MCAC-RTSM-2011-12 Midea Combo Type Heat Pump Water Heater Technical Manual
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Fan motor will start with high speed 30s in advance of the start of compressor;
After staring, Fan motor speed will be regulated by Tp ( Compressor discharge temperature) with
following logic
Fan motor will stop 30s behind of the stop of compressor
2.4.4 Defrosting during Water-heating
Conditions to activate defrosting cycle
When T3 ≤0℃, Comp. is continually running for 40min
(If Comp. restart frequently, which can only run within 10 min. for each start cycle, system will count
accumulated running time, when accumulated running time reaches 40min, defrosting cycle will activate 2
min. after Compressor’s next start
Conditions to inactivate defrosting cycle (when achieve any one of following conditions)
1. Defrosting time reaches 10 min;
2. T3≥15℃;
Main components’ movement when defrosting
2.4.5 Ambient Temperature
a) The system’s operation temperature is within -30~43℃ and below are the operation temperature for
each mode.
b) Economy Mode: -7~43℃
c) E-heater Mode: -30~43℃
2.4.6 Self-Protection Detection
a) When the self-protection happens, the system will be stopped and start self-check, and restart when the
protection resolved;
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