67
OCH670
(3)Special function
(a) Low-level sound priority mode (Local wiring)
CN31
Types
Connector
Function
Effective timing
Connector
Start
Short
Open
Action by open/ short operation
Emergency operation
When power supply ON
Normal
(2) Function of connector
(b) On demand control (Local wiring)
By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB.
The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to
the CNDM connector (option) on the control board of the outdoor unit.
• The ability varies according to the outdoor temperature and conditions, etc.
1
Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
2
SW7-1 (Outdoor unit control board): OFF
3
SW1 ON: Low noise mode
SW1 OFF: Normal operation
A
Circuit diagram example
(low noise mode)
B
On-site arrangement
C
External input adapter
(PAC-SC36NA-E)
X: Relay
D
Outdoor unit control board
E
Max. 10 m
F
Power supply for relay
A
SW1
Orange
1
3
Brown
Red
E
B
F
CNDM
X
X
C
D
A
Circuit diagram example
(Demand function)
B
On-site arrangement
X, Y: Relay
C
External input adapter
(PAC-SC36NA-E)
D
Outdoor unit control board
E
Max. 10 m
F
Power supply for relay
By performing the following modification, energy consumption can be reduced to 0–100% of the normal consumption.
The demand function will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to
the CNDM connector (option) on the control board of the outdoor unit.
1
Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
2
By setting SW7-1 on the control board of the outdoor unit, the energy consumption (compared to the normal consumption) can
be limited as shown below.
SW7-1
SW2
SW3
Energy consumption
Demand
function
ON
OFF
OFF
100%
ON
OFF
75%
ON
ON
50%
OFF
ON
0% (Stop)
A
SW2
SW3
Orange
1
3
Brown
Red
CNDM
Y
X
X
Y
F
B
E
C
D
