Knoll VC220PMI User manual

VC220pmi
Warranty Digital Volume Control
Knoll Systems warrants its products sold in the USA and Canada by
authorized Knoll dealers to be free of defects in materials and
workmanship. This warranty extends for two full years from the date
of purchase by the original consumer. Any products returned to Knoll
Systems and found to be defective by Knoll Systems within the
warranty period will be repaired or replaced at Knoll Systems option,
at no charge. Knoll Systems will not be responsible for the actual cost
of installation or removal of the product, nor for any incidental or
consequential damages. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above
limitation may not apply to you. This warranty gives you specific legal
rights. You may have additional legal rights that vary from state to
state.
Installation Instructions
Warning: To be installed and/or used in accordance with appropriate
electrical codes and regulations.
Caution: Do not install these keypads in an electrical junction box
with 110V or higher unless an approved barrier separates the high and
low voltage sections.
Description: The Knoll VC220pmi digital volume control attenuates stereo
speaker signals in 17 steps. It contains Powermatchcircuitry allowing
connection of up to eight VC220pmi’s to a receiver. A non Powermatch
version, model VC220 is available. The VC220pmi includes mute and start-up
functions. The VC220pmi is controlled with a VC201, a RB8 remote control
(requires a VC201i keypad). Up to three VC201 (not VC201i) keypads can be
connected (daisy chained) to a VC220pmi. The VC201i keypad contains an
internal infrared receiver (no extra wiring is necessary) to control the stereo
and other systems. The VC220pmi requires a 12VDC power supply, is usually
wall-mounted and works best if mounted vertically.
The VC201 and VC220pmi have no user replaceable parts.
L R
Digital Speaker
Volume Control
syste ms
VC201i
Room 1 Room with ster eo
VC220pmi
2 conductor speaker w ires
fro m amp to VC220pmi
2 condu ct o r spe ak er wir es
from VC220pmi to speakers
Stereo or
Receiver
Speakers 4-16 ohm
8 conductor
cat 3 or cat 5 wire
12vdc power supply plugged
into stereo switched outlet
No te :
Speaker an d power
supply wires can be loo ped
from VC220pmi to VC220pmi
Basic System Layout and Pre-Wiring: See “Typical Wiring Diagram” on
the back page. The VC220pmi makes a noticeable “click” sound when changing
volumes. We suggest mounting it in a low voltage panel, electrical room, closet,
etc. From one to eight VC220pmi’s can be connected to a single amp or
receiver (that has 4 ohm capability). Only one VC201i can be connected to a
single VC220pmi.
Use the standard T568A wiring practices to run a cat 5 or cat 3 wire from the
keypad or controller to the VC220pmi. If more than one keypad controls a
single VC220pmi daisy chain the wire from keypad to keypad. If the
VC220pmi(s) are not located next to the stereo, run a single eight-conductor
cat 3 or cat 5 wire run from the stereo to the VC220pmi(s) for the power
supply, the infrared system and future upgrades such as paging override.
From each VC220pmi run a fire rated two-conductor speaker wire to each
speaker. To save time and money, most installers run a four-conductor speaker
wire from the VC220pmi to the closest appropriate speaker and then run a
short two-conductor speaker wire to the other speaker. If there is more than
one pair of speakers connected to a single VC220pmi, the speakers can be
wired in series or parallel whichever makes the impedance closest to 4 or 8
ohms. Do not attempt to make the final combined speaker impedance less
than 4 ohms.
Knoll Systems
145 Tyee Drive Point Roberts, WA 98281 If the VC220pmi(s) are not located next to the stereo, run a single fire rated
four-conductor (or two two-conductor) 14-18 gauge speaker wire from the
stereo to the VC220pmi(s).
12140 Horseshoe Way Richmond, BC V7A 4V5
tel [phone], fax [phone]
www.knollsystems.com
Made in Canada
VC220pmi 1999-2007 Knoll Systems All Rights Reserved

Connecting VC201/VC201i keypads to VC220pmi controllers:
Use a single cat5 wire using all eight conductors (usually run inside a wall).
Always use standard T568A Cat 5 wiring practices (shown below). Use the
correct wire pairs. Polarity is VERY important! The stereo signal is not routed to
the keypad, just the digital control signals. Signals from an infrared receiver (if
used) are routed down the same Cat 5 wire. If more than one keypad (VC201,
not VC201i) is to be connected to a VC220pmi controller, the wires to the
keypads are paralleled.
