Daikin FTKS20D3VMW, Service Manual, Page: 100 / 355

SiENBE12-713 Control Specification
Function and Control 89
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.
(R4561)
Ret u rn from s top
Re s et zone
He a t exch a nger
thermi s tor temper a t u re
Up zone
Keep zone
Drooping zone
S top zone
0°C
3 °C
5°C
7°C
1 3 °C
A
30
2
When increase
When decrease
(R60 3 4)
Re s et zone
He a t exch a nger
thermi s tor
temper a t u re
Up zone
Keep zone
Drooping zone
S top zone
50°C
52°C
54°C
55°C
65°C