ASHRAE 2019: Application Guide
ASHRAE Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years. This standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. It offers, in detail, the minimum energy efficiency requirements for design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems.
Lighting
Modified lighting power allowances for Space-by-Space Method and the Building Area Method
New simplified method for lighting for contractors and designers of renovated office buildings and retail buildings up to 25,000 ft2 (2300 m2).
Updated lighting control requirements for parking garages to account for the use of LEDs
Updated daylight responsive requirements, added definition for “continuous dimming” based on NEMA LSD-64-2014
Clarified side-lighting requirements and associated exceptions
1. Manual control shall be accomplished using keypads, wallbox dimmers, touchscreens or other types of manual override.
2. Programmable timeclock shall be accomplished using a networked lighting control system.
3. Automatic daylight responsive controls are mandatory only if the requirements of the specified sections are present.
4. Lighting in open-plan office spaces shall be allowed to turn on automatically to more than 50%, provided the control zone is no larger than 600 ft2.
5. For Private offices enclosed and ≤250 ft2 programmable timeclock is not permitted as an alternative for automatic OFF/partial OFF
6. To comply with life safety code requirements automatic full OFF is not suggested for egress illumination in interior exit stairways, exit ramps, and exit passageways. For non-egress areas, the occupancy sensor should turn the lights to full OFF and a switching control may be used. When space is inactive for 20 minutes or less the lighting shall reduce by a minimum of 50%.
7. All building façade and landscape lighting shall be automatically shut off between midnight or business closing, whichever is later.
8. Programmable timeclock ensures the fixtures will be ON when normally occupied. Occupancy sensor controls the fixtures when normally unoccupied and reduces each luminaire output by 30% after 20 minutes of inactivity.
9. Sleeping units shall have control devices or systems that are configured to automatically switch OFF all permanently installed luminaires – including those energized via receptacles – within 20 minutes of vacancy.
10. At least 50% of all 125 V, 15 and 20 amp receptacles shall be automatically controlled and at least 25% of branch circuit feeders installed for modular furniture not shown on construction documents.
MINIMUM CONTROLS
DESCRIPTION
CODE PROVISION
Manual Control Device
Local Control:
One or more manual lighting controls in the space that controls all of the lighting.
Each control device shall control an area (1) no larger than 2500 ft2 if the space is ≤10,000 ft2 and (2) no larger than 10,000 ft2 otherwise.
Occupants should be able to see the controlled lighting when using the control device. Manual control shall allow occupant to reduce lighting by a minimum of 50%.
9.4.1.1[a]
Programmable Timeclock
Interior:
Restricted to partial automatic ON: No more than 50% of the lighting power for the general lighting shall be allowed to be automatically turned on.
Scheduled shutoff: shall be automatically shut off during periods when the space is scheduled to be unoccupied using either (1) a time-of-day operated control device that automatically turns the lighting off at specific programmed times of (2) a signal from another automatic control device or alarm/security system.
Exterior:
Scheduled partial ON based on time-of-day and sunrise/sunset. Manual override not required for exterior timeclock controlled spaces.
9.4.1.1[c]
9.4.1.1[i]
Occupancy Sensor
Interior:
Restricted to partial automatic ON: No more than 50% of the lighting power for the general lighting shall be allowed to be automatically turned on.
Automatic full OFF: shall be automatically shut off within 20 minutes of all occupants leaving the space.
Exterior:
Occupancy sensors shall be required for parking garage in conjunction with programmable timeclock. Luminaires serving outdoor parking areas greater than 78 W and a mounting height of 24 ft or less shall be controlled to automatically reduce the power by a minimum of 50% when no activity has been detected no longer than 10 minutes. No more than 1500 W of lighting power shall be controlled together.
9.4.1.1[c]
9.4.1.1[h]
Vacancy Sensor
Restricted to manual ON: None of the lighting shall be automatically turned on.
Automatic full OFF: shall be automatically shut off within 20 minutes of all occupants leaving the space.
9.4.1.1[b]
9.4.1.1[h]
Daylight Response
Automatic Daylight Responsive Controls for Sidelighting
Interior:
The photocontrol shall reduce electric lighting power in response to available daylight using continuous dimming to 20% or less and off in any space where the combined input power of all general lighting completely or partially within the primary skylighted or sidelighted areas is 150 W or greater.
Sidelighted areas where the total glazing area is less than20 ft2.
Exterior:
Lighting shall be controlled by a device that automatically turns off the lighting when sufficient daylight is available.
9.4.1.1[e]
9.4.1.4[a]
Controlled Receptacles
A scheduled basis control device using programmed time of day to turn off receptacles - independent program for areas no more than 5000 ft2 and not more than one floor (manual override capability for up to two hours).
Occupant sensor shall turn receptacles off within 20 minutes of all vacancy; OR
Automated signal from another control or alarm system that shall turn receptacles off within 20 minutes of vacancy
In a guest room application, all permanently installed luminaires - including those energized via a receptacle - shall turn OFF within 20 minutes of vacancy.
8.4.2[a]
8.4.2[b]
8.4.2[c]