VC201i keypads are
connected to VC220pmi
controllers, the same as
other keypads, the only
difference is extra power
supply and IR emitter
wiring are required (see
Infrared connection
diagram below).
Connection to Stereo Equipment: Remove the VC220pmi eight-position
speaker connector. The stereo amplifier or receiver outputs (left and right) are
connected to the VC220pmi connector labeled “TO AMP”. Be very careful to
observe the correct polarity. The VC220pmi uses independent floating grounds
so bridged amplifiers can be used safely.
*** The VC220pmi is rated for use with maximum
120 watt per channel amplifiers. DO NOT use higher-
powered amplifiers with this product for safety
reasons.***
Up to eight VC220pmi controllers can be connected to a single amplifier or
receiver if it rated for 4-ohm use. If the amplifier or receiver is rated for 8-ohm
use, up to three VC220pmi controllers can be connected. Wire from the
amplifier speaker terminals are always wired in parallel to the VC220pmi
controllers “TO AMP” terminals either by stripping and soldering, using a
speaker wire paralleling board (our model WT6), or daisy chaining from one
VC220pmi connector to the next VC220pmi connector etc. Connect all
VC220pmi’s to amplifier speaker A or speaker B terminals, but not both. Wire
the VC220pmi connectors labeled “SPEAKER” directly to the correct speakers,
again strictly observing polarity.
Power Requirements: The
VC220pmi needs a 12vdc power
supply. The VC220pmi controller also
supplies power to the keypads. A
maximum of 60mA is needed for each
VC220pmi. If possible, connect the
12vdc power supply to the switched
outlet on the rear of the amplifier or
receiver. This wiring causes the VC220pmi to reset to its selectable “boot up”
every time the receiver or amplifier is turned on. The plug on the end of the
12vdc power supply needs to be cut off and discarded. The wire is stripped off
and connected to the VC220pmi terminal labeled +12V and G (ground is the
negative terminal). To connect more than one VC220pmi to a receiver, daisy
chain the 12vdc power supply wires to the other VC220pmi controllers.
If one 12vdc power supply powers both the VC220pmi and the VC201i
infrared receiver, wire the unswitched 12VDC supply to the “POWER” +12V and
G terminals on the VC220pmi, then run a jumper wire from the “POWER” +12V
to the “INFRARED” 12V terminals.
Installer Selectable “BOOT UP”: The VC220pmi allows the installer to
select how the volume control “boots up” when it first receives 12vdc power. If
this feature is required, be sure to plug the 12vdc power supply to the switched
AC outlet on the rear of the receiver or amplifier. The VC220pmi default is start
muted when the 12VDC power is first turned on.
•To always start muted and in the lowest volume step (off) make sure the right
side shunt on the VC220pmi controller labeled "start muted" is in place.
•To always start up in a quiet position #6 (of 17). Remove the right shunt
labeled "start muted" and make sure the left shunt labeled "#12 #6" is in
place.
•To always start up in a louder position #12 (of 17). Remove the right shunt
labeled "start muted" and remove the left shunt labeled "#12 #6".
•To restore the boot up defaults, replace the appropriate shunts.
Operation: The Knoll digital volume control is very easy to use. It has a total
of 17 different volume settings. Volume settings only affect the room that they
are in. After the stereo is turned on, you may or may not have sound
depending on how the system was set up during installation.
To increase the volume (in this room only), push the rocker button up. Hold the
button up continuously and the volume will increase until maximum. To lower
the volume, push the rocker button down. Hold the button down continuously
and the volume will decrease until it mutes.
At any time firmly press the center of the switch to mute the volume. To
restore the volume press the rocker button up or down.
The RB8 remote control source buttons do not work on the VC201/VC220pmi as
it has no source selection capabilities.
If infrared emitters where installed other (source) remote controls aimed at the
VC201i keypads will control the source components.
On VC201 keypads the lower led indicates that power to the system has been
switched on. The six side leds show the relative volume. When in mute (center
of rocker has been pushed) one of the side leds blinks. To restore the volume
press the rocker button up or down.
Note: If the stereo is on and the Knoll digital volume control has lost power, it
defaults to position #12.
Stereo
12VDC power supply plugged
into stereo switched outlet
POWER INFRARED
+12V G 12V SIG
Infrared
emitter(s)
12VDC power supply
plugged into power
full time
+
-+
-
VC220/VC220pm
brown 8
white/brown 7
orange 6
white/blue 5
blue 4
white/orange 3
green 2
white/green 1