Commissioning - Midea ATOM MDV-V28WDHN1 Manual

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10 Commissioning

10.1 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.
10.2 Pre-commissioning Checks
Before turning on the power to the indoor and outdoor units, ensure the following:
1. All indoor and outdoor refrigeration piping and communication wiring has been connected to the correct
refrigeration system and the system to which each indoor and outdoor unit belongs is clearly marked on each unit or
recorded in some other suitable place.
2. Pipe flushing, gas tightness testing and vacuum drying have been satisfactorily completed as per instructions.
3. All condensate drain piping is complete and a water tightness test has been satisfactorily completed.
4. All power and communication wiring is connected to the correct terminals on units and controllers.
5. No wiring has been connected in a short-circuit.
6. The power supplies to indoor and outdoor units have been checked and the power supply voltages are within ±10%
of the rated voltages for each product.
7. All control wiring is 0.75mm
8. Indoor and outdoor unit field settings have been set as required.
9. The additional refrigerant charge has been added as per Part 3, 7 "Charging Refrigerant". Note: In some
circumstances it may be necessary to run the system in cooling mode during the refrigerant charging procedure. In
such circumstances, points 1 to 8 above should be checked before running the system for the purpose of charging
refrigerant and the outdoor unit liquid and gas stop valves should be opened.
During commissioning, it is important that you:
 Keep a supply of R410A refrigerant at hand.
 Keep the system layout, system piping and control wiring diagrams at hand.
10.3 Commissioning Trial Runs
10.3.1 Commissioning test run of single refrigerant system
Once all the pre-commissioning checks in Part 3, 10.2 "Pre-commissioning Checks" have been completed, a test run should
be performed as described below and an Atom 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
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three-core shielded cable and the shielding has been grounded.
Atom B Series VRF 50/60Hz
103