Alpha NH200A User Manual

NH200A Amplifier and Power Supply

Installation and Use Instructions Used

with the HT3003/2 and/or HT2003/2 Series

Inside Handset Intercom Stations

APPLICATION

The NH200A series intercom system allows one or more
HT3003 and/or HT2003 series inside handset stations to
communicate with one or more door entry stations, and to
release the door opener at each 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
electrical 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(S)
Locate door station(s) at convenient speaking height on
exterior wall near entrance. Door stations must have 16­ohm speaker and MK1C type electret condenser micro­phone installed.

NH200A AMPLIFIER/POWER SUPPLY
The NH200A is usually located in a separate equipment
location. You can mount the NH200A 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 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 NH200A 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
NH200A, 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
Run 4 conductor (common) and 1-conductor (selective)
#22AWG cable from station to station and to 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 NH200A amplifier. If the NH200A amplifier is
not mounted behind the entry door station, and is mounted
remotely, we recommend using shielded cable from the
speaker/microphone wires to the NH200A 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.

Copyright© 1995-2004, Alpha Communications®, All Rights Reserved.

AWD013 Rev. 4 (04/2004)

DOOR RELEASE
Run 2 conductor #18AWG from the electric door release
location to the NH200A 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.

INSIDE HANDSET STATIONS

1. Connect terminals 'O' and 'M' on handset stations to
terminals 'O' and 'M' on other handset stations and to
terminals 'O' and 'M' on the amplifier.

2. Connect terminal '1' on handset stations to terminal '1' and
other handset stations to one side of the electric door
opener.

3. Connect terminal 'T' on handset stations to terminal 'T'
and other handset stations to terminal 'U' on the entry
door station microphone assembly.

4. Connect terminal 'S' on each individual handset station to
the corresponding push-button at the entry door station,
that is used to signal that handset station.

5. Terminal 'Z' on each handset station is an optional
terminal, and is only used if the 'Red Dot' push-button
needs to be used to operate an optional function.

DOOR ENTRY STATION (for single entrance systems)

1. Connect speaker/microphone terminals 'L' and 'B' on
door entry station to terminals 'L' and 'B' on the NH200A
amplifier.

2. Connect speaker/microphone terminal 'U' on door entry
station to terminal 'T' on the inside handset station(s).

TRANSFORMER

1. Connect transformer 16VAC terminals to the 16VAC
input terminals on the NH200A amplifier/power supply.
Do not use this transformer to power any other device,
not included on this system.

2. Do not plug SS146 transformer into electrical outlet or
connect SS106 transformer primary to 117 VAC until
entire installation is complete and checked.

FINISH INSTALLATION

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
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.

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® warranty is void if this
system is installed or used in any manner other than de­scribed in this manual.

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 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.

DOOR OPENER

1. Connect one wire coming from door opener to amplifier
terminal '8V~'.

2. Connect the other wire coming from the door opener to
terminal '1' on the inside handset station(s).

NOTE: POLARITY OF AC TYPE DOOR OPENER
TERMINALS IS NOT CRITICAL.

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 NH200A
amplifier; connections at amplifier terminals and for 117
VAC at transformer primary.

2

2. NO CALL UP BUZZER AT HANDSET: Check for

approx. 16VAC at terminals 'O' and 'S' on 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.

3. NO VOICE ON SYSTEM: Check volume control (poten-

tiometer) on NH200A amplifier (in both directions; up and
down). Check terminals 'T', 'O', and 'M' to handsets.
Check speaker/microphone connections at each entry
door station. Disconnect terminals 'T', 'O' and 'M' on
NH200A system amplifier, and connect a single handset to
those terminals. If voice is working, amplifier and entry
speaker/microphone are O.K., so check riser wiring. If
not, amplifier or speaker/microphone could be faulty.
Check by replacement.

4. UNABLE TO RELEASE DOOR STRIKE: Check wiring

to handset terminals '1' and 'O'. Temporarily remove door
opener wire going to handset terminals '1' and touch to
terminal 'O' on NH200A. Check operating voltage of door
opener matches output from system amplifier. Check
wiring (and gauge) to door opener, from amplifier/power
supply. When using a magnetic type lock or other 'fail­safe' type door lock, you should use a reversing relay,
such as our model# PK407A for each entrance.

INSTALLING THE R2007 AlphaTone™: When you
wish to replace the standard AC buzzer in the HT2003/2
series handsets with the optional model R2007 AlphaTone™
unit, please follow these instructions:

1. Locate the silver AC buzzer in the lower right hand corner of
the handset base. Remove the set screw (and keep it for re­use).

2. Gently pull up the two (2) wires from the buzzer that are
attached to the internal p.c. board. Carefully slide the wires off
of the connecting posts.

3. Install the R2007 AlphaTone™ in place of the buzzer, using the
buzzer set-screw.

4. Install the two (2) wires onto the p.c. board, using the same
connecting posts that the buzzer used. Polarity does not
matter.

5. Position the wires inside the handset base, so they will not get
'pinched' when the cover is placed over the base.

6. Using a small screwdriver, you can change the AlphaTone's
sound, by adjusting the built-in potentiometer found on the
p.c. board of the R2007.

7. The buzzer on the HT3003 may also be replaced with the R2007
AlphaTone™, by following the same instructions as above.

5. HUM OR BUZZ: Check system wiring installed too close

to power wiring or electrical devices or transformers;
check transformer(s) installed too close to control equip­ment (should be at least three (3) feet away). Wiring is
being run next to wiring for other systems and/or devices.

6. SQUEALING OR HOWLING: Check amplifier volume

control set too high; check for loose speaker/microphone
at door entry station(s).

7. UNABLE TO TALK TO DOOR STATION: Check

terminal 'M' going from handsets to NH200A amplifier for
continuity and shorts, grounds, etc. Check for proper
functioning of door entry station speaker. Check for
approx. 16 ohms between terminal 'L' and 'B' on speaker
microphone (with system wiring disconnected).

8. UNABLE TO LISTEN TO DOOR STATION: Check

terminal 'T' going from handsets to terminal 'U' on door
entry station for continuity and shorts, grounds, etc.
Check for proper functioning of door entry station micro­phone.

If these checkpoints fail to indicate the problem, there may be
an equipment fault. Contact the factory or qualified service
representative.

3

TYPICAL WIRING LAYOUT DIAGRAM

FOR A SINGLE ENTRANCE SYSTEM

Notes:

1. Use #18AWG wiring to transformer and door opener. All other wiring can be #22AWG.

2. Talk down volume can be adjusted using volume control (potentiometer) on NH200A amplifier/power supply.

3. When connecting to a magnetic door lock or other 'fail safe' type door lock, use the optional model PK407A
specialty relay, for each entrance door lock.

4. If the NH200A amplifier is not mounted behind the entry door station, and is mounted remotely, we recommend
using shielded cable from the speaker/microphone wires to the NH200A amplifier/power supply.

5. Observe all local and national electrical codes.

6. All terminals connections shown may not be in the order that they appear on the equipment.

ALPHA COMMUNICATIONS® • 42 Central Drive • Farmingdale NY 11735-1202

TOLL-FREE TECHNICAL LINE 1-800-666-4800 • Phone: [phone] • Fax: [phone]

WEBSITE: www.AlphaCommunications.com • EMAIL: [e-mail]

4