Indoor Unit Control - Mitsubishi Electric PE-3EJA Technical & Service Manual

2. INDOOR UNIT CONTROL

2-1 COOL operation
TIMER TEMP
TIMER/TEMP.
POWER
12 29
COOL
11 28
DRY
10 27
FAN
9 26
8 25
UP HIGH
7 24
LOW
6 23
DOWN
5 22
4 21
AUTO
3 20
STOP
2 19
START
1 18
MITSUBISHI ELECTRIC
Steady Flash
<COOL operation time chart>
Thermostat
Indoor fan
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 the room temperature is higher than the set temperature.
The compressor stops when the 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°C or below after the com-
pressor has been continuously operated for 16 minutes or more. The coil frost prevention is released under any of the fol-
lowing conditions.
The indoor coil thermistor rises to 10°C or above.
The room temperature becomes equal to or lower than the set temperature.
COOL mode is stopped or changed to another mode.
NOTE : By cutting the jumper wire JRO2 on the indoor controller board, the temperature to start coil frost prevention changes
from 1°C to -3°C.
5 Coil frost protection
When indoor coil temperature becomes -15°C 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°C or below for 3 minutes, the coil frost protection will start.
<Coil frost protection>
Compressor stops for 6 minutes, and then restarts.
lf the start condition is satisfied again during the first 10 minutes of compressor operation, both the indoor and outdoor
units stop, and the remote controller displays this occurrence.
<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.
<How to operate>
1 Press POWER ON / OFF button.
2 Press MODE SELECT button to set operation mode to COOL.
3 Check
ON/OFF
MODE
NOTES : 1. When
SELECT
FAN
SPEED
2. Set temperature changes by 1°C in the range 18 ~ 29°C each time UP
TIMER
MODE
3. The lighting lamp shows the set temperature, and the flashing lamp
OFF
Operation starts by
P O W E R b u t t o n
ON.
ON
OFF
LOW or HIGH
ON
OFF
ON
OFF
lamp is ON and set desired temperature with UP or DOWN but-
TEMP
ton.
TIMER
lamp is ON, press DISPLAY SELECT button to change
the display to temperature mode.
or DOWN button is pressed.
shows the room temperature.
When the room temperature is equal to the set temperature, the lamp
keeps lighting, 0.5 seconds brightly and 0.5 seconds faintly.
Room temperature Room temperature
becomes equal to rises above set
set temperature. temperature.
MIN. 3 minutes 1
31
Operation stops by
P O W E R b u t t o n
OFF.
LOW or HIGH