E27.REV

DIMMING SYSTEMS

NOTE: FINAL DATE: JUNE, 1988.

NOTE: THIS SECTION IS FOR CENTRAL DIMMING SYSTEMS ONLY. REFER TO SECTION E12 "DEVICES" FOR WALL BOX DIMMERS

NOTE: DUE TO THE SPECIFIC NATURE OF DIMMING SYSTEMS, ADDITIONAL INFORMATION REGARDING THE FUNCTIONAL REQUIREMENTS OF EACH SYSTEM MUST BE ADDED TO THIS SPECIFICATION. EXAMPLES HAVE BEEN INCLUDED FOR FORMAT PURPOSES ONLY

Part 1 -	GENERAL

1)	DESCRIPTION

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for lighting control systems for the following areas

NOTE: LIST AREAS WHERE EACH SEPARATE DIMMING SYSTEM OCCURS. ADD OR DELETE AS NECESSARY

NOTE: WHEN SPECIFYING FLUORESCENT DIMMING SYSTEMS, COORDINATE ACCEPTABLE DIMMING BALLAST MANUFACTURER WITH DIMMING SYSTEM MANUFACTURER

1.	Auditorium, Multi-purpose room and Restaurant.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION No. 1 and Section GENERAL PROVISIONS FOR ELECTRICAL WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECION

B.	Related work in the following Sections:

1.	WIRE AND CABLE.

2.	LOW VOLTAGE DISTRIBUTION EQUIPMENT.

3.	POWER, CONTROL AND ALARM WIRING SYSTEMS.

4.	GROUNDING SYSTEM.

5.	LIGHTING FIXTURES.

6.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for Guarantee and other Quality Assurance requirements

5)	SUBMITTALS

A.	Submit shop drawings for all assemblies and their interconnection

B.	Submit product data.

C.	Submit samples of equipment.

D.	Submit operating instructions and parts list.

6)	OPERATION

NOTE: PROVIDE A DETAILED DESCRIPTION OF THE OPERATION OF EACH DIMMING SYSTEM PREVIOUSLY LISTED

A.	Auditorium

1.	Normal operation.

NOTE: EXAMPLE ONLY - CHANGE DESCRIPTION TO SUIT EACH DESIGN.

a.	Provide four control zones as scheduled on drawings and four scene preset system

b.	Adjustable preset potentiometers shall be located at the master control station

c.	All zones shall be capable of being controlled at all normal conrol stations and all stations shall have active control capabilities at all times

d.	Dimmer fade rate shall be adjustable at the master control station

e.	Interface preset scenes with audio-visual panel shall be as directed

f.	Refer to Article 2.08 for description of individual control station functions

2.	Emergency operation.

a.	Coil shall be sensed before dimmers detects failure of normal power feed

EMER

b.	Coil shall activate electronic relay, by-passing normal control functions. Emergency dimmers shall be driven full-on via emergency power feed

c.	Coil shall activate transfer switch connected to emergency lighting circuits at load side of dimmers. Emergency lighting circuits shall be energized via transfer to emergency power feed, by-passing dimmers

EMER

RESET

d.	Upon resumption of normal power, system shall return to pre-established conditions

e.	Upon resumption of normal power, all dimmers shall be driven to full-on

RESET

3.	Panic operation.

a.	Panic stations shall activate electronic relay, by-passing normal condition control functions

PANIC

b.	All dimmers shall be driven to full-on status.

c.	Dimmers for channels ----- shall be driven to full-on status

PANIC

d.	"Normal" button shall return system to previously established conditions

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Electro-Controls, Strand Century, Lutron and Kliegl.

2)	ASSEMBLIES AND SUB-ASSEMBLIES

A.	All assemblies and sub-assemblies for each individual lighting control system shall be comprised of equipment of a single manufacturer

3)	DEVICES

A.	Provide any additional relays, transformers, power supplies or other necessary devices not specifically listed but required for proper system operation

4)	OVERLOAD AND SHORT CIRCUIT PROTECTION

A.	Provide overload and short circuit protection for all necessary auxiliary equipment

5)	FINISHES

A.	Provide painted surfaces, except as noted, with:

1.	Baked synthetic enamel.

PAINT

2.	Manufacturer's standard color.

3.	Color as per Architect's Specification.

PAINT

4.	Metal parts shall be cleaned and treated with phosphate or chromate bonding process, after fabrication, for maximum paint adhesion

B.	Unpainted aluminum surfaces shall be satin anodized, except as noted

6)	PROTECTIVE DEVICES

NOTE: INDICATE INTERRUPTING RATING ON DRAWINGS OR SCHEDULE.

