Need Info or Manual To Troubleshoot Older Coleman AC/Furnace
Posted: Fri Nov 23, 2007 11:31 pm
Hello, your site looks like just the thing for depressing heaters. Hope you can sell me a part.
I am trying to figure out what is wrong with my Coleman Furnace in the typical Manufactured Home style cabinet. It is part of a combined AC & Heater unit. The unit is circa 1984.
Cooler/Blower unit works wells. Responds appropriately to thermostat. A new blower was installed a couple of years ago and the capaciters for both the air conditioner and blower were replaced about a year ago. This is thunderstorm country and I think that the lightning transients finally did them in, plus old age and a lot of use here in Arizona.
Heater does not work, no response to thermostat settings, blower will not turn on when set to AUTO.
Blower can be manually turned on at thermostat but no heat is provided.
I have removed the panels and am trying to figure out how to troubleshoot. One furnace man told me over the phone that it was probably the "sequencer". He had me come to his shop and tried to sell me a part but it did not look like the sequencer in the unit. Not knowing about these parts, I declined.
Is there a manual of operation - laying out the principles of operation and control - available for these type of heaters? This might help me troubleshoot the unit to determine absolutely that the problem is that I need a new sequencer. I am looking specifically for something which lays out the behaviors and signals I can monitor electrically to see what is going on. I have no problem working safely on high energy circuits, I used to be a radar technician. I just don't know a thing about these types of AC units.
I DO NOT NEED WIRING DIAGRAMS.....have the original set which came with this manufactured house.
Specs for the system:
Air Conditioner Cooler/Heater
Coleman Central Electric Furnace
Serial 108473080
Model 3400-818
240 VAC/60/1
16.92 KW / 70.5 Amps
Heating Coil Assembly
w/3 limit switches 3400-336
Sequencer - mounts separately
apparently part number is 3400-357 (read from the part mounting plate)
Michael Mandeville
623-374-9585
mwman@earthlink.net
I am trying to figure out what is wrong with my Coleman Furnace in the typical Manufactured Home style cabinet. It is part of a combined AC & Heater unit. The unit is circa 1984.
Cooler/Blower unit works wells. Responds appropriately to thermostat. A new blower was installed a couple of years ago and the capaciters for both the air conditioner and blower were replaced about a year ago. This is thunderstorm country and I think that the lightning transients finally did them in, plus old age and a lot of use here in Arizona.
Heater does not work, no response to thermostat settings, blower will not turn on when set to AUTO.
Blower can be manually turned on at thermostat but no heat is provided.
I have removed the panels and am trying to figure out how to troubleshoot. One furnace man told me over the phone that it was probably the "sequencer". He had me come to his shop and tried to sell me a part but it did not look like the sequencer in the unit. Not knowing about these parts, I declined.
Is there a manual of operation - laying out the principles of operation and control - available for these type of heaters? This might help me troubleshoot the unit to determine absolutely that the problem is that I need a new sequencer. I am looking specifically for something which lays out the behaviors and signals I can monitor electrically to see what is going on. I have no problem working safely on high energy circuits, I used to be a radar technician. I just don't know a thing about these types of AC units.
I DO NOT NEED WIRING DIAGRAMS.....have the original set which came with this manufactured house.
Specs for the system:
Air Conditioner Cooler/Heater
Coleman Central Electric Furnace
Serial 108473080
Model 3400-818
240 VAC/60/1
16.92 KW / 70.5 Amps
Heating Coil Assembly
w/3 limit switches 3400-336
Sequencer - mounts separately
apparently part number is 3400-357 (read from the part mounting plate)
Michael Mandeville
623-374-9585
mwman@earthlink.net