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No AC functions18-5 to Tstat and an 18-2 to compressor sprintgeek 05-28-2007
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Posted by on May 28, 2007, 10:39 am
I have about a 3 year old Kenmore (Sears) 6 ton HVAC that was in my
house when I bought it. The Thermostat was the cheapest digital I
have ever seen, so I replaced it with a programmable one to save a bit
on the heating and cooling.
The 18-5 tstat wire was also just run on the wall and stapled and
painted over, so I purchased a new wire an ran it inside the wall. I
have them hooked up as follows on both ends (tstat and circuit board)
r = red
c = blue
w = white
y = yellow
g = green

This worked all winter just fine, but apparently the cooling side is
not functioning as I have no A/C, or even fan when in AC mode. I have
verrified power to the blower and the compressor.

There is also an 18-2 lead going to the compressor's exterior power
breaker from the circuit board. I believe it was hooked up as
follows:
c = red
y = white

I have hooked it up in the same fashion to no avail. I believe the Y
is to trigger the compressor and the C is a common AC trigger lead.

What am I missing?

Thanks in advance for your response


Electric Radiant Heat 468x60
Posted by Noon-Air on May 28, 2007, 11:02 am

>I have about a 3 year old Kenmore (Sears) 6 ton HVAC that was in my
> house when I bought it. The Thermostat was the cheapest digital I
> have ever seen, so I replaced it with a programmable one to save a bit
> on the heating and cooling.
> The 18-5 tstat wire was also just run on the wall and stapled and
> painted over, so I purchased a new wire an ran it inside the wall. I
> have them hooked up as follows on both ends (tstat and circuit board)
> r = red
> c = blue
> w = white
> y = yellow
> g = green
>
> This worked all winter just fine, but apparently the cooling side is
> not functioning as I have no A/C, or even fan when in AC mode. I have
> verrified power to the blower and the compressor.
>
> There is also an 18-2 lead going to the compressor's exterior power
> breaker from the circuit board. I believe it was hooked up as
> follows:
> c = red
> y = white
>
> I have hooked it up in the same fashion to no avail. I believe the Y
> is to trigger the compressor and the C is a common AC trigger lead.
>
> What am I missing?

A phone call to a local tech



Posted by on May 28, 2007, 11:16 am

> I have about a 3 year old Kenmore (Sears) 6 ton HVAC that was in my
> house when I bought it. The Thermostat was the cheapest digital I
> have ever seen, so I replaced it with a programmable one to save a bit
> on the heating and cooling.
> The 18-5 tstat wire was also just run on the wall and stapled and
> painted over, so I purchased a new wire an ran it inside the wall. I
> have them hooked up as follows on both ends (tstat and circuit board)
> r = red
> c = blue
> w = white
> y = yellow
> g = green
>
> This worked all winter just fine, but apparently the cooling side is
> not functioning as I have no A/C, or even fan when in AC mode. I have
> verrified power to the blower and the compressor.
>
> There is also an 18-2 lead going to the compressor's exterior power
> breaker from the circuit board. I believe it was hooked up as
> follows:
> c = red
> y = white
>
> I have hooked it up in the same fashion to no avail. I believe the Y
> is to trigger the compressor and the C is a common AC trigger lead.
>
> What am I missing?


A working air conditioning system?




Posted by Tony on May 28, 2007, 11:18 am
PUT OLD ONE BACK IN IT WILL WORK


>I have about a 3 year old Kenmore (Sears) 6 ton HVAC that was in my
> house when I bought it. The Thermostat was the cheapest digital I
> have ever seen, so I replaced it with a programmable one to save a bit
> on the heating and cooling.
> The 18-5 tstat wire was also just run on the wall and stapled and
> painted over, so I purchased a new wire an ran it inside the wall. I
> have them hooked up as follows on both ends (tstat and circuit board)
> r = red
> c = blue
> w = white
> y = yellow
> g = green
>
> This worked all winter just fine, but apparently the cooling side is
> not functioning as I have no A/C, or even fan when in AC mode. I have
> verrified power to the blower and the compressor.
>
> There is also an 18-2 lead going to the compressor's exterior power
> breaker from the circuit board. I believe it was hooked up as
> follows:
> c = red
> y = white
>
> I have hooked it up in the same fashion to no avail. I believe the Y
> is to trigger the compressor and the C is a common AC trigger lead.
>
> What am I missing?
>
> Thanks in advance for your response
>



Posted by on May 28, 2007, 11:39 am
WOW! Great help! Thanks!

Has anyone seen an 18-5 to tstat and an 18-2 to the compressor comming
off the same 5 lead panel?


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