pressure problems with york

[ironpit]

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?

[Six]

Liquid line drier restriction.

[Six]

Might be in the Condenser.

[ironpit]

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

[Snapperhead]

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

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.

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

[Huntinwalkerstyle]

Does the unit have a TXV at the evap coil. If it does try
Putting the bulb in hot water and check your pressures.

[Huntinwalkerstyle]

Please post what your findings were

[OldSchoolMech]

Low on Gas
Was the Blower working?

[rundawg]

Is there a drier hidden inside the OD unit ?

Yes there was one on the inside of these units when it came from the factory.

Whether or not it has been removed by some other tech, is another thing.

[Huntinwalkerstyle]

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.

[meh70087]

Your down stream of your restriction and probably low charge ! Look where the frost starts and there is your problem.

[ironpit]

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.

[ironpit]

no txv inside