Function Of Connectors And Switches; Special Function; Low-Level Sound Priority Mode; How To Wire - Mitsubishi Electric PUHZ-RP250YHA2 Service Manual

(2) Function of connectors and switches

Connector
Types
Switch
Connector CN31
SW6-1
SW6-2
SW6-3
SW6-4
SW6
SW6-5
SW5-6
SW6-6
SW6-7
SW6-8
SW5-6

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.
The performance depends on the load of conditioned outdoor temperature.

How to wire

<Low-level sound priority mode circuit>
Insulate this point securely as
this is not used.
Procured locally
Relay
supply
~
SW1
X
SW1 : Switch
X : Relay (Contact spec. : DC1mA)
1) Make the circuit as shown above with adapter 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 same with (a).
Connect an SW 1 which is procured locally between Orange and Red(1 and 3) of the adapter 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
Function
Emergency operation
Model select
X
Max. 10 m including local wiring
50%
75%
Action by open/ short operation
Short
Start
MODEL SW6
ON
200Y
OFF
1 2 3 4 5 6 7 8
ON
250Y
OFF
1 2 3 4 5 6 7 8
Adapter for external
signal input
Outdoor unit
(PAC-SC36NA)
controller board
Red 3
Brown 2
Orange 1
CNDM
61
Effective timing
Open
When power supply ON
Normal
SW5-6
ON
OFF
1 2 3 4 5 6
ON
OFF
1 2 3 4 5 6