Mitsubishi Electric M Series Manual page 296

CEILING CASSETTE MLZ-KA·VA Series
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the left side of the indoor unit indicates the operation state.
Indication
This shows that the air conditioner is
operating to reach the target temperature.
Please wait until the target temperature is obtained.
This shows that the room temperature is
approaching the target temperature.
This shows a state of standby for operation.
(For multi system air conditioner)
a. COOL ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature.
The setting range is 16 ~ 31ºC.
1. Coil frost prevention
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
b. DRY ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention is as same as COOL mode. (a.1.)
c. HEAT ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31ºC.
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room
temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
d. AUTO CHANGE OVER ··· AUTO MODE OPERATION
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1) Initial mode
When unit starts the operation with AUTO operation from off;
• If the room temperature is higher than the set temperature, operation starts in COOL mode.
• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2) Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 degrees
below the set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 degrees
above the set temperature.
NOTE :
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating
in (AUTO), cannot change over to the other operating mode (COOL
C-294
Operation state
Difference between target
temperature and
room temperature
Approximate
2ºC or more
Approximate
2ºC or more
HEAT) and becomes a state of standby.
M series
Lighted
Blinking
Not lighted