Alpha NH208TVU User Manual
NH208TVU Amplifier and Power Supply
Installation and Use Instructions
Used with the HT2006 Series
Inside Handset Intercom Stations
and 1 or more Door Stations
APPLICATION
The NH208TVU 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 station. Communications is common-talk (non-private) type, and allows for
conference calls for up to four (4) total handsets at a time. In
addition, any master handset may communicate with one or
more door speakers, and optionally release the electric door
opener(s). 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 determine
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.
OUTSIDE STATION(S)
Locate door station(s) at convenient speaking height on exterior wall near entrance. Door stations must have 16-ohm speaker
and MK1C type electret condenser microphone installed.
NH208TVU AMPLIFIER/POWER SUPPLY
The NH208TVU is usually located in a separate equipment
location. You can mount the NH208TVU by using the provided
'Din Rail' mounting bracket. 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
electrical interference.
TRANSFORMER
The SS106 pigtail type transformer may be installed on 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 NH208TVU amplifier.
DUAL ENTRY ADAPTOR (TU1007A)
For multi-entrance installations you must use one or more
model TU1007A multi-entrance adaptors. When these adaptors are used, they should be installed next to the NH208TVU,
in the central equipment location. They do not require any
additional transformers.
The DO-001A (or equivalent 16VAC type) electric door release
is installed in the door jamb in place of the regular door strike
plate.
WIRING
INSIDE HANDSET STATIONS
Between HT2006 master handsets, run 5 conductor #22AWG
(common) plus 1-conductor (selective) #22AWG cable from
handset to handset (equal to no. of total handsets on system).
Add 1 additional #22AWG common wire for any of the following options; 1 wire for each call button at the door station; 1 wire
for each button to be used for electric door release; 1 wire for
each paging zone; etc. Run a 5 conductor #22AWG cable from
any of the HT2006 master handsets to the NH208TVU 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 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
Run 3 conductor #22AWG cable from speaker/microphone to
the NH208TVU amplifier. We recommend using shielded cable
from the speaker/microphone wires to the NH208TVU amplifier/power supply. Run the #22AWG pushbutton wiring as
well. Route cable away from inside station cable, AC power
wiring, transformers, fluorescent lights, light dimmers and
other electrical devices. Protect cable from damage. Shielded
cable should be used if AC interference is a concern.
DOOR RELEASE
Run 2 conductor #18AWG from the electric door release
location to the NH208TVU amplifier. If distance is greater than
Copyright© 2001-2003, Alpha Communications®, All Rights Reserved.
AWD057 Rev. 4 (09/03)
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 following pages and as
detailed in the following instructions.
INSIDE MASTER HANDSET STATIONS
1. Connect terminals 'T', 'O', 'M' and 'S' on HT2006 handset stations
to terminals 'T', 'O', 'M' and 'S' on other HT2006 handset stations
and to terminals 'T', 'O', 'M' and 'S' on the NH208TVU amplifier.
2. Connect terminals 'E' on HT2006 handset stations to terminals
'E' on other HT2006 handset stations and to terminal '8V' on the
NH208TVU amplifier.
3. Terminals 1 thru 5 (on HT2006/5) and 1-10 on (HT2006/10)
handsets are the calling-out 'selective' terminals to call other
master handsets (or electric door release).
4. Terminal 'Z' is the calling-in 'selective' terminal on each master
handset that identifies the handset number (#) being called from
the other handsets.
5. Connect terminal 'R' on each individual handset to the corresponding push-button at the entry door station, that is used to
signal that handset station (thru the R2006 AlphaTone™).
DOOR ENTRY STATION (for single entrance systems)
1. Connect speaker/microphone terminals 'L', 'B' and 'U' on door
entry station to terminals 'L', 'B' and 'U' on the NH208TVU
amplifier.
TRANSFORMER
1. Connect transformer 16VAC terminals to the 16VAC input
terminals on the NH208TVU amplifier/power supply. Do not
use this transformer to power any other device, not included on
this system.
2. Do not plug SS146 (plug-in) transformer into electrical outlet or
connect SS106 transformer primary to 117 VAC until entire
installation is complete and checked.
FINISH INSTALLATION
NOTE: The Alpha Communications
system is installed or used in any manner other than described in
this manual.
®
warranty is void if this
OPERATING INSTRUCTIONS
OUTSIDE DOOR STATION
TO CALL HANDSET: Push button on outside door station to
signal inside handset(s). The AlphaTone™ electronic chime will be
heard at the inside handset station(s) connected to that push
button.
INSIDE HANDSET STATIONS
TO REPLY: Lift the inside handset off of its cradle and speak in
a normal voice. Conversation is full duplex type (simultaneous talk
and listen). If satisfied with the identity of the caller, you may
depress the 'Door Release' push-button (1-5 or 1-10) to electrically
open the entrance door (if so equipped). An AC type door opener
will 'buzz' while operating, indicating permission to enter. When
conversation is completed, hang-up handset on its cradle.
CALLING ANOTHER HANDSET STATION
Lift the calling handset off of its cradle and depress the button
corresponding to the handset you wish to call, for a few seconds.
The electric buzzer inside the handset being called will sound as
long as the button is depressed. Wait for the other party to lift his/
her handset to reply. Speak in a normal voice. Conversation is full
duplex type (simultaneous talk and listen). When conversation is
completed, hang-up both handsets on their cradles.
Special Note About CALLING HANDSET TO HANDSET:
It is important to lift the calling handset off of its cradle, BEFORE
depressing the push button to call the other handset station. If you
depress the push button first, and then lift the calling handset
cradle, the door station(s) will not be disconnected and the inside
conversation may be heard at the door station(s). This is due to the
fact that when the handsets are hung-up, the relay that disconnects
the door station is dis-engaged and re-enables conversation at the
door station(s).
1. Install stations on housings. Do not overtighten screws.
2. Install amplifier and accessory devices as needed.
3. Plug SS146 transformer into outlet. If SS106 transformer is used,
connect primary to 117 VAC. Observe all local and national
electrical codes.
TEST AND CHECKOUT
1. At all inside handset stations, make sure the handsets are hungup and seated properly on the cradle switch, and that no wires
were 'pinched' when handset covers were affixed.
2. Check each unit in the system for operation in accordance with
the operating instructions.
3. If feedback occurs between stations, check wiring and check for
any loose speaker and/or microphone connections inside the
handset(s). Also, try reducing volume to door speaker(s).
Amplifier volume control is preset at the factory, but may be
readjusted, if necessary.
TROUBLESHOOTING
If the system fails to operate as required, review operating instructions again. If the equipment fails to operate as indicated in the
instructions, check the following points:
1. ENTIRE SYSTEM DEAD: Check 16VAC at transformer
secondary; wiring between transformer and NH208TVU amplifier; connections at amplifier terminals and for 117 VAC at
transformer primary.
2. NO CALL BUZZER AT HANDSET: Check for approx.
16VAC at terminals 'Z' and 'S' (on HT2006 handset) when called
from another handset. Temporarily switch handset with one
from a functioning location. Check wiring connections at
handsets. Check that wiring inside handset base is not restricting movement of buzzer clapper; temporarily switch handset
to another location that is functioning, and try again. Check
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