A.	Circuit breakers shall be fully magnetic, silent-acting when held, unless otherwise noted and shall be manufacturered by Heinemann only

B.	Fuses shall be front mounted on panels. Internal mounting will not be acceptable. Fuses shall be as manufacturered by Bussman or Chase Shawmut only

7)	DIMMER BANK

A.	Dimmer modules.

1.	Provide self contained, factory wired unit.

MOUNT

2.	Provide plug-into dimmer cabinet, with electrical pin connections

3.	Bolt onto dimmer cabinet.

4.	Dimmer modules shall be suitable for installation in dimmer cabinet

MOUNT

5.	Dimmer modules shall be clearly identified with the Manufacturer's name and address, dimmer rating in amps, volts and watts and catalog or serial number

6.	Provide completely solid state utilizing triacs or two silicon controlled rectifiers (SCR) in a back-to-back electrical configuration

a.	Full load of circuits shall be carried and controlled solely by the triacs or SCR's, including incandescent cold filament inrush current

b.	Triacs or SCR's shall produce symmetrical alternating current output which will approach a full sine wave at maximum control voltage

c.	Triacs or SCR's shall be capable of operating over plus or minus 10 percent nominal input voltage variation and shall be designed to prevent false triggering or any interaction between dimmers

7.	Provide each dimmer with a front mounted circuit breaker of appropriate rating to avoid damage caused by overload and short circuit current, serve as disconnect device and operate at not more than 80 percent of rating at full rated load of dimmers

8.	Efficiency shall be a minimum 95 percent at all times and losses shall not exceed 8 watts at no load operation. Output voltage shall be within 5 volts RMS of incoming line voltage when controller is set at "full on"

9.	Output.

a.	"Square law" curve: a change of specified magnitude of control voltage shall produce an apparent corresponding change in light output

b.	Stable output voltage shall be within 2 percent of curve setting regardless of load, ambient temperature, extended operation, or plus or minus 10 percent input voltage variation

c.	Output will repeat regardless of the direction of movement of the controller

10.	Operating conditions.

NOTE: COORDINATE VENTILATION WITH HVAC DEPARTMENT.

a.	Normal operation shall be within 0 deg C to 50 deg C ambient temperature at rated load

b.	Temperature sensing device shall interrupt dimmer operation if safe operating temperatures are exceeded and automatically reset upon return to normal operating temperatures

11.	Filter.

a.	Provide integral inductive toroidal filter network designed to limit incandescent lamp flament vibration, radiated radio frequency interference and conducted radio frequency interference

b.	Current rise time shall limit rate of current rise to 350 milli-amps per microsecond maximium, rise time portion of curve shall approximate a straight line, free of spikes and valleys and shall supply oscillographic evidence of compliance

B.	Dimmer cabinet.

1.	Provide subtantially framed factory assembly enclosed with sheet steel panels

STAND

2.	The cabinet shall be free standing.

3.	The cabinet shall be wall mounted.

STAND

4.	Enclosure shall have provisions for the following:

NOTE: ADD OR DELETE ITEMS AS REQUIRED.

a.	Dimmer modules.

b.	Non-dim modules.

c.	Main disconnect.

d.	Branch circuit breakers.

e.	Power supplies.

f.	Electronic control modules.

g.	Power and control wiring.

h.	Ventilation fans as required.

EMER

i.	Panic and emergency transfer switch.

j.	Panic and emergency coils and relays.

EMER

k.	All other necessary equipment for system to operate as described

5.	Ventilation.

a.	Enclosure panels shall be louvered or pierced to provide necessary ventilation

VENT

b.	Ventilation shall be by natural means only; provide heat sinks as required for normal operation

c.	Provide low noise fans, as required, to maintain proper operating temperatures. Automatic fan shut off shall be activated when all control stations are turned off

VENT

6.	Provide suitable buses for incoming feeders and internal distribution and neutral buses to accommodate branch circuit loads

7.	Factory wiring shall be completely wired internally with terminals of proper rating for external connections and adequate space for contractor wiring

8.	Emergency dimmer shall be separated from normal dimmers by a steel barrier

BREAK

9.	Provide integral front mounted non-automatic circuit breaker for main disconnect device

10.	Provide unfused disconnect switch, as sized and located on drawings, for main disconnect device

BREAK

11.	Control power shall be 24 VDC maximum, supplied by dimming cabinet

C.	Provide electronic control module as needed for dimming systems to operate as described in this Specification

1.	Interface between low-voltage control stations and line voltage power devices

2.	Low and high end adjustment shall limit dimming range as desired

NOTE: COORDINATE FADE RATE CAPABILITIES BETWEEN ELECTRONIC CONTROL MODULE, PRESET PANEL OR CONTROL STATIONS. IF RATE IS TO BE PRESET AT ELECTRONIC CONTROL MODULE, INSERT LENGTH OF TIME BELOW

3.	Preset ------ second fade rate control.

NOTE: RESET PANELS OPTIONAL. COORDINATE WITH CONTROL STATION FUNCTIONS

D.	Provide framed, factory assembled,preset panel with sheet metal enclosure

COVER

1.	The panel shall be front mounted with readily accessible control devices

2.	The panel shall have a hinged front access cover with key lock

COVER

MOUNT

3.	The panel shall be surface mounted on wall as located on drawings

4.	The panel shall be recessed mounted as located on the drawings

MOUNT

5.	One graduated potentiometer shall preset each scene of each channel

POTEN

a.	Potentiometers shall be the linear type with a minimum 1 1/8 inch travel

b.	Potentiometers shall be the circular screwdriver control type

POTEN

c.	Potentiometers shall be arranged logically in rows and columns according to the channel and scene they serve

