LiftMaster EL25 EL25 Installation Ver. 3.0 Manual - Page 15

Wiring to an Internal Phone System The units can be wired to any Analog Trunk in an internal home phone system. NOTE: Installation where fiber optic phone lines are present may require additional modifications from your telephone provider. Contact your provider for more information. Single Unit Telco Entrance Box Demarcation Point Ring Tip Internal Phone System Never run Telco wires and High Voltage wires in the same conduit. The high voltage wires may interfere with the Telco wires, possibly causing the system to malfunction. EX 1 EX 3Analog EX 4 2 Analog Trunk Tip T R Ring Use 18-24 AWG 2 twisted pair RES J6 Ring TELCO Tip J8 IO Output Board NO LED 4 J5 NC C RELAY 4 NO J4 NC LED 3 C RELAY 3 NO J3 NC C LED 2 NO RELAY 2 NC J1 C LED 1 RELAY 1 Wiring to an Internal Phone System Multiple Units (Up to 7) IMPORTANT: You must program the unit ID's for each unit wired in the series. See Keypad Programming Manual. To next unit (Unit ID 5 then 4 etc.) Unit ID 1 is farthest away from Telco Box. Use 18-24 AWG 2 twisted pair Ring RES Tip J6 Ring TELCO Tip J8 Unit ID 6 Output Board (See page 6) IO Output Board NO LED 4 J5 NC C RELAY 4 NO J4 NC LED 3 C RELAY 3 NO J3 NC C LED 2 NO RELAY 2 NC J1 C LED 1 RELAY 1 IO Output Board Ring Tip Telco Entrance Box Demarcation Point Internal Phone System EX 1 EX 3Analog EX 4 2 Tip T R Ring Analog Trunk Page 13 Ring RES Tip J6 Ring TELCO Tip J8 Unit ID 7 Output Board (See page 6) NO LED 4 J5 NC C RELAY 4 NO J4 NC LED 3 C RELAY 3 NO J3 NC C LED 2 NO RELAY 2 NC J1 C LED 1 RELAY 1