ASHRAE 90.1 2010 9.4.1.2 Space Control states:
"Each space enclosed by ceiling height partitions shall have at least one control device to independently control the general lighting within the space. Each manual device shall be readily accessible and located so the occupants can see the controlled lighting. All controlled lighting shall meet the following requirements:
The controlled lighting shall have at least one control step between 30% and 70% (inclusive) of full lighting power in addition to all off."
For projects outside the US is this required ?
If you are using occupancy control and daylight harvesting does this comply by itself ?
Any feedback on the requirement to include this for lighting designs would be very useful.
Thanks.
Waleed AlGhamdi
Sustainability EnablerEskew+Dumez+Ripple
20 thumbs up
May 22, 2019 - 11:08 am
Section 9.4.1 Lighting Control states that "Any automatic control device required in sections 9.4.1.1, 9.4.1.2, and 9.4.1.6 shall either be manual on or shall be controlled to automatically turn the lighting on to not more than 50% power, except in...". The logic here seems to be reducing the amount of time a lighting system is turned on to 100% by requiring human intervention, otherwise it's either off or only on with half the power. Item a. under 9.4.1.2 seems to serve the same purpose for manual controls. The way I interpret this is that a simple on/off occupancy sensor doesn't comply. It needs to be either "manual on/auto off" or "auto on 50%/manual on 100%/auto off". Daylight sensors only work during daytime and won't help control light during night time, so I don't think the combination automatically complies (maybe a custom system would?).
Note that these apply to different spaces in different ways. For example, I don't believe an open plan office space is considered "enclosed by ceiling height partitions" but a private office would.
It seems like the direction ASHRAE is taking this is meant to have lighting and plug loads having a complex control logic instead of the old simple auto on/auto off lighting controls. The 2013 version introduced many scenarios that makes planning for lighting controls a serious exercise. If you look at a system like LUTRON VIVE you'll get an idea about where these controls are headed.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
May 22, 2019 - 2:57 pm
Yes all LEED projects must meet the mandatory provisions.
Yes occupancy control and most daylighting control systems in combination would comply.
Ciaran McCabe
DirectorPassive Dynamics Sustainability Consultants
12 thumbs up
May 22, 2019 - 3:20 pm
Thanks guys.
Just so I am clear. In situations where there is occupancy control (on / off) and daylight harvesting control this would meet the requirements. It this correct ? Did the GBCI release any clarifications on this ?
Also in internal rooms where there is no windows and there is no daylight harvesting is there a requirement for additional switching ?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
May 29, 2019 - 9:45 am
Yes they should meet the requirements. I am not aware of any clarification on this issue from GBCI.
Compliance with 9.4.1.2 may require additional switching to meet the requirements of 9.4.1.2 (a)
Ciaran McCabe
DirectorPassive Dynamics Sustainability Consultants
12 thumbs up
June 27, 2019 - 1:38 pm
Struggling to find a conclusive answer on this. Contacted the GBCI a few times - with now solid reply. Has anyone got through a review with standard occupancy sensors and daylight harvesting controls. For example will this meet the requirements that the controlled lighting shall have at least one control step between 30% and 70% (inclusive) of full lighting power in addition to all off." The lighting will be ramping up and down anyway with the daylight control. Any feedback ?
Edna Urias
Project ManagerDesarrolladora Seica SA de CV
1 thumbs up
July 30, 2019 - 4:09 pm
Hello Ciaran, I have not jet certified an Interior project but have certified a C & S project and we did install a Lighting Control Panel for all interior and exterior lighting, general lighting fixtures had occupancy sensors and infrared for daylight harvesting, the panel controls lighting by scheduling the amount of fixtures that will turn on according to the astronomical setup. The GBCI review had no additional requests after submitting the information for lighting control. We are now working in a commercial interior project where we will be intalling the same panel.
Regards!