Additional Functions - Daikin CTXS09GVJU Service Manual

Control Specification

3.16 Additional Functions

3.16.1 Priority Room Setting
Electronic expansion valves are controlled to provide the unit designated as the priority room with
proper distribution considering the capacity of other room units.
(Distribution of capacity: Priority room unit --- ΔD Max., other room units --- ΔD -α)
Note: The operation mode of the priority room unit has precedence.
3.16.2 POWERFUL Operation Mode
Compressor operating frequency is increased to PI Max. (Max. Hz of operating room unit ΣS) and
outdoor unit airflow rate is increased.
3.16.3 Cooling / Heating Mode Lock
Use the S15 connector to set the unit to only cool or heat.
Setting to only heat (H): Short-circuit pins 1 and 3 of the connector <S15>.
Setting to only cool (C): short-circuit pins 3 and 5 of the connector <S15>.
The following specifications apply to the connector housing and pins.
JST products Housing: VHR-5N
Note that forced operation is also possible in COOL / HEAT mode.
58
Setting method
Turn off the circuit breaker before changing the setting.
Only one room can be set as the priority room (By turning ON one of A to D of SW4 on service
monitor PCB).
Control start conditions
Priority room setting is made.
AND
Powerful signal from the priority room unit is received.
Cancellation of control
The control function is canceled when the Powerful operation mode is switched off or 20
minutes elapses after Powerful Operation started.
room
Living
room
C
room
The prioritized room will be heated/cooled much more quickly.
Pin: SVH-21T-1, 1
A
B
room Living
room
Normal
operation
COOL mode (C)
HEAT mode (H)
5<C>3<H>1
(R1397)
A
room
B
room
C
When Inverter
room
powerful-operation
is selected in the
priority room
(R1396)
Function and Control
SiUS12-814