Electronic Function; Abbreviation; Display Function; Protection - Midea MSR1-24HRDN1-QC2W Service Manual

8 Electronic function

8.1 Abbreviation

T1: Indoor ambient temperature
T2: Pipe temperature of indoor heat exchanger
T3: Pipe temperature of outdoor heat exchanger
T4: Outdoor ambient temperature

8.2 Display function

8.2.1 Icon explanation on indoor display board.
①
This indicator illuminates when the air conditioner is in AUTO operation.
②
This indicator illuminates when TIMER is set ON/OFF.
③
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air
control feature is activated in heating mode.
④
This indicator illuminates when the air conditioner is running.
8.2.2 LED display control function.
Pressing "LED display" button on remote controller will turn off all displays on indoor unit, while pressing once
again, all displays will resume.

8.3 Protection

8.3.1 Protection of compressor top temperature.
When the Over-load Protector is cut due to too high temperature of compressor top, the unit will stop. When
the Over-load Protector is closed again due to decreasing of compressor top temperature, the unit will restart( in
this case the compressor is restricted by Three Minutes Delay protection).
8.3.2 Protection of discharge temperature (Td).
1) Compressor will stop immediately if Td>115 for 5s.
2) If 90 ≤Td≤115 , compressor will run with restricted frequency.
3) If Td<90℃, compressor will restart or run without restricted frequency
8.3.3 Three Minutes Delay at restart for compressor.
It will take 3 minutes every time when compressor starts.
Auto indicator
Timer indicator
PRE.-DEF. Indicator
OPERATION indicator
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