Freeze-Up Protection Control - Daikin 4MXL-T Series Service Manual

SiUS121827E
4.7

Freeze-up Protection Control

4.7.1 Freeze-up Protection Control (Except FDMQ Series)
Applicable
FTXR09/12/18TVJUW(S)
Models CTXG09/12/18QVJUW(S)
CTXS07LVJU
FTXS09/12/15/18/24LVJU
FDXS09/12LVJU
CDXS15/18/24LVJU
FVXS09/12/15/18NVJU
FFQ09/12/15/18Q2VJU
Outline
During cooling operation, the signal sent from the indoor unit determines the frequency upper limit
and prevents freezing of the indoor heat exchanger. The signals from the indoor unit is divided into
zones.
Details The operating frequency limitation is judged with the indoor heat exchanger temperature.
Part 4 Functions and Control
(Reference)
13°C (55.4°F)
Reset zone
9.5°C (49.1°F)
Up zone
7.5°C (45.5°F)
Keep zone
5.5°C (41.9°F)
Dropping zone
0°C (32°F)
Stop zone
Indoor heat exchanger
temperature (R2T)
Control Specification
R4003451
111