High pressure problem

[myhvacx]

Troubleshhoting a 10 to r22 system w reset switch, upon resetting it the pump turn on and high side hits 400psi in a few seconds then shuts off..

When it shuts off the txv valve makes a strong humming noise for a few seconds then stops... Could this be a bad txv?

[Mr Bill]

Troubleshhoting a 10 to r22 system w reset switch.

What is a 10 to R22 system?

[toocoolforschool]

I think he meant 10 ton r22 system.
Sounds like a ristriction of the collosal{big} type.

[VanIsleRefrig]

think he means 10 ton maybe. if you think it is the tx put the bulb in some warm water and see if that makes a difference. check for any visible kinks in line, possible plugged filter drier? how many "seconds" does it take

[VanIsleRefrig]

woops looks like im being a parrot

[myhvacx]

Five seconds , yes i meant 10 ton

[Push It]

it can't be the TXV. You would get more then 5 seconds of run time. And it would need to be overcharged, the unit should pump down and trip the low pressure before it trips the HP switch. Is it a tin can or semihermetic? Where is the pressure switch? Are there any service valves on the dischargre line that can be partially closed? What is the history of the equipment?

[myhvacx]

Just put the bulb in warm water, no difference..

[myhvacx]

Reciprocating compressor, the compressor is about 3 months old, the air h is about 3 years old, there's a pic, hope it uploads.. The system may have been overcharged from what i understand about 2 weeks ago..
Standing high side reads 200psi.

[myhvacx]

Im sry, scroll not recip..

[Hwolfe]

If there has been a compressor change on the unit I have seen the needle in the txv black and dirty from the torching/old compressor burn out. Especially when brazing without nitrogen.

[Tommy knocker]

Fans on? Plastic bag wrapped around cond? Split coils? If fans on and coils clean start pulling charge. Agree with push it on the restriction thing

[mechanical'al]

what was the old comps. problem ??? contamanents ,no nitro purge, heavy braze,didnt replace drier ,didnt add temp suct. drier ?????