Copyright© 2001-2010, Alpha Communications®, All Rights Reserved.
AWD016
Rev. 5 (01/2010)
APPLICATION
The NH908A series intercom system allows any HT2006
series inside (master) handset station to selectively signal
(buzz) and communicate with any another HT2006 series
inside (master) or HT2003 inside (remote) handset sta-
tion. Communications is common-talk (non-private) type,
and allows for conference calls for up to four (4) total
handsets at a time. A number of optional accessories are
available to provide a complete intercom signaling and
communications system, with or without optional zone
paging.
PROCEDURE
1. Read installation instructions for each unit to deter-
mine equipment location and installation method.
2. Install equipment and wiring.
3. Check wiring and connect. Observe all local and
national electrical codes.
4. Apply power and check operation.
HOUSING INSTALLATION AND
EQUIPMENT LOCATION
INSIDE HANDSET STATIONS
Locate handsets where needed at convenient speaking
height, about 4.5 feet (137cm) from the finished floor.
Handset(s) 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.
NH908A AMPLIFIER/POWER SUPPLY
The NH908A is usually located in a separate equipment
location. You can mount the NH908A by peeling and
sticking using the self-stick mounting tabs or by screwing
it to the mounting surface using the holes provided. 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 devices or wiring or sources of electri-
cal interference.
TRANSFORMER
The SS106 pigtail type transformer may be installed on
NH908A Amplifier and Power Supply
Installation and Use Instructions
Used with the HT2006 Series
Inside Handset Intercom Stations
the fuse panel or other accessible source of 117 VAC,
preferably within 50' (15 meters) of the amplifier, but no
closer than 3 feet (1 meter) from the NH908A amplifier.
WIRING
INSIDE HANDSET STATIONS
Between HT2006 master handsets, run 4 conductor
(common) plus 1-conductor (selective) #22AWG cable
from handset to handset. Run a 4 conductor #22AWG
cable from any of the HT2006 master handsets to the
NH908A at the central equipment location. 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 de-
vices. 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
The NH908A amplifier is not designed to be used with
any door remote intercom stations. If this feature is
desired, you need to change the NH908A to the
NH208TVU amplifier and you must add R2006
AlphaTone™ chime modules into some or all of the
HT2006 handsets. You will also need to add the door
station(s) and door release(s) (if required).
Please see the NH208TVU wiring diagram (AWD057)
for complete wiring details for this type of system.
DOOR RELEASE
Same as above note concerning DOOR ENTRY STA-
TION.
CONNECTIONS
Before connecting, make certain wires are free from
shorts or grounds. Make connections as shown on fol-
lowing pages and as detailed in the following instructions.
