Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 Manual page 296

10.8. Defrosting operation (Available for heating only).
10.8.1 Defrosting condition:
10.8.1.1 When outdoor temp. is more than 0¡ æ ,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than
40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than
80 minutes, and the temperature remains consecutively -4°c for more than 3 minutes
10.8.1.2 When outdoor temp. is less than 0¡ æ ,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than
40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than
40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
c. The temperature of indoor unit pipe decreases 5°c than before
10.8.1.3 The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than
120 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
10.8.2 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
a. The defrost time has reached to 10 minutes.
b. When the temperature of outdoor heat exchanger rises up to 8°C and this continues for more
than 80 seconds.
c. When the temperature of outdoor heat exchanger rises up to 12°C
10.8.3 Defrosting Actions:
Com.
4 way valve
Outdoor fan
Indoor fan
max. 10 minutes
60s
ON 10s
ON
ON
ON
breeze
30s
OFF
OFF
OFF
OFF
295
ON
ON
ON