Heat pump pressure issues

[Jlcook00]

Went out on a call today for no cooling. Customer stated its cooling very little after doing a few checks first thing I found was the outdoor fan blade was upside down and fixed that. Then I hooked up my gauges, outdoor temp 75f low side is at 20 psi high side is at 160 psi r22 system ac mode. I add a little r22 and my high side climbs to 170-180 low side stays close to the same 20-24psi. I then put the system in heat mode to melt any ice that may be on the indoor coil it melts some off and my low side in heat mode falls all the way too 5psi high side sits around 160psi. Soon the compressor goes out in thermal oveoad when this happens my low side stays at 5psi and doesn't flow back this was still in heat mode. I cool off the compressor back to cool mode low side is at 25 high side at 170-180.I pull the bulb off indoor txv low side climbs slightly up to 28-30 high side still at 170-180. Indoor temp is 79. Cap tubes were freezing on indoor txv. Blower fan is running fine no air restrictions. What are your thoughts?

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[pecmsg]

Pressures without Temperatures are worthless!

Super Heat
Sub Cooling
TESP

Just to start!

[Jlcook00]

Pressures without Temperatures are worthless!

Super Heat
Sub Cooling
TESP

Just to start!

Subcooling was not registering so at or below zero and the low side temp stayed below zero

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[Jlcook00]

Subcooling was not registering so at or below zero and the low side temp stayed below zero

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Static pressures were good

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[Bazooka Joe]

Drier particularly restricted, if system has a drier?

[pecmsg]

Static pressures were good

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Whats "Good"?

[Jlcook00]

Whats "Good"?

About 0.3"

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[pecmsg]

About 0.3"

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Well at least that's a "Good" Answer! 15 mins to look it up but correct. Too bad most systems are .5 or worse.

[Jlcook00]

Well at least that's a "Good" Answer! 15 mins to look it up but correct. Too bad most systems are .5 or worse.

Correct most systems I come across are 0.8 - 1.5 have had a lot of bad ecm or x 13 motors go bad due to bad static pressures. Nothing was looked up I'm still out working and can't respond right away.

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[pecmsg]

So you care to explain how a Plugged/ restricted Orifice causes high head pressure?

If you close the valve on a receiver or the high service valve on a A/C condenser will it trip on High Head?

[Jlcook00]

So you care to explain how a Plugged/ restricted Orifice causes high head pressure?

If you close the valve on a receiver or the high service valve on a A/C condenser will it trip on High Head?

I could go on an explanation on all of this if I had time right now. Is this the I think he is a homeowner quiz? I should have taken members advice before when they said apply for the pro membership

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[pecmsg]

I could go on an explanation on all of this if I had time right now. Is this the I think he is a homeowner quiz? I should have taken members advice before when they said apply for the pro membership

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With your statement YES! You claim to be a contractor yet state a restricted Oriface causes the High Pressure Safety to trip!

I ask about the TESP and you quote text book that is rarely measured!

[Jlcook00]

With your statement YES! You claim to be a contractor yet state a restricted Oriface causes the High Pressure Safety to trip!

I ask about the TESP and you quote text book that is rarely measured!

Sorry when did I state yes or no?
And yes I measured it and it happened to be text book, took my manometer stuck the return and supply its rare but it happens to be perfect sometimes.
And I don't even to have to be a tech to know a restriction causes high pressures and temps in anything not just refrigeration
Come on brother is the quiz up yet

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[pecmsg]

And I don't even to have to be a tech to know a restriction causes high pressures and temps in anything not just refrigeration

Really?

[Jlcook00]

Really?

Yes really, that's a standard in more than just refrigeration

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[pecmsg]

Yes really, that's a standard in more than just refrigeration

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So I guess closing the receiver or the solenoid valve doesn’t work?

Please enlighten me!

I’ll even go so far as pinching off the liquid line with my linesman.

[Jlcook00]

So I guess closing the receiver or the solenoid valve doesn’t work?

Please enlighten me!

I’ll even go so far as pinching off the liquid line with my linesman.

What is your question

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[pecmsg]

What is your question

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How does a restriction cause excessive head pressure?

[Jlcook00]

How does a restriction cause excessive head pressure?

In the situation of say a restricted liquid line the refrigerant is continually pumped through the compressor increasing the amount building up behind the compressor and initially in my experience I have seen the head rise at first for a short time and then begin to fall back to normal or even begin to drop below normal in cases. This I believe is due to the fact that refrigerant itself is not going to cause high head but the act of refrigerant being pumped is the cause, meaning once all of your refrigerant is being pumped or as more and more is being pump through and backing up there comes a point where there is little or none for the compressor to pull and this is when the head will begin to fall back down. Almost like when doing a system pump down and your suction side will drop. This is just my experience I don't claim to know everything I'm a young tech of 3 years now this is why I'm on here looking for advice. Did install before

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[Hurst11]

A restriction can at times cause a high head but lots of time it will cause low head and low suction. Because there’s less refrigerant getting BACK to the compressor to be able to pump it. If restrictions caused things to build up tons of pressure we would blow a condenser up every time we pump it down. The reason that doesn’t happen is the refrigerant goes back to Liquid form and liquid refrigerant doesn’t make a lot of pressure. Was just the cap tubes frosting up after the txv or did the txv have any frost on it at all. Txv systems usually have a screen right before the valve. Lots of valves get condemned that are working fine and it’ll be the screen stopped up.