26 Service Manual SM-MDS_(ii)
3.4.3 Central Controller MC303
1. Address Register
After communication wire is completely connected, press “SETUP” key for 5s. Address will be
automatically registered and a number from 60 to 0 will be shown on the display LCD.
2. View Actual Address
Press “MODE” key for 5s then press “▲” or “▼” to view all the units.
Actual address has four figures; first two where show on minute previously are for outdoor unit, last two
where show error previously at the right bottom corner are for indoor unit.
3. Single/Group Unit Setting
Press “UNIT No.” key to enter the unit setting, then press “▲” or “▼” to choose the unit number to be
set and press “ENTER” to confirm choosing.
When LCD panel show “_ _”, press “ENTER” to confirm enter group setting.
4. ON/OFF Operation
Press “ON/OFF” key to RUN or STOP the unit operation.
For Group On/Off, press “ON/OFF” key for 5s and the unit number is twinkling, “[ ]” is displayed on LCD
panel. Then press “ON/OFF” key to turn on/off all units.
5. Mode Setting
Press the “MODE” button, the current mode is twinkling. Press again to change mode as follows:
When the outdoor unit is OFF:
- Heat pump: COOL→HEAT→FAN→DRY
- Cooling only: COOL→FAN→DRY
When the outdoor unit is Cooling:
COOL→FAN→DRY
When the outdoor unit is Heating:
HEAT→FAN
6. Temperature Setting
Use “▲” or “▼” keyboard to increase or decrease by 1 °C/°F, temperature range is 16-30 °C (61-86°F).
Press “FAN” for 5s to alter between °C and °F.
7. Fan Speed Setting
Press “FAN” key to adjust fan speed follows by:
High→Auto→Low→Medium→High
When the mode is “Fan”, there is no “Auto” speed. Single-speed fan motor has no this function.
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