Freeze-Up Protection Control - Daikin RMXS-L Series Service Manual

SiUS181305E
4.5

Freeze-up Protection Control

Outline
According to the freeze prevention status sent from the BP unit, the compressor output frequency is
regulated to decrease compressor capacity in order to prevent the indoor heat exchanger from
freezing.
Detail
Zones are divided based on the freeze prevention status signal sent from the BP unit (indoor unit),
and the freeze prevention control prevents freezing of the indoor unit.
Recovery zone: Lift the control
Increase zone: 1 step up / 60 sec.
Keep zone: Frequency is not controlled
Decrease zone: 1 step down / 60 sec.
Stop zone: Thermostat-OFF (only the target indoor unit)
The temperature in the above figure depends on the model (reference value).
Function
˚F ˚C
55.4 13
44.6 7
41 5
37.4 3
32 0
Protection Control
Recovery zone
Increase zone
Keep zone
Decrease zone
(R19085)
54