Specifications

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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. Most units with secondary heat exchangers will require a separate
power source and fi eld-provided, interconnecting control wires. See section 3.5 below.
Remote condensers will typically 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. Follow
the wiring diagrams for each of these pieces of equipment. On most evaporators the terminals will
be #42 and #43. 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.
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.