Installation guide

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Design & installation Guide For McQuay MDS Multi System
Temp unit setting
There is a switch on the PCB board. When switch OP1 is ON, the unit is
; when it is OFF, the
unit is
o
F.Alternate method is as follows: Press fan key and last for 5 seconds in the normal
condition, the temp unit setting will be successful and there will be a buzzer to indicate.
Real time setting
Press CLK to enter, the first time is week setting and indicate its icon, press or
to adjust the week from Sunday to Saturday. If there is no press on any key within 5 seconds,
the unit will exit from the real time setting and back to the normal status. If you press CLK one
more time within 5 seconds, the setting will be OK and it is the real time setting icon, as well as
the light is twinkling. At this time, you can press
to increase the hour while press to
increase the minute. If there is no press on any key within 5 seconds, the unit will exit from the
real time setting and the time setting is valid. If you want to confirm the setting, you need to press
CLK one more time. If any other key is press during the setting, the system will exit and back
to the normal condition without saving
Mode setting
When the unit is in off status, you can press Mode to enter and the current mode is twinkling.
The mode will be changed when you press Mode one more time. The mode changing
sequence is as follows:
When outdoor unit is OFF:
Heat pump: Cooling ,heating, air supply, dehumidifying, cooling
Cooling only: Cooling, air supply, dehumidifying, cooling
When outdoor is in cooling condition: Cooling, air supply, dehumidifying, cooling
When outdoor is in heating condition: Heating, air supply, heating
Note: In one system, the follows are not available: some units are in cooling condition while the other
is in heating condition.
Air flow setting
In normal condition, when the Fan key is pressed, the air flow will be changed as the following
sequence: High, Auto, Low, Medium, High. When the unit is in air supply condition, there is no
Auto function.
Sleep
Press Sleep key, the icon will be ON or OFF.
Setting of auto restart after power failure
There is a switch on the PCB board to fulfill the setting of auto restart after power failure.
When OP2 is set
ON , then this function is active and the icon is shown on the LCD.
Manual defrost
When the unit runs in heating mode condition, press
Heater key and last for 5 seconds, you
will enter manual defrost mode , and Defrost mode is shown on the LCD. When it is auto
defrost, Defrost mode is also shown on the LCD and it will disappear when the defrost
finishes.