You may have to replace the main harness. Having replaced the thermostat 3 times and this one ohms out properly, I believe you probably have a problem in the main power harness of the machine, probably failed wiring in the power block where the compressor plugs in. Ohm out the thermostat (with no wires attached to it) and see if you have a closed circuit in the thermostat until it is turned off, at which time you should have an open circuit across the two terminals. If turning off the thermostat won't turn the compressor and condenser fan off, then you have wiring problem or a bad thermostat. This will sound like it's running but not blow much air up into the cabinet or pull much air through the evaporator (test with a small piece of paper to see if it pulls against the evaporator). You could also have a slow evaporator fan. This completes the air box so air is only pulled through the front of the evaporator. Is the evaporator shroud properly installed on the top of the evaporator? The shroud is almost as wide as the cabinet, hooks on the air duct behind the evaporator and then is clipped to the evaporator on both front corners, laying on top of it. Are there any missing chunks of door gasket? Is the delivery flap door still on the machine? Is the drain hose attached under the cabinet? You said you lubed the door gasket - is it folded over on the hinge side (shouldn't be)? Does the lube transfer to the cabinet facing edge so you know the gasket actually touches the cabinet? Is the bottom edge of the inner door gasket properly attached to the door - they get torn loose. This standing water then creates a high humidity environment that will freeze the evaporator.Ĭheck for air leaks. This can be caused by a plugged drain hose or cabinet not level. Does the cabinet drain all moisture out? You should not have any standing water in the cabinet.
This is called short cycling and requires a new thermostat. If the thermostat is faulty and not turning off long enough for the moisture to run off the evaporator, then when the compressor turns on again it can cause the moisture to freeze on the evaportator. An overcharged or especially undercharged unit will ice the evaporator.ĭo you have high humidity in your area or in the environment the machine is in? If so you will have extra condensation on the evaporator.
on the low side of the system while it's running, measured with a proper gauge set. No other adjustment is needed unless you are at a high altitude.Ī proper freon charge in the compressor (measured with NO ICE on the evaporator) is between 18 - 20 lbs. This will give you a proper temperature setting around 40 degrees when the compressor shuts off. Mark this as zero, then turn the dial clockwise to the 3 1/2 mark or 3:30 position base on zero being 12:00. You have to turn the dial counterclockwise until the compressor and condenser fan turn off. Both styles of thermostat should be set to 3 1/2 on the dial. The hook is slid into the slot cut into the rear air duct simply to hold it in place. The capillary tube of this thermostat style has a hook formed in the end of the tube. There would be a short 1" slot in the rear duct behind and to the right of the right side of the evaporator kind of high up on the duct facing you, but easy to see with a light. The capillary tube of the thermostat comes folded over twice from the factory (don't fold a cap tube yourself) and is inserted into the tube several inches behind the evaporator. You can have two styles of Dixie Narco thermostats, one is inserted into a hollow tube running behind the evaporator that is open on the right side of the evaporator. I also can't imagine why the thermostat was changed 3 times unless they were all "used" and therefore suspect thermostats.
What was the exact symptom that required replacement of the cooling deck? Going off what you have told us, it is entirely possible that the "new" compressor is low on freon. One thing we need to know is how fast does it ice up and how much of the evaporator is iced. Golfdogs, the cause of a freezing evaporator can vary, Low freon is the most common cause but other causes can be a slow or non-functioning evaporator fan (inside the cabinet and should run always), bad - incorrect - incorrectly set thermostat, an air leak at door seal - delivery port - drain hose, cabinet not draining water out, or a missing/loose evaporator shroud.