Mitsubishi Electric Mr. Slim MSZ-FE09NA Service Manual page 12

INDOOR UNIT DISPLAY SECTION
Operation indicator lamp
MSZ-FE09NA MSZ-FE12NA
The lamps at the center of the indoor unit indicates the operation state.
Lamp
AREA Refer to 8-7.
Lamp lights during operation.
POWER
Lamp blinks in abnormal condition.
MSZ-FE18NA
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication
The unit is operating to
reach the set temperature
The room temperature is
approaching the set tem-
perature
Standby mode
(Only during multi system
operation)
8-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
POWER lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-FE18NA) 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 61 ~ 88°F (16 ~ 31°C).
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from
frosting.
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.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
8-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
POWER lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-FE18NA) 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. (8-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (8-1.2.)
Operation state
Operation state
About 4°F (2°C) or more
away from set tempera-
ture
About 2 to 4°F (1 to 2°C)
from set temperature
Room temperature
-
12
Lighted
Blinking
Not lighted