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Any chance you can get a look at the A/C TXV for info?

yes- the explanation is to see how your liquid line temperature matches up with your "indicated" condensing temperature. High subcooling would possibly mean noncondensables. High subcooling could...

It sounds like this system began life as an R502 system. Before chasing your tail, take a look at your pressure/temperature chart and compare the condensing pressures of R502 to R507. Example- at a...

You can't use the emerson valve because the Z charge is low temp. What if you used the 1/2" outlet valve and a 1/2" x 3/8" fitting bushing?

http://www.sporlanonline.com/prvs.shtml

I had seen it done by manufacturers. I believe it's to ensure that liquid refrigerant is entering the capillary tube. I started to copy the idea.

Pressure limiting will be indicated on the TXV label. For example- your valve might be a SPORLAN EFSE-1-SZP. The Z = low temp amd the P = pressure limliting. On some applications there will be a...

Check the TXV to see if it a pressure limiting type. If yes, you charged the system when the box was hot and the TXV was throttling flow to keep the evaporator pressure from going too high and...

Alco take apart TXV's [T series] have selectable cages inside. The cage has the port, superheat spring, and adjustmnet all in one assembly. Trane used to use them a lot. Check them out at...

Hey Dow
Glad to see you back. I was on hiatus for a while as well. I did grocery stores for many years and, while it's good work, the hours do get old. You wind up giving too much money to Uncle.

I went to Tecumseh's website, clicked on library. Then I selected product search and entered the compressor model #. A product desription page came up. To the right you'll see links for technical...

I did a search for Kysor Warren which took me to Heatcraft. New one on me, I didn't know Heatcraft owned them. There is a historical documents section which contains an IOM for D6S1 which is probably...

Go back to square one and get a full set of diagnostic numbers [refrigerant type, type of temperature control, evaporating temp, condensing temp, superheat, subcooling, ambient temp, box temp, TXV...

My experience with cap tube systems has been that if the liquid line dryer is upsized, the charge usually has to be increased to compensate. The larger drier increases the internal volume of the...

Well, the total suction superheat is around 116F to 120F [evaporating temerature plus 80F suction line] which seems excessive. Additionally, the condensing temperature is about 103F. I agree that a...

Get yourself a charging slide rule from Trane or Carrier [or both]. I used to use them on all brands, Worked fine.

Is the compressor nameplate readable? Mabe that can clue you in. Looking at the TXV heads might help. You could also try calling Heatcraft.

Where is the suction line piped to the compressor? If it goes to the head, it's air cooled. If if goes to the motor housing, it's refrigerant cooled. If the compressor is a Copeland, the second...

I was very satisfied. With the newer features, it's even better. And it comes with a 30 day no questions refund. I have talked to a few guys around the country who are doing well. It's a full...

check out this website
www.uncleharry.com
just my 2 cents worth but I think it's better suited to your needs
btw- he is in the Baltimore area and does one day ride-alongs
I bought the program...

sitting at my desk one day, phone rings, kid on a no a/c call at a restuarant

kid- I need a thermostat, the customer was putting up some decorations, bashed the thermostat with a ladder

me-...

R4909A? What was the original refrigerant? What TXV does it have? R409A is an R-12 substitute. R408A is an R502 substitute.

reheat system- cools to a specific humidity then adds sensible heat to the supply air which lowers the RH. Dust off your psychrometric chart and see what happens to RH as you move straight across to...

Used board? You're kidding right? Have you tested the bin thermistor? You can get a service manual at Scotman's website.

If you have excess cooling capacity, why not turn it into a reheat system with some strip heaters? It won't be cheap.