Can the lighting control in offices be automatic (daylighting + occupancy sensors) only? I mean, without manual control?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
March 21, 2018 - 2:49 pm
Do any ASHRAE 90.1-2010 mandatory provisions require manual control if occupancy and daylight controls are present?
Francesco Passerini
R2M Solution Srl16 thumbs up
March 22, 2018 - 5:06 am
Hello, I think they don't. I read "Each manual device shall be readily accessible and located so the occupants can see the controlled lighting" but I think the manual control is not mandatory.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
March 22, 2018 - 10:00 am
If it is not required in the mandatory provisions, it is not required. As far as the energy model is concerned the lighting runs on a schedule so the switches don't impact anything.
Agnieszka Rylska
GO4IT SP Z OO SP K29 thumbs up
January 17, 2020 - 7:59 am
Dear Marcus,
I have a follow up question. If we only have automatic lighting control (daylighting + occupancy sensors only) in open office space does this also comply with the requirement of section 9.4.1.2a: "a. The controlled lighting shall have at least one control step between 30 % and 70 % (inclusive) of full lighting power in addition to all off"? Can daylighting sensors which are dimming the lights automatically count as one control step between 30 and 70% or do we have to add a manual switch which will e.g. turn on a few fixtures which result in 30-70% of lighting power?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
January 21, 2020 - 3:10 pm
Yes the dimming will count as the required step control.