Trane Heat Pump Not Cooling
Posted 04 August 2006 - 03:45 PM
The unit was installed in 1990, but the compressor was replaced in 1995.
The filter was moderately dirty, but less than six weeks old (we do have hardwood floors which causes it to get dirty quicker.) I replaced the filter.
The evap coil IS NOT frozen.
I have cleaned the evap coil within the year.
In the past when the filter was a bit dirty the evap coils would freeze up.
The evap coils seem to freeze up more often as time goes by.
The compressor fan runs.
At first the compressor was not on, but after the unit was off for an hour IT CAME BACK ON when re-powered.
There is no condensatiobn on the return (?) line (the insulated one)
The supply line does not get warm (small line without insulation.)
The air blowing out from the condensor unit is not hot
When the compressor ran for a short while the other line (bigger and insulated) felt a bit warm. It should be the oposite in the coolng mode corrct?
The compressor sounds normal.
After opening the outside unit and cleaning the coils the compressor came on when the unit was re-energized, but the fan cycles off and on. The fan runs for :30 seconds, shuts off for five seconds, then re-starts and runs another :30 seconds. the compressor stays on.
I didn't run it more than a few minutes like this.
Low refridgerant level?
If the compressor runs isn't it "OK"?
I have the disconnect "off" right now.
The unit was cooling fine as of this morning.
This sounds stupid, but my electric usage seems to be higher.
Is the unit working harder due to a low freon level?
Posted 05 August 2006 - 01:14 AM
Posted 05 August 2006 - 08:11 AM
HVAC repairman came by:
There seems to be a restriction in the (low pressure?) line.
The side that should read 70 (psi?) is low (40-ish?)
He didn't have a .60 orifice and would need his evacuation system as well.
He is coming back late Monday or early Tuesday.
It appears that the compressor is working, but he said that it could be a part from it that has caused the restriction. In other words... the compressor could be failing. YIKES!
He said that the coils could be coming apart? Somthing about a plastic somthing or other inside the compressor that can touch something and cause it to go to GND? If it goes to GND it burns up the coolant as I understand it?
The compressor's automatic shut-off is turning the compressor off after a while due to the pressure imbalance.
To add to the fun, when he was un-hooking his gauges the Schrader valve stuck open!
He had to put the cap on to stop it.
That'll be one more thing to replace!
Posted 15 August 2006 - 07:09 PM
Posted 16 August 2006 - 05:13 PM
I'd need to know more about the system, but A restriction will cause a low suction pressure, a high high side pressure and may show frosting at the restiction site. My gut feeling is a control problem (IE: a pressure switch, defrost control or the like.)
The fan cycling almost seems like it was trying to force a defrost.
"The answer is that.......wait...what was the question again?"
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