AC condensing unit problem

Posted by JackpipE on June 21, 2008, 10:12 am

I took the condensing unit apart and follow the 24V blue wire inside
the unit. As you can see on this picture:
http://e-pixel.net/AC_condensing_unit_inside.jpg
the blue 24V first goes into the "red thing" (don't know what it is)
and then it goes into the green thing. When it comes out, there is no
voltage on the wire. There is voltage (27V) when it comes out of the
red and changes from blue to yellow wire but no voltage coming out
from the green thing.

What is the red and green ? how can I replace it as it seems to be
permanently attached to the pipe?

The yellow wire that comes out of the green goes to T1 on the
electronic board: http://e-pixel.net/AC_condensing_unit.jpg. The
other
24V is on T3.
So I have no voltage on the electronic board. Can I skip the green
and
red parts inside the unit and connect the 24V wire directly to T1 on
the board?

Jack

Posted by J.H. Holliday on June 21, 2008, 10:27 am

>I took the condensing unit apart and follow the 24V blue wire inside
> the unit. As you can see on this picture:
> http://e-pixel.net/AC_condensing_unit_inside.jpg
> the blue 24V first goes into the "red thing" (don't know what it is)
> and then it goes into the green thing. When it comes out, there is no
> voltage on the wire. There is voltage (27V) when it comes out of the
> red and changes from blue to yellow wire but no voltage coming out
> from the green thing.
> What is the red and green ? how can I replace it as it seems to be
> permanently attached to the pipe?
> The yellow wire that comes out of the green goes to T1 on the
> electronic board: http://e-pixel.net/AC_condensing_unit.jpg. The
> other
> 24V is on T3.
> So I have no voltage on the electronic board. Can I skip the green
> and
> red parts inside the unit and connect the 24V wire directly to T1 on
> the board?
> Jack

Why did you take it apart-- was the system working? If not, what were the
symptoms?

Posted by Moe Jones on June 21, 2008, 11:02 am

JackpipE wrote:

> I took the condensing unit apart and follow the 24V blue wire inside
> the unit. As you can see on this picture:
> http://e-pixel.net/AC_condensing_unit_inside.jpg the blue 24V first
> goes into the "red thing" (don't know what it is)
> and then it goes into the green thing. When it comes out, there is no
> voltage on the wire. There is voltage (27V) when it comes out of the
> red and changes from blue to yellow wire but no voltage coming out
> from the green thing.
> What is the red and green ? how can I replace it as it seems to be
> permanently attached to the pipe?
> The yellow wire that comes out of the green goes to T1 on the
> electronic board: http://e-pixel.net/AC_condensing_unit.jpg. The
> other
> 24V is on T3.
> So I have no voltage on the electronic board. Can I skip the green
> and
> red parts inside the unit and connect the 24V wire directly to T1 on
> the board?
> Jack

1. First shut down the 24v power to the condensing unit.
2. Cut the wires going to # 2 pressure switch about 6" to 8" from the switch
and tie them together to bypass the switch.
3. Turn power back on and see if it works then turn back off.
4. If it does then find why the switch was blocking power. Could the switch
be defective or has it sensed defective pressures?
5. If you are not sure what to do then find a HVAC person that knows what
they are doing so you don't do anymore damage to your A/C.

--
Moe Jones
http://www.MoeJones.info

Posted by JackpipE on June 22, 2008, 4:58 pm

> 1. First shut down the 24v power to the condensing unit.
> 2. Cut the wires going to # 2 pressure switch about 6" to 8" from the switch
> and tie them together to bypass the switch.
> 3. Turn power back on and see if it works then turn back off.
> 4. If it does then find why the switch was blocking power. Could the switch
> be defective or has it sensed defective pressures?
> 5. If you are not sure what to do then find a HVAC person that knows what
> they are doing so you don't do anymore damage to your A/C.

I eliminated the pressure switch #2 and it did work.
1. Can I run the system without the switch for now?
2. Are the switches replaceable as it seems to be installed there
permanently (from what I can tell).
3. As Moe mentioned, could there be a defective pressure the would not
let the voltage through the switch?

Thanks,
Jack

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