Electrical Connections; Electrical Service; Nameplate Ratings; Grounding - Data Aire DARC 03 Installation, Operation & Maintenance Manual

3.0

ELECTRICAL CONNECTIONS

WARNING: The Data Aire cooling unit must be connected by a licensed and qualified
electrician. Risk of electrical shock could result in injury or death. Disconnect all remote
electrical power supplies prior to working on the unit.
NOTE: Disconnect switches are optional. The disconnect switch when turned OFF will
de-energize the high voltage.
WARNING: Before proceeding with the electrical connections, make certain that the
volts, hertz and phase correspond to that specified on the unit electrical nameplate.
Use copper conductors only.
3.1

Electrical Service

Check to be sure the service provided by the utility is sufficient to handle the additional load imposed
by this equipment. Units with secondary heat exchangers will require a separate power source and
field-provided, interconnecting control wires.
3.2

Nameplate Ratings

Refer to the unit electrical nameplate for equipment electrical requirements. Minimum circuit am-
pacity (MCA) also known as wire sizing amps, will dictate the minimum required wire gauge.
Maximum overcurrent protection (MOP) device amps will dictate the maximum circuit breaker or
fuse size.
3.3

Grounding

The unit cabinet must have an uninterrupted true earth ground. An electrical ground wire of ad-
equate size must be connected to the ground lug provided inside the main electrical box.
3.4

Voltage Tolerance

The supply voltage to the unit must be within tolerance; -5% to +10% for 208-230 voltage, +10% for
460 volts as indicated on the unit electrical nameplate. Phase to phase imbalance must not exceed
3%. The local utility company should be contacted for improper line voltage. Deviation from voltage
ratings can cause premature failures and possibly void unit warranties.
WARNING: Check the wiring connections in the unit control panel to ensure they are
tight. Screw terminals may become loose in transit. Tightening of wiring connections
is the responsibility of the installing contractor.
14 Air Cooled Condenser User Manual
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