Z:\Quick Documentation\Intercoms\Aiphone\LEF\LEF 5 & 10 Intercom Connections.doc – last updated 02/26/03 rsl
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PTI Integrated Systems
LEF-5 & Lef-10 Intercom Connections
Technical Support Form
8271 East Gelding Drive Scottsdale, AZ
85260
Phone: 480-941-1513 Fax: 480-346-
LEF-5 & LEF-10 Intercom Connections (Page 5)
Option II – Dual LEF Intercom Base Station
This installation allows there to be two LEF Intercom Base Stations (one in the office and another in a guard station or
apartment) and two or more remote intercoms. Please note, the LEF-5 and LEF-10 look very similar, differing only in the
number of screw terminals on the terminal block.
1. Run a single 18awg, 10 conductor, shielded cable from the Main LEF Intercom Base Station to the Secondary LEF
Intercom Base station. Run an additional set of cable with three conductors from the Secondary LEF to each remote
intercom (APEX, Keypad with Intercom or CodeXpress with Intercom). This can be an additional length of 18awg, 10
conductor, shielded cable splitting three conductors out to each remote intercom or multiple 18awg, 3 conductor,
shielded cables, each run to a separate remote intercom. Strip back the outside insulation and inner foil layer of the
cable approximately 2” from each end, being careful not to damage the bare shield wire or the insulation around either
conductor. Spade connectors and wire nuts/crimp connectors are required for each remote and LEF Intercom Base
Station. Spade connectors, wire nuts, and/or 3M crimp connectors must be provided by the installer. The maximum
length per Aiphone is 1600’ with 18 awg wire.
2. At each Keypad with Intercom or CodeXpress with Intercom, connect the Intercom + to the Red Intercom + wire
coming from the intercom button in the Keypad or CodeXpress. Cut the soldered end off of the Black/Green wires to
separate them into two wires. Connect the Intercom – wire to the Black wire coming from the speaker in the Keypad or
CodeXpress. Connect the common wire (E) to the Green wire coming from the intercom button in the Keypad or
CodeXpress. Use a wire nut or 3M UY2 connector for to make these splices. Wrap the splice connection with
electrical tape to seal it. See Correct Splicing Techniques document.
3. At each APEX Series Access Device with LEF Intercom, connect Intercom +, Intercom –, and common (E) wires to the
tan intercom terminal block. This terminal block is located in the Upper left hand corner of the circuit board, next to the
speaker, directly below the black terminal block containing all of the speaker and intercom button wire connections.
Strip the Intercom +, Intercom –, and common (E) wires back ¼”. Insert the Intercom + wire in the top (1) position on
the tan terminal block and tighten down the screw connection. Insert the common (E) wire in the center (E) position on
the tan terminal block and tighten down the screw connection. Insert the Intercom – in the bottom (–) position on the
tan terminal block and tighten down the screw connection. On the APEX circuit board, slightly above the tan terminal
block and to the right of the black terminal block is a jumper. Verify that the jumper is set to “All Others”.
4. At the Secondary LEF Intercom Base Station, remove the Shorting jumper link from the (–) and (E) terminals.
Connect the Intercom – from all of the remotes to the (–) terminal on the terminal strip using spade connectors.
Connect the common (E) wire from each remote to the (E) terminal on the terminal strip using spade connectors.
Connect the Intercom + wire from the first remote to the (1) terminal on the terminal strip using a spade connector.
Connect the Intercom + wire from the second remote to the (2) terminal on the terminal strip using a spade connector.
Do not wrap wires around the terminal screws.
5. Connect the Main LEF Intercom Base Station to the Secondary LEF Intercom Base Station using the 10 conductor wire.
Connect 1 conductor from (1) on the Main LEF to the (1) on the Secondary LEF. Connect another conductor from (2)
on the Main LEF to the (2) on the Secondary LEF. Connect another conductor from (3) on the Main LEF to the (C) on
the Secondary LEF. Connect another conductor from (C) on the Main LEF to the (3) on the Secondary LEF. Connect
another conductor from (E) on the Main LEF to the (E) on the Secondary LEF. Connect another conductor from (R) on
the Main LEF to the (R) on the Secondary LEF. Connect another conductor from (Y) on the Main LEF to the (Y) on
the Secondary LEF. Connect another conductor from (+) on the Main LEF to the (+) on the Secondary LEF. Connect
another conductor from (–) on the Main LEF to the (–) on the Secondary LEF. Use Spade connectors; do not wrap
wires around the terminal screws.
