SiAF341904E
Field Settings for Outdoor Unit
Part 5 Field Settings and Test Operation
151
2.8 Setting of Night-Time Low Noise Operation and Demand
Operation
Setting of Night-time 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 night-time 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 night-time low
noise operation (Refer below figure). If carrying out demand or low noise input, connect the
adaptor’s terminals as shown below. External control adaptor for outdoor unit Host computer
Outside wiring indicated monitor panel by dotted line or demand controller
2. While in setting mode 2, set the item 2-12 (External low noise or demand setting) to ON.
3. If necessary, while in setting mode 2, select an external low noise level for the item 2-25.
4. If necessary, while in setting mode 2, set the item 2-29 (Capacity priority setting) 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 night-time low noise operation is carried out automatically (External control
adaptor for outdoor unit is not required)
1. While in setting mode 2, select a night-time low noise operation level for the item 2-22.
2. If necessary, while in setting mode 2, select a starting time of night-time low noise operation
(i.e., 8:00 PM, 10:00 PM, or 12:00 AM) for the item 2-26. (Use the starting time as a guide since
it is estimated according to outdoor temperatures.)
3. If necessary, while in setting mode 2, select an ending time of night-time low noise operation
(i.e., 06:00 AM, 07:00 AM, or 08:00 AM) for the item 2-27. (Use the ending time as a guide since
it is estimated according to outdoor air temperatures.)
4. If necessary, while in setting mode 2, set the item 2-29 (Capacity priority setting) 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
Level 1
Set the outdoor fan to Step 7 or lower.
Level 2
Set the outdoor fan to Step 6 or lower.
Level 3
Set the outdoor fan to Step 6 or lower.
O
u
tside
w
iring indicated
b
y dotted line
External control
adaptor for
o
u
tdoor
u
nit
Host comp
u
ter
monitor panel
or demand
controller
X
X
X
X
F1
F2
P3
P4
F1
F2
P3
P4
X
X
X
X
X
X
1
2
3
C
Demand
Lo
w
noise
