Electrical Information - LG AR-DR12-05A Installation And Operation Manual

ELECTRICAL INFORMATION

WARNING
The roof lining contains high voltage wiring. To prevent electrocution, do not puncture the interior or exterior panels of the roof.
To prevent injury or death due to electrocution or contact with moving parts, lock disconnect switch open.
For units with a gas furnace, if you turn off the power supply, turn off the gas.
The equipment must be properly grounded and bonded. Any wiring running through the unit in the airstream must be protected by metal conduit,
metal clad cable or raceways.
High voltage electrical input is needed for this equipment. This work should be performed by a qualified electrician.
Any wiring deviations may result in personal injury or property damage. Manufacturer is not responsible for any damage to, or failure of the unit
caused by incorrect final wiring.
Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached on
the inside of the control center door(s).
All wiring should be done in accordance with the latest edition of the National Electric Code ANSI/NFPA 70 and any local codes that may apply. In
Canada, wiring should be done in accordance with the Canadian Electrical Code.
If replacement wire is required, it must have a temperature rating of at least 105ºC, except for an energy cut-off or sensor lead wire which must be
rated to 150ºC.
Determine the Size of the Main Power Lines
The unit's nameplate states the voltage and the unit's MCA. The main power lines to the unit should be sized accordingly. The nameplate is
located on the outside of the unit on the control panel side.
Determine the Size of Electric Heater Wiring
An optional electric heater may require a separate power supply. The power connection should be made to the factory-provided electric heat-
er disconnect and must be compatible with the ratings on the nameplate, supply power voltage, phase and amperage. Consult ANSI/NFPA 70
and CSA C22.1 for proper conductor sizing.
Provide the Opening(s) for the Electrical Connections
Electrical openings vary by unit size and arrangement and are field-supplied.
Connect the Power Supplies
Connect the main power lines and electric heater power lines to the disconnect switches or terminal blocks and main grounding lug(s).
Torque field connections to manufacturer's recommendations.
Wire the Optional Convenience Outlet
The field wired convenience outlet requires a separate 120 Volt power supply circuit. If convenience outlet is ordered as factory wired,
separate field wiring is not required. The circuit must include short circuit protection which may need to be supplied by others.
Connect Field-Wired Low Voltage Components
Most factory-supplied electrical components are prewired. To determine what electrical accessories require additional field-wiring, refer to
the unit-specific wiring diagram located on the inside of the control center access door. The low voltage control circuit is 24 VAC and control
wiring should not exceed 0.75 ohms. Control wires should not be run inside the same conduit as that carrying the supply power. Make sure
that field-supplied conduit does not interfere with access panel operation. All low voltage wiring should be run in conduit wherever it may be
exposed to the weather. If wire resistance exceeds 0.75 ohms, an industrial- style, plug-in relay should be added to the unit control center
and wired in place of the remote switch (typically between terminal blocks R and G on the terminal strip. The relay must be rated for at least
5 amps and have a 24 VAC coil. Failure to comply with these guidelines cause motor starters to "chatter" or not pull in which can cause
contactor failures and/or motor failures.
Field-Provided Disconnect
If field-installing an additional disconnect switch, it is recommended that there is at least four feet of service room between the switch and
system access panels. When providing or replacing fuses in a fusible disconnect, use dual element time delay fuses and size according to
the rating plate.
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Due to our policy of continuous product innovation, some specifications may change without notification.
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