Indoor Coil Freeze-Up Protection; Indoor Coil Freeze Up Protection - Daikin E Series Service Manual

SiBE04-624
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) :
Up-area:
Steady area:
Step down area:
Stop area:
Function and Control
Heat exchanger
thermistor temperature
13˚C
7˚C
5˚C
3˚C
0˚C
Frequency settings remain unchanged.
The maximum frequency increases with approximately 2Hz every 90 seconds.
The maximum frequency remains constant.
The maximum frequency decreases with approximately 2Hz every minute.
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)
Control Specification
Return area
Up area
Steady area
Step down
area
Stop area
(R5909)
69