Coleman mach 3 ac freezing up
We are having a freeze up problem with the ducted Coleman mach 3 ac unit. The evaporator is clean and the filter is new. We run it on high cold and turn the thermostat down from max cold. This past we...
Forum Discussion
It's going to be charged with R22 or R410a. The newer units use R410A. The unit can be checked(by a knowledgeable tech) for correct charge by using a clamp on meter. Using a piercing valve to attach gauges is irrelevent because that leaves a hole that must be repaired, a service port brazed in and the unit recharged anyway. Everyone likes to jump on "low freon" as the usual cause but these units only hold a pound of refrigerant and if you get a leak, you will almost always lose the entire charge.
R22 is relatively easy to charge, even by pressures. R410a, not so because it runs at such high pressures and is pretty unstable and has to be charged by weight or by superheat. Most RV shop techs will not know how to do that or will not have the equipment and that's why they always try to sell a new unit.
R22 is relatively easy to charge, even by pressures. R410a, not so because it runs at such high pressures and is pretty unstable and has to be charged by weight or by superheat. Most RV shop techs will not know how to do that or will not have the equipment and that's why they always try to sell a new unit.
