Si12-308 Control Specification
Function and Control 109
3.16 Additional Function
3.16.1 Connection Pipe Condensation Preventing Function
This control is intended to adjust the electronic expansion valve opening so that the outdoor unit
gas pipe temperature (GDN) be kept below 8°C.
3.16.2 Priority Room Setting
Electronic expansion valves are controlled to provide the unit designated as the priority room
with the capacity of other room units.
(Distribution of capacity: Priority room unit ---
∆
D Max., other room units ---
∆
D -
α
)
Setting method
Turn off the circuit breaker before changing the setting.
Only one room can be set as the priority room.
Control start conditions
Priority room setting is made.
AND
“Powerful” signal from the priority room unit is received.
Note: The operation mode of the priority room unit has precedence.
Cancellation of control
The control function is canceled when the “Powerful” operation mode is switched off or 20
minutes elapse after “Powerful Operation” started.
3.16.3 Powerful Operation Mode
Compressor operating frequency is increased to P1 Max. (Max. Hz of operating room unit
Σ
S)
and outdoor unit airflow rate is increased.
3.16.4 Voltage Detection Function
Power supply voltage is detected each time equipment operation starts.
C
room
B
room
A
room
Living
room
C
room
B
room
A
room
Living
room
When Inverter
powerful-operation
is selected in the
priority room
Normal
operation
(R1396)
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