Use and Care Manual

Page 53
mrcool.com
Automatic Wiring/Piping Correction Function
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.
NOTE
The function for the automatic wiring/piping correction illustrated below is intended for use by a
licensed electrical technician only.
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