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Need Recharge education

I have 13 chest type freezers, a couple of upright freezers and a two Ice Machines having to do with my business. The freezers are not always in use, so are shut off until needed. I have one or two that will leak out if the are shutoff, so we no long shut them off, we either leave them on when empty or move items in from another freezer that we can shut off.

Question one)

Explain to my why the freezer will leak refrigerant when it is off but not on.

Question two)

Sometimes when I go to restart a freezer after it is off for a few weeks or month, it does not want to start. The breaker in the compressor just keeps cycling. Usually after enough time passes It finally starts and will run fine from then on. Why?

Question three)

I would like to get enough education to be able to add refrigerant when a freezer needs it. The electrical part I have a good handle on, I have gauges and have no problem installing a Piercing type Shrader Valve. I need to know how to decide if a problem is caused by low refrigerant, I'm not one to just do something because that's what I know, I want to troubleshoot and come to a logical conclusion.

Has anyone seen a good video that helped or a book that is focused on home freezer?

Help is appreciated.

I have a brother in law that does refrigeration and he usually fixes things when needed. He never charges me enough and I don't like to have him do it because of that.

Mikek

Reply to
amdx
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This would most likely be a pinhole leak in the evaporator (inside the freezer where the moisture and corrosion are). When running, the evaporator is at quite low pressure in a freezer.

When left idle, a lot of Freon dissolves in the compressor oil. When the compressor fist starts, the oil sump is in the suction side and the pressure drops, and that refrigerant explodes in foam, like opening a soda bottle, and floods the compressor. This can cause the compressor to have a heavy load before it even gets up to speed, and possibly stall.

Well, you should take the online test and get an EPA green card so you can legally buy the refrigerant. Then, you need a gauge set. These have temperature saturation values on the dial as well as pressure. You fill the system with the right refrigerant until the suction pressure is at the proper value, indicating there is enough liquid from the condenser to maintain steady, metered flow through the capillary tube. You also monitor the discharge pressure of the compressor so as not to overload it. You have to let the system settle into the steady state condition, this can take a LONG time with a freezer.

Jon

Reply to
Jon Elson

Sorry, I posted to the wrong repair group! Mikek

Reply to
amdx

HA, have you noticed the off topic posts around here lately ?

Reply to
jurb6006

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