Alpha Communications® Amplifiers/Power Supplies/Accessories

Amplifiers/Power Supplies/Accessories

The NH201TVA is used with the HT2001 series S.T.R. handsets, primarily for use in apartment house intercoms, but can be used for small home and office intercoms.

The Alpha Communications®/S.T.R.™ NH201TVA amplifier/power supplies are used with the S.T.R.™ HT2001 series 3-wire apartment handset stations to provide intercom amplification and power to operate the electric door opener(s) etc. The NH201TVA operates on 16VAC (30VA) low-voltage Class II wiring. For permanent transformer mounting use our Model #SS106 (U.L. Listed) transformer. For plug-in transformer connection use our Model #SS146 (U.L. Listed) transformer. These NH201TVA amplifier/power supplies are designed to easily surface mount right onto the finished wall by means of customer supplied screws or the convenient plastic 'Din Rail' bracket supplied with each power supply. Connections are positive screw terminal type. An optional model NH201TT is also available, which is a p.c. board type unit, with built-in speaker and microphone, to be installed right onto the the back of the speaker grille on the standard S.T.R.™ type lobby panels. The NH201TT also requires the #SS106 (or SS146) 16VAC transformer for power.

NH201TVA

FEATURES

• Easily Installs Right on Finished Wall Surface or in Customer Supplied Housing
• Operates on Safe Low-Voltage Class II Wiring
• Clear Voice Fidelity with Adjustable Voice Volume Control
• Convenient Screw Terminal Connections

SPECIFICATIONS

Dimensions:
	      	Height:    2.375" (60mm)
         	Width:    4.25"  (108mm)
         	Depth:    4.75"  (120mm) from mounting surface


Volume Control:  Adjustable potentiometer built-in.
		
Connections:	Screw Terminal Connectors.
    
 ARCHITECTS' AND ENGINEERS' SPECIFICATIONS
The power supply/amplifier shall be Alpha Communications®/S.T.R.™  model NH201TVA, or
approved equal. Amplifier shall operate from a 16VAC (30VA) U.L. Listed transformer (SS106 or
SS146). All wiring to power supply/amplifier shall be low-voltage Class II wiring, installed as per
all federal, state, and local electrical codes. Power supply/amplifier shall surface mount right to
the finished wall and shall be installed in a suitable environment that is free from excessive dirt,
dust, temperature, humidity, grease and water. Power supply/amplifier shall provide the intercom
amplification and signaling power for proper system operation. For most secure installation,
power supply should be installed into a lockable equipment cabinet/housing. Power supply/
amplifier shall be installed a safe distance from any source of electrical interference.


     
OPTIONAL COMPONENTS
DO-001    	(or equivalent) 16VAC Door Release.
TU1007A  	Multi Entrance Audio Adaptor. Used when switching audio (intercom) and door release
		between two (2) or more entrance stations. Used in addition to system amplifier. Use
		one (1) for (2) entrances, use two (2) for (3-4) entrances, use three (3) for (5-6)
		entrances and use four (4) for (7-8) entrances. No additional transformer needed.
PK407A   	Specialty Relay Adaptor. Used when connecting a door opener other than a 16VAC
		type to system. One (1) required for each building entry door opener.


	 
	
WIRING REQUIREMENTS:
Apartment riser wiring shall be 2-common #22AWG and 1 selective wire #22AWG, for each
handset station connected to the riser cable. Add 1-#22AWG common wire if there are optional
apartment pushbuttons which will also have to signal apartment handset, when visitor is at
apartment door (and when using optional R1 pulsating buzzer adaptor). See wiring diagram no.
AWD011 for more complete wiring information.