Wired Controller Mc301 - McQuay MDS Series Service Manual

3.4.2 Wired Controller MC301

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1. ON/OFF Operation

Press "ON/OFF" key, the unit will be ON or OFF, and "ON" or "OFF" will display on the LCD.
2. 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.
3. 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.
4. 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: COOL→FAN→DRY
When the outdoor unit is Cooling:
When the outdoor unit is Heating:
5. Swing Setting

Press "HEATER/SWING" key to active swing function (Only for swing unit). "SWING" will display on LCD.
6. Auxiliary Heater Setting

Under "HEAT" or "FAN" mode, press "HEATER/SWING" key to active heater. (Only for heater unit).
"HEATER" will display on LCD.
7. Sleep Setting

Press "SLEEP" key, "SLEEP" will display on LCD, which means this function is active.
8. Keyboard Lock

Press "SLEEP" for 5s, the keyboard will be changed between locked and unlocked.

When it is locked, the lock icon will be shown on the LCD. At this time, only the ON/OFF key is valid.
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COOL→HEAT→FAN→DRY
COOL→FAN→DRY
HEAT→FAN
Service Manual SM-MDS_(ii)