Download - making lighting controls occupant friendly
QMOTION® | VANTAGE® | WATTSTOPPER®
MAKING LIGHTING CONTROLS OCCUPANT
FRIENDLY
1
Shannon J Markey, Regional Manager, Legrand / Wattstopper
QMOTION® | VANTAGE® | WATTSTOPPER®
Credit(s) earned on completion of
this course will be reported to AIA
CES for AIA members.
Certificates of Completion for
both AIA members and non-AIA
members are available upon
request.
This course is registered with AIA
CES for continuing professional
education. As such, it does not
include content that may be
deemed or construed to be an
approval or endorsement by the
AIA of any material of
construction or any method or
manner of
handling, using, distributing, or
dealing in any material or
product. ______________________________________
_
Questions related to specific materials,
methods, and services will be addressed at the
conclusion of this presentation.
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Best practices for design and
commissioning of lighting controls to
make spaces occupant friendly. The
balance between energy savings desire
and occupant revolt.
Course
Description
Learning
Objectives
● How to properly specify lighting controls on a
project to insure you meet all Energy Code
requirements and desires of the owner on a
project.
This insures the project turns out how you want it
to.
● Selecting devices and sequence of operations that
make sense for the occupants and save additional
energy.
This leads to a more comfortable work environment
and prevents the disabling of control devices.
● Writing a proper Sequence of Operations.
This insures that the system is commissioned the
way the designer and the owner want it to be.
● Properly commissioning a project and training the
end user on the system they have.
This will help insure a positive end user experience
after everyone else is gone.
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OBJECTIVES
Suggestions on clearly spelling out design intent on plans so projects turn out the way you anticipate.
Defining a clear Sequence of Operations
Suggest ways of making lighting controls more occupant friendly once installed for those working in commercial office spaces, as well as those maintaining them, while meeting or exceeding local energy codes.
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Codes Call For Controls In Most Spaces And Continue To Become More Strict
• IECC, ASHRAE, T24, State and Local Codes
• Why do we have them & do they work??
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Time Control Normal / After Hours Behavior
Mandatory Dimming Daylighting
Partial Off / Partial On Plug Load Control
Local Occupant Control Exterior Dimming
Demand Response Mandatory Occupancy Sensors
Current Code Requirements
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“Lighting Controls would be much more simple if we could keep the occupants out of the work space.”
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Add various occupants and opinions and things get crazy…
“My lights are too bright!”
“My lights are not
bright enough!
“My lights keep turning off while I am working!”
“The lights are
flickering when I
dim them.”
“How in the heck do I turn
these lights on in the
conference room?”
“What does this
switch do?” “My lights are
dimming
when I close
the blinds!”
“The lights went off
when I was in the
bathroom stall!”
“My lights went off
and my computer
shut down?”
“I can’t work
like this!!”
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What can go wrong…
Donald Trump's team
'having meetings in the
dark as they can't find
right light switch in White
House'
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Control Design
With proper design and installation, Lighting Controls can enhance the work place environment versus irritating and intimidating the occupants as they often do.
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Comparison of Cost Magnitudes in the Typical Commercial Space
Unlike Energy, People/Productivity is difficult to
measure accurately. But a percentage growth
here can produce significant overall rewards
Human Centric Lighting might help with:
Commercial
Retail
Healthcare
Hospitality
Educational
Energy $3 ft2
Lease
People
$30 ft2
$300 ft2
Increased efficiency of
lighting making Lighting
Control ROI improvements
more difficult
Productivity
helped by Great
Lighting +
Effective Controls
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12
The Costs of Keeping Occupants Comfortable
Herman Miller
Aeron Chair
$750 / EA
Fully Stocked High
End Kitchens
Priceless
Dual Screen
Vari-Desk
$475
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Getting things to turn out well on a project takes an investment in time and research
Hoping things will work their way out is probably not the best solution path for any successful controls project.
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Involve the Owner In Decision Making
Determine design objectives with owner other than just meeting the basic energy code:
Occupant Comfort Energy Savings / ROI
Scene Control Reduced Maintenance
Tuned Spaces Improved Productivity
What Else Do They Want Out of Their Lighting Controls?
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Owner Participation
Involve the Owner / End User Early and Often
Use live demo products so owners actually understand what the controls do & what the sequence of operations will be.
Do a mock up of a typical room or two if possible.
