Alpha Communications VMH25WH Series Operating and maintenance manual

Copyright©2001-2003,AlphaCommunications®,AllRightsReserved. AWD067 Rev. 2 (03/03)
VMH25WH Video
Monitor Station (shown)
APPLICATION
The VMH25 series video-intercom system allows a
number of VMH25 series inside monitor+handset sta-
tionstocommunicatewithoneormoredoorentrystations
with (or without) a built-in camera. When used as a door
entry video-intercom system, the VMH25WH can view
the caller, speak with the caller, and activate an electric
door release (if required).
PROCEDURE
1. Read installation instructions for each unit to deter-
mineequipmentlocationandinstallationmethod.
2. Installhousingsandwiring.
3. Installequipment.
4. Check wiring and connect. Observe all local
and national electrical codes.
5. Apply power and check system operation.
VMH25WH Series (Residential Type)
Video-Intercom Installation and Use
Instructions, used with the NH200A
SystemIntercomAmplifierUnit
HOUSING INSTALLATION AND
EQUIPMENT LOCATION
INSIDE MONITOR+HANDSET STATION(s)
Locate stations where needed at convenient speaking and
viewing height, about 4.5 feet (137 cm) from the finished
floor. Unit 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.
DOOR ENTRY STATION(s)
Locate door entry station(s) at a convenient speaking (and
viewing)locationatthebuildingentrylocation(s).NOTE:
For best picture (video) quality DO NOT POINT
CAMERAINTODIRECTSUNLIGHT!!!
SYSTEM TRANSFORMER(s)
The SS146 and SS106 system transformers should be
connected to accessible sources of 117 VAC, preferably
within 50' (15 meters) of the VRU system power supply
unit(s), but no closer than 3 feet (1 meter).
ELECTRIC DOOR OPENER (OPTIONAL)
The DO-001 (or equivalent 16VAC type) electric door
release is installed in the door jamb in place of the regular
door strike plate. It can be electrically operated by the
VMH25WH video monitor+handset station(s).
WIRING
INSIDE HANDSET STATIONS
Run 4 conductor #22AWG (common), RG59/U (com-
mon) and 1 conductor #22AWG (selective) cable from
video monitor+handset to video monitor+handset to the
centralequipmentlocation(wheretheVRU andNH200A
units are found). Run 2 conductor #18AWG from each
videomonitor+handsetdirectlytothecorrespondingVRU
power supply unit. Additional cables may be used to serve
other monitors on other risers (lines). Cables may be
straight or twisted pair type and may be solid or stranded
conductors. Depending upon additional system options
and/or functions you may need to run additional wires.
Please consult the factory for more information. RG59/U
coax cable must be good quality, ALL COPPER, with
minimum 95% copper braiding. As with all systems, we
recommend running some spare wires, for future use.
Route cable away from AC power wiring, transformers,

