McQuay MDB075B Manual page 5

2. OPERATING GUIDE
2.1 ON/OFF key
Press once to start the air conditioning unit.
Press again to stop the unit.
The operation lamp next to the key lights up and goes off respectively when the unit is running
or not running.
Caution : In the case when the ON/OFF key is pressed immediately after the operation is
stopped, the unit will not restart until 3 minutes later to protect the compressor.
2.2 Selecting Operation Mode
Press the MODE key to select the type of operating mode. Consecutive press of the key switches the
operation over "COOL", "HEAT", "AUTO" and "FAN"
2.3 SAVE Mode
Press the SAVE key to select the energy saving function. This option is only available for "COOL",
"HEAT" and "AUTO" modes.
2.4 Auxiliary Electric Heater
If the "HEAT" mode provides insufficient heating to a room even at the highest temperature setting
(30°C), press the HEATER key to activate the auxiliary electric heater. For models with two heaters,
consecutive press of the key allows the selection of one or both heaters active.
2.5 Temperature Setting
To set the desired room temperature, press
temperature in the range of 16°C to 30°C.
Press both
2.6 Time Setting
Real time Clock
Press the CLOCK key once to activate set clock mode.
Press again to disable set clock mode.
Under set clock mode, the time of the present day can be set by pressing the respective MINUTE,
HOUR and DAY key.
7-days timer
Press the ON TIMER key to activate auto-ON timer mode. Under this mode, press the respective
MINUTE, HOUR and DAY key to select the time of the week when the air-conditioning unit is to
automatically start running. Press the ON TIMER key again to save the setting.
Press the OFF TIMER key to activate auto-OFF timer mode. Under this mode, press the respective
MINUTE, HOUR and DAY key to select the time of the week when the air-conditioning unit is to
automatically stop running. Press the ON TIMER key again to save the setting.
Then to activate the 7-days timer, press and hold the TIMER ACTIVE key until the word "TIMER
ACTIVE" appears on the LCD screen. Repeat the same step to disable the 7-days timer.
2.7 Other Function
Key Lock
Press the MINUTE key 3 times consecutively to activate the key lock. A "KEY LOCK" symbol will
appear on the LCD screen. At this point, only the ON/OFF key is valid.
To disable the key lock, again press the MINUTE key 3 times consecutively.
Test run
Press the TEST key 2 times consecutively to test run the unit.
3. ERROR CODE
When the system is on and an error occurs, the ON/OFF LED on the LCD panel will blink and an error
code is shown. When the system is off and there is a thermistor error, the ON/OFF LED is off but the
error code is still displayed. Each error code represents different message as below
and simultaneously to toggle between °C and °F setting.
or to increase or decrease the set
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