Defrost Control - Panasonic U-8MF2E8 Service Manual

9. Defrost Control

9-1. Defrost Methods
This system uses the following 2 defrosting systems.
System employs
1 outdoor unit in the refrigerant system
2 or more outdoor units in the refrigerant system
1
9-2. Constraint Conditions
Frost detection does not occur for 10 minutes after operation starts.
Defrost does not begin again for 40 minutes of operation after defrost was once completed.
If all indoor units are stopped while defrosting, or if the outdoor unit is stopped due to protection control or
another reason, then defrost control will not start for a minimum of 5 minutes after restart occurs.
Time until next defrost permission when defrost was completed is changed according to the ambient temperature.
Ambient temperature
Minute
EEPROM setting in main outdoor unit
CODE: A3
Setting No.
20
21
40
41
90
To < _ -10°C
XX + 6
XX
20
21
Interval of "1"
40 (factory preset mode)
Never use
Defrost control method
Reverse cycle defrost
Outdoor unit cycle defrost
< _
-10 < To -5°C
XX + 3
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3WAY SYSTEM
Control Functions
-5°C < To
XX