Midea MV8M-160WV2N1 - Commissioning

V8 Mini R410A VRF 50Hz
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Part 3
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System Design and Installation
10 Commissioning
10.1 Pre-commissioning Checks
Before turning on the power to the indoor and outdoor units, ensure the following:
 Installation
Check if the unit is installed correctly to prevent strange noises and vibrations when the unit starts.
 Field wiring
Based on the wiring schematic and the relevant regulations, make sure the field wiring is based on the instructions
described in Part 3, 8” Electrical Wiring” on connecting wires.
 Earth line
Make sure the earth line is connected correctly, and the grounding terminal is tight.
 Insulation test of main circuit
Use the multimeter of 500V, apply a voltage of 500V DC between the power terminal and the earth terminal. Check
that the insulation resistance is above 2 MΩ. Do not use the multimeter on the transmission line.
 Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or locally installed protection devices comply with the size and type specified in
Part 2,”7 Functional Components and Safety Devices”. Make sure you use fuses and protection devices.
 Internal wiring
Visually inspect if the connections between the electrical component box and the interior of the unit is loose, or if the
electrical components are damaged.
 Piping dimensions and insulation
Make sure the installation piping dimensions are correct, and the insulation work can be carried out normally.
 Stop valve
Make sure the stop valve is open on both the liquid, low pressure and high pressure gas sides.
 Equipment damage
Check for damaged components and extruded piping inside the unit.
 Refrigerant leak
Check for refrigerant leaks inside the unit. If there is a refrigerant leak, try to repair the leak. If the repair is not
successful, please call the local agent. Do not come in contact with the refrigerant leaking from the refrigerant piping
connections. It may cause frostbite.
 Oil leak
Check if there is oil leaking from the compressor. If there is an oil leak, try to repair the leak. If the repair is not
successful, please call the local agent.
 Air inlet/outlet
Check for paper, cardboard or any other material that may obstruct the air inlet and outlet of the equipment.
 Add additional refrigerant
The amount of refrigerant to be added to this unit should be marked on the "Confirmation Table” which is placed at
electrical control box front cover.
 Installation date and field settings
Make sure the installation date is recorded on the label of the electric control box cover, and the field settings are
recorded as well.