15
9. Special Functions
Remote control panel
Relay circuit
External input adapter
(PAC-SC36NA)
Outdoor unit control board
Relay power supply
Procure locally
Max. 10 m
Orange
Brown
Red
9.1. Low noise mode (on-site modification) (Fig. 9-1)
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 capacity may be insufficient according to the outdoor temperature and condi-
tions, etc.
Complete the circuit as shown when using the external input adapter (PAC-
SC36NA). (Option)
Fig. 9-1
Remote control panel
Relay circuit
External input adapter
(PAC-SC36NA)
Outdoor unit control board
Relay power supply
Procure locally
Max. 10 m
Orange
Brown
Red
Fig. 9-2
9.3. Error and compressor operation monitoring func-
tion (CN51)
Remote control panel
Relay circuit
External output adapter (PAC-SA88HA-E)
Outdoor unit control board
Lamp power supply
Procure locally
Max. 10m
Orange
Yellow
Green
L1 :
Error display lamp
L2 :
Compressor operation lamp
X, Y :
Relay (Coil standard of 0.9W or less for DC 12V)
X, Y :
Relay (DC1mA)
9.4. Auto change over - Operation mode locking func-
tion by external signal (CN3S)
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Relay power supply
Procure locally
Max. 10m
ON
OFF
SW1
Heating
Cooling
SW2
Validity of SW1
Invalidity of SW1
* Any indoor unit that is operating in a mode different from the one specified by the
external signal will enter the standby mode.
* The setting becomes effective when the outdoor unit is under stop.
* The operation mode specified for the test run has priority over the mode specified
using this function.
Fig. 9-3
Fig. 9-4
9.2. Demand function (on-site modification) (Fig. 9-2)
• It is possible to reduce electricity consumption within a range from 0 to 100 percent
by performing the following on-site installation.
The demand function can be enabled by adding a commercially available input
contact point ON/OFF switch to the CNDM connector (the contact point demand
input, sold separately).
Incorporate the “Adaptor for external input (PAC-SC36NA)” into the circuit as
shown in the diagram on the left.
By switching SW7-1 on the control circuit board for the outdoor unit, the following
power consumption restrictions (compared to rated power) can be set.
SW7-1
Power consumption when SW2 is on
OFF
0% (Forced compressor stop)
ON
50%
SW1
CNDM
X
B
C
H
I
J
D
A
E
2
3
1
G
F
X
L1
L2
CN51
B
C
M
L
D
A
E
4
K
3
5
F
G
Y
X
Y
X
SW2
SW1
CN3S
Y
X
B
C
H
I
J
D
A
E
2
3
1
G
F
Y
X
SW2
CNDM
Y
B
C
D
A
E
H
I
J
2
3
1
Y
G
F
Orange
Brown
Red
