Heating Peak-Cut Control; Fan Control - Daikin CTXU25G2V1B Service Manual

SiBE12-908
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 minutes 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).
3.9

Fan Control

Outline Fan control is carried out according to the following conditions.
1. Fan ON control for electric component cooling fan
2. Fan control when defrosting
3. Fan OFF delay when stopped
4. ON/OFF control when cooling operation
5. Fan control when the number of heating rooms decreases
6. Fan control when forced operation
7. Fan control in indoor / outdoor unit quiet operation
8. Fan control during heating operation
9. Fan control in the POWERFUL mode
10.Fan control for pressure difference upkeep
Detail Fan OFF Control when Stopped
Tap Control in Indoor / Outdoor Unit Quiet Operation
1. When Cooling Operation
2. When Heating Operation
Function and Control
seconds from changing number of operation room.
When increase 30
When decrease 2
Fan OFF delay for 60 seconds must be made when the compressor is stopped.
When the outdoor air temperature is higher than 37°C, the fan tap must be set to H.
When the outdoor air temperature is 18 to 37°C, the fan tap must be set to M.
When the outdoor air temperature is lower than 18°C, the fan tap must be set to L.
When the outdoor air temperature is lower than 4°C, the fan tap must be set to H.
When the outdoor air temperature is 4 to 12°C, the fan tap must be set to M.
When the outdoor air temperature is higher than 12°C, the fan tap must be set to L.
(Reference)
65°C
55°C
54°C
52°C
50°C
Heat exchanger
thermistor
temperature
Control Specification
Stop zone
Drooping zone
Keep zone
Up zone
Reset zone
(R9851)
46