Sanyo SAP-CRV93EHN Technical & Service Manual page 37

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Defrost detection and release
Reverse-Cycle Defrosting
Defrosting Sequence
Heating operation
Outdoor fan ON
4-way valve ON
Frost sensing
Defrost detection occurs in either of the following cases:
•
The temperature of the heat exchanger remains at
or below the L1 line for 3 minutes after the start of
HEAT operation.
• 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.
L2
L1
Frosting area
Reverse-cycle defrosting operation
Compressor 1 minute after it is stopped,
compressor is ON.
Outdoor fan OFF
Indoor fan OFF
4-way valve OFF
Operation lamp Repeatedly switches between red
and orange illumination.
Releasing of defrosting
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.
NOTE
If the air conditioner is turned off during the defrosting
cycle, it will continue defrosting and turn itself off after
defrosting is completed.
0
Ambient temp.
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CT (Peak current cut-off control) CT (Peak current cut-off control)
• This function prevents the circuit breaker or fuse from operating • This function prevents the circuit breaker or fuse from operating
to open the circuit. This function works when electrical current to open the circuit. This function works when electrical current
has increased due to an increase in the cooling / heating load, has increased due to an increase in the cooling / heating load,
or to a decrease in the power supply voltage. In these cases, or to a decrease in the power supply voltage. In these cases,
operation frequency is reduced or operation is interrupted auto- operation frequency is reduced or operation is interrupted auto-
matically to control the electrical current for operation. matically to control the electrical current for operation.
• When the cause of the increase in electrical current is rectified, • When the cause of the increase in electrical current is rectified,
the system will resume operation in the original mode. the system will resume operation in the original mode.
SAP-KRV93, KRV123 SAP-KRV93, KRV123
Peak current cut-off trips Peak current cut-off trips
Hz down Hz down
NOTE NOTE Electrical current setting for COOL operation is Electrical current setting for COOL operation is
used during DEFROST operation. used during DEFROST operation.
CT (Peak current cut-off control)
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.
No. Mode Cut-off action
1 Cooling Low ambient Cut-off Ambient temp. –5°C Ambient temp. –1°C
2 High ambient Cut-off Ambient temp. +40°C Ambient temp. +39°C
Heating
3 Low ambient Cut-off Ambient temp. –20°C Ambient temp. –16°C
(A) (A)
Cooling • Dry Cooling • Dry Heating Heating
12.0 12.0
8.5 8.5 8.5 8.5
Thermo-off Thermo-on