CPEV Problems

[Carlz0r]

Alright, so I finally got the leaky cpev fixed on a ss I was working on. I went to fire it up today and it tries to start but just cant handle it. I adjusted the cpev to allow more refrigerant through and then it started. While running, I slowly adjusted the cpev back to where it was the first time, and the compressor kept running perfectly. Anyone know why this is happening? My guess was that the 3-in-1 RCO I have isn't powerful enough for the compressor to start with that much restriction. Any insight would be great. Thanks.

[wdrzal]

Are you allowing time between starts and stops, for system to equilize??? a few minuites!!!!!

Do you have the compressor wired correctly???? What size valve and orfice are you using???

[Carlz0r]

Are you allowing time between starts and stops, for system to equilize??? a few minuites!!!!!

Do you have the compressor wired correctly???? What size valve and orfice are you using???
I wait for the pressures on my gauge to equalize before I start it again. It's a Parker A2 cpev with 1/8" feeder line to the evaporator. I have it wired exactly as it says on the RCO, but my guess on it was that it's just too weak. The compressor is a 1/3hp rotary.

[jinu117]

Manual bypass valve by anychance? I noticed it takes forever to equalize with CPEV :P

[Carlz0r]

Manual bypass valve by anychance? I noticed it takes forever to equalize with CPEV :P
Nope, no manual bypass valve. My quick way of equalizing it while just testing the compressor was opening the cpev a lot more. Did it pretty fast then.

[_HL4E_HalfLife_]

Is the compressor new or used?
Does the compressor have the right uf cap on it?
Is there a restriction in the line somewhere?


If you have a compressor wired right it and has just a run cap on it ,it should be able to start easily even if the suction/discharge pressures are off by 10 to 15psi.

[Carlz0r]

Compressor is wired exactly as it says on the RCO (Supco 3-in-1 thing), compressor is brand new. As for the cap uF, that's what I think may be the problem. It's not got enough capacitance to have it start after a certain amount of restriction has been reached on the cpev.

[_HL4E_HalfLife_]

Compressor is wired exactly as it says on the RCO (Supco 3-in-1 thing), compressor is brand new. As for the cap uF, that's what I think may be the problem. It's not got enough capacitance to have it start after a certain amount of restriction has been reached on the cpev.

Why are u using one of those 3 in 1 kits?? My guess is thats the problem... MAYBE. What you should do is try and wire up a run cap and see if that works. Start with 20uf 220v and if that don't work try 25uf 220v if that don't work ..etc..etc

Can you take a ss of the compressor/w label?

[Carlz0r]

Why are u using one of those 3 in 1 kits?? My guess is thats the problem... MAYBE. What you should do is try and wire up a run cap and see if that works. Start with 20uf 220v and if that don't work try 25uf 220v if that don't work ..etc..etc

Can you take a ss of the compressor/w label?
That's what I thought was the problem. The 3 in 1 was just to test it before I got the actual cap (I had a 3 in 1 laying around).

[_HL4E_HalfLife_]

That's what I thought was the problem. The 3 in 1 was just to test it before I got the actual cap (I had a 3 in 1 laying around).

Find the specs on the compressor and find out what uf run cap it should be.

[Carlz0r]

NoL would know, he has the same compressor.

[star882]

If you used a "packaged" starter, it might be junk. Buy some individual parts and make a starter.
http://www2.hvac-talk.com/vbb/showthread.php?threadid=103910

[n00b 0f l337]

You just need a 25uf start capacitor.

[_HL4E_HalfLife_]

You just need a 25uf start capacitor.

Start capacitors don't come with that low of a uf what he needs is a run capacitor.

A run capacitor stays energized the entire time the compressor is on which in turn lowers the amprage because it increases the torque. A start capacitor is only energized during the compressor startup than a relay or "switch" breaks the connection if it doesn't it will burnout the compressor in less than 1 minute (or pop the overload).

[n00b 0f l337]

Sorry thats what I meant.

[_HL4E_HalfLife_]

Sorry thats what I meant.

Im sure you did ;) :D