R404 walk in

[Rleymarie]

I’m n ac guy trying to help a buddy with walk in with r404. Can only get 20 degrees super heat liquid temp 112. 305 psi. Suc 50 psi. This is a new start up Txv is open all the way. Site glass is full amp 17 amp rated 22. Outdoor temp 82 box 45

[pecmsg]

20* where. At the compressor fine at the coil no good.
Is this a pressure limiting valve?
Can’t accurately adjust until at or near temperature.

[pecmsg]

Just read
Put the damn valve back at mid point.

[pecmsg]

Get it
Read it
Know it
https://www.amazon.com/Commercial-Re.../dp/130550643X

[crazzycajun]

FYI you check superheat when box is close to temp 50psi sounds low for med temp 404

[Rleymarie]

24 degrees at compressor

[Rleymarie]

Box is 45

[Bombboy90]

Box is 45

Walk in cooler or freezer?

[pecmsg]

24 degrees at compressor

24 suction temp or SH?

[pecmsg]

And reset that valve to mid point.

[Snapperhead]

Sounds like your TXV is too small if you have it turned wide open and still only have 50 psi

Ive seen it before ...

Whats the number stamped on the valve ?

Make sure the Nozzle was put in also

[Rleymarie]

Walk in cooler or freezer?

walk in cooler 24 degrees super heat at compressor -- txv is full open

[Rleymarie]

sporlan SBQE w/external equalizer -- pink cartridge --- sporlan sized -- site glass is full -- what type head pressure this run at 90 degree out door box at 45

[Restaurant Mech]

sporlan SBQE w/external equalizer -- pink cartridge --- sporlan sized -- site glass is full -- what type head pressure this run at 90 degree out door box at 45

At 90 f 300psi wouldn't surprise me depending on condenser efficiency.
350 probably wouldn't even be completely out of line....
But obviously the lower the better.
Pulling down a hot box will have elevated head pressure. If it's not tripping a safety then I rarely read head pressure until the box is down to temperature on a new install.
After the box is down to temperature, then you start measuring superheat and head pressure. Until then you are wasting time.

[Special-K]

Moved to Refrigeration forum

[VTP99]

Without knowing the box size, compressor size, evaporator size " pink cartridge " means nothing.
Well other than it's rated at 1.5 ton.

[WT70]

I’m n ac guy trying to help a buddy with walk in with r404.

Cooler or Freeer?

Can only get 20 degrees super heat liquid temp 112. 305 psi. Suc 50 psi. This is a new start up. Txv is open all the way. Site glass is full amp 17 amp rated 22. Outdoor temp 82 box 45

None of this tells us anything without the following:

Box size

Evaporator Model

Condensing unit model (not compressor)

You gave use the TXV size, as 1.5 ton based on how it’s built. But what power element, and why a SBQE instead of an SQE? I personally do not use balanced port valves except for a purpose that specifically calls for it (eg, flooded evap, some ice machines, smaller single pass evaps) but that is my preference.

Liquid/Suction line sizing.

Suction pressure at the condenser

Suction pressure at the Evap.


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[Rleymarie]

Cooler or Freeer?



None of this tells us anything without the following:

Box size

Evaporator Model

Condensing unit model (not compressor)

You gave use the TXV size, as 1.5 ton based on how it’s built. But what power element, and why a SBQE instead of an SQE? I personally do not use balanced port valves except for a purpose that specifically calls for it (eg, flooded evap, some ice machines, smaller single pass evaps) but that is my preference.

Liquid/Suction line sizing.

Suction pressure at the condenser

Suction pressure at the Evap.


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3/8 liquid line
7/8 suction
box 12 x 24 x 8
50 psi at compressor
condenser AVA7523ZXNXC 3 HP TECHUMSA
EVAP CEL0250AS6AMAB0000 HEAT CRAFT

A LITTLE HISTORY -- WHEN I ARRIVED IT HAD A SBQ BODY WITH INTERNAL EQUALIZER , KT43JC ELEMENT AND A C CARTRIDGE --- CALLED SPORLAN GAVE ALL INFO THIS IS WHAT I GOT

SBQE BODY
KT43SC/PC ELEMENT
B CARTRIDGE

IT SEEMS THE EVAL IS STARVING ???

7 DEGRTEES TD ACROSS COIL

DID NOT CHECK SUCTION AT EVAP

[Red850kid]

I'm anxious to know what the problem was. Does it make temperature and shut off eventually? How far is the CU from the evap? Above or below?

[WT70]

3/8 liquid line
7/8 suction

This should be fine.

box 12 x 24 x 8

Btu Required is 12,960 with heavy use.

EDIT: That was off US Cooler’s website. The HeatCraft chart states around 20,000btu. So that’s sized correctly as well.

50 psi at compressor

This is, if I remember, about a 5deg sst. That’s too low. I’ll get to what’s up. I think.

Condenser AVA7523ZXNXC 3 HP TECHUMSA

Capacity 21,460btu

EVAP CEL0250AS6AMAB0000 HEAT CRAFT

Capacity 25,000btu

A LITTLE HISTORY -- WHEN I ARRIVED IT HAD A SBQ BODY WITH INTERNAL EQUALIZER , KT43JC ELEMENT AND A C CARTRIDGE --- CALLED SPORLAN GAVE ALL INFO THIS IS WHAT I GOT

SBQE BODY
KT43SC/PC ELEMENT
B CARTRIDGE

This is a 1 1/2 - 2 ton Balanced port External EQ

IT SEEMS THE EVAL IS STARVING ???

7 DEGRTEES TD ACROSS COIL

DID NOT CHECK SUCTION AT EVAP

Install a SQE 3x4x2 with a Black/#5 cartridge and a KT43SC power element (which you have).

I believe that will solve your problem. I honestly do not think the balanced port will open up enough with the cartridge that is in it.

I’d suggest going with the White C cartridge for the balances port you have, but I don’t know if it will throttle down enough when the box gets to temp and load is down.

Someone else may disagree. But that’s my pennies worth.


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