2
OPERATING INSTRUCTIONS
TO PLACE A CALL TO THE REMOTE
MONITOR+HANDSET UNITS:
At the remote door entrance station, depress button (for a
few seconds) for video monitor+handset you wish to call.
Thiswillsignalthebuzzer(oroptionalAlphatone™)signal
at the monitor handset, and will cause the video screen to
light and display the visitor. The resident may choose to
ignore the caller, or to lift the intercom handset to answer.
Resident may speak to the visitor by simultaneous 2-way
(DUPLEX) voice. If resident is satisfied with identity of
callerandwishestoletvisitorintothebuilding,residentshall
momentarily depress the door release (KEY) button on the
handset, which will electrically activate the door release
mechanism.Monitorwilltime-outautomaticallyafterapprox.
40 seconds (unless the time-out duration has been changed
by the installer/user). NOTE:in the lower right hand corner
of each monitor unit is a button marked 'ON'. Momentarily
depressing this button will cause the monitor to activate
again,andwilltimeoutafterthepre-programmeddelaytime.
Insystemswithmultipledoorentrystations,thesystemwill
automatically switch the voice, video and door release
functions to the last entry station that placed a call (when
used with the appropriate multiple entrance adaptors).
TROUBLESHOOTING
If the system fails to operate as required, review operating
instructions again. If the equipment fails to operate as
indicatedintheinstructions,checkthefollowingpoints:
1. ENTIRE SYSTEM DEAD: Check for 16VAC at the
two (2) transformer secondaries; wiring between trans-
formerandamplifier/powersupplyunit(s);connectionsat
main power supply units, 117VAC at transformer pri-
mary, and check the (3 amp slo-blo European size) fuse
in the VRU power supply. If fuse is blown, replace with
our model #50T-3A.
2. NO CALL UP BUZZER AT HANDSET: Check for
approx. 16VAC at terminals 'O' and 'S' on handset, when
entrystationpushbuttonisdepressed.Temporarilyswitch
handset with one from a functioning location. Check
wiring connections at remote handset. Check that wiring
insidehandsetbaseisnotrestrictingmovementofbuzzer
clapper; temporarily switch handset to another location
thatisfunctioning,andtryagain. Check that entry station
pushbutton is making contact, by shorting out the two (2)
wires on the back of the button.
3. NO PICTURE AT MONITOR: If screen is NOT
LIGHTING UP, check for approximately 16VDC at
(+) and (-) terminals on monitor PC board (VH250E or
fluorescent lights, light dimmers or other electrical devices.
Protectcablefromdamage.ShieldedcableshouldbeusedifAC
interference is a concern, or if cables cannot be run adequately
spaced away from any source of electrical interference.
DOORRELEASE
Run 2 conductor #18 from each door release location to the
central equipment location and NH208TVU amplifier unit.
Routeawayfromanystationwiring. Note:ifwire run is longer
than 50 feet (15m), use #16AWG cable.
CONNECTIONS
Before connecting, make certain wires are free from shorts or
grounds. Make connections as shown on the enclosed system
diagrams, and as indicated below.
NOTE: Please keep in mind that all wiring terminals
shown may not be in the actual order in which they
appear on the equipment. This is done for clarity of
wiring diagram purposes.
TRANSFORMER
1. Connect the SS146 and SS106 (16VAC) transformers to
the VRU power supply and NH200A amplifier unit(s),
respectively,whereindicated.Donot use transformer(s) to
power any other device(s).
2. Do not connect transformer primary to 117 VAC until
entire installation is complete and all wiring is checked.
DOORRELEASE
1. Connect 16 VAC electric door opener using 2 conductor
#18AWG (polarity not important). Route away from any
station wiring. Note: if wire run is longer than 50 feet
(15m), use #16AWG cable.
FINISH INSTALLATION
1. Install all components. Do not overtighten screws.
2. Connect primary of all transformers to 117 VAC.
Observe all local and national electrical codes.
TEST AND CHECKOUT
1. Atallremotemonitor+handsetstations,makecertainthe
handsets are completely hung-up on the handset cradle.
2. Check each monitor+handset unit in the system for
operation in accordance with the operating instructions.
3. Checkforproperdoor release function (on systems with
door release capability.
4. On systems with multiples entrances, check for proper
operation from each calling entrance station.
NOTE: System warranty is void if this system is installed
or used in any manner other than described in this
manual.

