Specifications

SiBE341027 Field Setting from Outdoor Unit
Test Operation 85
2.1.5 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 for
outdoor unit (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 to 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 temperatures.)
3. If necessary, while in "Setting mode 2", select the setting condition (i.e., "06:00", "07:00", or "08:00") for
set item No. 27 (Setting of end time of low night noise operation).
(Use the end time as a guide since it is estimated according to outdoor temperatures.)
4. If necessary, while in "Setting mode 2", set the setting condition for 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 system will be put
into normal operation mode even during night-time.)
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
123C
Demand
External control
adaptor for
outdoor unit
Host computer
monitor panel
or demand
controller
Outside wiring indicated
by dotted line
Low
noise