HIGH SUCTION PRESSURE / LOW HEAD PRESSURE ISSUE

[EdHvacr]

Hey guys,

need some help i am working on a carrier unit with a Scroll Compressor. I am getting 80 PSIG low side and 165 PSIG high side. Liquid Line is also very hot to the touch. I know this is not normal readings and since it's a scroll compressor, I am thinking about replacing the TXV. Thanx for the help.

[jayguy]

You are going to need to gather more info than that and post it because you are about to find out the TXV is not the problem.

[rider77]

Time to put your gauges, meter and thermometer to work. Need more info.

[gravity]

You mean.....hot gas line is hot to the touch?

Need more info


Sent from my iPhone using Tapatalk

[lytning]

That did sound like what he said didn't it.(:-

You mean.....hot gas line is hot to the touch?

Need more info


Sent from my iPhone using Tapatalk

[EdHvacr]

sorry guys about not getting more info didnt have enough time cause i deal with all other stuff also, tommorow ill get the temperatures, but like i said the liquid line between the condenser and txv is hot to the touch, i know this line is suppose to be warm after the refrigerant subcools, the outlet of the TXV is cool but is not like super cold and theres no condensation. Im getting 80 PSIG suction pressure and 165 head pressure im kinda new to the field have about 2.5 years including 2 year tech school

[EdHvacr]

r22 system with scroll compressor 10.8 lbs of r22 compressor is running about 11 amps

[incontrol]

Sounds like valves; weird for a scroll. Is there any way to valve it off & try pumping it down? Stop the cond fan & see if she'll build some head.

[jimj]

r22 system with scroll compressor 10.8 lbs of r22 compressor is running about 11 amps

Ed did they teach you about super heat and sub cooling at tech school?

[2sac]

Give him a break guys, he has to deal with other stuff also, unlike the rest of you who just answer questions on the internet.

[lytning]

2sac that wasn't nice(:- Might be accurate, but still.......

Give him a break guys, he has to deal with other stuff also, unlike the rest of you who just answer questions on the internet.

[EdHvacr]

lol, yes i know i havnt had time to get those readings SUBCOOL is condensor temp - liquid line temp, and SUPERHEAT = is evaporator outlet/suction line temp minus evaporator temp

but just going by touching and feeling, ill say that subcooling is very low due to a hot liquid line, condenser is not rejecting enough heat ???

[EdHvacr]

i will try to use my thermometer tommorow for more info on whats going on everything that i read about concerning this symptom points finger at a txv im at lost first time i have encountered this problem

[EdHvacr]

i can try that, but can you tell me what this would be telling me because i am a little confused but i will try tommorow if i have time to work on it

[EdHvacr]

i wanna be able to fix this for brownie points and save money for not calling contractors, im the junior a/c guy here

[2sac]

2sac that wasn't nice(:- Might be accurate, but still.......

If I started to act nice, you guys would think something is wrong.

[2sac]

i will try to use my thermometer tommorow for more info on whats going on everything that i read about concerning this symptom points finger at a txv im at lost first time i have encountered this problem

I'm curious as to what you've read that leads you to believe it's the txv?

[rider77]

i wanna be able to fix this for brownie points and save money for not calling contractors, im the junior a/c guy here

I know you want to fix it, but let's slow down and use some theory here. Diagnosis should never include the phrase "I think".
You want to look good for the boss, but you also don't want to throw parts and money at the issue or make the issue worse.

[gravity]

Could be low on gas and txv is wide open trying to maintain sh?


Sent from my iPhone using Tapatalk

[rider77]

Could be low on gas and txv is wide open trying to maintain sh?


Sent from my iPhone using Tapatalk

SC should show the evidance of such. With a hot liquid line I think there might be several issues going on at once here.