Midea MV8M-120WV2RN1 Engineering Data page 103

10.3 Multi-system Projects
For projects with multiple refrigerant systems, each independent refrigeration system (i.e. each system of one outdoor unit
and its connected indoor units) should be given a test run independently, before the multiple systems that make up a project
are run simultaneously.
10.4 Operating the system
10.4.1 Commissioning test run of single refrigerant system
Once all the pre-commissioning checks in Part 3. "Pre-commissioning Checks" have been completed, a test run should be
performed as described below and a V8 Mini Series System Commissioning Report (see Part 3, 11"Appendix to Part 3 –
System Commissioning Report") should be completed as a record of the operating status of the system during
commissioning.
Note: When running the system for commissioning test runs, if the combination ratio is 100% or less, run all the indoor units
and if the combination ratio is more than 100%, run indoor units with total capacity equal to the capacity of the outdoor
unit.
The test run procedure is as follows:
1. Open the outdoor unit liquid and gas stop valves.
2. Turn on the power to the outdoor unit.
3. If manual addressing is being used, set the addresses of each indoor unit.
4. Leave the power on for a minimum of 12 hours prior to running the system to ensure that the crankcase heaters have
heated the compressor oil sufficiently.
5. Run the system:
a) Run the system in cooling mode with the following settings: temperature 17°C; fan speed high.
b) After one hour, complete Sheet A of the system commissioning report then check the system parameters using
the CHECK button on the outdoor unit's main PCB and complete the cooling mode columns of one Sheet D and
one Sheet E of the system commissioning report for the outdoor unit.
c) Run the system in heating mode with the following settings: temperature 30°C; fan speed high.
d) After one hour, complete Sheet B of the system commissioning report then check the system parameters using
the CHECK button on the outdoor unit's main PCB and complete the heating mode columns of one Sheet D and
one Sheet E of the system commissioning report for the outdoor unit.
6. Finally, complete Sheet C of the system commissioning report.
10.4.2 Commissioning test run of multiple refrigerant systems
Once the commissioning test run of each refrigerant system has been satisfactorily completed as per Part 3. "Commissioning
test run of single refrigerant system", run the multiple systems that make up a project simultaneously and check for any
abnormalities.
V8 Mini R410A VRF 50Hz
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