Heat Pumps and Electric Heating - Honeywell RTH3100c with Heil heat pump

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larkspur57
10-24-09, 03:07 PM
Replacing a Carrier mercury switch thermostat (HH07AT215) with a Honeywell RTH3100C on a Heil heat pump model PHM330K00A1. Forgot to turn off all electrical power before disconnecting old thermostat wires. New thermostat is not working. It may be a fuse but do not know where it is on the unit. Any help would be appreciated.

Houston204
10-24-09, 08:17 PM
Turn off all breaker(s) to your unit and check in the blower access panel.

http://i151.photobucket.com/albums/s160/Houston204/HeilPHM.jpg
larkspur57
10-25-09, 09:56 AM
Found a 3.2 amp fuse part # HH832ZB001A. It is not a conventional fuse. It does not have an element that your can see is burned. I found a picture of the item on the web and the fuse in the picture is identical to how I found the fuse on the Heil unit. I do not think that it had popped.

Houston204
10-25-09, 11:08 AM
A continuity test would verify this. If you had a common wire in use on the old stat, it's probably the fuse though.

http://i151.photobucket.com/albums/s160/Houston204/FuseTraneAHU.jpg


Your new stat requires C (common)

http://i151.photobucket.com/albums/s160/Houston204/HoneywellRTH3100C.jpg



Color codes vary.
Does the fan run when you jumper R (24volt power) to G (fan) ?
larkspur57
10-25-09, 12:28 PM
No fan when jumping from R to G.

I had labeled the 6 wires that were on the old unit. I connected the wires to the corresponding connection on the new unit. The only difference is the W2 from the old unit is now AUX on the new unit as well as a jumper from AUX to E.
Houston204
10-25-09, 07:12 PM
Radioshack might have that fuse.
larkspur57
10-25-09, 08:45 PM
Thanks. I will check them out tomorrow.
larkspur57
10-26-09, 10:30 AM
The unit has 2 fuses. The second fuse is the blade type similar to what is used in autos. It was attached to one of the circuit boards and I did not notice it when I first looked. Fuse has been replaced and now have a working unit.

Thanks for all of your help.
Houston204
10-26-09, 05:50 PM
I recommend matching the amperage rating. Autozone has 3 and 5 amp blade type fuses for 3 bucks a pack. Circuit boards are much more. I'm glad that you now have a working unit:thumbup: