Heating Operation - Mitsubishi Electric PKH18FK3 Technical & Service Manual

HEATING OPERATION

Heat operation
w 15
NO
initial
HEATING
YES
Vane setting
Vane initial
notch setting
NO
YES
defrosting
NO
Four-way
valve ON
YES
Hot adjust
in process
NO
YES
Compressor
ON
NO
Compressor
YES
w 9
thermostat
ON
NO
Allowance
cancel
YES
YES
NO
Indoor piping
5°F or lower
YES
2
Outdoor unit
trouble
FAN SPEED
Very low airflow
Compressor OFF
1
AUTOMATIC COOLING/HEATING OPERATION
Auto COOL/HEAT
operation
w 16
NO
Initial mode
YES
w 17
NO
T1 [ To
YES
COOL mode
NO
COOL mode
YES
NO
T1 [ (To - 4)
YES
YES
After 15min.
T1 [ (To-4)
NO
COOL operation
w15 ( i ) Until Low airflow is set while in hot adjustment
( ii )While defrosting (FAN STOP)
(iii)When thermostat is OFF
In the case of( i ), (ii) and (iii) above, airflow is horizontal regardless the VANE setting.
w16 When AUTO operation is started, COOL or HEAT mode is selected automatically.
w17 T1 : Room temperature.
To : Set temperature.
NO 10-minute
compressor
operation
YES
Allowance cancel
3 min. restart
w 11
prevention
YES
Heating
NO
area
NO
6 min. restart
prevention
FAN STOP
w 11
NO
YES
Fan area
20 min. elaspe
YES NO
w 10
Hot adjust start Fan area
Heating area
FAN SPEED NO
w 11
very low
Fan area NO
Cooling area
Compressor ON
YES
Defrost operation
START
Four-way valve
OFF
HEAT mode
NO
T1 ] (To + 4)
YES
After 15min.
T1 ] (To + 4)
NO
HEAT operation HEAT operation
1
w 11
YES
Heating area
NO
Defrost release
Defrost
NO
30 min. elapse
2
YES
Outdoor unit
trouble
1
B
YES
Indoor piping
131°F or lower
NO
NO Auxiliary
heater ON
A
YES
NO
Indoor piping
140°F or higher
YES
Auxiliary heater
OFF
Overheat remote
Outdoor unit
START
trouble
NO
Indoor Coil. temp.
150°F or higher
YES
NO
Allowance
period
YES
Overload protect
1
YES
Cool mode
set
1
26
Auxiliary heater
thermistor is 140°F
FAN speed
Low notch
Airflow 10% up
YES
Indoor piping
95°F or higher
NO
HOT adjust
5 min. elapse
YES
FAN SPEED
NO
Auxiliary heater
Low
thermostat ON
YES
FAN SPEED
Low 2 min.
Auxiliary heater
elapse
ON
YES
FAN SPEED
setting notch
Hot adjust
release
6-minute restart
prevention
Allowance set
Compressor OFF
A
3-minute
NO
OFF
YES
Indoor coil
NO
or higher
YES
NO
YES
FAN setting notch
B
NO
NO