Compressor super heat problem 0*f super heat

[primmers]

System ran it’s self out of Freon, I repaired the leak and added 134a back in to a full sight glass
Case is a open deli case (hussman) old..

Was setting super heat, started at a 17*f suction temp and a suction psi of 17psi

Closed the txt until it was closed, compressor super heat didn’t change...I can’t take the super heat at the
Txv.

If the txt failed would if fail open or closed?? I had 80psi head and 17psi suction

[JayMan7]

When you closed the txv all the way what did your pressures do?

Also what’s the condition of the evap coil and is it clean?

[primmers]

PSI never changed I can’t see the evap..there’s 6” between the top of

the unit and the ceiling

The suction temp never went to anything but 17* I need like 38*

[pecmsg]

Open case check air flow.
As far as not adjusting change the power head.

[primmers]

Have you seen how tight the head is on one off these?? I know the threads move when you tighten them
I don’t have much room, i closed the valve And

it still puts out Freon.. the seat may be bad

[pecmsg]

You need to pump it down.

[primmers]

I know...

[BALloyd]

Does it have a heat exchanger piped in somewhere?

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[primmers]

Yes I think so, it’s under the shelving..

I have manually shut the txv down and there’s no change in the suction line temp, it’s too low

I’m in calif, and leaving at 4am to get to my vendor to buy a new txv..a 3 1/2 hour drive..one way

[BALloyd]

If you have a heat exchanger and it fails, liquid refrigerant will go straight back into the compressor without going through the txv or evaporator.

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[Snapperhead]

Im not sure that I would go after that TXV .... I cant ever remember a TXV that metered out of control , but ive seen plenty that didnt flow enough

And whats up with 80 psi head ?

I would ramp that head up to 160 psi and see what suction and SH does

Turn off 1 of the cond fans , or if that unit only has 1 then cycle it by hand

Im just wondering if the head pressure control has failed

Im also trying to imagine a Heat Exchanger with a big enough leak to cause this ... has anyone seen a HX crack that big ?

[primmers]

Yes When I was a boy, I seen a exchanger that had leaked across..and I’m thinking it may of been this case I’m
Working on right now, I didn’t go get the txv, BALloyd made the suggestion and I’m waiting for 9am to roll around.

This unit has a headmaster control, so the fans run all the time, I will try disconnecting the fan, I placed a piece of cardboard
In front of the coil, covered a 3rd of it and it had no affect, I also think I added way too much Freon to clear the sight glass

The question that I cant find an answer to is can you manually shut the flow of Freon off by closing the txv manually..my suction temp 1 foot from the compressor stays
At 17*f no matter where the txv is set

[Snapperhead]

Pump it down and torch receiver

[primmers]

Not following??

[Snapperhead]

I placed a piece of cardboard In front of the coil, covered a 3rd of it and it had no affect

if its really chilly outside that will do very little , you have to cover the whole coil

Whats ambient ? When its below 40 , Feel the inlet of the coil and see if its hot , It should be cold .... the Receiver should be nice and warm because the master is directing the gas to it

[Snapperhead]

Not following??

you think you may have added too much refrigerant ? so check the level by torching it

Have you done this method ?

[primmers]

Ah, Ok..
Ambient was 52*

I’ll check it this morning two hours before they open.

[Snapperhead]

50 degrees it might be bypassing pretty well too ( if its working correctly ) alot will be shoved into the Receiver while "some" will be sent to the coil

You have to get in there and be touchy feely ...

[Snapperhead]

So when you have this 0 deg SH is the suction line frosting up ? Is the compressor sounding like it has popcorn inside ?

[primmers]

Noeverything looks and sounds good except the 46* box temp and the 0* superheat at the compressor