Gree GMV-ND22C/A-T - After-Sales Emergency Masures; Wiring Diagram

GREE GMV5 INDOOR UNIT SERVICE MANUAL
144
Troubleshooting:
Make sure the IDUs connected with one wired controller belong to the same series.
1.2.19 “LC” Mismatch of IDU and ODU models
Error display:
IDU wired controller and IDU receive light board will display
Error judgment condition and method:
When some IDUs or devices which cannot be identified by some ODUs are installed in the system,
mismatch error of IDU and ODU models will occur.
Possible reason:
■Mismatch of IDU and ODU
Troubleshooting:
When some IDUs or devices which cannot be identified by some ODUs are installed in the system
(E.g. floor heating device is installed in modular DC inverter multiple VRF system), the error will occur.
Please remove the relevant IDU devices or replace the ODU with suitable model.
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.