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Heating Operation - Mitsubishi Electric PCH-2GKHA Service Manual

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HEATING OPERATION

Heat operation
w15
NO
Initial
HEATING
YES
Vane initial setting
Vane setting notch
NO
YES
Defrosting
NO
Four-way valve ON
YES
Hor adjust
in process
NO
YES
Compressor ON
NO
YES
Compressor
w9
thermostat ON
Allowance cancel
YES
2
NO
Indoor piping
-15!C or lower
YES
Outdoor unit
trouble
FAN SPEED
Very low airflow
Compressor OFF
1
AUTOMATIC COOLING/HEATING OPERATION
Auto COOL/HEAT
operation
w16
NO
Initial mode
YES
w17
NO
> =
T
T0
1
YES
COOL mode
NO
COOL mode
YES
NO
T
< (T0 - 2)
1
YES
YES
After 15min.
T
<(T0-2)
1
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
24
10-minute
NO
compressor
operation
YES
3 min.restart
prevention
Allowance cancel
6 min. restart
w11
prevention
YES
Heating
NO
area
NO
Hot adjust start
FAN STOP
FAN SPEED very low
w11
YES
Airflow area
20 min.elaspe
Compressor ON
NO
w10
YES
Airflow area
Heating area
NO
w11
NO
Airflow area
Cooling area
YES
Defrost operation
START
Four-way valve
OFF
HEAT mode
NO
T
>(T0 + 2)
1
YES
After 15min.
T
>(T0 + 2)
1
NO
HEAT operation
HEAT operation
1
11
YES
Heating area
NO
Defrost release
NO
Defrost
30 min. elapse
2
YES
Outdoor unit trouble
1
B
YES
Indoor piping
55!C or lower
NO
A
NO
Auxiliary heater
NO
ON
YES
NO
Indoor piping
60!C or higher
YES
Auxiliary heater OFF
Outdoor unit
Overheat remote
trouble
START
NO
Indoor unit
70!C or higher
YES
NO
Allowance
period
YES
Overload protect
1
YES
Cool mode
set
1
PCH-GKH(S)A
Type
3-minute
Auxiliary heater
OFF
Indoor coil
thermistor is 60!C
or higher
FAN speed
Low notti
Airflow 10% up
YES
Indoor piping
35!C or higher
NO
NO
HOT adjust
6 min. elapse
YES
FAN SPEED
Low
NO
FAN SPEED
Low 2 min.
Auxiliary heater
elapse
thermostat ON
YES
YES
FAN SPEED
setting nitch
Auxiliary heater ON
Hot adjust
release
6-minute restart
prevention
Allowance set
Compressor OFF
A
NO
NO
NO
NO
NO
NO
YES
FAN setting notch
B

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