404A Freezer Issue

[crackertech]

I did try and turn off the TXV's cap, but I didn't have room to get any wrenches on it. It has been replaced sometime before and adjusting TXV obviously wasn't on the installers adgenda. It is an externally equalized TXV with a removeable power head. I wanted to open up TXV some but like I said impossible to get a wrench on it. I will try later when Im back to the Unit with a socket.

It's attached with copper and the last time I did one the copper bends real easy.

[beenthere]

Depends how cold the freezer is, and what temp it is outside. Mild temp day, 230 head, -10 in the box, 16.

[Lennyb]

16 PSIG on suction line in good all around conditions? Which would be about -22 on Gauge? So for a SH of 18-20 that means Im looking for a suction line temp of about zero??? Doesn't sound right!!! That would surely freeze up suction line and compressor etc.

SH=Suction line Temp - Evap temp

Or I thought

[beenthere]

You don't work on freezers often, do you?

[crackertech]

16 PSIG on suction line in good all around conditions? Which would be about -22 on Gauge? So for a SH of 18-20 that means Im looking for a suction line temp of about zero??? Doesn't sound right!!! That would surely freeze up suction line and compressor etc.

SH=Suction line Temp - Evap temp

Or I thought

Oh Boy.

[jpsmith1cm]

What will the ice hurt?

[ryan1088]

If only I could paid extra for those "froze up" calls where the accumulator has ice on it....I could probably afford that nice Caribbean vacation the wife has been wanting for 2 years!

Don't sweat the ice....you're in the home stretch now. sounds like you have the problem narrowed down, seal the deal.

[beb]

Is there a stainer on that TEV?

[Tommy knocker]

16 PSIG on suction line in good all around conditions? Which would be about -22 on Gauge? So for a SH of 18-20 that means Im looking for a suction line temp of about zero??? Doesn't sound right!!! That would surely freeze up suction line and compressor etc.

SH=Suction line Temp - Evap temp

Or I thought

SH 18-20? Ok don't be offended but you are not looking for the right numbers the right way. SH is the difference between saturated suction temp and actual suction temp and it should be 6-10 at the TXV bulb on a WI freezer. Agin don't be offended I'm not picking just wanna get you goin in the right direction.

[Tommy knocker]

Also don't worry about frosting of the suction line it's going to happen if not insulated because the line temp will be well below 0 on a -10 degree box. The comp will not freeze up if charge and SH are correct.

[Lennyb]

No mostly heat pumps and coolers

[Lennyb]

So your saying that the Evap line temp at the TXV bulb should be 6-10 for a 404a freezer? Also maybe im just slow but I was under the impression I understood SH

[Lennyb]

With R22, 410A, and coolers with 414B, 409A, and 404a. Only 3 freezers on property.