Electrical Connections; Electrical Service; Nameplate Rating; Grounding - Data Aire DAMA-01 Installation, Operation And Maintenance Manual

3.0

ELECTRICAL CONNECTIONS

WARNING: Before proceeding with 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 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 (Auxiliary Control Wiring).
Remote outdoor condensers and condensing units require one power source. Glycol system with
fl uid coolers and loose pump(s) typically require one power source for the fl uid cooler and will re-
quire one additional source for a single pump or two additional sources for dual pumps. Systems
where the pumps 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 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 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. Phase to phase imbalance must not exceed 3%. The local utility company should be
contacted for correction if improper line voltage exists. 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 control panel of each unit. Follow the wiring diagrams
for each piece of equipment. On most remote heat exchangers the terminals will #30 and #40. All
control wiring on Data Aire equipment is 24 VAC.
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