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Heating operation
Frost sensing
Non-stop defrosting
Defrosting Sequence
Releasing of defrosting
Outdoor fan ON
4-way valve Heating mode
Frosting is assumed according to the outdoor
temp.,outdoor
heat exchanger
temp.,and
operation time.
Outdoor heating exchanger temp. is over 14 C.
Defrosting operation lasts 12 minutes (maximum).
4-way valve is Heating mode. Outdoor fan is ON.
2-way valve OFF
If the air conditioner is turned off during the defrosting
cycle, it will continue defrosting and turn itself off after
defrosting is completed.
Compressor ON
Outdoor fan OFF
Indoor fan OFF
4-way valve Heating mode
Non-Stop Defrosting
Mode : Cooling
Defrost detection and release
This function prevents the circuit breaker or fuse from operating
to open the circuit. This function works when electrical current
has increased due to an increase in the cooling / heating load,
or to a decrease in the power supply voltage. In these cases,
operation frequency is reduced or operation is interrupted auto-
matically to control the electrical current for operation.
When the cause of the increase in electrical current is rectified,
the system will resume operation in the original mode.
Electrical current setting for COOL operation is
used during DEFROST operation.
Cooling Dry Heating
Peak current cut-off trips 17.5
Hz down 12.2 14.0
(A)
CT (Peak current cut-off control)
Outdoor heat exchanger temp.
Ambient temp.
0
Frosting
area
NOTE
NOTE
The following three protective actions are available to prevent
the compressor from operating with abnormal loads.
At that time, they initiate thermo-off (stopping the outdoor unit)
of the air conditioner.
Cut-off action
Low ambient temp.
cut-off
Thermo-off
t : ambient temp
Thermo-on
t : ambient temp
t
-
22 C t >
-
18 C
Operation Cut-Off Control in abnormal
ambient temperature
2-way valve ON
t 25 C
Mode : Heating
Cut-off action
High ambient temp.
cut-off
Thermo-off
t : ambient temp
Thermo-on
t : ambient temp
t < 24 C
t
-
20 C
Low ambient temp.
cut-off
t >
-
16 C
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