Midea MAD020T1N1S1 Technical Manual page 91

Midea Precision AC Technical Manual
Symptom
Air suction and
exhausting pressure
have no difference
after operation.
Symptom
High air exhausting
temperature
Symptom
High air exhausting
pressure
Symptom
Lack of refrigerant in system.
Air filter too dirty
Drier-filter is blocked.
Low air Non-correct overheat adjustment
suction
pressure or
return liquid.
Expansion valve error.
Condensed pressure too low
Belt creep
Symptom
Return liquid.
Large
compressor
Lubricating oil lost and cause bearing
noise. damaged.
Compressor or pipe line is loose.
 Common faults and handling methods of outdoor fan system
Both error and alarm are the abnormal working states of inverter. But there are different. Inverter
will self-check during operation. If there is error, the inverter will display error code, and cut off
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Probable reason
Reverse the compressor or inner air
mixed up.
Probable reason
Refrigerant leakage.
Probable reason
Condenser has been blocked.
Condenser fan cannot run.
Too much refrigerant adding amount.
Probable reason
Probable reason
MCAC-PDSM-2013-01
Check items or handling methods
When the compressor was reversed, change
any two L wires. Inner air mixed up, change
the compressor, Check the leakage and
maintain, and add refrigerant, change the
drier-filter.
Check items or handling methods
Check whether the leakage and maintain, and
add refrigerant.
Check items or handling methods
Clean the condenser.
1, Check the wiring was correct or not.
2, Check whether it has 3~10V DC between
wire 22 and wire 05. If has, the outdoor
inverter is error. And if no, check the indoor
unit controller.
Fasten the connection.
Check items or handling methods
Check the leakage and maintain, add
refrigerant.
Change the air filter.
Change the drier-filter.
Strictly accord to the adjustment steps to
adjust the thermal expansion valve.
1, Check the temperature sensor and the
balance pipe whether have leakage.
2, Check the expansion valve whether has
serious frosting.
Check the fan operates normally or not.
Check the belt and adjust it.
Check items or handling methods
Refers to Low air suction pressure or return
liquid.
Add the lubricating oil.
Fasten the connection.