Defrost Detection And Release; Ct (Peak Current Cut-Off Control) - Sanyo SAP-KRV96EHDS Technical & Service Manual

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.

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.
Peak current cut-off trips
Hz down
NOTE Electrical current setting for COOL operation is
used during DEFROST 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.
Mode : Cooling
Cut-off action
Low ambient temp.
cut-off
Mode : Heating
Cut-off action
High ambient temp.
cut-off
Low ambient temp.
cut-off
42
Cooling Dry Heating
12.0
8.5
Thermo-off Thermo-on
t : ambient temp t : ambient temp
-20 °C t > -16 °C
t
Thermo-off Thermo-on
t : ambient temp t : ambient temp
33 °C t < 29 °C
t
-20 °C t > -16 °C
t
(A)
8.5