Nonresidential, and hotel/motel buildings shall comply with the applicable requirements of Sections 120.2(a) through 120.2(k).
The supply of heating and cooling energy to each space-conditioning zone or dwelling unit shall be controlled by an individual thermostatic control that responds to temperature within the zone and that meets the applicable requirements of Section 120.2(b). An Energy Management Control System (EMCS) may be installed to comply with the requirements of one or more thermostatic controls if it complies with all applicable requirements for each thermostatic control.
EXCEPTION to Section 120.2(a): An independent perimeter heating or cooling system may serve more than one zone without individual thermostatic controls if:
The individual thermostatic controls required by Section 120.2(a) shall meet the following requirements as applicable:
EXCEPTION 1 to Section 120.2(b)3: Systems with thermostats that require manual changeover between heating and cooling modes.
EXCEPTION 2 to Section 120.2(b)3: Systems serving healthcare facilities.
EXCEPTION 1 to Section 120.2(b)4: Systems serving exempt process loads that must have constant temperatures to prevent degradation of materials, a process, plants or animals.
EXCEPTION 2 to Section 120.2(b)4: Package terminal air conditioners, package terminal heat pumps, room air conditioners, and room air-conditioner heat pumps.
EXCEPTION 3 to Section 120.2(b)4: Systems serving healthcare facilities.
EXCEPTION to Section 120.2(c)1: Thermostats that are integrated into the room heating and cooling equipment.
All heat pumps with supplementary electric resistance heaters shall be installed with controls that comply with Section 110.2(b).
Each space-conditioning system shall be installed with controls that comply with the following:
EXCEPTION to Section 120.2(e)1: Mechanical systems serving retail stores and associated malls, restaurants, grocery stores, churches, and theaters equipped with 7-day programmable timers.
EXCEPTION to Section 120.2(e)2A: Thermostat setback controls are not required in nonresidential buildings in areas where the Winter Median of Extremes outdoor air temperature determined in accordance with Section 140.4(b)3 is greater than 32°F.
EXCEPTION to Section 120.2(e)2B: Thermostat setup controls are not required in nonresidential buildings in areas where the Summer Design Dry Bulb 0.5 percent temperature determined in accordance with Section 140.4(b)3 is less than 100°F.
EXCEPTION 1 to Sections 120.2(e)1, 2, 3: Where it can be demonstrated to the satisfaction of the enforcing agency that the system serves an area that must operate continuously.
EXCEPTION 2 to Sections 120.2(e)1, 2, 3: Systems with full load demands of 2 kW or less, if they have a readily accessible manual shut-off switch.
EXCEPTION 3 to Sections 120.2(e)1 and 2: Systems serving hotel/motel guest rooms, if they have a readily accessible manual shut-off switch.
EXCEPTION to Section 120.2(e): Systems serving healthcare facilities.
Outdoor air supply and exhaust equipment shall be installed with dampers that automatically close upon fan shutdown.
EXCEPTION 1 to Section 120.2(f): Equipment that serves an area that must operate continuously.
EXCEPTION 2 to Section 120.2(f): Gravity and other nonelectrical equipment that has readily accessible manual damper controls.
EXCEPTION 3 to Section 120.2(f): At combustion air intakes and shaft vents.
EXCEPTION 4 to Section 120.2(f): Where prohibited by other provisions of law.
Each space-conditioning system serving multiple zones with a combined conditioned floor area of more than 25,000 square feet shall be designed, installed, and controlled to serve isolation areas.
EXCEPTION to Section 120.2(g): Zones designed to be conditioned continuously.
See Section 110.12 for requirements for Automatic Demand Shed Controls.
All newly installed air handlers with a mechanical cooling capacity over 33,000 Btu/hr and an installed air economizer shall include a stand-alone or integrated Fault Detection and Diagnostics (FDD) system in accordance with Subsections 120.2(i)1 through 120.2(i)8.
EXCEPTION to Section 120.2(i)8: FDD algorithms based in Direct Digital Control systems are not required to be certified to the Energy Commission.
Direct Digital Controls to the zone shall be provided as specified by Table 120.2-A.
The provided DDC system shall meet the control logic requirements of Sections 120.1(d), 110.12(a) and 110.12(b), and be capable of the following:
Building Status | Applications | Qualifications |
Newly Constructed Buildings | Air-handling system and all zones served by the system | Individual systems supplying more than three zones and with design heating or cooling capacity of 300 kBtu /h and larger |
Newly Constructed Buildings | Chilled water plant and all coils and terminal units served by the system | Individual plants supplying more than three zones and with design cooling capacity of 300 kBtu /h (87.9 kW) and larger |
Newly Constructed Buildings | Hot water plant and all coils and terminal units served by the system | Individual plants supplying more than three zones and with design heating capacity of 300 kBtu /h (87.9 kW) and larger |
Additions or Alterations | Zone terminal unit such as VAV box | Where existing zones served by the same air-handling, chilled water, or hot water systems that have DDC |
Additions or Alterations | Air-handling system or fan coil | Where existing air-handling system(s) and fan coil(s) served by the same chilled or hot water plant have DDC |
Additions or Alterations | New air-handling system and all new zones served by the system | Individual systems with design heating or cooling capacity of 300 kBtu /h and larger and supplying more than three zones and more than 75 percent of zones are new |
Additions or Alterations | New or upgraded chilled water plant | Where all chillers are new and plant design cooling capacity is 300 kBtu /h (87.9 kW) and larger |
Additions or Alterations | New or upgraded hot water plant | Where all boilers are new and plant design heating capacity is 300 kBtu /h (87.9 kW) and larger |
Space conditioning systems with DDC to the zone level shall have optimum start/stop controls. The control algorithm shall, as a minimum, be a function of the difference between space temperature and occupied setpoint, the outdoor air temperature, and the amount of time prior to scheduled occupancy. Mass radiant floor slab systems shall incorporate floor temperature onto the optimum start algorithm.
EXCEPTION to Section 120.2(k): Systems that must operate continuously.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code.