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8
MICROPROCESSOR CONTROL
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
ON/OFF (operate/stop) button
Fan speed control button
Operation select button
Timer mode select button
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
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
8-1. 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 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.
OBH685
Operation state
Room temperature
About 4°F (2°C) or more
away from set tempera-
ture
About 2 to 4°F(1 to 2°C)
from set temperature
Temperature buttons
ECONO COOL button
Vane control button
Time set buttons
Lighted
Blinking
Not lighted
12
RESET button
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Troubleshooting
