Noise - Mitsubishi Electric PUHZ-RP35VHA4 Service Manual

(2) Function of connector
Types
Connector
Connector CN31
Special function
(a) Low-level sound priority mode (Local wiring)
By performing the following modifi cation, 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.
1 Complete the circuit as shown when using the external input adapter (PAC-SC36NA). (Option)
2 SW7-1 (Outdoor unit control board): OFF
3 SW1 ON: Low noise mode
SW1 OFF: Normal operation
A
X
SW1
(b) On demand control (Local wiring)
By performing the following modifi cation, 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.
1 Complete the circuit as shown when using the external input adapter (PAC-SC36NA). (Option)
2 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
A
X Y
X
SW2
SW3
Y
Function
Emergency operation
C D
CNDM
Orange
X
Brown
Red
SW3 Energy consumption
OFF 100%
OFF 75%
ON 50%
ON 0% (Stop)
C D
CNDM
Orange
Brown
Red
Action by open/ short operation
Short
Start
A Circuit diagram example
(low noise mode)
1
B On-site arrangement
3 C External input adapter
(PAC-SC36NA)
A Circuit diagram example
1 (Demand function)
B On-site arrangement
3
X, Y: Relay
82
Effective timing
Open
When power supply ON
Normal
X: Relay
D Outdoor unit control board
E Max. 10 m
F Power supply for relay
C External input adapter
(PAC-SC36NA)
D Outdoor unit control board
E Max. 10 m
F Power supply for relay