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Airhandler on continuously / compress not coming on

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Airhandler on continuously / compress not coming on nowhere 07-20-2006
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Posted by on July 20, 2006, 11:36 pm
Help! I have a roof mounted heat pump system. It had a pretty much
broken honeywell mechanical thermostat installed but had the following
symptoms:

In order to get the compressor to kick on an cool, I had to crank the
thermostat down to the min and tap the mercury switch thingy at the end
of thermo spring to make sure it made good contact. The compressor then
comes on fine.

The air handler however won't turn off without cutting off the breaker.
I suspect the person who wired the thermostat didn't have any idea what
he was doing judging from some of the other wiring in the house.

My handyman tried to wire up a new digital thermostat first by matching
up colors (nothing worked) then by trying to determine what each wire
was for and hood them to the correct spot on the thermostat. We are now
in same the situation as with the mechanical. Airhandler runs
continuously, and the compress will not come on since I can't manually
ensure the connection is made as I could with the mechanical one.

I have read some stuff here that say if the air handler is running all
the time it might be a relay, or control board. Does wiring problems
seem more likely in this case? Is there a way to wire the thing to
produce the symptoms I am seeing?

Any help would be GREAT!

Thanks!


Posted by Al Moran on July 20, 2006, 11:43 pm
On 20 Jul 2006 20:36:34 -0700, nowhere@cox.net wrote:

>Help! I have a roof mounted heat pump system. It had a pretty much
>broken honeywell mechanical thermostat installed but had the following
>symptoms:
>
>In order to get the compressor to kick on an cool, I had to crank the
>thermostat down to the min and tap the mercury switch thingy at the end
>of thermo spring to make sure it made good contact. The compressor then
>comes on fine.
>
>The air handler however won't turn off without cutting off the breaker.
>I suspect the person who wired the thermostat didn't have any idea what
>he was doing judging from some of the other wiring in the house.
>
>My handyman tried to wire up a new digital thermostat first by matching
>up colors (nothing worked) then by trying to determine what each wire
>was for and hood them to the correct spot on the thermostat. We are now
>in same the situation as with the mechanical. Airhandler runs
>continuously, and the compress will not come on since I can't manually
>ensure the connection is made as I could with the mechanical one.
>
>I have read some stuff here that say if the air handler is running all
>the time it might be a relay, or control board. Does wiring problems
>seem more likely in this case? Is there a way to wire the thing to
>produce the symptoms I am seeing?
>
>Any help would be GREAT!
>
>Thanks!

First replace the thermostat, then the control board, then the
compressor, then the lineset, then the contactor, then the capacitor,
then the outdoor fan, then the indoor fan, then the heat exchanger,
then the evaporator coil. Finally, add 52 pounds of R503 to it. I
guarantee you this will fix it.

Posted by on July 21, 2006, 12:20 am

Al Moran wrote:
> On 20 Jul 2006 20:36:34 -0700, nowhere@cox.net wrote:
>

> First replace the thermostat, then the control board, then the
> compressor, then the lineset, then the contactor, then the capacitor,
> then the outdoor fan, then the indoor fan, then the heat exchanger,
> then the evaporator coil. Finally, add 52 pounds of R503 to it. I
> guarantee you this will fix it.

Well.... ok... ALMOST any help would be GREAT! ;)


Posted by Stormin Mormon on July 21, 2006, 9:48 am
Sure it wasn't 53 pounds of 502?

More seriously, read t he sheet that came with the thermostat. Should
be very, very helpful.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.


Al Moran wrote:
> On 20 Jul 2006 20:36:34 -0700, nowhere@cox.net wrote:
>

> First replace the thermostat, then the control board, then the
> compressor, then the lineset, then the contactor, then the
capacitor,
> then the outdoor fan, then the indoor fan, then the heat exchanger,
> then the evaporator coil. Finally, add 52 pounds of R503 to it. I
> guarantee you this will fix it.

Well.... ok... ALMOST any help would be GREAT! ;)



Posted by Noon-Air on July 21, 2006, 12:18 am

> Help! I have a roof mounted heat pump system. It had a pretty much
> broken honeywell mechanical thermostat installed but had the following
> symptoms:
>
> In order to get the compressor to kick on an cool, I had to crank the
> thermostat down to the min and tap the mercury switch thingy at the end
> of thermo spring to make sure it made good contact. The compressor then
> comes on fine.
>
> The air handler however won't turn off without cutting off the breaker.
> I suspect the person who wired the thermostat didn't have any idea what
> he was doing judging from some of the other wiring in the house.
>
> My handyman tried to wire up a new digital thermostat first by matching
> up colors (nothing worked) then by trying to determine what each wire
> was for and hood them to the correct spot on the thermostat. We are now
> in same the situation as with the mechanical. Airhandler runs
> continuously, and the compress will not come on since I can't manually
> ensure the connection is made as I could with the mechanical one.
>
> I have read some stuff here that say if the air handler is running all
> the time it might be a relay, or control board. Does wiring problems
> seem more likely in this case? Is there a way to wire the thing to
> produce the symptoms I am seeing?
>
> Any help would be GREAT!
>
> Thanks!

A "handy man" IS NOT an HVAC technician, nor is a a proctologist a dentist.
Call a *competent* HVAC tech to 1) correct all the problems 2) clean and
service the system, 3) correctly balance the refrigerant charge and finally
4) write you an invoice.




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