Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin CTXS09GVJU Service Manual

SiUS12-814
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. The signal from the indoor unit
must be divided into the zones as shown in the following diagram:
Detail
Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from
operation start and after 30 seconds from changing the number of the operation room.
Control in Each Zone
3.7

Heating Peak-cut Control

Outline
Heat Pump Only
During heating operation, the signals being sent from the indoor unit allow the operating frequency
limitation and prevent abnormally high pressure. The signal from the indoor unit must be divided as
shown in the following diagram:
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 minutes from
operation start and after (A) seconds from changing number of operation room.
Control in Each Zone
The maximum value of heat exchange intermediate temperatures of each indoor unit controls the
following (excluding stopped rooms):
Function and Control
A
When increase 30
When decrease 2
Control Specification
Keep zone
Dropping zone
Dropping zone
Keep zone
(R4579)
45