Copyright© 2001, Alpha Communications®, All Rights Reserved.
AWD068
Rev. 1 (09/01)
VM25WH Video Monitor
Station (shown with
HT2006/10 10-Button Handset)
APPLICATION
The VMH25 series video-intercom system allows a
number of VMH25 series inside monitors, with HT2006
series handset stations, to communicate with one or more
door entry stations with (or without) a built-in camera, and
with each other. When used as a door entry video-
intercom system, the VM25WH 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-
mine equipment location and installation method.
2. Install housings and wiring.
3. Install equipment.
4. Check wiring and connect. Observe all local
and national electrical codes.
5. Apply power and check system operation.
VM25WH Series (Residential Type)
Video-Intercom Installation and Use
Instructions, used with the NH208TVU
System Intercom Amplifier Unit
HOUSING INSTALLATION AND
EQUIPMENT LOCATION
INSIDE 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) location at the building entry location(s). NOTE:
For best picture (video) quality DO NOT POINT
CAMERA INTO DIRECT SUNLIGHT!!!
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
and NH208TVU amplifier, 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
VM25WH video monitor with HT2006 handset station(s).
WIRING
INSIDE HANDSET STATION(s)
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.
to the central equipment location (where the VRU and
NH208TVU units are found). Run a 6 conductor #22AWG
cable from any of the HT2006 master handsets to the
NH208TVU at the central equipment location. Run 2
conductor #18AWG from each video monitor directly to
the corresponding VRU power supply unit. Cables may be
straight or twisted pair type and may be solid or stranded
conductors. Run an RG59/U coaxial cable as required,
either in a looped fashion (from one monitor to the next) or
