Controlled-products-systems-group 1812-087 User Manual download pdf (Page 9)

SECTION 1 - INSTALLATION

• Installation of the telephone intercom system involves the installation and wiring of the Entry

System By-pass Switch and the installation and wiring of the 1812 unit itself.

• Do not use thinly insulated brown-jacketed telephone wire (the type found in the walls of a

house) for any phone line wiring. These wires must be of the proper gauge and must be rated

for direct underground burial. A clear, noise free system is directly related to the quality of the

telephone wire used. Do not run telephone lines and high voltage lines in the same conduit.

Separate high voltage and telephone line conduits by at least six (6) inches. Be sure that all

phone wires are twisted.

TELEPHONE LINE WIRING

WIRE SIZE MAX DISTANCE IN FEET

24 AWG 800

22 AWG 1600

20 AWG 2200

18 AWG 3600

• It is highly recommended that telephone line surge suppressers (DoorKing p/n 1877-010) be

installed on both the phone in and phone out lines to help protect the system from power

surges.

• Use the supplied power transformer, 24 VAC, 20 VA (or U.L. listed equivalent) to power the

telephone intercom system. Do not power any other devices (electric strikes, magnetic locks,

etc.) from this power transformer. For wire runs up to 100 feet, use 18 AWG wire. For wire

runs up to 200 feet, use 16 AWG wire. Power runs are susceptible to noise and hum

pick-up, therefore it is preferable that you keep power runs as short as possible.

POWER WIRING

WIRE SIZE MAX DISTANCE IN FEET

18 AWG 100

16 AWG 200

• It is highly recommended that a low voltage surge suppresser (DoorKing p/n 1878-010) be

installed to help protect the telephone entry system from power surges.

• Proper grounding and the use of surge suppressers 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

telephone intercom system. The ground point must 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.

1812-065-M-3-07 Page 9

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Controlled-products-systems-group 1812-087 User Manual Page 9