Field Setting from Outdoor Unit
SiUS281117
Field Setting
87
3.7
Detailed Explanation of Setting Modes
3.7.1 Cool / Heat Mode Switching
The Cool / Heat Mode switching is carried out by remote controller fitted to indoor unit.
This setting is not required for normal operation. (Factory setting)
3.7.2 Setting of Low Noise Operation and Demand Operation
Setting of Low Noise Operation
By connecting the external contact input to the low noise input of the outdoor unit external
control adaptor (optional), you can lower operating noise by 2-3 dB.
A. When the low noise operation is carried out by external contact (with the use of the
external control adaptor for outdoor unit)
1. Connect external control adaptor for outdoor unit and short-circuit terminal of low noise
(Refer below figure).
If carrying out demand or low noise input, connect the adaptor’s terminals as shown below.
2. While in "Setting mode 2", set the setting condition for set item No. 12 (Setting of external
low noise/demand operation) to "YES".
3. If necessary, while in "Setting mode 2", select the setting condition (i.e., "Mode 1", "Mode 2",
or "Mode 3") for set item No. 25 (Setting of external low noise level).
4. If necessary, while in "Setting mode 2", set the setting condition for the set item No. 29
(Setting of capacity precedence) to "ON".
(If the condition is set to "ON", when the air conditioning load reaches a high level, the low
noise operation command will be ignored to put the system into normal operation mode.)
B. When the low noise operation is carried out automatically at night (The external
control adaptor for outdoor unit is not required)
1. While in "Setting mode 2", select the setting condition (i.e., "Mode 1", "Mode 2", or "Mode 3")
for set item No. 22 (Setting of low night noise level).
2. If necessary, while in "Setting mode 2", select the setting condition (i.e., "20:00", "22:00", or
"24:00") for set item No. 26 (Setting of start time of low night noise operation).
(Use the start time as a guide since it is estimated according to outdoor air temperatures.)
Setting
Content
Mode 1
Set the outdoor unit fan to Step 6 or lower.
Mode 2
Set the outdoor unit fan to Step 5 or lower.
Mode 3
Set the outdoor unit fan to Step 4 or lower.
X
X
X
X
X
X
X
X
X
X
F1
F2
P3
P4
1
2
3
C
Demand
External control
adaptor for
outdoor unit
Host computer
monitor panel
or demand
controller
Low
noise
Outside wiring indicated
by dotted line