A nodding head does not always indicate an understanding of what they are actually getting.
Keep the controls simple on the surface even if they are complex behind the scenes.
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Owner Participation
Balance Energy Savings vs. Occupant Revolt
Disabled Controls = No Savings
Allow occupants some control within their space
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Sequence Of Operations
Define a Clear SOO For Each Space Type
Auto or Manual On?
Pre-Sets Levels and/or Defined Scenes
Occupancy Sensor Time Outs By Area
Daylighting
Normal Hours (NH) / After Hours (AH) Behavior
Temporary Overrides (AH and Daylighting)
Program similar rooms the same way for common functionality and consistency
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Think Through the Sequence by Space
Manual On: Must Manually Turn On Lights, aka “Vacancy Sensor”
Makes sense for areas with good day lighting or easy access to the wall controls.
Auto On: Lights Turn On As You Enter The Room
Where allowable by Code, this makes sense for dark rooms with no windows, spaces where controls are not near entry points, etc. Occupants tend to prefer Auto On.
Partial On: Some Lights Come On To A Level
Actually saves more energy than Manual or Auto. Can be a level or by switch leg and keep the occupants happy while still saving energy.
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46% Less 52% Less
52% Energy Saving with Partial (50%) Auto-On Control Strategy Over Auto-On 100%
Partial On Can Save More Than Auto On
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Think Through The Sequence By Space
Partial Off: Go to a level other than Off Makes sense for Hallways, Stairwells, Restrooms, Parking Garages, etc.
Allow lights to stay on at a lower level when unoccupied. Increases occupant comfort level as they are not entering a completely dark space.
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Think Through The Sequence By Space
Presets: Lights turn on at a pre-determined level. In spaces that are occupied by many different people,
have lights always come on to a comfortable and consistent
level for all.
A “Last Level” can bring them on too low or too high. Too Low can generate unneeded calls to maintenance, and too high can cause occupants to complain. Shoot for consistency. Typically the occupants will have the lights below 100%.
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Sequence of Operations
Consider Occupants & Spaces When Determining the Sequence of Operations For The Project
Private Interior Office
Private Exterior Office
Open Office Areas
Classrooms
Hallways / Corridors
Break Room
Public Restroom
Conference Rooms
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Sequence of Operations: Private Interior Office
Single occupant and always the same person. No daylight.
SoO: Auto or Manual On to Preset Level
Manual Dimming to 10%
20 Minute Sensor Time Out
Plug Load Control (Sensor)
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Sequence Of Operations: Private Exterior Office
Single occupant and always the same person. Daylighting.
SoO: Manual On to Preset Level
Daylighting w/ Temporary Override
Dimming to 10%
20 Minute Sensor Time Out
Plug Load Control (Sensor)
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Sequence Of Operations: Open Office
Large number of ever changing occupants
SoO: Auto On To Preset Level (Consistent)
Daylighting w/ Temporary Override
Local Dimming to 10%
20 Minute Sensor Time Out NH & AH
Plug Load Control: Auto On / Auto Off
2 Hour After Hours Override w/
Blink Warn
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Sequence Of Operations: Conference Room
Revolving occupants.
Mixed Uses
SoO: Auto On To Preset Level (Consistent)
Daylighting w/ Temporary Override
Local Dimming to 1-5% for AV
20 Minute Sensor Time Out
Plug Load Control Auto On / Auto Off
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Sequence Of Operations: Classroom
Rotating Teachers, Different Students, Custodial, etc.
SoO: Auto On To Preset Level (Consistent)
Simple Control at Entry Points (On/Off)
Scene Control / Dimming at Teacher Station (Engraved)
Daylighting w/ Temporary Override
Local Dimming to 1-5% for AV
20 Minute Sensor Time Out NH
5 Minute Sensor Time Out AH
Plug Load Control Auto On / Auto Off
Door Control Teacher Station
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Sequence Of Operations: Hallway / Corridor:
Various occupants for short periods. Limited
control by occupants / security issues
SoO: Auto On to 100% NH
Partial Off to 20% During NH
10 Minute Time Delay NH
Auto On to 80% AH
Auto Off During AH
5 Minute Time Delay After Hours
No Daylighting Overrides
Secured Local Controls (Keyed Switch)
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Sequence Of Operations: Break Room
Revolving occupants for short periods.
SoO: Auto On to 50% / Manual to 100% NH
Local Dimming Override
5 Minute Sensor Time Out NH & AH*
*The less time a room is occupied, the more
energy savings that can be attained by reducing
sensor time outs.
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Sequence Of Operations: Public Restroom
Revolving occupants.
SoO: Auto On To 100% NH
Partial Off To 10-20% NH
Auto On to 80% AH
Auto Off To 0% AH
Local Keyed Switch Override / Dim
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Sequence of Operations
Include the Sequence of Operations on the construction documents. Written or Matrix by room or space type
Written Style SoO: Corridor
During normal hours the hallway will be at 100% illumination when occupied. After being
unoccupied for 10 minutes, the lights will drop to 20% light output and return to 100%
when someone enters again.
During after hours the hallway shall be completely off when unoccupied and illuminate
to 50% when occupied. The time delay will be 5 minutes.
At all times under Normal Power, the Emergency Fixtures shall turn on and off and dim
with Normal Fixtures. Upon loss of normal power, Emergency Fixtures Shall Illuminate
to 100%.
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Sequence of Operations
Matrix Style SoO
Clearly states Room Type, Type of Sensor, Daylighting, HVAC
Interface, Global Network, Local Control, Schedule and
Occupancy Sensor Behavior.
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Importance Of The Meaning of Terms
Start Up/Programming, Testing & Commissioning
These three terms are incorrectly inter-changed, as they do not mean the same thing.
Start Up is Programming and Calibration. This is typically performed by the manufacturer and/or contractor.
Acceptance Testing is a defined schedule of testing that may be done by a commissioning agent, or by an Acceptance Test technician where required (T24).
Commissioning is done by an independent agent to verify the prior was done correctly per specifications.
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Start Up & Programming Four Suggested Items for Every Specification
1) Mandatory Pre-wire Visit by
Manufacturer/Representative and Electrical
Contractor to review installation BEFORE Install
All systems install differently and EC's are
installing different systems weekly.
Installed System is often NOT the Basis of Design
Call out a specific time for it to happen.
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Start Up & Programming
2) All devices installed per specific manufacturer’s recommendations and shop drawings
Devices don’t work when installed incorrectly.
Install Instructions Field Installation
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Start Up & Programming
3) Programming performed by a factory person or authorized technician. Include full documentation for the owner of all devices, settings, etc.
This is important for the owner down the line when they need factory support and all the other players have
moved on to other projects.
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Start Up & Programming
4) Owner training at turn over of building with a
second training 60-90 days after occupancy
Single best thing you can do for end user
End of job is extremely chaotic and overwhelming. The occupants are not even in the building yet. A day to re- train, tune, adjust, etc.
Have Manufacturer Provide Additional Remote Live Support for 1 Year Minimum
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Commissioning
If not required by Code, also call for
basic commissioning of system by an
independent party to insure things are
installed correctly and working per
specification.
Hold installer responsible for any corrections that need to be made for proper operation.
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Local Area Control
Required by most Energy Codes, but include even if not required. Allows occupants to feel in control. Given the option, lights will typically be lower than if controlled automatically.
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Dim rather than Switch
Would you have an audio system with just 2-3 settings, or no temperature control in a room?
So Why Do That For The Lighting? Dim The Lights
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Dim rather than Switch
Unlike traditional light sources, LEDs
allow for dimming at little or no additional
cost w/ 0-10v.
Allow the occupant to dim lights as well
as switch. Most of time they want the
lights lower than a control device (PC) may
set them.
Provides a more comfortable work setting while
saving additional energy. Can also increase
the life of electronics by reducing heat.
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Dimming Allows Occupant Comfort In The Space
Occupant Signage Homemade Light Filters
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Dimming Allows Occupant Comfort In The Space
The Herman Miller Cubicle Tent
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Benefits of Dimming
Dimming Provides Energy Savings In two ways:
Reduction of energy use for
lighting which is one of largest
energy users traditionally.
Reduces Cooling Load in a 3:1 ratio.
Cooling is typically 3-5 times heating
Usage.
Lighting: 44%
Cooling: 14%
Heating: 3%
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Importance of Tuning
0-10V is widely accepted and inexpensive.
There are issues as the dimming curve is not 100% linear, with no change between 0-1V or between 9-10V.
Some drivers also drop out or flicker at points between 0-3V.
The fixture may appear to be off when there is still power flowing to the fixture through the relay.
