Midea MFM-24ARN1-Q Service Manual page 37

DM16-01.01.25en
9.3.1.3 Indoor fan running rules:
When the compressor is on, the indoor fan can be set to high/low/auto. And the anti-cold wind
function has the priority.
Auto fan action:
T1-Ts
9.3.1.4 Defrost (only available to heating mode)
---Defrosting Conditions
Starting Of Defrosting Condition (meet one of the following is ok):
(1)Accumulated time when temperature of outdoor heat exchanger coil T3 is below 3°C reaches to
40 minutes, then consecutive 3 minutes less than -5 degrees (Just for the
whether or not the heating mode the temperature was detected, start to statistical time when reach
the temperature condition . Shut down or defrosting calculate time again).
(2) Accumulated time when temperature of outdoor heat exchanger coil T3 is below 3°C reaches to
60 minutes, then consecutive 3 minutes less than -4 degrees (Just for the
whether or not the heating mode the temperature was detected, start to statistical time when reach
the temperature condition . Shut down or defrosting calculate time again).
(3) Accumulated time when temperature of outdoor heat exchanger coil T3 is below 3°C reaches to
80 minutes, then consecutive 3 minutes less than -2 degrees (Just for the
whether or not the heating mode the temperature was detected, start to statistical time when reach
the temperature condition . Shut down or defrosting calculate time again).
(4) Under evaporator high temperature protection, the accumulated time when outdoor fan motor is
off and compressor is on reaches up to over 90 minutes .( Shut down or defrosting or T3 is over
15°C, calculate time again.)
--- Defrosting Action
Four-way valve, indoor fan, outdoor fan are shut down. Compressor keeps on.
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T1-TS
Low
High
Off
On
Floor Standing MFM
AC is turn on
AC is turn on
AC is turn on
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