Freezing up, to me, usually means low on freon. It is a Coleman Mach (written on side) on a 2003 Coleman Sedona Pop-up. I have been told by people in this area that they do not have a refill setup and has to be installed. Since it is out of warranty, thats not a problem for me. However, they tell me that if they tap it and fill it, they will not guarantee it will not cause further problems. In other words, you pay me big bucks and I won't guarantee it will ever work again.
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Re: at a State park... AC freezing up
If the unit is low on freon, there should be visible signs of leaking somewhere in the upper unit. Are you running the system on Low Cool? This will often times cause the AC to freeze up because the condenser fan and the evaporator fan are on the same motor. If you run the system on low cool, you are not getting enough air movement over your condenser to effectively warm up the freon and thus causing the system to freeze. Turn it to high and adjust the thermostat if it is too cold, this should help.
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Lets go over the way a sealed system works. There is a highj side and a low side. The low side is the side that passes through the evaporator coils inside the machine. Most times on the freezer side only, but sub zero has independent sealed systems for each side. Once it goes throug the evaporator its then condensed into a liquid state, the high side. This is also the hot side. Well, lower pressures in the low side would logically mean lower temperatures. So for the refridgerator not to freeze more freon is used on it to keep the low side pressure higher than normal, giving the cooling effect verses freezing. So, and here is the bad part, if you are seeing ice build up in the refridgerator side you have a freon leak some where allowing the pressure to be less than required to keep it above freezing. Call a service technician and depending on how the model, sub zero warranty is parts and labor covered for the first 6, and only parts from the 6-12 year.
There are varius items that make the unit inside (air handler) freezes up .If the fan motor in the air handler doesn't work it'llice up.If the filter is dirty it'llfreezes up. If the coil in the air handler is dirty it will freezes up.And if the unit is low in refrigerant(freon) it'll ice up.If is low in gas means there's a leak and before recharged it needs to be fixed.
Are the coils freezing up half way down or all the way up? Half-ways down means low on freon, all the way up, mean low air flow,due to dirty filter, and adjust the thermostat up a little higher, it could be going out also.
1) locate the A-Coil (A-frame) inside the furnace. It is usually located in the furnace supply plenum located on the "down" side of the furnace plenum. If it is very dirty, there will be poor air flow generally in the house. This can cause the A/C to "freeze up" as the refrigerant is not getting enough heat to convert the refrigerant to a gaseous state.
2) The unit may be low on freon (or whatever refrigerant you are using). Contact a serviceman to check the unit.