Set the trims accordingly so you have even linear dimming and lights only appear off when they are actually off.
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Daylighting
The most challenging lighting control; yet it offers significant energy savings potential.
Difficult because we’re taking a reading at the ceiling to set a level at the task or floor.
Use the right PC for the Application Closed Loop: Single Zone Control
Open Loop: Multiple Zone Device
Dual Loop: Skylight Applications
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Daylighting: Closed Loop Sensor
A closed loop sensor reads at a single point in the space, so it is a single zone control. Very difficult to control a second zone properly. Using 2 can cause dueling control devices.
Works off reflected light, so sometimes it does not work well in mounting applications above 10-12’ or areas with poor reflectance.
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Daylighting – Open Loop Sensor
Reads light level at the window, and should not see any electric light in the room.
Properly calibrated, one photocell can control multiple zones independently based on the daylight contribution.
Increases energy savings and
reduces cost and device count.
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Daylighting – Dual Loop Sensor
Uses both open and closed loop technology to properly adjust lighting in skylight applications. Reduces challenges of either technology.
Different sun angles determine light
levels getting to work plane or floor.
Adjustable closed loop
view based on mounting
height.
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Why Dual Loop?
Skylighting is very effective when the sun is high, but can be ineffective with low sun angles where most of the light is in the well vs on the floor.
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Daylighting
If allowable by code, allow temporary override of daylighting for occupants based on time or through period of occupancy
HS Classroom: 1 -2 Hours
Grade School Classroom: 4 hours / half day
College Classroom: 1-3 hours
Private Office: 4 hours / half day
If not allowable by Code, consider adding it after occupancy and sign
Off. Lights at Mow End Save More Energy Than a Disabled PC.
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Daylighting
A temporary override saves more energy than a permanently disabled photocell. Not allowing an override is only good for 3M and Post-It Sales.
Recent TI in San Francisco had 21 of 24 PC’s disabled within 2 weeks of
occupancy. Reprogrammed area to allow temporary over ride and not
one disabled photocell after 9 months.
Designer Try-Try Again Upgraded Basic
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Daylighting
Even Saw This In An Electrical Engineer’s Office
Is That A
Retro 70’s
Cylinder
Downlight?
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No. It’s A
Photocell
With A
Recycled
Coffee Cup
Around It.
Daylighting
The mechanical permanent override.
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Other Daylight Factors
Other Things Can Influence The Photocell That May Cause The Need For An Override
Inverted Blinds Interior Light Shelves Reflective Strit on Window
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Photocell Placement
Consult brand that is basis of design and place the device on your plans as close to where it should be mounted as possible. “Typical” location can be misleading and cost money.
Ericsson Project where they installed 2 multi-zone PC’s in each space when only one was needed. 50 additional sensors at $5000 in cost. Very expensive spares.
Weyerhaeuser Project: 35 Open Loop Sensors Placed in Center of Room Looking at the Side of a Fixture. WH uses Wood instead of Ceiling Tiles. No Functional Daylighting in the majority of a LEED Building.
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Photocell Install: Closed Loop
Make Sure Sensors Are Mounted Per Install Instructions or They Will Not Work Correctly Closed Loop Sensor
Placed behind Fixture with
Indirect Light shining on it
Ideal Placement
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Photocell Install: Open Loop
Make Sure Sensors Are Mounted Per Install Instructions or They Will Not Work Correctly. Open Loop Sensor
Photocell Dangling In
Space Aimed In Room Ideal Placement
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Photocell Placement
Open Loop Sensor Looking Away From
Window And Tucked Into Ductwork. Open Loop Sensor oriented to
read the wall vs out window.
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Photocell Commissioning
If the PC’s aren’t positioned correctly, make the EC move them to proper location during commissioning process.
PC Looking At Wall 5’
Above Window
PC Tucked Between
Ductwork & Wall PC Looking At Wall
Instead of Window
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Photocell Install
Don’t use multiple photocells in the same or adjoining space / zone.
UW dueling photocells controlling the same fixture in daylight zone.
Switched uplight, dimmed downlight. A constant cycling of lamps for control.
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Daylighting Perception
Human Element: Not always the actual light level, but the occupants perception of it.
Ben Rush Elementary: “The lights are too dim in the daylight zone.
