Roof top heat pump

[wardhillarch]

I have a single duo-therm roof top heat pump. It cools but no heat. Any ideas on why? Blower works fine
Thanks
Jeff
--
Jeffrey Fleming
1976 edgemonte
Living in Maine

 

[Matt Colie]

> I have a single duo-therm roof top heat pump. It cools but no heat. Any ideas on why? Blower works fine
> Thanks
> Jeff

Jeff,

First off, are you sure it is a Heat Pump?
Those have never been common, because the temperature band where they actually beat a resistance heater is so small.

If it cools but does not heat, then the only problem is with the "reversing valve" or its control. Now all you need is the documentation to figure
that out. One good thing is that the operating coil of the reversing valve is usually replaceable without opening the system.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit

 

[adolph santorine]

Thermostat or the wiring.

Most likely wiring.

Dolph Santorine

DE AD0LF

Wheeling, West Virginia

1977 ex-Palm Beach TZE167V100820
Howell EFI/EBL , Reaction Arms, Manny Transmission

>
> I have a single duo-therm roof top heat pump. It cools but no heat. Any ideas on why? Blower works fine
> Thanks
> Jeff
> --
> Jeffrey Fleming
> 1976 edgemonte
> Living in Maine
>
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[wardhillarch]

There are controls for heating and cooling. The manual says it does both . I'll look into you suggestion thanks for the responce
--
Jeffrey Fleming
1976 edgemonte
Living in Maine

 

[johnny]

I had one of those in the 23'. Useful to get the morning chill off but that's all, it shuts down completely at about 40 f. The function switch
failed on mine, I had to replace it with two switches. It puts six positions where the A/C alone has about 3 or so, at any rate this requires smaller
contacts which aren't as robust, and tend to corrode and fail.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell

 

[wardhillarch]

Who can service these an hvac company?
--
Jeffrey Fleming
1976 edgemonte
Living in Maine

 

[Matt Colie]

> Who can service these an hvac company?

Jeffery,

Any good HVAC tech can, most will not. The system is so small and so charge critical that the likelihood of success is not great. For that reason
alone they will try to not talk to you. If you start out by telling him that it cools, he will know that it is a valve problem and may be willing to
climb up and look at it.

Good Luck

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit

 

[mghamms]

are you sure its a heat pump.
It and most that I know of have a 120v resistance heating strip.
Yours migh just need that.
If so I think I have one in my junk pile.

--
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts

 

[Ken B]

Most of those have "optional" heat strips (basically resistance wire) that can be installed inside them rather than a true heat pump.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[Larry Davick]

Do you happen to have the model number?
--
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy