Mitsubishi Electric Mr.Slim PUHZ-SHW80VHA Service Manual page 61

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.
NOTE: When the Dip SW 9-1 on the control board of the outdoor unit is ON, set Dip SW9-1 to OFF.
How to wire
<Low-level sound priority mode circuit>
Purchased 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-E).
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 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-E), 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 consumptopn
SW7-1 SW7-2
(SW1 ON)
OFF OFF 0 % (Operation stop)
ON OFF
OFF ON
OCH526
Insulate this point securely as
this is not used.
X
Max. 10 m including local wiring
50 %
75 %
Adapter for external
signal input
Outdoor unit
(PAC-SC36NA-E)
controller board
Red 3
Brown 2
Orange 1
CNDM
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