Special Functions - Mitsubishi Electric MXZ-8A140VA Installationshandbuch

9. Special Functions

A B
E
SW1
X
X
F
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
E Relay power supply
Fig. 9-1
A B
E
SW2
Y
Y
F
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
E Relay power supply
Fig. 9-2
A B
X
L
1
Y
L
2
E
F
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)
Fig. 9-3
A B
E
SW1
X
SW2
Y
F
Fig. 9-4
14
C
D
H
1
1
I
2
3
3
J
CNDM
G
F Procure locally
G Max. 10 m
H Orange
I Brown
J Red
C
D
H
1
I
1
2
J
3
3
CNDM
G
F Procure locally
G Max. 10 m
H Orange
I Brown
J Red
C
D
X
CN51
Y
5
4
3
G
C
D
CN3S
X
1
2
3
Y
G
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 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)
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).
1 Incorporate the "Adaptor for external input (PAC-SC36NA)" into the circuit as shown
in the diagram on the left.
2 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%
9.3. Error and compressor operation monitoring func-
tion (CN51)
A Distant control board
5
B Relay circuit
C External output adapter
1
D Outdoor unit control board
E Lamp power supply
F Procure locally
G Max. 10m
9.4. Auto change over - Operation mode locking func-
tion by external signal (CN3S)
A Remote control panel
1
B Relay circuit
C External input adapter (PAC-SC36NA)
3
D Outdoor unit control board
E Relay power supply
F Procure locally
G Max. 10m
SW1
SW2 Validity 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.
ON OFF
Heating Cooling
Invalidity of SW1