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NC-v4 EAp2:Minimum energy performance

only automatic control in offices for lights

Can the lighting control in offices be automatic (daylighting + occupancy sensors) only? I mean, without manual control?

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 03/21/2018 - 18:49

Do any ASHRAE 90.1-2010 mandatory provisions require manual control if occupancy and daylight controls are present?

Thu, 03/22/2018 - 09:06

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.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 03/22/2018 - 14:00

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.

Fri, 01/17/2020 - 12:59

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?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 01/21/2020 - 20:10

Yes the dimming will count as the required step control.

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