[pokoyo]

How do i know if the walk-in freezer is deffective?.. The compressor run in short cycle, its take 15 min run and then off,. its a l'unite compressor with sigth glass.. in suction line goes 50 psig and high side was 295 psig, when i've look into my clamp tester, its 12 amp.. the comp. motor was in heat, after 15 min it will automatocally off,.. as ive shut down the unit and check the comp pin,.. there is no reading in common to running.. refrigerant is 404a with tev filter and sight glass, someone told that we need to replace a compressor.. i been doubt about it, i rather check the compressor without refrigerant, then it run normally with 4 amp. anybody.. is a compressor was deffective or not?

 

[ryan79]

condenser clean ? what kind of condenser is this ? water or air cooled ?
sounds like the compressor is going off on overload.
Don't run a compressor with no refrigerant in the system. It requires the refrigerant to work properly.

 

[2sac]

Suction pressure is too high for a 404a freezer

 

[pokoyo]

condenser clean ? what kind of condenser is this ? water or air cooled ?
sounds like the compressor is going off on overload.
Don't run a compressor with no refrigerant in the system. It requires the refrigerant to work properly.

Sir, condenser was clean, ill brush it, this a air cooled condenser.. overload protector won't off, only the compressor, it will resume about an hour.. the fan still running..

 

[pokoyo]

Suction pressure is too high for a 404a freezer

Sir, its is possible that in the system was the problem?.. what is the normal suction pressure in freezer?

 

[ryan79]

Try to pump down the compressor. Turn it off once it is in a vacuum. Pressure should hold and not rise.

 

[The_Sale]

Sounds like bad valves to me.

 

[A.T]

Either suction valve is leaking or your compressor is undersizez

 

[pokoyo]

thank to you all guys, alot more things to learned from this site,

 

[rider77]

That's awful high head pressure. Are you a tech? Are there noncondensibles in the system?

 

[The_Sale]

+1

 

[Snapperhead]

checking a compressor is easy , close liquid valve , bypass low pressure switch if it has one , watch suction and see if it goes to 0 , then turn off compressor , suction should stay at 5 psi or close to it for a couple minutes

 

[primary mech]

suction pressure and discharge pressure are high. Did you remove the charge and run the compressor without refrigerant? I would check charge after checking if valves are good.

 

[pecmsg]

suction pressure and discharge pressure are high. Did you remove the charge and run the compressor without refrigerant? I would check charge after checking if valves are good.

Please show me where this is in any manual!

 

[primary mech]

Im not sure what to show you. My concern is it was either overcharged or there is now air in the system. As for it being overcharged see below article.
http://www.achrnews.com/articles/the-symptoms-of-refrigerant-overcharge

Please show me where this is in any manual!

 

[The_Sale]

Ha! Run it without refrigerant? Funny story, I rolled up on a bard unit that was running with 8" of the suction line missing. Scroll just chugging along.

 

[primary mech]

How do i know if the walk-in freezer is deffective?.. The compressor run in short cycle, its take 15 min run and then off,. its a l'unite compressor with sigth glass.. in suction line goes 50 psig and high side was 295 psig, when i've look into my clamp tester, its 12 amp.. the comp. motor was in heat, after 15 min it will automatocally off,.. as ive shut down the unit and check the comp pin,.. there is no reading in common to running.. refrigerant is 404a with tev filter and sight glass, someone told that we need to replace a compressor.. i been doubt about it, i rather check the compressor without refrigerant, then it run normally with 4 amp. anybody.. is a compressor was deffective or not?

Maybe I misunderstood the original post... if so my apologies. I was under the impression they tried to run it without refrigerant, I was not telling them to do so.

 

[Rhinohead]

I usually bump that to see if they pump if it's empty when i arrive.

Sent from my SCH-S738C using Tapatalk

 

[VTP99]

. there is no reading in common to running.

If you have no reading between RUN & COMMON it's time for a new compressor.