Controlled Products Systems Group 1812-090 - Manual (Page 15)

1812-162-G-12-10 13
1.4 Power Wiring
The 1812 Access Plus operates ONLY on 16.5 VAC. DO NOT power the 1812 with 24 volt AC power. Use the supplied power
transformer, 16 VAC, 20 VA (or U.L. listed equivalent) to power the telephone entry system. DO NOT power any other devices
(electric strikes, magnetic locks, etc.) from the 1812’s power transformer. See table below for wire run distances.
Power Interruption Note: The Time
and Date calendar chip (Section 2,
2.7.1) in the 1812 Access Plus will
keep time for approximately 48 hours
if power to the system is lost or
removed. If power is off longer than
this, the Time and Date will need to
be reprogrammed into the system.
All other specific programming that
has been done will remain intact after
power has been restored.
DoorKing offers a 12 volt .8 amp
hour gel cell battery that can
connect to the main terminals 9 and
10 to provide back-up power during
power interruptions.
(DoorKing P/N 1801-008)
Wire Size Max Distance
18 AWG
16 AWG
100 ft
200 ft
Power Transformer Wire Run Table
1.5 Grounding and Surge Suppression
Power Transformer Wires
(Not supplied)
Supplied Transformer
Polarity does
not matter.
Output
16.5 V
AC
20 V
A
CAUTION
DO NOT power the 1812 from a 24-Volt
source (Such as a gate operator).
Damage will occur to the 1812 that is
NOT covered under DoorKing’s warranty.
Proper Grounding and the use of surge suppressors can significantly reduce the chance of component failure because of static
charges or surges. To be effective, ground connections should be made with a minimum 12 AWG wire to a ground point within
10 feet of the device being protected. The ground point can be at an electrical panel, a metallic cold water pipe that runs in the
earth or a grounding rod driven at least 10 feet into the soil. A gooseneck mounting post anchored in concrete does NOT make
a good ground.
Telephone Line Surge Suppressor
It is highly recommended that telephone line surge
suppressor (DoorKing P/N 1877-010) be installed
to help protect the system from phone line power
surges.
Surge suppressor must be positioned 3 ft
or less from the ground source, 12 AWG min.
Low Voltage Surge Suppressor
It is highly recommended that a low voltage surge
suppressor (DoorKing P/N 1878-010) be installed to
help protect the telephone entry system from power
surges.
Surge suppressor must be positioned 3 ft or
less from the ground source, 12 AWG min.
Some Acceptable Ground Sources
Ground to metallic cold water pipe.
Ground
Wire
Ground
Wire
Phone Company
Transformer
1812
Surge Suppressor within
3 ft of ground source.
Surge Suppressor within
3 ft of ground source.
Ground to existing electrical system.
Electrical
Panel
Grounding rod 10 feet in soil.
PHONE LINE 1877-010
77 8 9
4 5 6
0
1812
POWER LINE 1878-010
7 8 9
4 5 6
0
IMPORTANT: Ground wire shown without
safety protection for clarity. Make sure
ground wire is protected from being
touched or electrical shock could occur!