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947019
SYSTEM DESIGN
General
Valcom Amplified Recessed Ceiling Speakers may be
used to provide one-way paging from any Valcom
one-way or talkback page control. The speakers can
also be used to expand existing 70V paging systems.
When power and appropriate input signal are applied,
a voice page can be made.
Page Control Access
(See Figure 1)
When using the Amplified Recessed Ceiling Speakers
with a Valcom page control, the following equipment
will be required:
•
Appropriate one-way speaker assembly
•
Valcom page control
•
Valcom power supply sized to provide power to
operate the amplified speaker assemblies and
page control
NOTE: When using the Valcom one-way interior
speakers with a Valcom handsfree page control, it
is recommended that a V-1092 Volume Control be
connected between the zone output and the
speaker input.
25V or 70V Paging Systems
(See Figure 2)
When using the Amplified Recessed Ceiling Speakers
with an existing 25 or 70V paging system, the
following equipment will be required:
•
Appropriate one-way speaker assembly
•
Valcom power supply sized to provide power to
operate the amplified speaker assemblies
•
25 or 70V line transformer tapped at 1/4 watt
with an 8 ohm output
•
Valcom V-1094A Page Port Preamp/Expander
Special Applications
The Tip and Ring input of the amplified speaker may
be connected directly to the speaker in most
electronic key telephones to amplify the level of the
speaker. A power supply is also required.
Speaker Cabling
All Valcom amplified one-way interior speakers
require 2 pairs to operate. Standard telephone station
cable may be used. Existing telephone wire and
feeder cables may also be used. Refer to the
following tables when planning an installation.
•
Audio Pair: The number of speakers looped on
the audio pair is not critical unless you have a
very large job. Table 1 gives guidelines for the
number of speakers per audio run.
Table 1 - Number of Speakers per Audio Run
Wire Run (Ft)
22 AWG
24 AWG
100
150
120
200
150
120
400
100
60
800
50
30
1600
25
15
•
Power Pair: The cable runs specified in Table 2
are very important and must be followed for
proper operation of the one-way paging speakers.
Table 2 - Number of Speakers per Power Run
(22 AWG)
Wire Run (Ft)
1 Watt Inside Speakers
100
60
200
30
400
15
800
7
1600
3
Coverage
The area covered by Valcom Recessed Ceiling
Speakers is determined by the height of the ceiling. If
the ceiling height is 8', the speaker will cover 250 sq.
ft. If the ceiling is 20 feet high, the speaker will
cover 1000 sq. ft.
INSTALLATION
Typical connections to a Valcom Page Adapter (refer
to Figure 1)
•
Connect screw terminal marked Tip to the tip
side of the desired speaker output of the page
control.
•
Connect screw terminal marked Ring to the ring
side of the desired speaker output of the page
control.
•
Connect -24VDC "B" battery (may be referred to
as "-" or "signal battery") from power supply to
screw terminal marked -24VDC on the speaker.
NOTE: "A" battery may be substituted for "B"
battery connections.
Connecting arrangement to 25 or 70V paging systems
(refer to Figure 2)
•
Connect transformer primary side terminal
marked COM to Black wire or 25 or 70V line.
•
Connect transformer primary side terminal
marked 1/4 watt to White wire of 25 or 70V line.
•
Connect transformer secondary side terminal
marked "C" to one screw terminal input of the
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