Installation Operation Maintenance

InstallationElectrical connectionThe electric panel is located in theunit compressor section. Removethe compressor access panel. Theunit is designed to run with 400 V+/- 5%/50 Hz/ 3 ph.Factory supplied disconnect switch(option)The disconnect switch is factorymounted. It is located in thecompressor section. Mount thedisconnect switch onto the exteriorof the unit, between the condensercoil and the electrical panel (nearthe unit top corner). Wire thedisconnect switch from the powerterminal block in the panel to thedisconnect switch with the wirebundle provided by following theelectrical diagram found in the unit.Figure 13 - Power supplyOver current protectionThe branch circuit feeding the unitmust be protected in accordancewith national or local codes andmaximum unit amps indicated inTable 36.Power wiringThe unit's power supply must beprovided by 4-wire cable with crosssectionalareas complying withlegislation.The power supply cables must belaid in leak-tight pipes and passthrough the bottom of the electricpanel for units without electricheaters and through the heatsection when electric heater optionis selected. The cables must not betaut.Appropriate connectors must beprovided. Flexible pipe supports arerequired to prevent noisetransmission in the building'sstructure. Ensure all the connectionsare tightened.Note:1. Earthing must be executed incompliance to national and locallegislation.2. The machines are designed for ashort-circuit current of 10 kA. Inthe event of a higher application,contact your local sales office.Compressor electrical phasingProper phasing of the electricalpower wiring is critical for properoperation and reliability of the scrollcompressor and fans.Proper rotation of the scrollcompressor must be establishedbefore the unit is started. This isaccomplished by confirming thatthe electrical phase sequence of thepower supply is correct. The motoris internally connected for clockwiserotation with the inlet power supplyphased A,B,C.The direction of rotation may bereversed by interchanging any twoof the line wires. It is this possibleinterchange of wiring that makes aphase sequence indicator necessaryif the operator is to quicklydetermine the phase rotation of thecompressor motor.11 = Power supply30RT-SVX20B-E4