● Setting procedure
The setting of test run (ON/OFF) and its operation mode (cooling/heating) can be set by SW3 on the multi controller circuit
board of outdoor unit.
1 Set operation mode (cooling or heating) by SW3-2.
2 Start test run by setting SW3-1 to ON (
) with the indicated operation mode of SW3-2.
3 Finish test run by setting SW3-1 to OFF ( ).
• Operation mode cannot be changed by SW3-2 during test run.
• To change the test run operation mode, stop the test run by 3-1, and restart test run by
SW3-1 after the mode is changed by SW3-2.
• Test run automatically stops 2 hours later by 2-hour OFF timer function.
• Test run can be performed by the remote controller.
• The remote controller display of test run by outdoor unit is the same as that of test run by
remote controller.
• If test run is set with the outdoor unit, the test run is performed for all indoor units.
• The remote controller operation becomes unavailable once the test run is set with the outdoor unit.
ON
SW3
1 2
A Stop
B Cooling
C Operation
D Heating
A
C D
B
(Initial setting)
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In case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous con-
nection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure
to carry out the test run from remote controller with reference to "(1) Using remote controller."
SW3-1
SW3-2
SW3-1
SW3-2
ON
OFF
ON
ON
Cooling operation
Heating operation
Note: After performing the test run, set SW3-1 to OFF.
• 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 service port due to the small difference in pressure in the pipes. The unit is not faulty.
• After power is supplied or after an operation stops for a while, a small clicking noise may be heard from the
inside of the branch box. The electronic expansion valve is opening and closing. The unit is not faulty.
When a test run is started by “Using SW3 in outdoor unit”, even if it carries out stop instructions by
remote controller, outdoor unit does not stop. A test run is not ended.
In this case, please set SW3 in outdoor unit to off.
Note: Be sure to wait at least 3 minutes after turning on the power supply before setting SW3-1 and SW3-2.
If the DIP switches are set before 3 minutes has elapsed, the test run may not start.
(2) Using SW3 in outdoor unit
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