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8. Special Functions
X
X
SW1
Circuit diagram example (low noise mode)
On-site arrangement
External input adapter (PAC-SC36NA-E)
X: Relay
8.2. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
Supply power (circuit breaker).
* When power is supplied, make sure that “CENTRALLY CONTROLLED” is not
displayed on the remote controller. If “CENTRALLY CONTROLLED” is dis-
played, the refrigerant collecting (pump down) cannot be completed normally.
* Start-up of the indoor-outdoor communication takes about 3 minutes after the
power (circuit breaker) is turned on. Start the pump-down operation 3 to 4
minutes after the power (circuit breaker) is turned ON.
* In the case of multi-units control, before powering on, disconnect the wiring
between the master indoor unit and the slave indoor unit. For more details
refer to the installation manual for the indoor unit.
After the liquid stop valve is closed, set the SWP switch on the control board of
the outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor
and outdoor units) start operating and refrigerant collecting operation begins.
LED1 and LED2 on the control board of the outdoor unit are lit.
* Only set the SWP switch (push-button type) to ON if the unit is stopped.
However, even if the unit is stopped and the SWP switch is set to ON less
than 3 minutes after the compressor stops, the refrigerant collecting operation
cannot be performed. Wait until compressor has been stopped for 3 minutes
and then set the SWP switch to ON again.
9. System control
Set the refrigerant address using the DIP switch of the outdoor unit.
SW1 Function Setting
Refrigerant
SW1 Setting
address
ON
ON
00
OFF
OFF
3 4 5 6 7
ON
ON
01
OFF
OFF
3 4 5 6 7
ON
ON
02
OFF
OFF
3 4 5 6 7
10. Speci cations
SW40
Sound level (Measured under rated operating frequency)
SPL
Heating dB(A)
Cooling dB(A)
PWL
Heating dB(A)
CNDM
Orange
1
Brown
Fig. 8-1
Red
3
Outdoor unit control board
Max. 10 m
Power supply for relay
Refrigerant
SW1 Setting
address
03
3 4 5 6 7
04
3 4 5 6 7
05
3 4 5 6 7
SW50
45
46
45
46
62
63
8.1. Low noise mode (on-site modi cation) (Fig. 8-1)
By performing the following modi 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 ability varies according to the outdoor temperature and conditions, etc.
Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
SW7-1 (Outdoor unit control board): OFF
SW1 ON: Low noise mode
SW1 OFF: Normal operation
Because the unit automatically stops in about 2 to 3 minutes when the refriger-
ant collecting operation is completed (LED1 off, LED2 lit), be sure to quickly
close the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is
stopped, refrigerant collection is not properly performed. Open the liquid stop
valve completely, and then repeat step
* If the refrigerant collecting operation has been completed normally (LED1 off,
LED2 lit), the unit will remain stopped until the power supply is turned off.
Turn off the power supply (circuit breaker).
* Note that when the extension piping is very long with large refrigerant amount,
it may not be possible to perform a pump-down operation. When performing
the pump-down operation, make sure that the low pressure is lowered to near
0 MPa (gauge).
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst if air etc. get into it.
Note:
a) Up to 6 units can be connected.
b) Select one single model for all units.
c) For Dip switch setting for indoor unit, refer to the indoor unit’s installation
manual.
SW75
SW100
51
54
48
50
69
70
after 3 minutes have passed.
SW120
SW160
54
62
51
58
72
78
SW200
62
60
78
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