1. Switch off the system and isolate the main power supply.
2. Ensure that power supply cannot be switched on during installation.
3. All electrical components must be selected as per local standards and unit requirements.
4. Refer to wiring diagram for electrical connections details.
5. Ensure that the power supply corresponds to the unit characteristics and that the power supply is stable (nominal voltage ±10 % and nominal frequency ±2.5 Hz).
6. Dimension the power supply cables according to unit data for voltage and current.
7. Protect the power supply and ensure correct earthing.
8. Make the power supply according to local standards and legal requirements.
9. The unit includes high and low-pressure switches which, when activated, cut the power supply to the compressor. Parameters for high and low-pressure cut-outs are to be adjusted by the installer, depending on the compressor model, refrigerant and application. For units with a 3-phase scroll compressor, correct phase sequence for compressor rotation direction shall be observed.
10. Determine the phase sequence by using a phase meter to establish the phase order of line phases L1, L2 and L3.
11. Connect line phases L1, L2 and L3 to main switch terminals T1, T2 and T3, respectively.

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