Defrosting Operation (Available For Heating Only); Outdoor Low Temperature Protection (Optional); Automatic Operation Mode - Midea MSC-18HRIN1 Service Manual

11.7. Defrosting operation (Available for heating only).

11.7.1 Defrosting condition:
11.7.1.1. When outdoor temp. is more than 0℃,
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 -4°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 -2°c for more than 3 minutes
11.7.1.2. When outdoor temp. is less than 0℃,
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
The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
11.7.1.3.
than 120 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
11.7.2 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
11.7.3 Defrosting Actions:
Com.
4 way valve
Outdoor fan
Indoor fan
11.7.4 Rated capacity test
Set mode to cooling mode
Set temp. to 30 °C
Set fan speed to high speed
Push turbo button 5 times in 10 seconds.
Using special remoter controller
After 5 hours, cancel rated capacity test

11.8. Outdoor low temperature protection (optional)

Factory standard unit has not this function.
Unit stops when outdoor temp. is low than -15°C and lasting time more than 60 minutes, and unit runs
again when outdoor temp. more than -12°C.
When indoor PCB J1 jump is on, this function is available.

11.9. Automatic operation mode

The air conditioner automatically selects one of the following operation modes: cooling, heating or fan
38
60s
ON
ON
ON
ON
OFF
Breeze 10 seconds, then stop
Service manual
max. 10 minutes
10s
OFF
OFF
30s
OFF
ON
ON
ON