Special Functions - Mitsubishi Electric MXZ-8B140VA Technical & Service Manual

8-5. SPECIAL FUNCTIONS

8-5-1. Low noise mode (on-site modification) (Fig. 8-1)
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)
~
SW1
X
8-5-2. Demand function (on-site modification) (Fig. 8-2)
• 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.
SW7-1 Power consumption when SW2 is on
0% (Forced compressor stop)
OFF
ON 50%
~
SW2
Y
8-5-3. Error and compressor operation monitoring function (CN51)
X
L
1
Y
~ L
2
8-5-4. Auto change over - Operation mode locking function by external signal (CN3S)
SW1
~
X
X
SW2
Y
Y
OCH480A
1
X
2
3
1
2
Y
3
X
CN51
Y
5
4
3
CN3S
1
2
3
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Replay power supply
CNDM
Fig. 8-1
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Replay power supply
CNDM
Fig. 8-2
Distant control board
Relay circuit
External output adapter (PAC-SA88HA-E)
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. 8-3
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
ON
SW1 Heating
Validity of SW1 Invalidity of SW1
SW2
The indoor unit, which is operating in the mode different from
the one determined by external signal (CN3S), will be a state of standby.
The setting becomes effective when the outdoor unit is under stop.
The operation mode specified by test run will be prior to the mode of this function.
Fig. 8-4
34
Procure locally
Max. 10m
Orange
Brown
Red
Procure locally
Max. 10m
Orange
Brown
Red
Lamp power supply
Procure locally
Max. 10m
Relay power supply
Procure locally
Max. 10m
OFF
Cooling