Alpha NH209TT-3 User Manual
NH209TT-3 Amplifier and Power Supply
Installation and Use Instructions Used
with the HT3009 and/or HT2009 Series
Inside Handset Intercom Stations
APPLICATION
The NH209TT-3 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-3 AMPLIFIER/POWER SUPPLY
The NH209TT-3 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 devices or wiring or sources of electrical interference.
MULTI ENTRY ADAPTOR
The NH209TT-3 system can only be used with one (1)
door entry station, and cannot be used for multiple door
applications. 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 NH209TT3 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-3)
The NH209TT-3 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-3 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-3 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.
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-3 amplifier.
Copyright© 2012, Alpha Communications®, All Rights Reserved.
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.
AWD168 Rev. 1 (10/2012)
INSIDE HANDSET STATIONS
1. Connect terminal 'I' on handset stations to terminal 'I' on
other handset stations and to terminal '6' on the NH209TT3 amplifier/power supply.
2. Connect terminal 'II' on each individual handset station to
the DZ209 Diode Board(s) located in the door entry
station, corresponding to the push-button at the entry door
station, that is used to signal that handset station.
3. Terminals 'Z' and 'K' on each handset station are optional
terminals, and are only used if the 'Red Dot' push-button
needs to be used to operate an optional function.
3. If feedback occurs between stations, reduce volume.
Amplifier volume control is preset at the factory, but
may be readjusted, if necessary.
NOTE: The Alpha Communications®/factory warranty is void if this system is installed or used in any
manner other than described in this manual.
OPERATING INSTRUCTIONS
DOOR ENTRY STATION
1. The door entry speaker (formerly called terminals '11'
and '12' on the older NH209TT amplifier) are factory
installed onto connector pins on the NH209TT-3.
2. The microphone (formerly called terminals 'B' and 'U' to
terminals '9' and '10' on the older NH209TT amplifier) are
factory installed onto connector pins on the NH209TT-3.
TRANSFORMER
1. Connect transformer 12VAC terminals to the 12VAC
input terminals ('1' and '2') on the NH209TT-3 amplifier/
power supply. Do not use this transformer to power any
other device, not included on this system.
2. Do not plug the T1240 (plug-in type) transformer into
electrical outlet or connect to 117 VAC until entire
installation is complete and checked.
DOOR OPENER
1. Connect wires coming from the 12VAC door opener to
amplifier terminals '3' and '4'.
NOTE: use proper gauge wiring to door opener.
NOTE: POLARITY OF AC TYPE DOOR OPENER
TERMINALS IS NOT CRITICAL.
DZ209 DIODE BOARD(s)
1. Connect wires coming from terminal '8' on all diode
boards together and then to terminal '8' on the NH209TT3 amplifier.
FINISH INSTALLATION
1. Install stations on housings. Do not overtighten screws.
2. Install amplifier and accessory devices as needed.
3. Plug T1240 transformer into 117 VAC outlet. Observe all
local and national electrical and building codes.
TEST AND CHECKOUT
1. At all inside handset stations, make sure the handsets are
hung-up 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.
OUTSIDE DOOR STATION
TO CALL HANDSET: Push button on outside door
station to signal inside handset. An electric buzzer will be
heard at the inside handset station. If the electric buzzer has
been replaced by the optional model R2007 AlphaTone™
unit, an electronic chime warble sound will be heard at the
handset station.
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 'Key Symbol' push-button 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, hangup handset on its cradle.
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 12VAC at transformer
secondary; wiring between transformer and NH209TT-3
amplifier; connections at amplifier terminals and for 117
VAC at transformer primary.
2. NO CALL UP BUZZER AT HANDSET: Check for
approx. 12VDC across the two (2) wire leads on the AC
buzzer (or R2007) inside handset, when entry station
pushbutton is depressed. Temporarily switch handset
with one from a functioning location. Check wiring
connections at remote handset. 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 that entry station
pushbutton is making contact, by shorting out the two (2)
wires on the back of the button. Check to make sure the
DZ209 diode board(s) behind the door entry station are
connected properly. The 'HT' side of the DZ209 should
connect to the selective 'II' terminals from the remote
handsets. The 'T' side of the DZ209 should connect to the
2
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