High Side Pressure 375+

[eddy25]

I just got back into the business after four years in the Marine Corps. Before I went in I did alot of service on Furnaces but not to much on A/C

My question, I was servicing an GE condensing unit today. I put my gauges on and started up the unit, it ran for about 30 seconds before the high side temp got to about 375 and it shut itself off. Any suggestions on what could be the problem? Suction side was 65.

Model number TA942H1A
Serial number 214006836

I thought it was an airflow problem, I cleaned the condesing unit and changed the filter and still had the same problem. Thanks for the help.

[dnt]

eddy let me be the first to say thanks for your service to our country and welcome back. On your condensor problem if you have eliminated airflow across the condensing coil as the problem then immediatley check the airflow across the evaporator after that has been eliminated do a superheat and subcooling test and post results. You may have inherited a system that has low evap airflow and has been severly overcharged by someone trying to get the low side up or you could have a high side restriction. Is this a TXV or fixed orfice expansion device type system?

[dmoneyc22]

take a look at the age ge??
cap tube distrabution??

[eddy25]

Thank you all

The current home owner has been in the house for over 22 years and the unit was there when he bought the place.

[beenthere]

Restriction some where.

Bet some one pumped gas in it last year till it cooled again, and now you got the headache.

[eddy25]

After I decide air flow over evap and condensor is good should I just recover the refrigerant, put into vacuum and charge the system myself?

[dmoneyc22]

theres a lot more than that to do

[beenthere]

Gotta find the restriction, and fix that before recharging.

Disconnect the indoor blower and run the unit, and watch the frost.

[eddy25]

The unit only runs for about 30 to 45 seconds before it shuts off at 375 on high side

[hvac-tech-lane]

How much subcooling? You've got to have that number to tell anything. Pull a little ref if necessary to keep unit running for reading.

[eddy25]

I will try these things tomorrow, thank you all again for the help. I will post results