37
Heating operation
Frost sensing
Reverse-cycle defrosting operation
Defrosting Sequence
Releasing of defrosting
●
●
•
•
Outdoor fan ON
4-way valve ON
●
●
Outdoor heating exchanger temp. is over 20
°
C.
Defrosting operation lasts 12 minutes (maximum).
2 minutes after it is stopped, compressor is ON.
4-way valve is ON. Outdoor fan is ON.
If the air conditioner is turned off during the defrosting
cycle, it will continue defrosting and turn itself off after
defrosting is completed.
●
●
●
●
●
Compressor
➞
1 minute after it is stopped,
compressor is ON.
Outdoor fan
➞
OFF
Indoor fan
➞
OFF
4-way valve
➞
OFF
Operation lamp
➞
●
Reverse-Cycle Defrosting
NOTE
■
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
12.0
Hz down
8.5
8.5
NOTE
(A)
SAP-KRV93, KRV123
■
CT (Peak current cut-off control)
• 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
12.0
Hz down
8.5
8.5
NOTE
(A)
SAP-KRV93, KRV123
■
CT (Peak current cut-off control)
■
CT (Peak current cut-off control)
■
Repeatedly switches between red
and orange illumination.
Defrost detection occurs in either of the following cases:
The temperature of the heat exchanger remains at
or below the L2 line for 120 minutes after the start
of HEAT operation.
Outdoor heat
exchanger temp.
Ambient temp.
0
L1
L2
Frosting area
The temperature of the heat exchanger remains at
or below the L1 line for 3 minutes after the start of
HEAT operation.
Operation Cut-off Control in
Abnormal Ambient Temperature
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.
•
1 Cooling Low ambient Cut-off Ambient temp. –5
°
C
Ambient temp. –1
°
C
No. Mode
Cut-off action
Thermo-off
Thermo-on
2
Heating
High ambient Cut-off Ambient temp. +40
°
C Ambient temp. +39
°
C
3
Low ambient Cut-off Ambient temp. –20
°
C Ambient temp. –16
°
C
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