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MANDATORY REQUIREMENTS - (Continued) ❑R402.4.4 Rooms containing fuel-burning appliances. In Climate Zones 3 through where open combustion air ducts provide combustion air to open combustion fuel burning appliances,the appliances and combustion air opening all be located outside the building thermal envelope or enclosed in a room,isolated from inside the thermal envelope.Such rooms shall be s led and insulated in accordance with the envelope requirements of Table R402.1.2,where the walls,floors and ceilings shall meet not less than the ba ement wall R-value requirement.The door into the room shall be fully gasketed and any water Iines.and ducts in the room insulated in accordance with ection R403.The combustion air duct shall be insulated where it passes through conditioned space to a minimum of R-8. Exceptions: 1. Direct vent appliances with both intake and exhaust pipes installe continuous to the outside. 2. Fireplaces and stoves complying with Section R402.4.2 and Secti n R1006 of the Florida Building Code,Residential. ❑R402.4.5 Recessed lighting. Recessed luminaires installed in the building thermal nvelope shall be sealed to limit air leakage between conditioned and.unconditioned spaces.All recessed luminaires shall be IC-rat d and labeled as having an air leakage rate not more than 2.0 cfm(0.944 Us)when tested in accordance with.ASTM E283 at a 1.57 ps (75 Pa)pressure differential.All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior all or ceiling covering. SECTION R403 SYS EMS R403.1 Controls. ❑ R403.1.1 Thermostat provision(Mandatory). At least one thermostat shall be provided for each separate heating and cooling system. ❑ R403.1.3 Heat pump supplementary heat(Mandatory). Heat pumps having s pplementary electric-resistance heat shall have controls that,except during defrost,prevent supplemental heat operation when the heat ump compressor can meet the heating load. ❑ R403.3.2 Sealing(Mandatory) All ducts,air handlers,filter boxes and building cavities that form the primary air containment passageways for air distribution systems shall be considered ducts or plenum chambers,sh II be constructed and sealed in accordance with Section C403.2.9.2 of the Commercial Provisions of this code and shall be shown to m et duct tightness criteria below. Duct tightness shall be verified by testing in accordance with ANSI/RESNET/I C 380 by either individuals as defined in Section 553.993(5)or (7),Florida Statutes,or individuals licensed as set forth in Section 489.105(3)(f,(g)or(i),Florida Statutes,to be"substantially leak free"in accordance with Section R403.3.3. ❑ R403.3.2.1 Sealed air handler. Air handlers shall have a manufacturer's designation for an air leakage of no more than 2 percent of the design airflow rate when tested in accordance with ASHRAE 193. ❑ R403.3.3 Duct testing(Mandatory). Ducts shall be pressure tested to determ no air leakage by one of the following methods: 1, Rough-in test:Total leakage shall be measured with a pressure ifferential of 0.1 inch w.g. (25 Pa)across the system,including the manufacturer's air handler enclosure if installed at the time of th test.All registers shall be taped or otherwise sealed during the test. 2. Postconstruction test:Total leakage shall be measured with a pr ssure differential of 0.1 inch w.g. (25 Pa)across the entire system,including the manufacturer's air handler enclosure Registers shall be taped or otherwise sealed during the test. Exceptions: 1. A duct air leakage test shall not be required where the ducts nd air handlers are located entirely within the building thermal envelope. 2. Duct testing is not mandatory for buildings complying by Sect on 405 of this code. A written report of the results of the test shall be signed by the part conducting the test and provided to the code official. ❑R403.3.5 Building cavities(Mandatory). Building framing cavities shall not be used as ducts or plenums. ❑R403.4.Mechanical system piping insulation(Mandatory). Mechanical system pipi g capable of carrying fluids above 105°F(41°C) or below 55°F(13°C)shall be insulated to a minimum of R-3. ❑ R403.4.1 Protection of piping insulation. Piping insulation exposed to we ther shall be protected from damage,including that caused by sunlight,moisture,equipment maintenance and wind,and shall provi a shielding from solar radiation that can cause degradation of the material..Adhesive tape shall not be permitted. ❑ R403.5.1 Heated water circulation and temperature maintenance.systems( andatory). Heated water circulation systems shall be in accordance with Section R403.5.1.1.Heat trace temperature maintenance syst ms shall be in accordance with Section R403.5.1.2. Automatic controls,temperature sensors and pumps shall be accessible. Manu I controls shall be readily accessible. R403.5.1.1 Circulation.systems. Heated water circulation systems hall be provided with a circulation pump.The system return ❑ pipe shall be a dedicated return pipe or a cold water supply pipe.Grav ty and thermosiphon circulation systems shall be prohibited. Controls for circulating hot water system pumps shall start the pump b sed on the identification of a demand for hot water within the occupancy.The controls shall automatically turn off the pump when th water in the circulation loop is at the desired temperature and when there is no demand for hot water. ❑ R403.5.1.2 Heat trace systems. Electric heat trace systems shall co ply with IEEE 515.1 or UL 515.Controls for such systems shall automatically adjust the energy input to the heat tracing to mainti in the desired water temperature in the piping in accordance with the times when heated water is used in the occupancy. 1 1/5/201 9 1 1:45 AM EnergyGauge@ USA 6.0.02(Rev. 1)-FlaRes2017 FBC 6th Ed tion(2017) Compliant Software Page 2 of 5