coldtable

[will173]

M working on a cold table that have r404 a gas . I found the unit not cooling so I said to costumer let change the txv. Which then I ran in to a problem where the old txv. I couldn't make out the numbers so I call the compressor in and got a txv for the compressor size now I've waited like 25 minutes and the unit hasn't dropped . Wellmy pressure is 275 on the high side and 47 on the low side any help would help.

[jpsmith1cm]

Hmmm.

Not quite enough data to help you out.

Please post a full set of operating conditions and maybe you'll find more assistance,

[jackintheboxtec]

Why did you condemn the TXV in the first place? Did you check anything else first? Or just look at it and say "YUP" I think we need a TXV.

[james122964]

It has been my experience that this type of equipment has valves that are OEM and usually a version just for them.

When tables are not cooling, it depends on more than the txv, is this unit one with a cold wall type evaporator, or does it have a fan and coil type?

there is much, much, needed.

with those pressures your evaporator should be cold, unless you are undercharged, and or have non-condensables in it.

jim

[crymtide]

M working on a cold table that have r404 a gas . I found the unit not cooling so I said to costumer let change the txv. Which then I ran in to a problem where the old txv. I couldn't make out the numbers so I call the compressor in and got a txv for the compressor size now I've waited like 25 minutes and the unit hasn't dropped . Wellmy pressure is 275 on the high side and 47 on the low side any help would help.

A lot of cold pans I work on just piddle for the first 30 minutes or so and then when they get to 27F or so they start dropping in earnest and by 1 hour they are at an operating temp of 0 to -1F.