Special Functions - Mitsubishi Electric MXZ-8B48NA Manuel D'installation

9. Special Functions

X
X
SW1
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Relay power supply
Fig. 9-1
Y
SW2
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Relay power supply
Fig. 9-2
L1 L2
X
Y
X Y
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
X Y
SW1 SW2
Fig. 9-4
CNDM
1
2
3
Procure locally
Max. 10 m (33 ft.)
Orange
Brown
Red
CNDM
1
2
Y 3
Procure locally
Max. 10 m (33 ft.)
Orange
Brown
Red
CN51
5
4
3
1
CN3S
X
2
3
Y
9.1. Low noise mode (on-site modifi cation) (Fig. 9-1)
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 capacity may be insuffi cient according to the outdoor temperature and condi-
tions, etc.
1 Complete the circuit as shown when using the external input adapter (PAC-
SC36NA). (Option)
9.2. Demand function (on-site modifi cation) (Fig. 9-2)
• It is possible to reduce electricity consumption within a range from 0 to 100 per-
cent 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, option).
1 Incorporate the "Adapter 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 function
(CN51)
A Remote control panel
B Relay circuit
C External output adapter (PAC-SA88HA-E)
D Outdoor unit control board
E Lamp power supply
F Procure locally
G Max. 10 m (33 ft.)
K Orange
L Yellow
M Green
9.4. Auto change over - Operation mode locking func-
tion by external signal (CN3S)
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
E Relay power supply
F Procure locally
G Max. 10 m (33 ft.)
ON
SW1 Heating
SW2 Validity of SW1
* Any indoor unit that is operating in a mode different from the one specifi ed by the
external signal will enter the standby mode.
* The setting becomes effective when the outdoor unit is under stop.
* The operation mode specifi ed for the test run has priority over the mode specifi ed
using this function.
H Orange
I Brown
J Red
OFF
Cooling
Invalidity of SW1
15