403 - BUILDING MECHANICAL SYSTEMS

C403.5 Economizers (Prescriptive) - Deleted TABLE C403.4.4 VARIABLE SPEED DRIVE (VSD) REQUIREMENTS FOR DEMAND-CONTROLLED PUMPS CHILLED WATER AND HEAT REJECTION LOOP VSD REQUIRED FOR MOTORS PUMPS IN THESE CLIMATE ZONES WITH RATED OUTPUT OF: 1A, 1B, 2B ≥2 hp C403.7 Ventilation and exhaust systems. C403.7.1 Demand control ventilation (Mandatory). Demand control ventilation (DCV) shall be provided for spaces larger than 500 square feet (46.5 m2) and with an average occupant load of 25 people or greater per 1,000 square feet (93 m2) of floor area, as established in Table 403.3.1.1 of the Puerto Rico Mechanical Code, and served by systems with one or more of the followings: C403.7.2 Enclosed parking garage ventilation controls (Mandatory). Exceptions: 1. Garages with a total exhaust capacity less than 22,500 cfm (10 620 L / s) with ventilation systems that do not utilize heating or mechanical cooling. 2. Garages that have a garage area to ventilation system motor nameplate power ratio that exceeds 1125 cfm/hp (710 L / s/kW) and do not utilize heating or mechanical cooling. C403.7.3 Ventilation air heating control (Mandatory). Units that provide ventilation air to multiple zones and operate in conjunction with zone heating and cooling systems shall not use heating or heat recovery to warm supply air to a temperature greater than 60°F (16°C) when representative building loads or outdoor air temperatures indicate that the majority of zones require cooling. C403.7.4 Energy recovery ventilation systems (Mandatory). Where the supply airflow rate of a fan system exceeds the values specified in Tables C403.7.4(1) and C403.7.4(2), the system shall include an energy recovery system. The energy recovery system shall be configured to provide a change in the enthalpy of the outdoor air supply of not less than 50 percent of the difference between the outdoor air and return air enthalpies, at design conditions. Exception: An energy recovery ventilation system shall not be required in any of the following conditions: 1. Where energy recovery systems are prohibited by the Puerto Rico Mechanical Code. 2. Laboratory fume hood systems that include not fewer than one of the following features: 785 2.1. Variable-air-volume hood exhaust and room supply systems configured to reduce exhaust and makeup air volume to 50 percent or less of design values. 2.2. Direct makeup (auxiliary) air supply equal to or greater than 75 percent of the exhaust rate, heated not warmer than 2°F (1.1°C) above room setpoint, cooled to not cooler than 3°F (1.7°C) below room setpoint, with no humidification added, and no simultaneous heating and cooling used for dehumidification control. Systems serving spaces that are heated to less than 60°F (15.5°C) and that are not cooled. 4. Where more than 60 percent of the outdoor heating energy is provided from siterecovered or site-solar energy. TABLE C403.7.4(1) ENERGY RECOVERY REQUIREMENT (Ventilation systems operating less than 8,000 hours per year) PERCENT (%) OUTDOOR AIR AT FULL DESIGN AIRFLOW RATE ≥ 10% ≥ 20% ≥ 30% ≥40% ≥ 50% ≥ 60% ≥ 70% and and and and and and and < > 80% CLIMATE ZONE < 20% < 30% < 40% < 50% < 60% < 70% 80% DESIGN SUPPLY FAN AIRFLOW RATE (cfm) 1A, ≥ 26,000 ≥ 16,000 ≥ 5,500 ≥ 4,500 ≥ 3,500 ≥ 2,000 ≥ 1,000 > 120 TABLE C403.7.4(2) ENERGY RECOVERY REQUIREMENT (Ventilation systems operating not less than 8,000 hours per year) PERCENT (%) OUTDOOR AIR AT FULL DESIGN AIRFLOW RATE ≥ 10% ≥ 20% ≥ 30% >40% ≥ 50% ≥ 60% ≥ 70% CLIMATE ZONE and and and and and and and < > 80% < 20% < 30% < 40% < 50% < 60% < 70% 80% DESIGN SUPPLY FAN AIRFLOW RATE (cfm) 1A, ≥ 2,500 ≥ 2,000 ≥ 1.000 ≥ 500 ≥ 140 ≥ 120 ≥ 100 > 80 C403.7.5 Kitchen exhaust systems (Mandatory). Replacement air introduced directly into the exhaust hood cavity shall not be greater than 80 percent of the hood exhaust airflow rate. Conditioned supply air delivered to any space shall not exceed the greater of the following: 1. The ventilation rate required to meet the space heating or cooling load. C403.7.6.1 Temperature setpoint controls. Controls shall be provided on each HVAC system that are capable of and configured to automatically raise the cooling setpoint and lower the heating setpoint by not less than 4°F (2°C) from the occupant setpoint within 30 minutes after the occupants have left the guestroom. The controls shall be capable of and configured to automatically raise the cooling setpoint to not lower than 80°F (27°C) and lower the heating setpoint to not higher than 60°F (16°C) when the guestroom is unrented 786 or has not been continuously occupied for more than 16 hours or a networked guestroom control system indicates that the guestroom is unrented, and the guestroom is unoccupied for more than 30 minutes. A networked guestroom control system that is capable of returning the thermostat set-points to default occupied set-points 60 minutes prior to the time a guestroom is scheduled to be occupied is not precluded by this section. Cooling that is capable of limiting relative humidity with a setpoint not lower than 65-percent relative humidity during unoccupied periods is not precluded by this section. C403.11.1 Duct and plenum insulation and sealing (Mandatory). Supply and return air ducts and plenums shall be insulated with not less than R-6 insulation where located in unconditioned spaces and where located outside the building with not less than R-8 insulation in Climate Zone 1 Where located within a building envelope assembly, the duct or plenum shall be separated from the building exterior or unconditioned or exempt spaces by not less than R-8 insulation in Climate Zone 1 C403.12 Mechanical systems located outside of the building thermal envelope (Mandatory). C403.12.2 Snow- and ice-melt system controls. - Deleted C403.12.3 Freeze protection system controls. - Deleted SECTION C406 - ADDITIONAL EFFICIENCY PACKAGE OPTIONS C406.10 Environmental Luminaries. Any luminary or sign on building with illumination shall be replaced with full-cutoff lamps and shall comply with the Reglamento para el Control y la Prevención de la Contaminación Lumínica issued by the Puerto Rico Environmental Quality Board. CHAPTER 5 [CE] - EXISTING BUILDINGS