Vertiv Liebert MCV330 - 6.4 Low Voltage Control Wiring-CANbus Communication

Unacceptable Power Supplies— 380-575V Nominal Units
• Wye with high-resistance (or impedance) ground
• Delta without ground or with floating ground
• Delta with corner ground
• Delta with grounded center tap
Service Kit Number for ROSENBERG EC FAN: 10027590P1S
Liebert® MCV330 units with Rosenberg EC Fans must use Service Kit number 10027590P1S.
No other EC Fan replacement kit part number allowed.
6.4 Low Voltage Control Wiring—CANbus Communication
NOTICE
Risk of control malfunction. Can cause improper unit operation.
Verify that all low voltage electrical wiring has been performed per the schematic diagram provided and that all
low voltage wiring connections are tight.
CANbus communication and interlock wiring are required between the indoor and the outdoor units. CANbus cables are
supplied by others to connect the indoor unit to the outdoor condenser. No special considerations are required when the total
external cable connection between the indoor unit and outdoor unit is less than 450ft.(137m). A CANbus isolator is required
for total external cable connections longer than 450ft.(137m) but less than 800ft.(243m).
The control wiring connections are described in the submittal documents included in the Submittal Drawings.
The following tables list the relevant documents by number and title.
Document Number Title
DPN003886 CANbus and Interlock Connections between Unit and Condenser
Table 6.4 CANbus Communication Connection Drawings
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Vertiv™ Liebert® MCV Installer/User Guide