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51
CN51
X
5
4
3
Y
L
1 : Error display lamp
L
2 : Compressor operation lamp
X, Y : Relay (Coil standard of 0.9W or less for DC 12V)
CN3S
X
Y
SW1
SW2
1
2
3
X, Y : Relay (DC1mA)
SW1
SW2
ON
Heating
Validity of SW1
OFF
Cooling
Invalidity of SW1
Distant control board
Relay circuit
External output adapter (PAC-SA88HA-E)
Outdoor unit control board
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Relay power supply
Procure locally
Max. 10m [33ft]
+ 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.
Lamp power supply
Procure locally
Max. 10m [33ft]
~
~
Y
X
Y
X
L1
L2
Y
CNDM
SW2
1
2
3
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Replay power supply
Procure locally
Max. 10m [33ft]
Orange
Brown
Red
~
Y
SW7-1
Power consumption when SW2 is on
OFF
0% (Forced compressor stop)
ON
50%
Fig. 8-1
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
CNDM
X
1
2
3
Remote control panel
Relay circuit
External input adapter (PAC-SC36NA)
Outdoor unit control board
Replay power supply
Procure locally
Max. 10m [33ft]
Orange
Brown
Red
~
Fig. 8-2
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.
8-5-3. Error and compressor operation monitoring function (CN51)
Fig. 8-3
8-5-4. Auto change over - Operation mode locking function by external signal (CN3S)
Fig. 8-4