Mitsubishi PLH-3AKH.UK - Cooling, Dry, and Heat Operation Logic

29
COOL operation
Four-way valve/OFF
Initial
COOLING
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
w 8
w 9
Vane initial
setting
Vane
55 deg downward angle
70 deg downward angle
Fan speed
LOW
Downward
discharge
1 hour
Vane setting notch
Vane horizontal
airflow
Compressor
thermostat
ON
Allowance
cancel
3-minute
time delay
6-minute
time delay
3-minute
compressor
operation
Coil frost
protection
Cooling area
10-minute
compressor
operation
Allowance cancel
Coil frost
prevention
16-minute
compressor
operation
pipe
temperature is
1°C or lower
Compressor ON
1
w 10
w 11
Coil frost
prevention
Compressor OFF
Pipe
temperature is
10°C or higher
Defrosting protection
detection temperature
-1°C or lower
YES
NO
6-minute
time delay
3-minute
time delay
Coil frost
prevention release
Allowance
period
6 minute
time delay
Allowance set
1 min continue
Coil frost protection
FAN speed
LOW
FAN speed
LOW 5 min
elapse
Outdoor unit
trouble
COOLING OPERATION
w8 When operation stops or changes to cooling or dry mode, the auto vane turns to a horizontal angle. If operation changes
during auto vane SWING, the auto vane will continue to swing.
w9 When operating TEST RUN, the thermostat will be continuously ON.
w10 After 3 minute compressor operation, if the pipe temperature thermistor reads -15°C or below for 3 minutes, the compres-
sor will stop for 6 minutes.
w11 Heating area : Pipe temperature is more than 5 degrees above the room temperature.
Cooling area : Pipe temperature is more than 5 degrees below the room temperature.
FAN area : Pipe temperature is within 5 degrees either way of the room temperature.
OC211-A--1.qxp 04.9.28 4:39 PM Page 29