MULTI VRF-Ⅱ INDOOR UNIT SERVICE MANUAL EUROPEAN/LATIN AMETICA (R410A)
112
MAINTENANCE
1 Troubleshooting
1.1 Malfunction list for the wired controller
2 After-sales Emergency Masures
When some unrecoverable fault occurs to one module which is connected with several others in
parallel, the following emergency measures are recommended to guarantee the heating or cooling
capacity of the indoor units and the service life of modules except the faulted one are not affected.
Step 1: set all indoor units under “Off” mode and cut off the power supply to the indoor and outdoor units.
Step 2:.shut off all cutoff valves of the faulted outdoor unit, including the cutoff valves of the liquid/gas
pipe as well as the oil balancing valve.
Step 3: cut off the air switch of the module.
Step 4: remove the communication line between the faulted module and other modules which are still
kept connected through the communication line.
Step 5: readjust the address and quantity settings on the main board of the modules except the faulted
one.
Step 6: power and restart the unit.
3 Wiring Diagram
NOTE:
This drawing is just for reference; please always refer to the electric wiring stuck to the unit for actual
wiring.
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