 11 (13.5 Pro-
cedure B: Flame signal reading present at detector - flame relay
does not pull in).
1 Complete the Preliminary Procedures listed above.
2 Refer to the wiring diagram on the inside of the front cover plate
for terminal locations or refer to the figures in page 6 (10
Wiring).
3 Check for proper line voltage. Connect an AC voltmeter across
terminals 2 and 1 (or 8, if detector is non- European 240 volt,
50/60 Hz model) on the terminal block. Make sure the AC voltage
measured is within the voltage range listed in the table below, for
the particular detector model used.
➔ The nominal voltage rating is printed on the transformer cover
next to the sensitivity controls on the rear of the plug-in elec-
tronics chassis.
a If there is no voltage, make sure line voltage power is connected
to the master switch, the master switch is closed and overload
protection (circuit breaker, fuse, or similar device) has not opened
the power circuit.
b If the measured voltage is not within the proper voltage range,
make sure the main power supply is of the correct voltage and
frequency. Then trace the wiring between the detector and the
main power supply to determine the problem.
Line voltage ratings for the detector
nominal voltage rating
100
120
220
240
4 Determine if the self-checking shutter is open by looking into the
front of the detector through the pipe in the wiring compartment.
shutter voltage range
nominal detector voltage
range
100
120 or 220/240 V
➔ The nominal voltage rating is printed on the transformer cover
next to the sensitivity controls on the rear of the plug-in elec-
tronics chassis.
EN-10
Sensitivity
MIN
A
MAX
MIN
B
MAX
Flame
Current
red meter C7076 Sensor Amplifier
lead (+)
Acceptable line voltage
Min.
85
102
187
204
Acceptable shutter voltage
Min.
85
99.5
Max.
110
132
242
264
Max.
110
132