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Working on a HK meat freezer./not cooling and thinking cap tube or compressor
I'm trying to determine if the system has a clogged capillary tube/filter. Suction pressure was low and should be around 12-17 psi and discharge around 220 using 404a. Amps should be 8 but im not getting suction pressure about 8psi. the unit holds 13oz. I put 35oz while testing and never got above 8 suction and around 159 discharge. Amps when starting did get above 13 for a short time. First I was thing bad valves in compressor. But the system did balance close to 195 psi with nitrogen around 195 suction and 199 discharge.
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Cap Tube , is restricted . Compressor not pumping would have high suction pressure. Best way to check equalization is with refrigerant in the system. Low and High side gauges on . run system observe operation , the switch off , and watch equalization take place , a steady drop in high side till they match . I checked 1 last week took less than 2 minutes , cap tube ok . i had been sent to the job with a new cap tube and an apprentice , he was to change it . I said this is a way to check it and found it was not blocked . Diagnosed by another Tech , a good lesson day ?, or may be confused him ..
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Originally Posted by
COOLJIM
Cap Tube , is restricted . Compressor not pumping would have high suction pressure. Best way to check equalization is with refrigerant in the system. Low and High side gauges on . run system observe operation , the switch off , and watch equalization take place , a steady drop in high side till they match . I checked 1 last week took less than 2 minutes , cap tube ok . i had been sent to the job with a new cap tube and an apprentice , he was to change it . I said this is a way to check it and found it was not blocked . Diagnosed by another Tech , a good lesson day ?, or may be confused him ..
Or it could be in the filter dryer. I’m going to change out the filter dryer and after that I have a 25 gauge needle and syringe to where the nitrogen fitting matches up to the syringe the throttle just enough nitrogen through to see if I do have a clogged tube.
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I don't think I've ever had a 404 cap tube get waxed up.
I changed a few when changing rotted out evaps just because...
I did have one that I THOUGHT had a plugged tube. But in the end it was actually a kinked suction line that wasn't letting enough back to the compressor.
And that kink wasn't visible until I pulled all the armaflex off.
I'd suggest looking really close at the suction line
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Originally Posted by
Restaurant mech
I don't think I've ever had a 404 cap tube get waxed up.
I changed a few when changing rotted out evaps just because...
I did have one that I THOUGHT had a plugged tube. But in the end it was actually a kinked suction line that wasn't letting enough back to the compressor.
And that kink wasn't visible until I pulled all the armaflex off.
I'd suggest looking really close at the suction line
That’s actually a good idea. They’ve had problems with this unit in the past And I’m new to the company and I charged it maybe three weeks ago to a month and here we are back again. I was thinking leak but as I was working on another unit I was leak testing it for three hours never had a drop in pressure. And pressure was Equalized on both lines. But no matter what I know there’s no refrigerant getting into that evaporator as the temperature was 75 and that should be running at -16
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Get the book
Commercial Refrigeration for Air Conditioning Technicians by Dick Wirz