Sanyo C3082, C3682 Protective Functions, Freeze prevention, CT Peak current cut-off control

7-2. Protective Functions

Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

1.Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 41°F(5°C).

2.Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 46°F(8°C) or above.

exchanger	46				C
°F(°C)	(8)		A	B
temperature	41
	(2)
heat	(5)
	36
Indoor		*
		a	b	c	d

a.Area: Automatic capacity control

b.When the temperature drops below Point A, the operation frequency is reduced by a certain proportion.

c.Area: Frequency increase is prohibited.

d.When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area.

*When the temperature drops to below 36°F(2°C) (continuously for 2 minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

Compressor discharge temperature control

This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature.

Compressor discharge temperature °F(°C)

Approx.	A
214
(101)
Approx.			B
201
(94)
a	b	c	d

a.Area: Automatic capacity control.

b.When the temperature rises above Point A, the operation frequency is reduced at a specified rate.

c.Area: Further frequency increase is prohibited.

d.When the temperature falls below Point B, prevention of a rise in frequency is released and the air conditioner operates as in a area.

*The compressor will stop if the temperature of the compressor discharge exceeds 248°F(120°C) due to shortage of gas or other reason.

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 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.

< KS3082 >		(A)
	Cooling	Dry
Peak current cut-off trips	25.0
Hz down	22.0
< KS3682>		(A)
	Cooling	Dry
Peak current cut-off trips	25.0
Hz down	24.0

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