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DANGER
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LOCK OUT / DISCONNECT all power sources before starting, pressurizing, depressurizing or shutting down the chiller. Disconnect
electrical power before servicing equipment, including condenser fan motors or compressors. More than one disconnect may
be required to deenergize the unit. Failure to comply with this warning can result in serious injury or death. Be sure to read and
understand the installation, operating and service instructions in this manual.
Electrical Data
ELECTRICAL CONNECTION
CLIV units can be ordered with standard multi-point power connections or with optional single-point connections and various disconnect
and circuit breaker options. Wiring inside the unit is sized in accordance with the NEC®.
The required field wiring varies depending on the configuration of the unit.
Voltage limitations are:
1. Within 10 percent of nameplate rating.
2. Voltage unbalance must not exceed 2 percent. Since a voltage unbalance of 2 percent can cause a current unbalance of 6 to 10
times the voltage unbalance per NEMA MG-1, it is important that phase-to-phase unbalance be kept to a minimum.
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DANGER
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Qualified and licensed electricians must perform wiring. There is an electrical shock hazard that can cause serious injury or death.
Chiller electrical wiring connections may be made with copper wiring, provided the size and number of wires match the chiller terminals.
All wiring must be in accordance with applicable local and national codes, including NECA/AA 10402012 for installation of aluminum
wiring in buildings (ANSI).
1. The control transformer is supplied and no separate 115V power is required. For single and multipoint power connections, the control
transformer is on circuit #1 with control power wired from there to circuit #2. For multipoint power, disconnecting power from circuit
#1 disconnects the control power from the unit.
2. The size of the wiring supplied to the control panel shall be in accordance with the field wiring diagram.
3. The single point power supply requires a single disconnect to supply electrical power to the unit. This power supply must have a fuse
or use a circuit breaker.
4. All field wiring terminal range values listed in the unit selection report apply to 75°C cable per NEC.
5. It must be grounded per national and local electrical codes.
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CAUTION
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Static discharge during handling of the circuit boards can cause damage to the components. Use an antistatic strap before
performing any maintenance work. Never unplug cables, circuit board terminal blocks or plugs while the panel is powered.
Use with on-site generators
Switching from site mains to generator power and vice versa requires the chiller to be off or the power to be disconnected for more than
five seconds to avoid sending out-of-phase voltage to the chiller. A properly installed and fully synchronized automatic transfer switch
must be used to transfer power if the chiller is operating under load.
Generator sizing
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WARNING
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The generator should be sized by an electrical engineer familiar with generator applications.
Proper transfer of power from the standby generator to the grid is essential to prevent damage to the chiller and must be used to ensure
proper operation of the unit.
Transfer back to the grid