Install Manual

Page 34mrcool.com
System Leak Checks
How To Activate This Function
1.
Check that outside temperature is above 41°F (5°C). This fuction 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 the LED displays "CE".
5. In circumstances where the wiring for one unit is mismatched with the piping of the other, the system will
correct itself, reassociating the wiring to the piping.
6. After 5 to 10 minutes, if the system is corrected, the “CE” will disapear from the display. If not, the system
will have to be shut down and the piping/wiring will need to be re-checked with what is in the manual.
Check switch
Fig. 7.1
Multi-Zone units have a self-check function for wiring-to-piping association errors. Press the "check switch" on
the outdoor unit PCB board for 5 seconds until LED displays "CE". Approximately 5 to10 minutes after the
switch is pressed, the "CE" will disappear when the wiring and piping are reassociated and the error is
corrected.
This only works in situations where either all of unit A Handler wiring has been connected to the unit
B terminals of the condenser or all of unit B Handler wiring has been connected to the unit A
terminals of the condenser, and this asumes that the indoor unit wiring is connected correctly. There
can be no cases of partial association/mismatch, such as a cross terminal/partial wiring mismatch
or one side of the refrigerant system being crossed between handlers.
Self Correction Function (Multi-Zone Models Only)
Fig. 7.2
Gas Line
Liquid Line
Wiring
B
A
A
B
HANDLER UNIT A
HANDLER UNIT B
B
B
A
A
B
A
A
B
HANDLER UNIT A
HANDLER UNIT B
B
B
A
A
B
A
A
B
HANDLER UNIT A
HANDLER UNIT B
B
B
A
A
CORRECT CONNECTION
INCORRECT - CONNECTION CAN BE CORRECTED
NO OTHER CORRECTABLE COMBINATIONS
(gas / liquid lines can not be mixed between units)