What causes central air conditioning to frost up?
Question:I've heard they may do that if low on coolant, but I don't understand why, it seems to me that low coolant would have the opposite effect.
Answers:
Low on coolant can give you a frosting condition, If the amount of refrigerant hasn't got to the point where it's not doing anything. Your A/c runs at about 35 to 40 degrees, if the amount of refrigerant gets lower, it will get colder to a certain point. It is capable of freezing up the evaporator, cooling coil.
They're are other factors that can cause this condition, poor air flow over the evaporator, (check your filters) to cold of ambient temperature, to cold outside, running to long, doors and windows open...
my car A/c use to frost up & they said it was from too mch condinsation. I would have to run the heater for a few to defrost it. Try that w/ u'r central a/c or jst shut it off or turn it up so it doesn't kick on as mch. It mite give it longer time inbetween kickin on & won't frost up.
Refrigerant starts to chemically react and become colder the farther it gets away from the compressor. If there is not enough refrigerant in the system it starts to cool down too quickly and is so cold that the condensation on the evaporator coil starts to freeze. Poor airflow can also cause a system to start to frost up because the air cannot take the "cold" off of the coil quick enough just as the furnace would overheat if the heat could not be taken off of the heat exchanger.
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