Mitsubishi Electric Mr.SLIM PEH Series Technical & Service Manual page 25

2. INDOOR UNIT CONTROL
2-1COOL operation
<COOL operation time chart>
Thermostat
Indoor fan
Booster heater
Compressor
w1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this period has ended.
(1) Compressor control
1 3-minute time delay
To prevent overload, the compressor will not start within 3 minutes after stop.
2 The compressor runs when room temperature is higher than set temperature.
The compressor stops when room temperature is equal to or lower than the set temperature.
3 The compressor stops in check mode or during protective functions.
4 Coil frost prevention
To prevent indoor coil frost, the compressor will stop when the indoor coil thermistor (RT2) reads 1: or below after the
compressor has been continuously operated for at least 16 minutes or more. When the indoor coil temperature rises to
10°C or above, the compressor will start after a 3-minute time delay.
NOTE : By turning OFF the dipswitch SW1-5 on indoor controller board, the start temperature of coil frost prevention
changes from 1: to -3:.
5 Coil frost pretection
When indoor coil temperature becomes -15: or below,coil frost protection will proceed as follows.
<Start condition>
After the compressor has been continuously operated for 3 minutes or more,and the indoor coil temperature has been -
15: or below for 3 minutes,the coil frost protection will start.
<Coil frost protection>
Compressor stops for 6 minutes,and then restarts.
If the start condition is satisfied again during the first 10 minutes of compressor operation,both the indoor and outdoor units
stop,displaying a check code of "P8"on the remote controller.
<Termination conditions>
Coil frost protection is released when the start condition is not satisfied again during the allowance,or when the COOL
mode stops or changes to another mode.
(2) Indoor fan control
Indoor fan speed LOW/HIGH depends on the remote controller setting.
However,if an outdoor unit abnormality is detected,the indoor fan speed will be LOW, regardless of the remote controller
setting.
FILTER
CHECK MODE
TEST RUN
Operation starts by
P O W E R b u t t o n
ON.
ON
OFF
LOW or HIGH
ON
OFF
ON
OFF
OFF
ON
OFF
<How to operate>
1 Press POWER ON/OFF button.
2 Press the
3 Press the
TEMP button to set the desired temperature.
NOTE: Set temperature changes 1°C when the
button is pressed one time.
Cooling 19 to 30°C
Room temperature Room temperature
becomes equal to rises above set
set temperature. temperature.
Minimum 3 minutes w1
button to display " "
Operation stops by
P O W E R b u t t o n
OFF.
LOW or HIGH
or
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