Backup Battery; Power Wiring - NuTone AD-500 Directives D'installation

100920 AD500 Install instruct
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Power Wiring

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NOTE: DO NOT APPLY POWER UNTIL THE INSTALLATION IS
COMPLETE. TURN MASTER POWER SWITCH OFF BEFORE
WIRING.
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1. Route two wires between the AD-500 and the power transformer.
• For power wire runs up to 100 feet, use 18 AWG, THHN 600-volt
insulated wire.
• For power wire runs up to 200 feet, use 16 AWG, THHN 600-volt
insulated wire.
2. Connect the wires to the transformer. Connect the other end of the
wires to the AD-500 AC1 & AC2 terminals.

Backup Battery

Use of battery backup is optional. It will allow the AD-500 to operate for
short periods of time without AC power. The door or gate access device
must use some type of battery backup of its own for the entire system to
be functional.
!
NOTE: The AD-500 does not supply battery charging current. An
External battery charger will be required to maintain the battery.
A backup battery will not fit into the AD-500 case. Protect the backup
battery inside a rain-tight NEMA enclosed suitable for the installation.
!
NOTE: A backup battery is not required to maintain the AD-500
programming memory during power outages.
1. Route two wires between the AD-500 and the backup battery.
2. Connect the battery positive to the DC+ terminal.
2. Connect the battery negative to the DC- terminal.
Earth Ground
For the best ground use size 12 gauge solid wire or larger to connect
the AD-500 to an 8-foot copper ground rod. Locate the ground rod next
to the Power and Telephone company rods and bond the rods together
with a new clamp. Do not disturb the clamps installed by the Power or
Telephone Company. Alternately, connect to a cold water pipe for the
earth ground.
1. Connect the wire from the earth ground to the AD-500's CASE
GROUND STUD.
!
NOTE: The EARTH GROUND terminal is internally connected
to the circuit board ground, which is connected by a green ground
wire to the EARTH GROUND STUD.
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