Your PC is not working correctly” – Commissioning Agent
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Daylighting Reality
Daylight Zone: 10% Light Output / 74.8 FC
Non Daylight: 100% Light Output / 56.3 FC
Daylight Zone: 74.8 FC Non Daylight: 56.3 FC
Focus on the Task, Not the Ceiling
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Calibrate At The Right Time
Photocells should be calibrated when room is completely furnished for optimum performance. NOT during construction.
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Adjustments To Day Light Sensors
Make It Easy To Re-Calibrate As It is Often Needed.
All Adjustments made On Fixture Sensor. Classrooms were mounted
at 7’, Library at 20’ and Main Lobby Area at 35’. The Commissioning
Agent put it best: “WTF?” Vernonia HS, OR
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User Interfaces
Don’t Assume The Occupant Knows How To Operate Anything Other Than A Normal Switch
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User Interfaces
Use Intuitive User Interfaces That Don’t Intimidate Occupants
These Do The Same Functions
Simple Control Complicated Controls
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User Interfaces
• Use Words or Easy To Understand Symbols
Semi-Intuitive Buttons
Lit Lamp Means On / Up Triangle = Raise
Black Lamp Means Off / Down Triangle = Lower
Less Intuitive Buttons
What Does A Clockwise Arrow Around A Mountain Mean?
How About A Counter Clockwise Arrow w/ Auto Under It?
Imagine You Are An Occupant Walking Into The Room For The First Time.
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User Interfaces
Other Than Looking Like A Pig,
What Does This Switch Do?
How do I Turn The Lights On?
How Do I Turn The Lights Off?
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User Interfaces
Use Words or Easy To Understand Symbols
What Are Scenes 1-7?
Can an occupant actually come up with, let alone
remember, 7 Scenes?
OFF Makes Great Sense, As Well As
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User Interfaces
Engrave all devices in Common Spaces With Revolving Occupants With Specific Information
Better Best Bad
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User Interfaces
Don’t make the owner or occupants create their own.
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User Interfaces
Inform occupants if possible. They are typically not at training sessions on the system.
Not only informational, but makes
occupants feel good about saving energy.
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Overrides
Override zones instead of individual Switch Legs. Consolidate Switches in some reasonable manner.
North 1 North 2 South 1 South 2
North 3 North 4 South 3 South 4
East 1 East 2 West 1 West 2
East 3 East 4 West 3 West 4
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User Interfaces
Use Scene Control Instead of Individual Devices For More Complex Spaces
…Not this This...
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User Interfaces
Even Touchscreens Should be Set Up With Simple Menus and Can Include Control of Things Other Than Lighting
Shades
Projection Screens
HVAC
Audio
Shade Control
Lighting Control Temp
Control
Odor Control
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Plug Load Control
Now in ASHRAE, T24, WA State & Seattle Energy Codes. Use Occupancy Sensor vs Time Control: Auto On / Auto Off
Phantom Loads Heaters Task Lamps
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Plug Load Control
Clearly Mark all controlled Plug Loads – a different color stands out more than a small marking Plugs are usually located under a dark desk or 4’ below eye level
People get upset when their computer turns off or their fish die..
Plug Load at OHSU in Portland & Goldie
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Occupancy Sensors
There are 2 Occupancy Sensor Technologies Used By The Majority of Manufacturers
Passive Infrared Ultrasonic
You Want To Specify The Right Technology For Each Space on The Project.
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Occupancy Sensors
Passive Infrared Technology
Positives: Passive Allows It To Be Used Wirelessly
Directional and Controllable
Hi Mounting Height / Exterior
Very Few False Triggers
Negatives: Can’t Easily Detect Minor Movement
Line of Sight Device: Does Not Work If It Can’t See You
Coverage Pattern
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Occupancy Sensors
Ultrasonic Technology
Positives: Sees Around Objects Detects Minor Motion Very Well Quick Activation
Negatives: Susceptible To False Triggers Activated By Non-Human Conditions – Volumetric Not Effective Over 12’ or so
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Dual Technology
Positives: Best of Both Technologies Limit False Ons With Both Technologies Needed To Activate. Limit False Off’s With Either Technology Re-Triggering
Negatives: More Expensive. Good CYA Device, But Don’t Pay For It If You Don’t Need It.
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Occupancy Sensors: Where to Use Technologies
Specify the correct sensor for the appropriate application.
