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Posted by Telstra on May 19, 2008, 5:19 pm
To resolve the question as to the true 24V Active
put the wire to the R terminal on G and the wire
to the G terminal on R. and test the thermostat
> Cycling the system
> Connecting R 24V Active from the transformer to the
> G Fan relay Y Compressor relay or W Heating relay
> will energise these relays regardless of the thermostat
> setting. If this does not occur then R is really Gand G
> R. That is the wire to G is really the 24V active and
> the wire to R is from the fan relay.
> However if it does work correctly then the thermostat
> wiring is correct and the fault is in the Indoor Unit
> either the transformer or the wiring. My guess is the
> wiring, perhaps a loose or burnt wire.
> The assumption of course is that the unit worked
> correctly when it was installed.
> However it appears that the fault is in the indoor unit
> wiring
> >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.
OK--when R jumpered to G, A/C unit fan AND indoor central fan
activates. As soon as jumper wire is removed, A/C unit fan stops.
Indoor fan continues operating. (with t'stat switches in "auto" and
"cool".
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Posted by randallbrink on May 21, 2008, 6:30 pm
> > Cycling the system
> > Connecting R 24V Active from the transformer to the
> > G Fan relay =A0Y =A0Compressor relay or W Heating relay
> > will =A0energise these relays regardless of the thermostat
> > setting. If this does not occur then R is really Gand G
> > R. That =A0is =A0the =A0wire to G is really the 24V active and
> > the wire to R is from the fan relay.
> > However if it does work correctly then the thermostat
> > wiring =A0is =A0correct =A0and =A0the =A0fault =A0is in the Indoor Unit
> > either =A0the =A0transformer =A0or =A0the wiring. My guess is the
> > wiring, perhaps =A0a loose or burnt wire.
> > The =A0assumption =A0of =A0course =A0is =A0that =A0the =A0unit worked
> > correctly when it was installed.
> > However it appears that the fault is in the indoor unit
> > wiring
> > >I have a puzzling problem. =A0When I select "Cool" on my thermostat, th=
e
> > > central fan does not come on, and so, while theairconditioner
> > > outside runs, it quickly freezes, as there is noairmovement. =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.
> OK--when R jumpered to G, A/C unit fan AND indoor central fan
> activates. As soon as jumper wire is removed, A/C unit fan stops.
> Indoor fan continues operating. (with t'stat switches in "auto" and
> "cool".
I just wanted to say "Thanks!" to everyone who helped during this
situation. As it turns out, the central fan was incorrectly wired at
the furnace circuit board, and once that was corrected, the air
conditioning now works fine.
I appreciate all the advice.
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Posted by Mikepier on May 21, 2008, 7:37 pm
> > > Cycling the system
> > > Connecting R 24V Active from the transformer to the
> > > G Fan relay =A0Y =A0Compressor relay or W Heating relay
> > > will =A0energise these relays regardless of the thermostat
> > > setting. If this does not occur then R is really Gand G
> > > R. That =A0is =A0the =A0wire to G is really the 24V active and
> > > the wire to R is from the fan relay.
> > > However if it does work correctly then the thermostat
> > > wiring =A0is =A0correct =A0and =A0the =A0fault =A0is in the Indoor Uni=
t
> > > either =A0the =A0transformer =A0or =A0the wiring. My guess is the
> > > wiring, perhaps =A0a loose or burnt wire.
> > > The =A0assumption =A0of =A0course =A0is =A0that =A0the =A0unit worked
> > > correctly when it was installed.
> > > However it appears that the fault is in the indoor unit
> > > wiring
.
> > > >I have a puzzling problem. =A0When I select "Cool" on my thermostat, =
the
> > > > central fan does not come on, and so, while theairconditioner
> > > > outside runs, it quickly freezes, as there is noairmovement. =A0On t=
he
> > > > other hand, if I select the heat-cool switch to "Off" and turn the f=
an
> > > > "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.
