Knoll VC220 Installation guide

Brand: Knoll

Model: VC220

Type: Installation guide

This manual is also suitable for

VC220PMI

VC220

Digital Volume Control

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 Knöll VC220 digital volume control attenuates stereo speaker signals

in 17 steps. On it’s top step it directly connects the speaker to the amplifier. The

VC220pm is also available which includes Powermatch circuitry allowing up to eight

VC220pms to be connected to a receiver with out a load matching interface.

The VC220 includes mute and start-up functions. The VC220 is controlled with a VC200

or VC201 keypad or an external controller such as the VCI-28 interface. Up to three

keypads can be connected (daisy chained) to a VC220. The VC200i and VC201i keypads

contain an internal infrared receiver (no extra wiring is necessary) to control the stereo

and other systems. The VC220 requires a 12VDC power supply, is usually wall-mounted

and works best if mounted vertically.

Basic System Layout and Pre-Wiring: See “Typical Wiring Diagram” on the back

page. When changing volumes the VC220 makes a noticeable “click” sound. We suggest

mounting it in a low voltage panel, electrical room, closet, etc. VC200’s and VC201’s

cannot control the same VC220. Only one VC200i or VC201i can be connected to a

single VC220pm.

Use the standard T568A wiring practices to run a cat 5 or cat 3 wire from the keypad or

controller to the VC220. If more than one keypad controls a single VC220, daisy chain

the wire from keypad to keypad. If the VC220(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 VC220(s) for the

power supply, the infrared system and future upgrades such as paging override. Like

conventional speaker volume controls the VC220 may require a stereo interface (such as

the Knöll WIN600) if multiple VC220s are connected to a single receiver.

From each VC220 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 VC220 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 VC220, 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.

If the VC220(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 VC220(s).

Connecting VC200/VC201 keypads to VC220 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 is to be connected to a VC220 controller, the wires to the

keypads are paralleled.

VC201i keypads are connected

to VC220 controllers, the same

as other keypads, the only

difference is extra VC220

wiring is required (see Infrared

connection diagram below).

Connection to Stereo Equipment: Remove the VC220 eight-position speaker

connector. The stereo amplifier or receiver outputs (left and right) are connected to the

VC220 connector labeled “TO AMP”. Be very careful to observe the correct polarity.

The VC220 uses independent floating grounds so bridged amplifiers can be used safely.

***The VC220pm is rated for use with maximum

120 watt per channel amplifiers. DO NOT use

higher-powered amplifiers with this product

for safety reasons.***

Depending on the receiver or amplifier rated impedance you may be able to connect more

than one VC220. For multiple connections of VC220’s an impedance matching interface

such as the WIN600 or SI1x6 may be required. Wire from the amplifier speaker terminals

are always wired in parallel to the VC220 controllers “TO AMP” terminals either by

stripping and soldering, using a speaker wire paralleling board, or daisy chaining from

one VC220 connector to the next VC220 connector etc. Connect all VC220’s to amplifier

speaker A or speaker B terminals, but not both. Wire the VC220 connectors labeled

“SPEAKER” directly to the correct speakers, again strictly observing polarity.

Power Requirements: The VC220

needs a 12vdc power supply. The

VC220 controller supplies power to the

keypads. A maximum of 60mA is

needed for each VC220. If possible,

connect the 12vdc power supply to the

switched outlet on the rear of the

amplifier or receiver. By doing this the

digital volume control resets to its

installer selectable “boot up” every

brown 8

white/brown 7

orange 6

white/blue 5

blue 4

white/orange 3

green 2

white/green 1

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

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

VC220 terminal labeled +12V and G (ground is the negative terminal). If more than one

VC220 is connected to a receiver, daisy chain the 12vdc power supply wires to the other

VC220 controllers.

Installer Selectable “BOOT UP”: The VC220 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 VC220 default is start muted when the 12VDC power is first turned on.

When the keypad button is pressed it starts in a quiet position #6 (of 17). To defeat the

start up mute, remove the right side shunt labeled “Start Muted” and the volume control

will boot up not muted.

To start the VC220 in (louder) position #12 with boot-up start mute or start mute

defeated, remove the left side shunt labeled “#12 #6”. To restore the boot up defaults,

replace the appropriate shunts.

Operation: The Knöll 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.

On VC200 keypads, the multicolor led indicators shows the volume control status. Red

is muted, green is on and amber is on at a high-level. At any time firmly press the center

of the switch to mute the volume. When the volume control has been set to mute, the

power indicator led will blink. To restore the volume press the rocker button up or down.

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 Knöll digital volume control has lost power, it defaults to

position #12. The VC200, VC201 and VC220 have no user replaceable parts.

Warranty

Knöll Systems warrants its products sold in the USA and Canada by authorized Knöll

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

Knöll Systems and found to be defective by Knöll Systems within the warranty period

will be repaired or replaced at Knöll Systems option, at no charge. Knöll 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.

Knoll Systems

145 Tyee Drive Point Roberts, WA 98281

11791 Machrina Way, #120 Richmond BC V7A 4V3

tel (604) 272 4555, fax (604) 272 5595

www.knollsystems.com

Made in Canada

L R

Digital Speaker

Volume Con trol

syst ems

VC200

Room 1 Room with stereo

VC220p m

2 conductor speaker wires

from amp t o VC200pm

2 conductor speaker wires

from VC2 00pm to speakers

Stereo

Speakers 4-16 oh m

8 conductor

cat 3 or cat 5

wire

12vdc power supply plugged

into stereo switched outlet

Typical

Wiring

Diagram

Note:

VC220p m can be

located in a remote

closet, electrical room etc.

Note:

Speaker wires from

amp to VC220pm and for

12Vdc are looped t o

multiple VC220pm’s

Start mute and

boot-up level

shunts

Knoll VC220 Installation guide

Brand: Knoll

Model: VC220

Type: Installation guide

This manual is also suitable for

VC220PMI

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Knoll VC220 Installation guide

This manual is also suitable for

Knoll VC220 Installation guide

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