Panasonic U-8MF2E8 Service Manual page 44

9. Defrost Control
E : Evaporator operation
C : Condenser operation
S : Stop or shut off the refrigerant
E→C : Switching from evaporator operation to condenser operation
C→E : Switching from condenser operation to evaporator operation
1
Control time
Defrost
occurs
first
Outdoor
unit(s)
Defrost
occurs
second
Mode
Stop
Fan
Indoor
units
Cooling
Heating
*1 Function when a common use solenoid valve kit is used and there are more than one (1) indoor unit in the
cooling mode within the same solenoid valve kit.
*2 Function when a common use solenoid valve kit is used and there are more than one (1) indoor unit in the
heating mode within the same solenoid valve kit.
*3 Only for High Static Pressure Ducted Type Indoor Unit (Type E1)
Normal
operation
delay-start
-
Heat
E
exchanger
Compressor ON
Fan ON
Heat
E or S
exchanger
Compressor ON or S
Fan ON or S
Thermostat
S
*1(Cooling) S
*2(Heating) S
S
*1(Cooling) S
*2(Heating) S
ON E
OFF S
ON C
OFF C
OFF *3 S
Outdoor unit cycle defrost processing
1st
Outdoor
unit Defrost
group
control
1 min Max 7 min
E→C C
ON ON
OFF OFF
E E
OFF OFF
ON ON
S S
S S
C C
S S
S S
C C
E E
S S
C C
C C
S S
1 - 36
Control Functions
2nd
Defrost
group
1 min Max 8 min 1 min
C→E E
OFF OFF OFF
OFF ON OFF
E→C C C→E
OFF ON OFF
OFF OFF OFF
S S
S S
C C
S S
S S
C C
E E
S S
C C
C C
S S
3WAY SYSTEM
Normal
operation
-
E E
ON
ON
E or S
ON or S
ON or S
S S
S S
C C
S S
S S
C C
E E
S S
C C
C C
S S