> > OK--when R jumpered to G, A/C unit fan AND indoor central fan
> > activates. As soon as jumper wire is removed, A/C unit fan stops.
> > Indoor fan continues operating. (with t'stat switches in "auto" and
> > "cool".
> I just wanted to say "Thanks!" to everyone who helped during this
> situation. =A0As it turns out, the central fan was incorrectly wired at
> the furnace circuit board, and once that was corrected, the air
> conditioning now works fine.
> I appreciate all the advice.- Hide quoted text -
> - Show quoted text -
So how was it incorrectly wired? Did someone else mess with the
furnace?
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Posted by randallbrink on May 22, 2008, 11:33 am
> > > > Cycling the system
> > > > Connecting R 24V Active from the transformer to the
> > > > G Fan relay =A0Y =A0Compressor relay or W Heating relay
> > > > will =A0energise these relays regardless of the thermostat
> > > > setting. If this does not occur then R is really Gand G
> > > > R. That =A0is =A0the =A0wire to G is really the 24V active and
> > > > the wire to R is from the fan relay.
> > > > However if it does work correctly then the thermostat
> > > > wiring =A0is =A0correct =A0and =A0the =A0fault =A0is in the Indoor U=
nit
> > > > either =A0the =A0transformer =A0or =A0the wiring. My guess is the
> > > > wiring, perhaps =A0a loose or burnt wire.
> > > > The =A0assumption =A0of =A0course =A0is =A0that =A0the =A0unit worke=
d
> > > > correctly when it was installed.
> > > > However it appears that the fault is in the indoor unit
> > > > wiring
...
> > > > >I have a puzzling problem. =A0When I select "Cool" on my thermostat=
, the
> > > > > central fan does not come on, and so, while theairconditioner
> > > > > outside runs, it quickly freezes, as there is noairmovement. =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 t=
he
> > > > > Heat-Cool switch to "Cool" the fan shuts off. =A0I have replace th=
e
> > > > > thermostat, and have the same problem.
> > > > > Any help will be greatly appreciated, as the outdoor temperature i=
s
> > > > > now 90F.
> > > OK--when R jumpered to G, A/C unit fan AND indoor central fan
> > > activates. As soon as jumper wire is removed, A/C unit fan stops.
> > > Indoor fan continues operating. (with t'stat switches in "auto" and
> > > "cool".
> > I just wanted to say "Thanks!" to everyone who helped during this
> > situation. =A0As it turns out, the central fan was incorrectly wired at
> > the furnace circuit board, and once that was corrected, the air
> > conditioning now works fine.
> > I appreciate all the advice.- Hide quoted text -
> > - Show quoted text -
> So how was it incorrectly wired? Did someone else mess with the
> furnace?
It was incorrectly wired in that the fan speed switch was wired to
high speed, but the central fan is only single speed. It appeared to
have been wired that way when the unit was installed.
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Posted by M Q on May 19, 2008, 5:47 pm
randallbrink wrote:
> 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.
>
>
On many furnaces, the fan speed for A/C is different (and higher) than
the fan speed for heating or for thermostat "Fan". The problem could
well be in the furnace (where your fan is). It could be the higher
speed winding on the motor is open, the connection to that winding
is open, or there is a problem with the relay in the furnace that
controls the fan. Contrary to the diagram on page 16 of the pdf
for the outdoor unit, the "Y" wire often goes to the furnace and is
used by the furnace to turn on the fan and select the speed.
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> Connecting R 24V Active from the transformer to the
> G Fan relay Y Compressor relay or W Heating relay
> will energise these relays regardless of the thermostat
> setting. If this does not occur then R is really Gand G
> R. That is the wire to G is really the 24V active and
> the wire to R is from the fan relay.
> However if it does work correctly then the thermostat
> wiring is correct and the fault is in the Indoor Unit
> either the transformer or the wiring. My guess is the
> wiring, perhaps a loose or burnt wire.
> The assumption of course is that the unit worked
> correctly when it was installed.
> However it appears that the fault is in the indoor unit
> wiring