Mitsubishi Electric Mr. Slim PUZ-M200YKA2.UK Service Manual page 63

(2) Function of connector
Types Connector
Connector CN31
Special function
(a) Low-level sound priority mode (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.
Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
SW7-1 (Outdoor unit control board): OFF
SW1 ON: Low noise mode
SW1 OFF: Normal operation
X
F
X
SW1
B
(b) On demand control (Local wiring)
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.
Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
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
OFF
ON
Demand
ON
function
ON
OFF
X Y
X
F
SW2
SW3
Y
B
OCH775B
Function
Emergency operation
CNDM
Orange
1
Brown
Red
3
E
SW3 Energy consumption
OFF 100%
OFF 75%
ON 50%
ON 0% (Stop)
CNDM
Orange
1
Brown
Red
3
X, Y: Relay
E
63
Action by open/ short operation
Short
Start
Circuit diagram example
(low noise mode)
On-site arrangement
External input adapter
(PAC-SC36NA-E)
Circuit diagram example
(Demand function)
On-site arrangement
Effective timing
Open
When power supply ON
Normal
X: Relay
Outdoor unit control board
Maximum 10 m
Power supply for relay
External input adapter
(PAC-SC36NA-E)
Outdoor unit control board
Maximum 10 m
Power supply for relay