The feedback that I got from this site regarding static pressure and return duct sizing last year was a great help. When the owner of the company that installed the unit came out and I reviewed the feedback from this site and the static pressure readings that I had taken, he said that the feedback was exactly right and he had a crew back out here the next day to correct the undersized return duct. Thanks!
We've got a 94 mobile home on our farm for our farm help.
The blower motor stopped running yesterday. I removed the cover from the AHU compartment, and it appeared that the heating elements were heating up, but the blower would not start. There was just a slight hum from the blower motor. I turned the switch on the T-stat to fan, and no fan. Also turned the rocker switch at the unit from auto to fan and no fan. Turned the power off to the unit and built a fire in the wood stove.
I started to try and check the unit out today, and the fan ran fine.
Turned the heat on, heard the click of the relay and a few seconds later the fan came on in low. When the T-stat was satisfied, the heating elements clicked off and a little while later the blower turned off.
I turned the T-stat to fan. The fan came on in high.
I turned the rocker switch at the unit to on, and the fan came on in high.
Nordyne/Intertherm Electric furnace:
Model: FEBB-015HASerial: FEB9403-05742"Multi-Speed Motor 3.0 FLA 1/3 HP"
Black - Hi
Blue - Med Hi
Yellow - Med Lo
Red - Lo
The red and green wires are not used and are wire capped off.
Black wire to orange wire: 9.8 (on 200 ohm scale)
Black wire to yellow wire: 7.7 (on 200 ohm scale)
Orange wire to yellow wire: 8.2 (on 200 ohm scale)
The orange wire is connected to a device that projects into the heating element chamber (limit switch I assume).
The yellow and black wire are hooked to different terminals on a black plastic device mounted inside the wiring compartment (sequencer?).
The T-stat terminals on the blower assembly are not used. The quick disconnects are not used either. Everything inside the electric compartment on the blower assembly have been abandoned in place. All wiring connections are with wire nuts.
I'm going to clean up the blower and oil the motor.
Any idea what is causing the intermittent problem with the blower?
If it might be the T-stat, I still have the original Intertherm T-stat and could put that back on, but it has been on for a while and was working fine.
I would like to add a T-stat that has a circulate function that would run the blower on low speed periodically to circulate the heat from the wood stove. Any suggestions on how to accomplish this?
Thanks in advance for helping with this problem.