Midea MFE-60ARN1-RB4W Service Manual page 37

The others modes:
Condition
Ts-T1≥4° C
2° C≤Ts-T1 < 4° C
Ts-T1 < 2° C
8.3.2.4 Electric heaters (only available to some modes)
Electric heaters only opens in heating mode
MFE-60ARN1-RB4W(2T0043800036)
Condition
T4＜5℃
T4＞7℃
The others modes:
Condition
Ts-T1 > 6° C and indoor fan opens,T2 < 50 ° C
T1≥Ts or indoor fan closes or T2 > 52 °C
8.3.2.5 Defrost (only available to heating mode)
MFE-60ARN1-RB4W(2T0043800036)
---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
AC is turn on , 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
AC is turn on , whether or not the heating mode the temperature was detected, start
to statistical time when reach the temperature condition . Shut down or defrosting
T1-Ts
Low
-2
-3
Medium
-4
-5
Fan speed
High
Med
Low
34
High
Electric heaters
On
Off
Electric heaters
On
Off