Copyright© 2001-2003, Alpha Communications®, All Rights Reserved.
AWD067
Rev. 2 (03/03)
VMH25WH Video
Monitor Station (shown)
APPLICATION
The VMH25 series video-intercom system allows a
number of VMH25 series inside handset sta-
tions to communicate with one or more door entry stations
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-
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.
VMH25WH Series (Residential Type)
Video-Intercom Installation and Use
Instructions, used with the NH200A
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
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 handset station(s).
WIRING
INSIDE HANDSET STATIONS
Run 4 conductor #22AWG (common), RG59/U (com-
mon) and 1 conductor #22AWG (selective) cable from
video handset to video handset to the
central equipment location (where the VRU and NH200A
units are found). Run 2 conductor #18AWG from each
video handset directly to the corresponding VRU
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,
