Alpha Communications® Amplifiers/Power Supplies/Accessories

Amplifiers/Power Supplies/Accessories

The NH200A is used with the HT2003/2 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® NH200A amplifier/power supplies are used with the S.T.R.™ HT2003 series 5-wire apartment handset stations to provide intercom amplification and power to operate the electric door opener(s) etc. The NH200A 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. The NH200A amplifier/power supply is a compact P.C. board type, with self-stick mounting tabs and mounting holes for surface wall or other types of mounting. Connections are positive screw terminal type, using a barrier type terminal connector strip.

NH200A

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 Barrier Type Screw Terminal Connections

SPECIFICATIONS

Dimensions:
        		Height:    3.50" (89mm)
        		 Width:    3.50" (89mm)
        		 Depth:    0.75" (20mm) from mounting surface

Volume Control: 	Adjustable potentiometer built-in.
		
Connections:		Barrier Type Screw Terminal Connectors.
	
ARCHITECTS' AND ENGINEERS' SPECIFICATIONS
The power supply/amplifier shall be Alpha Communications®  
model NH200A, 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.
R1           	Pulsating Buzzer Adaptor. Used when you have individual apartment door pushbuttons
		that need to signal (buzz) the apartment handsets. Converts steady buzzer to
		pulsating buzzer.
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 4-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.
AWD013 for more complete wiring information.