TROUBLESHOOTING
8-7
17. Check the pin on wire #145 at the 1"
connector end, for proper insertion or wear.
18. Make any necessary repairs.
19. If all wires show continuity and all
connections are okay, reconnect wires #145,
#146 and #147 to the safety shut-off valve.
20. Replace the cover plates on the safety shut-
off valve actuator and the AC wiring box.
21. Reconnect the connector 1" connector to the
control pane
l.
22. Reconnect AC power to the unit and start
the unit.
23. If the safety shut-off valve still does not
open, proceed to section 8.5.6
24. Be sure to return the safety shut-off valve to
its original position and replace all electrical
cover plates.
8.5.4 SPARK IGNITOR
1. Disconnect AC power to the unit.
2. Remove the spark ignitor as per Section 7.2
of this manual.
3. Inspect the ignitor for signs of erosion.
4. Replace the ignitor if eroded.
5. Check for carbon build-up on the ignitor
6. If there is ignitor carbon build-up, the
combustion calibration settings must be
checked as per Sections 4.2 and 4.3. If the
spark ignitor is not eroded, it may be
cleaned and reused.
8.5.5 FLAME DETECTOR
1. Disconnect AC power to the unit.
2. Remove the flame detector as per
Maintenance Section, 7.3.
3. Check the detector for signs of erosion or
carbon build-up.
4. If the flame detector is eroded, replace it.
Otherwise, clean it using emery cloth.
5. Carbon build-up on the flame detector
indicates that unit may require combustion
calibration.
6. Check the combustion calibration settings as
per Sections 4.2 and 4.3.
8.5.6 IGNITION CIRCUIT
1. Disconnect AC power to the unit.
2. Close the manual leak detection valve,
located between the safety shut-off valve
and the differential pressure regulator, on
the unit’s gas manifold.
3. Using a spare ignitor, connect the ignition
cable directly to the ignitor.
4. Ground the ignitor to the frame of the unit.
5. Reconnect AC power to the unit.
6. Start the unit.
WARNING!
ELECTRIC SHOCK HAZARD. THE
SECONDARY OF THE IGNITION
TRANSFORMER HAS A POTENTIAL OF
6000 VOLTS. DO NOT HOLD OR TOUCH
ANY IGNITION CIRCUIT COMPONENTS
WHILE TESTING.
7. At ignition an arc should be observed. It
should last for approximately 10 seconds.
8. If there is no arc, disconnect AC power to
the unit.
9. Remove the ignition cable and check it for
continuity or loose connections.
10. Replace the cable if there is no continuity or
if there is a loose connection.
11. If the ignition cable is okay, remove the
ignition transformer cover plate.
12. Referring to system schematic 161453 in
Appendix H, locate wires #140 and #141.
13. Connect an AC voltmeter across wires #140
and #141.
14. Reconnect AC power to the unit and start
the unit.
15. At the ignition cycle check for 120VAC
across wires #140 and #141.
16. If 120VAC is observed across wires #140
and #141, replace the ignition transformer.
17. If 120VAC is not observed on the AC
voltmeter during the Ignition cycle,
disconnect AC power to the unit.
Summary of Contents for Benchmark G-00-711
Page 62: ...APPENDIX C ix Temperature Sensor Resistance Chart Balco ...
Page 69: ...APPENDIX F xvi ...
Page 70: ...APPENDIX F xvii ...
Page 71: ...APPENDIX F xviii ...
Page 72: ...APPENDIX F xix ...
Page 73: ...APPENDIX F xx ...
Page 74: ...APPENDIX G xviii ...
Page 75: ...APPENDIX G xix ...
Page 76: ...APPENDIX H xxi ...
