Posted by Roger Tomfohrde on March 27, 2013 at 09:31:52 from (204.77.51.79):
In Reply to: Re: Refrigerant help posted by Fritz Maurer on March 27, 2013 at 07:55:50:
The extra switch for the compressor should be wired in series with the compressor and cold control, so it can be serviced.If the condensing unit runs, the cold control is working. I have seen too many running too long without shutting of the condenser to let the evaporator de-ice because that fan should be on all the time. It does sound like the refirgerant has leaked out, the condenser should measure about 100 degrees in the center on a normal system. If it has ports on it the gauges should real 70ish when the unit is off on both sides of the system. I have seen too many that only have a low side access, you really need both. Has some one already tapped into it? If so it will be down at the condenser. Coke machines and similar old ones it is easy to slide the tray out with the evap, still attached by removing a couple plates. Checking temps with an accurate thermometer,(Themocouple)will get you in the ballpart for pressures if you can use the charts, Line from compressor to condenser real hot cooling to the 100 degrees in the middle. The evap has to operate below the box temperature or no colling will take place 10-25 degrees. If it all points to the refrigerant being low tap into it, off 70 ish just means you have refrigerant but not neccessarily enough.If it has leaked out you will need to find the leak and repari it. Depending on how long it has been sitting open will determine how long it need to be under a cacuum to get the moisture out wich can cause a lot of problems in a small system.Then it goes to having the correct equipment and being able to used it correctly.
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