PIR: Small Private Offices, High Mounting Areas, Small
Storage Rooms, Exterior, Rooms w/Ceiling Fans
US: Hallways, Bathrooms, Open Office
DT: Mixed Activity areas: Classrooms, Conference
Rooms, Etc.
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The Wrong Technology
Specifying The Wrong Sensor Technology Can Cause Human Intervention
Sandy HS: High Ceiling, But they used
standard DT sensors. Lots of dead spots.
Teacher put up a helium balloon so the lights
would never turn off. The HVAC would move
it around so the sensor always picked up
motion. I was called out by maintenance
because “the sensor wasn’t working correctly.”
Helium Balloon
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Time Delays
Occupancy sensors save the most energy in rooms that are occupied for short periods of time.
Don’t reduce sensors too low in high occupancy rooms or you can create nuisance offs when room is not fully occupied.
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SENSOR TIME DELAY (MINUTES)
Space 5 10 15 20 5 min.
impact
Break Room 29.0% 25.0% 21.0% 17.0% 23%
Classroom 58.0% 56.0% 54.0% 52.0% 3%
Conference
Room
50.0% 46.3% 42.7% 39.0% 32%
Private Office 38.0% 34.7% 31.3% 28.0% 11%
Rest Room 60.0% 55.7% 51.3% 47.0% 9%
The shorter period of time for typical occupancy, the more savings from sensor
time out reductions
Time delays can greatly increase energy savings
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Occupancy Sensor Placement
30’ x 30’ Classroom w/ 1 DT Sensor
4-5 Steps Needed
To Activate Sensor
With Auto On
Scenario.
Must Break Two
Zones To Activate
Sensor.
Teacher Is In
The Dead
Zone. Time For
A 20 Minute
Hand Wave.
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Occupancy Sensor Placement
30’ x 30’ Classroom w/ 2 DT Sensors
One Step Activation
At Doorway.
Teacher’s
Desk Is
Covered
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Occupancy Sensor Placement
When placing occupancy sensors, consider not only motion and activity patterns in space, but also entry points to the space, traffic flow, etc.
Example: In a parking garage, the most important areas are the entry points; not the majority of the garage. If a sensor is activated at an elevator with a 10 minute time delay, there is plenty of time for an occupant to get to their car.
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Occupancy Sensor Placement
Make sure the sensors are installed per manufacturers suggested mounting.
Mount all occupancy sensors 6’ away from air ducts to
prevent both false triggers holding on sensors.
QMOTION® | VANTAGE® | WATTSTOPPER®
Occupancy Sensor Placement
That was 6’, not 6”.
6’ does not mean 2’ either.
QMOTION® | VANTAGE® | WATTSTOPPER®
Occupancy Sensor Placement
And it definitely DID NOT mean negative 6”!!
QMOTION® | VANTAGE® | WATTSTOPPER®
Occupancy Sensor Placement
For Best Performance…
Don’t mount wall sensors on
ceiling looking at the floor.
Don’t mount directional wall
sensors upside down .
QMOTION® | VANTAGE® | WATTSTOPPER®
Occupancy Sensor Placement
Don’t mount wall switch
sensors on the ceiling;
especially with manual
on operation. Can be a
little challenging to turn
lights on.
Sprinkler
Head
Manual On
Wall Switch.
QMOTION® | VANTAGE® | WATTSTOPPER®
Occupancy Sensor Placement
Don’t Mount A PIR Sensor Nest To
The Urinal If There Is A Stall Next
Door.
Nor Should You Mount In
A Stall At 7’ When There
Is A Urinal Next To it.
Wall
Switch
Sensors
QMOTION® | VANTAGE® | WATTSTOPPER®
Review
Clearly Define The Sequence Of Operations By Space.
Involve the Owner In Decision Making.
Install Products Correctly In a User Friendly Way
Factory Authorized System Programming / .
Properly Commission Space
Fully Train and Support Owner
Follow Up Tuning and Training for the Owner.
QMOTION® | VANTAGE® | WATTSTOPPER®
This concludes The American Institute of Architects
Continuing Education Systems Course
Shannon Markey
Western Regional Manager Legrand / Wattstopper
Cell: 971 212-4207
Email: [email protected]
QMOTION® | VANTAGE® | WATTSTOPPER®
Please remember to complete the
course evaluations. Thank you.
QMOTION® | VANTAGE® | WATTSTOPPER®
THANK YOU www.legrand.us/wattstopper
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