TROUBLESHOOTING
8-13
161453 in Appendix H, check all wires for
continuity.
7. Check all the pins in the 1 ¼" connector for
proper insertion or signs of wear.
8. If all connections, continuity, and the rotation
of the air/fuel valve in Step 4 were okay,
open the control box to expose the wiring
and components.
9. Locate the air/fuel valve stepper motor driver
board.
10. Ensure the connectors and wires are not
loose and are making good contact.
11. If the wiring to the driver board is okay,
place a voltmeter across terminals 7 and 8
on the back of the temperature control.
12. Apply AC power to the unit.
13. Place the ON/OFF switch in the OFF
position.
14. Measure the DC voltage across these two
terminals. It should be 15 volts
±
2 volts.
15. Place the ON/OFF switch in the ON position
16. Measure the DC voltage again. It should be
approximately 3 volts DC during PURGE
and 1 to 1.3 volts during ignition.
17. If the voltage is correct
,
replace the air\fuel
valve driver board.
18. If the voltage remains at 15 volts
±
2 volts
during PURGE or remains at 3 volts during
ignition replace the relay board.
19. If the DC voltage is at 0 volts
,
replace the
temperature controller.
8.7.8 AIR/FUEL VALVE IGNITION
POSITION SWITCH
1. Disconnect AC power to the unit.
2. Remove the air/fuel valve cover
3. Referring to system schematic 161453 in
Appendix H, locate wires #169 and #170.
Remove wires #169 and #170 from the
air/fuel valve ignition position switch, noting
their position. (The air/fuel valve ignition
position switch is the one closest to the shell
of the unit.)
4. Place an ohm meter across the terminals of
the switch, where wires #169 and #170 were
located
5. Manually depress the switch and check the
ohmmeter for continuity.
6. If the switch shows continuity, proceed to
Step 8.
7. If the switch does not show continuity,
replace the switch.
8. Disconnect in the 1 ¼" connector from the
control panel.
9. Referring to system schematic 161453 in
Appendix H, locate wires #169 and #170.
Check wires #169 and #170 for continuity.
10. Check for loose connectors at the switch
end of wires #169 and #170.
11. Check in the 1 ¼" connector ends of wires
#169 and #170 for worn and/or improperly
inserted pins.
12. If continuity, pins and connections are okay,
reattach wire #169 and #170 to the air/fuel
valve ignition position. Reconnect in the 1
¼" connector to the control panel and start
the unit.
13. If the system fault still persists
,
contact your
local AERCO representative for further
assistance.
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 ...
