Alpha 931A-C17 Specsheet

Product Specification Sheet APS373 - Rev. 07/2013

931 System Amplifier/Power Supply931 System Amplifier/Power Supply

387 CANAL STREET • NEW YORK • NY • 10013-1615 • Phone: [phone] • Fax: [phone] CANAL STREET • NEW YORK • NY • 10013-1615 • Phone: [phone] • Fax: [phone]

Web: www.canalalarm.comWeb: www.canalalarm.com

Copyright © 1998-2 017 Alpha Communication s® - All Righ ts Reserved.

Elvox is a registered trademark of Paso Sound Product s Inc.

Due to c ontinuo us product i mprovement, all col ors, sizes, materials, finishes and sp ecifications are subject to change witho ut not ice.

FeaturesFeatures

Easily Installs Right on Finished Wall Surfac e or in
Customer Supplied Housing
Only one power supply required per system.
Clear Voice Fidelity with Adjustable Voice Volume Control
Convenient Positive Screw Terminal Connections
Operates on standard 120VAC primary power

Architects' And Engineers' SpecificationsArchitects' And Engineers' Specifications

The power supply/amplifier shall be Alpha Communications® /
Elvox™ model 931, or approved equal. Amplifier shall operate from
a standard 120VAC power source. All other wiring t o power
supply/amplifier shall be low-voltage Class II wiring, installed as per
all federal, stat e, and local electrical c odes. Power supply/amplifier
shall surfac e mount right to the finished wall and shall be
installed in a suitable environment that is free from exc essive
dirt, dust, temperature, humidity, grease and water.
Power supply/amplifier shall provide the intercom amplificat ion and
signaling power for proper system operation. For most sec ure
installation, power supply should be installed into a lockable
equipment cabinet / housing. The 931 is designed to be used with
the 870W, 8870 and 902 series apartment handset intercom unit s
(or equivalent).

Power supply/amplifier shall be installed a safe distance from any
source of elec trical interference.

Contractor shall observe all local and national electrical and
building codes.

931 Amplifier/Power Supply931 Amplifier/Power Supply

The Alpha Communications® 931 amplifier/power supplies are used
with the 870W, 8870 and 902 series handset intercom stat ions (or
equivalent), to provide intercom amplification, power to operate
the electric door opener(s) et c., and power to signal the handsets
from the lobby entrance stat ion.

The 931 unit s each require a standard 120VAC power source.

These 931 amplifier/power supplies are designed to easily surface
mount right onto the finished wall by means of c ustomer supplied
screws. Connections are positive screw terminal type.

Only one (1) 931 is required for eac h syst em, regardless of
the number of handsets in the building.

SpecificationsSpecifications

Dimensions:

Height: 2.55" (65mm)
Width: 5.50" (140mm)
Depth: 4.55" (116mm) from mounting surface

Volume Control: Adjustable potentiomet er built-in.

Connections: Positive Sc rew T erminal Connectors.

Wiring RequirementsWiring Requirements

Basic intercom riser wiring shall be 4-c ommon #22AWG, 2­common and 1 select ive wire #22AWG, for eac h handset station
on the riser. Add one (or more) additional c ommon wires if other
handset functions will be used. See system wiring diagram(s) for
more c omplete wiring information.

Optional ComponentsOptional Components

DO-001A 16VAC Door Release-Mortise Type

839/302

Dual Entrance Dual Video Adaptor
(requires 2/690 connec tor cable)

PK407A

Specialty Door Opener Relay Adaptor
(1 per entrance)