1003.2 Requirements for Alterations

Dedicated individual utility or private metering devices that measure and verify energy and water use within the building or space shall be provided for at least one of the following:

1. Electrical energy consumption for individual tenant spaces.
2. Water consumption for individual tenant spaces.
3. Natural gas or fuel oil consumption for individual tenant spaces.
4. Lighting loads.
5. Motor and drive loads.
6. Chiller part-load efficiency.
7. Cooling loads.
8. Economizer and heat recovery loads.
9. Boiler efficiencies.
10. Building process systems and equipment loads.
11. Water consumption for landscape irrigation.

Heating, ventilating and air-conditioning systems and equipment shall be in accordance with the following:

1. Time clock and automatic time switch controls that can turn systems off and on according to building occupancy requirements shall be provided and connected to the following HVAC equipment: chillers and other space-cooling equipment, chilled water pumps, boilers and other space-heating devices, hot water pumps, heat exchanger circulation pumps, supply fans, return fans, and exhaust fans. Where occupant override is provided, it shall be designed with a timer to automatically revert to time clock and automatic time switch controls in not longer than 12 hours.
   Exception: A time clock or automatic time switch controls shall not be required for spaces where any of the following conditions exist:
   1. A time clock is not required by Section C403.2.4.3 of the International Energy Conservation Code.
   2. There is 24-hour occupancy materials with special atmospheric requirements dependent on 24-hour space conditioning.
   3. A majority of the areas of the building served by the system are under setback thermostat control.
   4. Manufacturer's specifications stipulate that the system must not be shut off.
2. Functional outside air economizers shall be provided on all cooling systems of more than 4¹/₂ tons total cooling capability, 54,000 Btu/h, or more than 1800 cfm (9.144 m³/s @ m²) air flow, provided manufacturer's guidelines are available for adding the economizer to the existing system.
   Exception: An outside air economizer shall not be required for buildings or special uses where 100 percent outside air for ventilation is required or where any of the following conditions exist:

   1. Section C403.3.1 of the International Energy Conservation Code would not require an economizer.
   2. The existing system has a water-based economizer.
   3. The existing system does not have an outside air intake.
   4. Special economizer operations such as, but not limited to, carefully controlled humidity would require more energy use than is conserved.
   5. There is insufficient space to install necessary equipment.
   6. Installation of an economizer would require major modifications to the building's life safety system.
   7. The existing system is a multi-zone system where the same intake air is used at the same time for either heating or cooling in different parts of the building.
3. HVAC piping and ducts, including those located above suspended ceilings, shall comply with Sections 606.3 and 606.4.
   
   Exception: Additional insulation shall not be required for piping where any of the following conditions exist:
   1. Additional insulation shall not be required for piping where any of the following conditions exist:
      1. It is located within HVAC equipment;
      2. It is located within conditioned space that conveys fluids between 60°F (15.6°C) and 105°F (40.6°C);
      3. Piping that is already insulated and the insulation is in good condition; or
   2. Where HVAC ducts and piping are installed in a building cavity or interstitial framing space of insufficient width to accommodate the duct or pipe and the insulation required by Section 606.3 and Table 606.4, the insulation thickness shall be permitted to have the maximum thickness that the wall can accommodate, but shall not be less than ¹/₂-inch (12.7 mm) thick.
4. Where central heat is intended to be replaced with individual electric space heaters, the application for the electrical permit shall include documentation demonstrating that the new electric heaters will not consume more energy than the existing nonelectric heaters.
5. Boiler systems shall have been cleaned and tuned within one year prior to the alteration. Boilers shall be equipped with an outdoor air lock-out thermostat or a temperature reset control.
6. Chillers shall be equipped with an outdoor air lockout thermostat and chilled water reset control.
7. A maximum 5-year phase out plan shall be provided for buildings with existing systems that use CFC-based refrigerants.
8. 8. Where mechanical and electrical systems and equipment are joined with microprocessors that communicate with each other or to a computer, a properly integrated building automation system shall be installed to optimize energy, operations, and indoor comfort. The building automation system shall:
   1. Allow the owner to set up schedules of operation for the equipment and provide equipment optimal start with adaptive learning;
   2. Provide trim and respond capabilities based on zone demand;
   3. Offer the ability to monitor energy usage, including the ability to meter electric, gas, water, steam, hot water, chilled water, and fuel oil services;
   4. Offer economizing based on enthalpy calculation and/or CO₂ set point control;
   5. Offer load shedding when power companies are at peak demand and need; and
   6. Offer the ability to send alarms to alert building owner, manager, or operator when problems occur due to system failures.

Service water systems and equipment shall be in accordance with the following:

1. Water heater and hot water storage tanks shall have a combined minimum total of external and internal insulation value of R-16.
2. Accessible hot and cold water supply and distribution pipes shall comply with Section 607.6. The insulation shall not be required to extend beyond the building thermal envelope.
3. Circulating pump systems for hot water supply purposes other than comfort heating shall be controlled as specified in Section 607.7.
4. Showerhead, toilet, urinal and faucet flow rates shall be in accordance with this code.

Lighting systems and equipment shall be in accordance with sections C405.2.2.3 and C405.2.4 of the International Energy Conservation Code.

Swimming pools and spas and their equipment shall be in accordance with the following:

1. Heated swimming pools and spas shall be equipped with a cover listed and labeled in accordance with ASTM F 1346, or a liquid pool cover feed system, for unoccupied hours.
   Exception: A cover shall not be required for indoor pools or spas in which water temperature is less than 80°F (26.7°C) during time of nonuse.
2. Backwash systems shall be based on pressure drop and shall not be based on a timer.
3. Pool and spa recirculation pumps shall be under timeclock control.
   Exception: Filtration pumps where the public health standard requires 24-hour pump operation.
4. Heaters shall have been cleaned and tuned for efficiency within one year prior to the alteration. Where this has not been done, the heaters shall be cleaned and tuned as part of the alteration work.

In buildings with three or fewer stories above grade plane, ceiling insulation with a minimum R-value as required by this code shall be installed in accessible attic spaces that are directly above conditioned spaces. For the purposes of this section, accessible attic space is the space between ceiling joists and roof rafters where the vertical clear height from the top of a ceiling joist or the bottom chord of a truss, to the underside of the roof sheathing at the roof ridge, is greater than 24 inches (610 mm). Where the required R-value insulation cannot fit in the attic space, the maximum amount of insulation compatible with available space and existing uses shall be installed.

For roof replacement on an existing building with insulation entirely above the deck and where the roof slope is less than two units vertical in 12 units horizontal (16-percent slope), the insulation shall conform to the energy conservation requirements for insulation entirely above deck in the International Energy Conservation Code.