9
7.2. Test run
7.2.1. Using SW4 in outdoor unit
1) PUH Type
SW4-1
ON
Cooling operation
SW4-2
OFF
SW4-1
ON
Heating operation
SW4-2
ON
2) PU Type
SW4-1
ON
Cooling operation
SW4-2
OFF
* After performing the test run, set SW4-1 to OFF.
• After power is supplied, a small clicking noise may be heard from the inside of
the outdoor unit. The electronic expansion valve is opening and closing. The unit
is not faulty.
• A few seconds after the compressor starts, a clanging noise may be heard from
the inside of the outdoor unit. The noise is coming from the check valve due to
the small difference in pressure in the pipes. The unit is not faulty.
• A low knocking sound might be heard from the Fan Section of this unit during
the test run.
This is caused by the torque fluctuating to control the Fan revolutions. This is not
a detect in the unit.
The test run operation mode cannot be changed by DIP switch SW4-2 during
the test run. (To change the test run operation mode during the test run, stop
the test run by DIP switch SW4-1. After changing the test run operation mode,
resume the test run by switch SW4-1.)
7.2.2. Using remote controller
Refer to the indoor unit installation manual.
1 2 3 4 5 6
8. Special Functions
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 SW1-1 on the control board of the out-
door unit to ON. The compressor (outdoor unit) and ventilators (indoor and out-
door units) start operating and refrigerant collecting operation begins. LED1 and
LED2 on the control board of the outdoor unit are lit.
* Only set SW1-1 to ON if the unit is stopped. However, even if the unit is
stopped and SW1-1 is set to ON less than three minutes after the compressor
stops, the refrigerant collecting operation cannot be performed. Wait until com-
pressor has been stopped for three minutes and then set SW1-1 to ON again.
* 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 re
-
mote controller.
Note:
In single refrigerant system (twin/triple), there is no need of wiring
2
.
A
Outdoor unit
B
Indoor unit
C
Master remote controller
D
Subordinate remote controller
E
Standard 1:1 (Refrigerant address = 00)
F
Simultaneous twin (Refrigerant address = 01)
G
Simultaneous triple (Refrigerant address = 02)
E
SW 1 - 3 ~ 6
F
SW 1 - 3 ~ 6
G
SW 1 - 3 ~ 6
3
Because the unit automatically stops in about two to three minutes when the re-
frigerant 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
2
after three 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.
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.
9. System control (Fig. 9-1)
Fig. 9-1
SW1
Function table
<SW1>
Function
Operation according to switch setting
ON
OFF
SW1
function
settings
1 Compulsory
defrosting
Start
Normal
2 Error history
clear
Clear
Normal
3
4
5
6
Refrigerant
system ad-
dress setting
Settings for outdoor unit addresses
0 to 15
TB1
A
G
F
A
A
E
B
B
B
B
B
B
D
C
TB1
TB1
TB4
TB5
TB4
TB5
TB4
TB4
TB5
TB4
TB4
1
1
2
ON
OFF
ON
OFF
ON
OFF
3 4 5 6
3 4 5 6
3 4 5 6
ON
OFF
2
7. Test run
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