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HWE0803A GB
-7- Defrost Operation Control
(1) Starting the defrost operation
The defrost cycle starts when the pipe temperature (TH6), in the following table, or below has continuously been detected for
3 minutes after the integrated compressor operation time of 50 minutes have passed.
If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation
will start by turning on the forced defrost switch (DIP SW2-7).
Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50 minutes
if defrosting took 12 minutes.
In the multiple-outdoor-unit system, all of the outdoor units that are in operation go into the defrost mode simultaneously. The
unit(s) that is stopped at the time defrost operation starts remains stopped.
(2) Defrost operation
Model
TH6
SW3 - 3 OFF SW3 - 3 ON
P72 model - 10°C [14°F] - 5°C [23°F]
P96 model - 8°C [18°F] - 5°C [23°F]
P120 model - 8°C [18°F] - 5°C [23°F]
Outdoou unit Compressor frequency Model Compressor frequency
P72 model 60 Hz
P96 model 65 Hz
P120 model 65 Hz
Outdoor unit fan Stopped
SV1a ON (open)
SV2 ON (open)
SV5b ON (open)
21S4a OFF
SV9 OFF (closed)
BC controller LEV1 G type: 4000, GA type: 6000
LEV3 G type: 1000, GA type: 2000
GB, HB type: 60 (full closed)
SVM1 ON
SVM2 OFF
SV B OFF
SV A Ports that are connected to the indoor units in cooling Thermo-ON
Other ports : OFF