On 8/23/2010 2:18 PM, Colbyt wrote:
wrote in message
...
On Aug 23, 12:55 pm, wrote:
On Aug 23, 1:35 pm, wrote:


- Show quoted text -

The air handler does work, and when I push in the relay on the outside
compressor unit it runs, so I guess next I check for 24v to the
compressor relay?

The only thing controlling the 24 volt system before it gets to the outside
unit is thermostat. Are you sure it is good? Find the two wire cable and
test for 24V there first.

Many of the 1995 and later models have a low pressure switch wired into the
24 volt system inside the condenser unit. This part might also be the
problem. Just mentioning these two things BEFORE you run out and buy a
non-returnable contactor.

Follow the 24V wires and test for current after each part. Entry point, low
pressure switch and at the contactor. Actually working that in reverse is
the smarter way to do it. I just wanted you to see the path.



He did mention that it's a 13 SEER unit and it may very well have a low
pressure cutout switch. The builder grade units, even the newest of them
don't have a factory installed low or high pressure cutout.

TDD