Central Controller Mc303 - McQuay MDS Series Service Manual

3.4.3 Central Controller MC303

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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:
- Cooling only:
When the outdoor unit is Cooling:
When the outdoor unit is Heating:
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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COOL→HEAT→FAN→DRY
COOL→FAN→DRY
COOL→FAN→DRY
HEAT→FAN
Service Manual SM-MDS_(ii)