6.	Provide pilot lights for each scene to indicate activated preset

7.	Provide integral adjustable fade rate controller.

NOTE: DELETE THIS SECTION IF SYSTEM DOES NOT HAVE NON-DIM OPERATION

E.	Provide non-dim module completely interchangeable with dimmer modules and controlled in the same manner as dimmer modules

1.	Raising control potentiometer to a pre-determined level shall energize non-dim module

2.	Lowering potentiometer below predetermined level shall de-energize non-dim module

3.	"On/off" position of non-dim module shall be adjustable over full range of potentiometer

4.	Non-dim circuit shall consist of silent acting mercury switch contactor activated by completely solid state control circuit containing no moving parts

8)	CONTROL STATIONS

A.	Provide control stations as indicated on the contract drawings

B.	Provide 1/8 inch thick aluminum faceplates and mount to appropriate back box as required. Faceplates shall be mounted directly to control electronics

1.	Control device functions shall be permanently labeled as directed

FIN

2.	Finish shall be brushed anodized bronze.

3.	Finish shall be brushed anodized natural.

4.	Finish shall be polished anodized bronze.

5.	Finish shall be polished anodized natural.

6.	Finish shall be baked enamel, color per Architect's Specification

FIN

C.	Pushbuttons shall be the momentary contact type unless otherwise noted

D.	Slider controls shall be graduated linear potentiometers with a minimum travel of 1-1/8 inch

E.	Provide recessed mounted control stations unless otherwise noted

NOTE: PROVIDE COMPLETE DESCRIPTIONS OF EACH TYPE OF CONTROL STATION BELOW, AS NEEDED FOR THE SYSTEM TO OPERATE AS DESCRIBED. THE FEATURES AND FUNCTIONS LISTED HERE ARE ONLY INTENDED AS EXAMPLES, ACTUAL DESCRIPTIONS OF CONTROL STATIONS SHOULD BE DEVELOPED FOR THE SPECIFIC REQUIREMENTS OF EACH DIMMING SYSTEM

F.	Master control station.

1.	Provide 4 channels and 4 pushbutton scene selectors with LED indicators to display activated scene and Scene selectors shall energize lights to preset level

2.	Provide individual graduated preset potentiometers one for each scene of each channel, arranged logically in rows and columns according to the channel and scene they serve. Provide LED indicators for each scene to indicate activated preset

3.	Positive off pushbutton shall de-energize all lights.

4.	Provide adjustable fade rate controller.

5.	Coordinate with audio-visual panel as required.

G.	Portable master control station shall be the same as master control station except station shall have a fully finished aluminum enclosure and a 10 ft cord and male adapter. Provide flush mounted female receptacles as indicated on the drawings

NOTE: PRESET SYSTEM REQUIRED WITH THE FOLLOWING CONTROL STATION.

H.	Preset control station.

1.	Provide 4 channels and 4 pushbutton scene selectors with LED indicators to display activated scene. Scene selectors shall energize lights to preset level

2.	Positive off pushbutton shall de-energize all lights.

NOTE: PRESET SYSTEM REQUIRED WITH THE FOLLOWING CONTROL STATION.

I.	Room entry station.

1.	"On" pushbutton shall energize lights to preset scene No. 1

2.	"Off" pushbutton shall be de-energize all lights regardless of preset condition

J.	Manual slider control station.

1.	Provide 4 channels with individual slide control for each channel which shall set and indicate levels

2.	Single "on/off" pushbutton shall activate station and take control

K.	Panic station.

1.	Provide "Panic" pushbutton with switches designated channels to full-on and clearly marked and distinguished from other controls. LED shall indicate "panic" status

2.	"Normal" pushbutton shall return channels to previously established conditions

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Power wiring shall be in accordance with RACEWAYS and WIRE AND CABLE Sections

B.	Control wiring.

1.	Type and number of conductors shall be as recommended by the lighting control system manufacturer except No. 18 AWG shall be minimum size. Provide minimum ten percent spare conductors

2.	Provide control wiring as necessary for system to operate as described herein

3.	Control wiring shall be installed in metallic raceway, 1/2 inch minimum diameter

C.	Provide branch circuits in accordance with RACEWAYS and WIRE AND CABLE Sections. Each branch circuit shall have separate neutral wire from a separate terminal on main neutral bus

1.	Circuit breakers shall be in accordance with LOW VOLTAGE DISTRIBUTION EQUIPMENT Section for molded case circuit breakers

2)	TESTS AND SERVICES

A.	Tests and services shall be performed by a qualified engineer regularly employed by the lighting control system manufacturer

1.	Check installation prior to energizing the system.

2.	Test and adjust system and insure proper operation in the presence of the Architect and the Engineer

3.	Instruct persons designated by the Owner in the operation and maintenance of the systems and provide 8 hours of instruction for each system