Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin CTXU25G2V1B Service Manual

Control Specification
3.7

Freeze-up Protection Control

Outline During cooling operation, the signals being sent from the indoor unit allow the operating
frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from
the indoor unit must be divided into the zones as the followings.
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 sec from
operation start and after 30 sec from changing number of operation room.
Control in Each Zone
3.8

Heating Peak-cut Control

Outline During heating operation, the signals being sent from the indoor unit allow the operating
frequency limitation and prevent abnormal high pressure. (The signal from the indoor unit must
be divided as follows.)
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 min from
operation start and
Control in Each Zone
The maximum value of heat exchange intermediate temperature of each indoor unit controls the
following (excluding stopped rooms).
34
(Reference)
13˚C
Reset zone
7˚C
Up zone
5˚C
Keep zone
3˚C
Drooping zone
0˚C
Stop zone
sec from changing number of operation room.
When increase 30
When decrease 2
Heat exchanger
thermistor temperature
(Reference)
65˚C
55˚C
54˚C
52˚C
50˚C
Heat exchanger
thermistor
temperature
SiBE12-908
Return from stop
(R4561)
Stop zone
Drooping zone
Keep zone
Up zone
Reset zone
(R9851)
Function and Control