3
VH250P). Check Brightness and Contrast controls on
front of monitor. If screen IS LIGHTING UP but there
isnopicture,youprobablyarenotgettingavideosignal
from the camera to the monitor. Starting at camera,
check for video signal through coax cable, and through
(VDU-4)videodistributors(ifused).Checkforapprox.
12VDC power at each VDU-4 video distributor (if
used).Check coax connectorat camera(s) to makesure
itisnotshortedoropen.TemporarilyswitchmonitorPC
board(VH250E or VH250P)withone from afunction-
inglocation.
4. NO VOICE ON SYSTEM: Check volume control
potentiometer on NH200A amplifier. Check terminals
'T','O',and'M'tohandsets.Checkspeaker/microphone
connectionsateachentrystation. Disconnect terminals
'T','O'and'M'tosystemamplifier,andconnectasingle
handsettothoseterminals.Ifvoiceisworking,amplifier
and entry speaker/microphone are O.K., so check riser
wiring.Ifnotamplifierorspeaker/microphonecouldbe
faulty. Check by replacement.
5. UNABLE TO RELEASE DOOR STRIKE: Check
wiring to handset terminals '1' and 'O'. Temporarily
remove door opener wire from terminal '1' and touch to
terminal 'O'. Check operating voltage of door opener
matches output from system amplifier. Check wiring
(and gauge) to door opener, from amplifier/power sup-
ply.Whenusingamagnetictypelockorother'fail-safe'
typedoorlock,youshoulduseareversingrelay,suchas
our model# PK407A for each entrance.
6. HUM OR BUZZ: Check system wiring installed too
closetopowerwiringorelectricaldevicesortransform-
ers; check transformer(s) installed too close to control
equipment (should be at least three (3) feet away).
Wiringisbeingrunnexttowiringforothersystemsand/
or devices.
7. MONITORS TIMING OUT TOO QUICKLY:
Check adjusting control potentiometer on VH250E (or
VH250P) PC board and adjust as needed from approx.
0 to 180 seconds. Calibration is not exact, so please
check timing after re-adjusting.
8. MONITORS DO NOT TIME OUT AT ALL:
Check for shorts and/or grounds on system. Tempo-
rarilyswitchmonitorwithonefrom a functioning loca-
tion.Check that entrystationpushbutton is notstuckor
shorted.TemporarilyswitchmonitorPCboard(VH250E
or VH250P) with one from a functioning location.
PLEASE NOTE: If these checkpoints fail to indicate the
problem, there may be an equipment or wiring fault. Please
contact the factory or a qualified service representative
VMH25 COMPONENT LISTING
TYPICAL REPLACEMENT PARTS
Model# NH200A: Intercom amplifier unit. One (1) re-
quired for system for call, intercom and door release
functions. Requires SS106 transformer for power.
Model# VRU: Video Monitor Power Supply unit. One (1)
required for each four (4) (or less) monitors. Requires
SS146 transformer for power.
Model# VDU-4: Four (4) output Video Distributor. One
(1) required for each four (4) (or less) video outputs to
monitorrisers/lines.
Model# TU1007A: Multiple Entrance audio switching
adaptor. Used to switch the voice (and door release) to
the calling entrance. One (1) required for 2 entrances,
two(2)requiredfor3-4entrances,three(3)requiredfor
5-6 entrances, and four (4) required for 7-8 entrances.
Used on systems with more than one (1) entrance
station.
Model# DPS-2 (TUV2): Multiple Entrance video switch-
ingadaptor.Used(inadditiontotheTU1007A)toswitch
the video to the calling entrance. One (1) required for 2
entrances, two (2) required for 3-4 entrances, three (3)
required for 5-6 entrances, and four (4) required for 7-
8 entrances. Used on systems with more than one (1)
entrance station, where video switching is required.
Not
Used*
Not
Used*
Monitor
'ON'
Button
* These buttons and cap blanks are used on other systems
and do not apply to this configuration
ON

4
General Monitor Mounting and Wiring Information
Note: There are Black and Red pigtail wires coming from
terminals 'O' and 'LL' on the VH250E (or VH250P) P.C.
Board. The Black 'O' wire must jump to terminal 'O' on
the handset and the Red 'LL' wire must jump to terminal
'S' on the handset or the monitor will not activate when
the handset is signalled from the entrance station(s).
ON

5
TYPICAL WIRING DIAGRAM FOR SINGLE ENTRANCE SYSTEM
WITH S.T.R.™ STYLE CAMERA AND ONE (1) VIDEO RISER
(NO VIDEO DISTRIBUTORS) AND 1-4 MONITORS
Notes:
1. All wiring is #22AWG unless shown otherwise.
2. When using a PINHOLE type camera, instead of the standard S.T.R.™ type camera, see the special camera
installation and connection instructions found on page 8, and do not power as shown above.
3. DO NOT CONNECT MORE THAN 10 MONITORS PER VIDEO RISER/LINE.
4. Observe all local and national electrical and building codes.
5. All terminals connections shown may not be in the order that they appear on the equipment.

