Function Of Connector; Special Function; Low-Level Sound Priority Mode; On Demand Control - Mitsubishi Electric PUHZ-SW75VHA Service Manual

(2) Function of connector

Types
Connector
Connector CN31

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.
<Low-level sound priority mode circuit>
How to wire
Insulate this point securely as
this is not used.
Purchased locally
Relay
supply
~
SW1
X
SW1 : Switch
X : Relay (Contact spec. : DC1mA)
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) On 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 SW 1 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.
Power consumption
SW7-1 SW7-2
(SW1 on)
OFF OFF 0% (Operation stop)
ON OFF
OFF ON
OCH533A
Function
Emergency operation
X
Max. 10 m including local wiring
50%
75%
Action by open/ short operation
Short
Start
Adaptor for external
signal input
Outdoor unit
(PAC-SC36NA)
controller board
Red 3
Brown 2
Orange 1
CNDM
53
Effective timing
Open
When power supply ON
Normal