I understand that to set the thermostat correctly in the freezer, I must check the temperature or the holding plate in reference to its "eutetic temperature" . How do I check the temp of the plate rather than of the air in the box? Thanks.
well i have been around ref.and ac most of my life . i live aboard. r12 and r134a units are supposed to cycle at 5 degrees above 0 but due to poor door seals (even on new boats) and general locations the best you can hope for is around 15 - 20 deg.(freezer).the way to measure this is with a regular thermometer that will go down to -20f.let unit run 24hr.with 1qt.of water in it.put thermometer into center of unit for 5 min. remove quickly and read it.if reading is below 20deg. good! if not start adjusting 1 setting at a time and let unit run 24hr.before checking and re adjusting.NOW ON TO REF.SIDE ----------------THE TEMP SHOULD BE 35DEG.------------IF NOT ADJ.TO YOU GET IT.also if the condensor coil is dirty it wont get cold enough just keep it simple''''''''''''''harold
The only accurate way to check the plate temp is with a digital thermometer with remote sensor. Dry the plate off and tape the sensor to it with a piece of insulating material between the plate and the sensor. Operate the system and watch what temperature the plate is at when it cycles off. An easier way it to put a thermometer in the box and adjust the thermostat until it is cycling at the temperature you prefer.
Thanks, Bill. Grunert gave me the procedure I referred to in my post, and said that by lowering the cutoff point on the thermostat it will only make the unit work harder, but that the plate will always return ot its eutetic temp rapidly. I suspect they are being too technical and not too practical, but is there any element of truth in what they say?
With most eutectic solutions, it is possible to pull them below their freezing point, but, Grunert is correct. The temperature of the solution will rapidly climb back up to its freezing point.
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