Specifications

SiBE04-624 Control Specification
Function and Control 69
3.9 Indoor Coil Freeze-up Protection
Outline During cooling or dry operation, a malfunction of the unit may cause the indoor heat
exchanger's temperature to drop excessively. To prevent the indoor heat exchanger from
freezing up, the freeze protection function will reduce the compressor's maximum operation
frequency.
Detail The freeze protection function regulates the maximum operation frequency as indicated in the
picture underneath.
When recovering from a total stop (return area) :
z
Frequency settings remain unchanged.
Up-area:
z
The maximum frequency increases with approximately 2Hz every 90 seconds.
Steady area:
z
The maximum frequency remains constant.
Step down area:
z
The maximum frequency decreases with approximately 2Hz every minute.
Stop area:
z
The compressor stops completely and the outdoor unit fan will stop. The indoor unit fan
operates at 590 rpm. The system will stay OFF until the indoor heat exchanger temperature
goes to the reset zone. (13°C)
(R5909)
Heat exchanger
thermistor temperature
13˚C
7˚C
5˚C
3˚C
0˚C
Stop area
Step down
area
Steady area
Up area
Return area