Air Conditioning/Thermostat Selection

Posted by randallbrink on May 18, 2008, 4:58 pm

> randallbrink wrote:

> >>randallbrink wrote:
> >>>>If =A0( R ) on the indoor unit is connected to ( G ) on =A0the thermos=

tat

> >>>>and =A0( G ) on the indoor unit is connected to =A0( R ) thermostat th=

> >>>>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 fa=

> >>>>>"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. =A0And still, when I turn the "Heat-Cool"
> > switch "Off" and move the fan switch from "Auto" to "On" the fan comes
> > on. =A0If 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/

Well, I've already installed a new thermostat, and still have the same
symptoms. Odds are not good that two new thermostats would be faulty.

Posted by Telstra on May 17, 2008, 9:26 pm

1- Check the Wire link R to Ro is inserted

2- Check fan setting switch set to F

3-Put the wire going to G on the thermostat to the R
Terminal on the thermostat so the R terminal has
two wires R and G ( The fan should run without )
changing the thermostat switch )

>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, 9:58 pm

> 1- Check the Wire link R to Ro is inserted
> 2- Check fan setting switch set to F
> 3-Put the wire going to G on the thermostat to the R
> =A0 =A0Terminal on =A0the =A0thermostat =A0so the R terminal has
> =A0 =A0 two wires R and G ( The fan should run without )
> =A0 =A0 changing the thermostat switch )"randallbrink" <randallbr...@gmail=
.com> wrote in message

> >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.

Will do. Thanks!

Posted by Telstra on May 17, 2008, 10:11 pm

Cycling the system

Make up a jumper wire one foot long - bare a 1/4 inch at
each end.
1 Bridge R to G Fan should run
2 Bridge R to Y cooling should start after timer delay
3 Bridge R to W Heating
24 V is a low voltage however care should be taken
R is the 24V Active which is switched by the Stat to
Outputs G + Y ( Cooling ) G + W ( Heating ) G Fan

> 1- Check the Wire link R to Ro is inserted
> 2- Check fan setting switch set to F
> 3-Put the wire going to G on the thermostat to the R
> Terminal on the thermostat so the R terminal has
> two wires R and G ( The fan should run without )
> wrote in message

> >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.

Will do. Thanks!

Posted by randallbrink on May 17, 2008, 10:19 pm

> Cycling the system
> Make up a jumper wire one foot long - bare a 1/4 inch at
> each end.
> 1 Bridge R to G Fan should run
> 2 Bridge R to Y cooling should start after timer delay
> 3 Bridge R to W Heating
> 24 V is =A0a =A0low voltage =A0however =A0care should be taken
> R is =A0the =A024V Active which is switched by the =A0Stat to
> Outputs G + Y =A0( Cooling ) =A0G + W ( Heating ) G Fan

> > 1- Check the Wire link R to Ro is inserted
> > 2- Check fan setting switch set to F
> > 3-Put the wire going to G on the thermostat to the R
> > Terminal on the thermostat so the R terminal has
> > two wires R and G ( The fan should run without )
> > wrote in message

> > >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.

> Will do. =A0Thanks!

OK, will try it.

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Air Conditioning/Thermostat Selection - Page 4