pressure problems with york
Went out on a york call today. With unit off pressures read, lo 28 & hi 58. It was about 85 out. Started the unit up and the liquid line started to freeze all the way to the evap coil.
I shot some r22 in and the liquid line thawed out immediately. Unit was blowing off plenty of heat but pressures would not seperate. There was about 20 degrees difference. I stopped adding r22 and the pressure started dropping, as if a major leak.
I pull the disconnect to listen for a leak. No leak outside. The pressures had dropped to about 28 lo, & 48 hi, just before pulling the disconnect.
After the disconnect was pulled , the pressures rose to 151 lo & 161 hi.
I reinserted the disconnect and the pressure pulled down to 50 lo & 73 hi, in just about 3 minutes.
The compressor was having some trouble, kind of like shuddering just a little, a couple of times.
The o.s. unit is a york stellar series s# wfnm026603, m# h4db030s06a.
The inside coil was a s# efws305045, m# g-ut037sa, central cooling.
What is going on?
Liquid line drier restriction.
Might be in the Condenser.
I wondered about that, but the line froze from the service valve all the way to the coil. I expected just the point of blockage to freeze quickly, but the whole line did. thanks
one thing i notice , i think one of your guages are off . Hook up the low side to a jug of 22 or whatever you have , then your high , and make sure they read the same.
Originally Posted by ironpit
Look at a pressure / temp chart and see how much psi the jug should be at.
2nd .... the unit was almost completely empty when u arrived ... maybe had half a pound in it.
3rd ... if you only got 73 psi on the high side , you may have a junk compressor , or a big time restriction.
Throw your amp meter on
Is there a drier hidden inside the OD unit ?
4th .... make sure both service port king valves are open. Get out your allen wrench and verify.
If both were indeed all the way open , then lets do a simple compressor test , close the high side king valve , crank her up , and make sure the low side can pull down to 0
If it does , then atleast ur compr has a potential to be repaired
Indoor fan is working correct ?
Lotts of air comming out vents ?
Report back with your findings
Yes there was one on the inside of these units when it came from the factory.
Originally Posted by Snapperhead
Whether or not it has been removed by some other tech, is another thing.
Instead of learning the tricks of the trade, learn the trade.
Does the unit have a TXV at the evap coil. If it does try
Putting the bulb in hot water and check your pressures.
Please post what your findings were
Low on Gas
Was the Blower working?
Take the bulb loose from the suction line and stick it in hot water. This will open the TXV wide open and your pressure should come up.
Your down stream of your restriction and probably low charge ! Look where the frost starts and there is your problem.
I put a new filter on, arrow pointing inside. Pulled a vacuum to below 500 microns, released the refrigerant (r22) and inserted the disconnect. The condenser fan came on immediately, the compressor came on about 7 minutes later.
I had checked the values on the 35/5 cap. They were 34.8 and 5.0.
The pressures were equal until the compressor came on. at first they rose, then they started dropping , maintaining about 20 psig apart until I pulled the disconnect.
At first the unit was putting out a lot of heat, decreasing as the pressures dropped.
The blower was putting out plenty of air.
This time the liquid line did not attempt to freeze or sweat.
Last edited by ironpit; 07-13-2012 at 06:53 PM.
Reason: no cabinet filter