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8. Special functions
A
X
X
F
SW1
B
A Circuit diagram example (low noise mode)
B On-site arrangement
C External input adapter (PAC-SC36NA-E)
X: Relay
Terminal block
DRED (Demand controller)
DRM1
DRM2
DRM3
Common
C
Input:12 VDC, 1 mA
8.3. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
1 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.
2 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 (Fig. 9-1)
E SW 1 - 3 ~ 6
ON
OFF
3
4
5
ON
F SW 1 - 3 ~ 6
OFF
3
4
5
A E
TB1
TB1
TB4
TB4
B
B
TB5
TB5
2
1
C
D
1
Fig. 9-1
10. Specifications
Power supply (V / Phase / Hz)
Dimensions (H × W × D)
mm
Cooling
Sound level *1
dB(A)
Heating
*1 Measured under rated operation frequency.
16
C
D
Orange
CNDM
1
Brown
Fig. 8-1
Red
3
E
D Outdoor unit control board
E Max. 10 m
F Power supply for relay
Outdoor unit control board
CNDM
1
2
WH
3
CN3S
RD
BN
YE
Fig. 8-2
A Outdoor unit
B Indoor unit
C Master remote controller
6
D Subordinate remote controller
E Refrigerant address = 00
F Refrigerant address = 01
6
A
F
230 / Single / 50
943 × 950 × 330(+25)
47
51
8.1. 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 (option) on the
control board of the outdoor unit.
• The ability varies according to the outdoor temperature and conditions, etc.
1 Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
2 SW7-1 (Outdoor unit control board): OFF
3 SW1 ON: Low noise mode
SW1 OFF: Normal operation
* This function cannot be used together with DRED (Demand controller)
8.2. Demand response capabilities
By connecting to the DRED, this air-conditioner will be capable of all three Demand
Response Modes (DRM) based on AS/NZS4755.3.1:2014.
1
Mode
DRM1
Compressor Off.
3
Total electrical energy consumption of the system is not more
DRM2
than 50%.
1
Total electrical energy consumption of the system is not more
DRM3
than 75%.
3
For details, refer to the installation manual of the accessory.
* PAC-SC36NA-E is not available for Demand function.
3 Because the unit automatically stops in about 2 to 3 minutes when the refrigerant
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, refrig-
erant collection is not properly performed. Open the liquid stop valve completely,
and then repeat step 2 after 3 minutes have passed.
* 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.
4 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.
* Set the refrigerant address using the DIP switch of the outdoor unit.
1 Wiring from the Remote Control
This wire is connected to TB5 (terminal board for remote controller) of the indoor
unit (non-polar).
2 When a Different Refrigerant System Grouping is Used.
Up to 16 refrigerant systems can be controlled as one group using the slim MA remote controller.
SW1
Function table
<SW1>
ON
OFF
SW1
1 2 3 4 5 6
function
settings
Description
Operation according to
switch setting
Function
ON
1
Compulsory de-
Start
frosting
2
Error history clear
Clear
3
Refrigerant system
Settings for outdoor unit
4
address setting
addresses 0 to 15
5
6
OFF
Normal
Normal
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