Service manual

12
6 TROUBLESHOOTING
6-1. Test Run
. Caution :
Before operating the unit, check that the wiring, piping, and thermistors are installed and that the switches have been
set.
Refer to the "Test run" section of the indoor units and outdoor unit installation manuals.
After installation of an indoor unit, R-Converter unit, and outdoor unit, begin a test run to check water leaks in the R-Converter
unit.
Be sure to perform a test run in cooling mode for each indoor unit installed. Make sure that each indoor unit operates
properly following the installation manual supplied with the unit.
If a test run is performed on all indoor units at once, improper connection of the refrigerant pipes and the indoor and outdoor
unit connecting wires cannot be detected.
. Caution :
• Always use the remote controller to operate the indoor unit.
• When using an R-Converter unit, operation from the outdoor unit is not possible.
• The following symptoms are not malfunctions.
W See the operation manual of indoor units for details.
WW This mode is activated for approximately 1 minute to help avoid an insufficient supply of refrigerant during heating opera-
tion when refrigerant is stored in an indoor unit that has been turned off or thermo-off.
• A hissing noise can be heard immediately after the air conditioner is started or stopped. This is the sound of the refrigerant
flowing inside R-Converter unit. The problem is insignificant.
Symptom
Indoor unit does not operate
even if set to cooling (heating )
operation
Indoor unit fan stops during
heating operation
Cause
Indoor unit LED display W
The cooling (heating) operation cannot be operated when the
cooling (heating) operation of another indoor unit is operating.
The fan stops during defrosting operation.
Fan stops when the refrigerant collecting mode WW is activated.
When this occurs, the vanes close.
Stand by
(For Multi System)
Stand by
(For Multi System)
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