Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTKS20D3VMW Service Manual

SiENBE12-713
3.6

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.
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
The zone is determined by the commands from indoor units.
In drooping zone, the frequency decreases 2Hz/20 seconds.
3.7

Heating Peak-cut Control

Outline
Heat Pump Only
During heating operation, the signals being sent form 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 after A sec from changing number of operation room.
Control in Each Zone
The maximum value of heat exchange intermediate temperature of each indoor unit controls the
following (excluding stopped rooms).
In drooping zone, the frequency decreases 6Hz/40 seconds.
In up zone, the frequency increases 2Hz/60 seconds.
Function and Control
Heat exchanger
thermistor temperature
13°C
Reset zone
7°C
Up zone
5°C
Keep zone
3°C
Drooping zone
0°C
Stop zone
A
When increase 30
When decrease 2
65°C
55°C
54°C
52°C
50°C
Heat exchanger
thermistor
temperature
Return from stop
Stop zone
Drooping zone
Keep zone
Up zone
Reset zone
(R6034)
Control Specification
(R4561)
89