Alpha Communications NH209TT Series Installation And Use Instructions

APPLICATION
The NH209TT series intercom system allows one or more
HT3009 and/or HT2009 series inside handset stations to
communicate with a maximum of one door entry station,
and to release the door opener at the door entry station. A
number of optional accessories are available to provide a
complete entry intercom signaling and communications
system.
PROCEDURE
1. Read installation instructions for each unit to determine
equipment location and installation method.
2. Install housings and wiring.
3. Install equipment.
4. Check wiring and connect. Observe all local and
national electrical and building codes.
5. Apply power and check operation.
HOUSING INSTALLATION AND
EQUIPMENT LOCATION
INSIDE HANDSET STATIONS
Locate stations where needed at convenient speaking height,
about 4.5 feet (137cm) from the finished floor. Handset
can be secured directly to the finished wall surface or can
be mounted over a single gang electrical 'gem' box or single
gang electrical plaster ring.
OUTSIDE STATION
Locate door station at convenient speaking height on
exterior wall near entrance.
NH209TT AMPLIFIER/POWER SUPPLY
The NH209TT amplifier mounts directly behind the speaker/
microphone at the door entry station. It must be located
away from any source of direct heat or extreme cold and
in an accessible location. Keep at least 3 feet (1 meter) away
from transformers, light dimmers or other electrical de-
vices or wiring or sources of electrical interference.
TRANSFORMER
The T1240 plug-in type transformer may be plugged into a
standard 117VAC outlet, preferably within 50' (15 meters)
of the amplifier, but no closer than 3 feet (1 meter) from the
NH209TT amplifier.
Copyright© 1995-2006, Alpha Communications®, All Rights Reserved.
NH209TT Amplifier and Power Supply
Installation and Use Instructions Used
with the HT3009 and/or HT2009 Series
Inside Handset Intercom Stations
MULTI ENTRY ADAPTOR
The NH209TT system can only be used with one (1) door
entry station, and cannot be used for multiple door applica-
tions. Therefore, there is no multi entry adaptor available.
The DO-001 (or equivalent 12VAC type) electric door
release is installed in the door jamb in place of the regular
door strike plate.
WIRING
INSIDE HANDSET STATIONS
Run 1 conductor (common) and 1-conductor (selective)
#22AWG cable from station to station and to the NH209TT
amplifier. Additional cables may be used to serve other
stations on other risers (lines). Cables may be straight or
twisted pair type and may be solid or stranded conductors.
Route cable away from AC power wiring, transformers,
fluorescent lights, light dimmers or other electrical devices.
Protect cable from damage. Shielded cable should be used
if AC interference is a concern, or if cables cannot be run
adequately spaced away from any source of electrical
interference.
DOOR ENTRY STATION (using NH209TT)
The NH209TT amplifier/power supply is designed to be
mounted behind the speaker/microphone grille on the door
entry station. Run 2 conductor #18AWG from the 12VAC
transformer to the NH209TT amplifier/power supply. If
distance is greater than 50 feet, use #16AWG cable. Cable
should be run separately from any intercom or #22AWG
wiring. Transformer cable should be a separate jacketed
cable. Protect cable from damage.
DOOR RELEASE
Run 2 conductor #18AWG from the electric door release
location to the NH209TT amplifier. If distance is greater
than 50 feet, use #16AWG cable. Use a separate cable from
the intercom cable, and route away from any intercom
wiring.
CONNECTIONS
Before connecting, make certain wires are free from shorts
or grounds. Make connections as shown on page 4 and as
detailed in the following instructions.
AWD019
Rev. 5 (08/2006)