73
Special function
(a) Low-level sound priority mode (Local wiring)
Unit enters into Low-level sound priority mode by external signal input setting.
Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual.
Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand
input located on the outdoor controller board enables to control compressor operation frequency.
W
The performance depends on the load of conditioned outdoor temperature.
How to wire
1) Make the circuit as shown above with Adaptor for external signal input (PAC-SC36NA).
2) Turn SW1 to on for Low-level sound priority mode.
Turn SW1 to off to release Low-level sound priority mode and normal operation.
(b) Demand control (Local wiring)
Demand control is available by external input. In this mode, power consumption is decreased within the range of usual
0~100%.
How to wire
Basically, the wiring is the same as (a).
Connect an SW1 which is procured at field to the between Orange and Red (1 and 3) of the Adaptor for external signal
input (PAC-SC36NA), and insulate the tip of the brown lead wire.
It is possible to set it to the following power consumption (compared with ratings) by setting the SW7-1, 2.
SW7-1
SW7-2
OFF
0% (Operation stop)
75%
50%
OFF
ON
OFF
OFF
ON
Power consumption
(SW1 on)
CNDM
X
SW1
~
X
Max. 10 m[33ft] including local wiring
SW1 : Switch
X : Relay (Contact spec. : DC1mA)
Relay
supply
Red 3
Brown 2
Orange 1
Purchased locally
Adaptor for external
signal input
(PAC-SC36NA)
Outdoor unit
controller board
Insulate this point securely as
this is not used.
<Low-level sound priority mode circuit>
OCH481C
