Electrical Connections; Electrical Service; Nameplate Ratings; Grounding - DA Data Cool Series Installation, Operation And Maintanance Manual

3.0 ELECTRICAL CONNECTIONS

Before proceeding with the electrical connections, make certain that the volts, hertz
and phase correspond to that specified on the unit electrical nameplate.
damaged from incorrect power input will not be covered under warranty. 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. Indoor unit has a single power source. 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. Units with outdoor secondary heat exchangers will require a separate power
source and field-provided, interconnecting control wires as well. See section 3.5 below.
Remote outdoor condensing units require one power source. Glycol systems with fluid coolers and
loose pump(s) typically require one power source for the fluid 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 fluid 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,
also known as Wire Sizing Amps, will dictate the minimum required wire gauge. Maximum Overcurrent
Protection 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 of -5% +10% for 208-230 voltage,+/- 10% for 460
voltage. The local utility company should be contacted for correction of improper line voltage. Deviation
from voltage ratings can cause premature failures and possibly void unit warranties
Check the wiring connections in the unit control panel to ensure they are tight. Screw terminals may
come loose in transit. Tightening of wiring connections is the responsibility of the installing contractor.
3.5

Auxiliary Control Wiring

The outdoor condensing unit requires its own power source and ground source. A disconnect (field
provided) is required to be installed to isolate the unit for maintenance and service. Check
nameplate voltage ratings to ensure field power (building power).
A field supplied 3 or 4 wire control connection (24 VAC) is required between the evaporator and the
condensing unit. All control wiring must be installed in accordance with the National Electrical Code
(NEC) Class 1 circuit. See the unit schematic for control wiring details
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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Units