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Air Conditioning/Thermostat Selection randallbrink 05-16-2008
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Posted by Telstra on May 17, 2008, 6:22 pm
If ( R ) on the indoor unit is connected to ( G ) on the thermostat
and ( G ) on the indoor unit is connected to ( R ) thermostat then
with the fan on it would connect G to R and with the cooling on R
to ( Y ) with ( G ) OFF

Check the wire colour on the indoor Unit R - Y - W - G and make
sure these are connected to the right thermostat terminals

>I have a puzzling problem. When I select "Cool" on my thermostat, the
> central fan does not come on, and so, while the air conditioner
> outside runs, it quickly freezes, as there is no air movement. On the
> other hand, if I select the heat-cool switch to "Off" and turn the fan
> "On" the fan works fine. But if while the fan is running, I move the
> Heat-Cool switch to "Cool" the fan shuts off. I have replace the
> thermostat, and have the same problem.
>
> Any help will be greatly appreciated, as the outdoor temperature is
> now 90F.
>
>


Posted by randallbrink on May 17, 2008, 7:21 pm
> If =A0( R ) on the indoor unit is connected to ( G ) on =A0the thermostat
> and =A0( G ) on the indoor unit is connected to =A0( R ) thermostat then
> with the fan on it would connect G to R and with the cooling on R
> to ( Y ) with ( G ) OFF
>
> Check the wire colour on the indoor Unit R - Y - W - G and make
> sure these are connected to the right thermostat terminals
>
>
>
> >I have a puzzling problem. =A0When I select "Cool" on my thermostat, the
> > central fan does not come on, and so, while the air conditioner
> > outside runs, it quickly freezes, as there is no air movement. =A0On the=

> > other hand, if I select the heat-cool switch to "Off" and turn the fan
> > "On" the fan works fine. But if while the fan is running, I move the
> > Heat-Cool switch to "Cool" the fan shuts off. =A0I have replace the
> > thermostat, and have the same problem.
>
> > Any help will be greatly appreciated, as the outdoor temperature is
> > now 90F.

By "Indoor Unit" I assume you mean the furnace blower?

Posted by Nate Nagel on May 17, 2008, 7:29 pm
randallbrink wrote:
>
>>If ( R ) on the indoor unit is connected to ( G ) on the thermostat
>>and ( G ) on the indoor unit is connected to ( R ) thermostat then
>>with the fan on it would connect G to R and with the cooling on R
>>to ( Y ) with ( G ) OFF
>>
>>Check the wire colour on the indoor Unit R - Y - W - G and make
>>sure these are connected to the right thermostat terminals
>>
>>
>>
>>
>>>I have a puzzling problem. When I select "Cool" on my thermostat, the
>>>central fan does not come on, and so, while the air conditioner
>>>outside runs, it quickly freezes, as there is no air movement. On the
>>>other hand, if I select the heat-cool switch to "Off" and turn the fan
>>>"On" the fan works fine. But if while the fan is running, I move the
>>>Heat-Cool switch to "Cool" the fan shuts off. I have replace the
>>>thermostat, and have the same problem.
>>
>>>Any help will be greatly appreciated, as the outdoor temperature is
>>>now 90F.
>
>
> By "Indoor Unit" I assume you mean the furnace blower?

yes, that is correct (or air handler if you have a heat pump)

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel

Posted by randallbrink on May 17, 2008, 8:27 pm
> randallbrink wrote:
>
> >>If =A0( R ) on the indoor unit is connected to ( G ) on =A0the thermosta=
t
> >>and =A0( G ) on the indoor unit is connected to =A0( R ) thermostat then=

> >>with the fan on it would connect G to R and with the cooling on R
> >>to ( Y ) with ( G ) OFF
>
> >>Check the wire colour on the indoor Unit R - Y - W - G and make
> >>sure these are connected to the right thermostat terminals
>
>

>
> >>>I have a puzzling problem. =A0When I select "Cool" on my thermostat, th=
e
> >>>central fan does not come on, and so, while the air conditioner
> >>>outside runs, it quickly freezes, as there is no air movement. =A0On th=
e
> >>>other hand, if I select the heat-cool switch to "Off" and turn the fan
> >>>"On" the fan works fine. But if while the fan is running, I move the
> >>>Heat-Cool switch to "Cool" the fan shuts off. =A0I have replace the
> >>>thermostat, and have the same problem.
>
> >>>Any help will be greatly appreciated, as the outdoor temperature is
> >>>now 90F.
>
> > By "Indoor Unit" I assume you mean the furnace blower?
>
> yes, that is correct (or air handler if you have a heat pump)
>
> nate
>
> --
> replace "roosters" with "cox" to reply.http://members.cox.net/njnagel

All of the wiring seems to be correct in accordance with the
installation instructions. And still, when I turn the "Heat-Cool"
switch "Off" and move the fan switch from "Auto" to "On" the fan comes
on. If I put the fan switch on "Auto" and turn the AC to "Cool" the
AC fan comes on and cold air enters the building, but wothout the fan,
it does not move and the AC unit soon freezes up.


Posted by Tony Hwang on May 18, 2008, 12:19 am
randallbrink wrote:
>
>>randallbrink wrote:
>>
>>
>>>>If ( R ) on the indoor unit is connected to ( G ) on the thermostat
>>>>and ( G ) on the indoor unit is connected to ( R ) thermostat then
>>>>with the fan on it would connect G to R and with the cooling on R
>>>>to ( Y ) with ( G ) OFF
>>
>>>>Check the wire colour on the indoor Unit R - Y - W - G and make
>>>>sure these are connected to the right thermostat terminals
>>
>>
>>
>>>>>I have a puzzling problem. When I select "Cool" on my thermostat, the
>>>>>central fan does not come on, and so, while the air conditioner
>>>>>outside runs, it quickly freezes, as there is no air movement. On the
>>>>>other hand, if I select the heat-cool switch to "Off" and turn the fan
>>>>>"On" the fan works fine. But if while the fan is running, I move the
>>>>>Heat-Cool switch to "Cool" the fan shuts off. I have replace the
>>>>>thermostat, and have the same problem.
>>
>>>>>Any help will be greatly appreciated, as the outdoor temperature is
>>>>>now 90F.
>>
>>>By "Indoor Unit" I assume you mean the furnace blower?
>>
>>yes, that is correct (or air handler if you have a heat pump)
>>
>>nate
>>
>>--
>>replace "roosters" with "cox" to reply.http://members.cox.net/njnagel
>
>
> All of the wiring seems to be correct in accordance with the
> installation instructions. And still, when I turn the "Heat-Cool"
> switch "Off" and move the fan switch from "Auto" to "On" the fan comes
> on. If I put the fan switch on "Auto" and turn the AC to "Cool" the
> AC fan comes on and cold air enters the building, but wothout the fan,
> it does not move and the AC unit soon freezes up.
>
Hi,
Sounds like you have bad 'stat/

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