Mitsubishi Electric PUZ-HWM140VHA Service Manual page 61

SPECIAL FUNCTION
9.9.1. Low noise mode (on-site modification) (Fig. 9-9-1)
1. Using the CNDM connector (Option)
By performing the following modification, operation noise of the outdoor unit can be
reduced.
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-E). (Option)
2 SW7-1 (Outdoor unit control board): OFF
3 SW1 ON: Low noise mode
SW1 OFF: Normal operation
2. Using remote controller
Refer to the indoor unit installation manual.
9.9.2. Demand function (on-site modification) (Fig. 9-9-2)
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.
1 Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (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
OCH748
SW3 Energy consumption
OFF 100%
OFF 75%
ON 50%
ON 0% (Stop)
61
A
X
X
F
SW1
B
A Circuit diagram example
(low noise mode)
B On-site arrangement
C External input adapter
(PAC-SC36NA-E)
X: Relay
A
X Y
X
F
SW2
SW3
Y
B
A Circuit diagram example
(Demand function)
B On-site arrangement
X, Y: Relay
C D
CNDM
Orange
1
Brown
Red
3
Fig. 9-9-1
E
D Outdoor unit control board
E Max. 10 m
F Power supply for relay
C D
CNDM
Orange
1
Brown
Red
3
Fig. 9-9-2
E
C External input adapter
(PAC-SC36NA-E)
D Outdoor unit control board
E Max. 10 m
F Power supply for relay