Install Manual

Page 44
mrcool.com
Newer models now feature automatic correction of wiring/piping errors. Press the"check switch"
on the PCB board of the outdoor unit for 5 seconds until the LED displays"CE.” This indicates that
this function is working. Approximately 5-10 minutes after the switch is pressed, the"CE" will disappear,
meaning that the wiring/piping error is corrected and all of the wiring/piping is properly connected.
How To Activate This Function
1.
Check that outside temperature is
above 41°F (5°C). This function does not
work when outside temperature is not
above 41°F (5°C).
2. Check that the stop valves of the liquid
pipe and gas pipe are open.
3. Turn on the breaker and wait at least 2
minutes.
4. Press the check switch on the outdoor
PCB board unit LED display "CE".
Correct
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Incorrect wiring
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Incorrect wiring
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Check switch
LED display
Automatic Wiring/Piping Correction Function
NOTE
The function for the automatic wiring/piping correction illustrated below is intended for use by a
licensed electrical technician only.