6
TYPICAL WIRING DIAGRAM FOR SINGLE ENTRANCE SYSTEM
WITH S.T.R.™ STYLE CAMERA AND MULTIPLE VIDEO RISERS
USING A SINGLE VDU-4 VIDEO DISTRIBUTOR UNIT
AND 1-4 MONITORS
Notes:
1. All wiring is #22AWG unless shown otherwise.
2. When using a PINHOLE type camera, instead of the standard S.T.R.™ type camera, see the special camera
installation and connection instructions found on page 8, and do not power as shown above.
3. DO NOT CONNECT MORE THAN 10 MONITORS PER VIDEO RISER/LINE.
4. Observe all local and national electrical and building codes.
5. All terminals connections shown may not be in the order that they appear on the equipment.
Note: For more
information on
the VDU-4, or
when connecting
multiple VDU-4
units together, for
more than 4 video
risers, see wiring
diagram#AWD061

7
Notes:
1. All wiring is #22AWG unless shown otherwise.
2. When using a PINHOLE type camera, instead of the standard S.T.R.™ type camera, see the special camera
installation and connection instructions found on page 8, and do not power as shown above.
3. DO NOT CONNECT MORE THAN 10 MONITORS PER VIDEO RISER/LINE.
4. Observe all local and national electrical and building codes.
5. All terminals connections shown may not be in the order that they appear on the equipment.
TYPICAL WIRING DIAGRAM FOR DUAL ENTRANCE SYSTEM
WITH S.T.R.™ STYLE CAMERA AND ONE (1) VIDEO RISER
(NO VIDEO DISTRIBUTORS) AND 1-4 MONITORS
Note: For systems with more
than two (2) entrances, or other
configurations, please consult the
factory or your nearest Alpha
Communications® distributor.

8
ALPHA COMMUNICATIONS® • 42 Central Drive • Farmingdale NY 11735-1202
TOLL-FREE TECHNICAL LINE 1-800-666-4800 • Phone: [phone] • Fax: [phone]
INTERNET WEBSITE: http://www.alpha-comm.com • EMAIL: [email protected]
THESE ARE LOW VOLTAGE DC POWERED CAMERAS AND THEY ARE POLARITY SENSITIVE.
THE POLARITY IS AUTOMATICALLY CORRECT WHEN THE POWER SUPPLY MODULE IS PLUGGED DI-
RECTLY INTO THE CAMERA USING THE FACTORY INSTALLED CONNECTORS. IF IT IS NECESSARY TO
EXTEND THE DISTANCE BETWEEN THE POWER MODULE AND THE CAMERA, CUT AND SPLICE THE
WIRE ON THE POWER MODULE ONLY. IF IT IS NECESSARY TO REMOVE THE POWER CONNECTOR OR
CUT AND EXTEND THE POWER CABLE, IT IS VERY IMPORTANT TO MAKE SURE THAT THE POLARITY
IS CORRECT BEFORE POWER IS SUPPLIED TO THE CAMERA. USE A METER TO CHECK THE POLAR-
ITY OF THE NEWLY SPLICED CABLE BEFORE CONNECTING IT TO THE CAMERA.
THE CENTER PIN MUST BE POSITIVE!
USE ONLY THE SUPPLIED POWER SUPPLY! POWER SUPPLY IS FOR INDOOR USE ONLY.
DO NOT REMOVE THE SERIAL NO. STICKER, AS THIS WILL VOID THE WARRANTY.
IF YOU ARE USING A PINHOLE STYLE CAMERA(s)
IN PLACE OF THE STANDARD S.T.R.™ STYLE CAMERA(s)
CONNECT THE CAMERA(s) AS SHOWN ON THIS DIAGRAM,
AND NOT AS SHOWN ON THE PROCEEDING PAGES.
THESE CAMERAS ARE TYPICALLY USED WITH THE
NATURAL ANODIZED ALUMINUM,
STAINLESS STEEL AND POLISHED BRASS PANELS.
THESE CAMERAS ARE POWERED BY THEIR OWN
PLUG-IN POWER SUPPLY, WHICH IS SUPPLIED
WITH EACH CAMERA.
POLARITY MUST BE OBSERVED!!
Mini (Pinhole) Camera
(front view)
Twist-On (BNC) Connector
for RG59/U Coaxial Cable
(use model CONN360 or
equivalent connector)
Plug-In Connector for
Model SS12P 12VDC
Power Supply (included)
IMPORTANT INFORMATION AND WARNING: