Special Functions; Low Noise Mode; Demand Function; Error And Compressor Operation Monitoring Function - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

9-5. SPECIAL FUNCTIONS

9-5-1. 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 (optional parts) on the control board of the outdoor unit.
• The capacity may be insufficient according to the outdoor temperature and conditions, etc.
1 Complete the circuit as shown when using the external input adapter (PAC-SC36NA). (Optional parts)
A
E ~
SW1
X
F
9-5-2. Demand function (on-site modification) (Fig. 9-2)
• It is possible to reduce electricity consumption within a range from 0 to 100 % 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, optional parts).
1 Incorporate the "Adapter for external input (PAC-SC36NA)" into the circuit as shown in the diagram below.
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.
Power consumption when SW2 is on
SW7-1
0% (Forced compressor stop)
OFF
50%
ON
A
~
E
SW2
Y
F
9-5-3.Error and compressor operation monitoring function (CN51)
A B
X
L
1
Y
~
L
2
E
F
9-5-4. Auto change over - Operation mode locking function by external signal (CN3S)
A B
E SW1
~
X
X
SW2
Y
Y
F
B C
H
1
X
I
2
3
J
G
B C
H
1
I
2
J
Y
3
G
C
D
X
CN51
Y
5
5
4
3
1
G
C
D
CN3S
1
1
2
3
3
G
A Remote control panel
D
B Relay circuit
C External input adapter (PAC-SC36NA)
1 D Outdoor unit control board
E Replay power supply
3
CNDM
Fig.9-1
A Remote control panel
D
B Relay circuit
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
1
E Replay power supply
3
CNDM
Fig.9-2
A Distant control board
B Relay circuit
C External output adapter (PAC-SA88HA-E)
D Outdoor unit control board
L : Error display lamp
1
L : Compressor operation lamp
2
X, Y : Relay (Coil standard of 0.9W or less for DC 12V)
X, Y : Relay (DC1mA)
Fig.9-3
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
ON
SW1 Heating
Validity of SW1 Invalidity of SW1
SW2
w The indoor unit, which is operating in the mode different from
the one determined by external signal (CN3S), will be a state of standby.
w The setting becomes effective when the outdoor unit is under stop.
w The operation mode specified by test run will be prior to the mode of this function.
Fig.9-4
52
F Procure locally
G Max. 10m
H Orange
I Brown
J Red
F Procure locally
G Max. 10m
H Orange
I Brown
J Red
E Lamp power supply
F Procure locally
G Max. 10m
E Relay power supply
F Procure locally
G Max. 10m
OFF
Cooling