Electrical Connections; Electrical Service; Nameplate Ratings; Grounding - Data Aire LCS Installation, Operation And Maintenance Manual

3.0 ELECTRICAL CONNECTIONS

Before proceeding with the electrical connections, make certain that the volts,
hertz and phase correspond to that specifi ed on the unit electrical nameplate.
Use copper conductors only.
3.1

Electrical Service

Check to be sure the service provided by the utility is suffi cient to handle the additional load imposed
by this equipment. Units with outdoor secondary heat exchangers will require a separate power
source and fi eld-provided, interconnecting control wires as well. Indoor split units typically have a
single power source but can also be provided with separate sources. Field-provided, interconnecting
control wires are also required. See section 3.5 below.
Remote outdoor condensers and condensing units require one power source. Glycol systems
with fl uid coolers and loose pump(s) typically require one power source for the fl uid cooler and will
require one additional source for a single pump or two additional sources for dual pumps. Systems
where the pump(s) are mounted and piped integral to the fl uid cooler will usually require a single
power source.
3.2

Nameplate Ratings

Refer to the unit electrical nameplate for equipment electrical requirements. Minimum Circuit
Ampacity (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 adequate
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. Phase to phase imbalance must not exceed 3%. The local utility company should
be contacted for correction of improper line voltage. Deviation from ratings can cause premature
failures and possibly void unit warranty.
3.5

Auxiliary Control Wiring

For secondary heat exchangers (condensers and fl uid coolers) connect two 18 gauge wires from the
electrical box of the indoor evaporator to the electrical box of the remote heat exchanger. Refer to the
wiring diagrams located in the electrical box control panel of each unit. Follow the wiring diagrams
for each piece of equipment. On most remote heat exchangers the terminals will be #39 and #40.
All control wiring on Data Aire equipment is 24 VAC.
Condensing units (compressors mounted in condenser) typically require more wires. Refer to wiring
diagrams in the unit.
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.
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