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14.8.5 VFD terminals
All VFD configurations are Unit Mounted (UM).
The incoming cable lug size is determined by the device size.
For unit mounted VFDs, the outgoing terminals are connected in factory to the compressor motor.
For each phase, cables must be equal length within 10% between inverter and motor terminals.
Permitted material for conductors: Copper.
14.8.6 Piping Connections
The inverter panel has two copper pipes on his back in which flows some refrigerant taken from the condenser and released
in the evaporator. This refrigerant flow is needed to cool down the inverter and avoid it to reach an overtemperature.
Fig. 23 - P&ID diagram of the unit with inverter cooling line detail
If inverter panel disconnection is needed it is necessary to avoid that pressure is in these tubes before their removal.
To safely disconnect this line, follow the following steps.
•
Close the highlighted valves (1 in Fig. 23).
•
Extract the refrigerant from both the access fittings (2a and 2b in Fig. 23) and measure the pressure. Be sure that
there is zero pressure in the lines before proceeding with panel removal.
•
Now it is possible to remove the piping from the inverter panel.
Verify that pressure difference between access fitting 2b and access fitting 3 is lower than 2 bar, otherwise provide to filter
replacement.
Failure to remove all refrigerant pressure from the whole refrigerant line can result in the pressure
ejection of components during disassembly operation and cause personal injury.
Any work on refrigerant lines has to be carried out only by trained technicians, please refer to DAIKIN
representative.
