For floor furnaces, it is obtained by multiplying (A) the “heat input” (Q in) by (B) the steady-state efficiency divided by 100, minus the quantity (2.8) (L j) divided by 100, where L j is the jacket loss as determined in section 3.2 of this appendix.ġ.16 “Higher heating value” (HHV) means the heat produced per unit of fuel when complete combustion takes place at constant pressure and the products of combustion are cooled to the initial temperature of the fuel and air and when the water vapor formed during combustion is condensed. For room and wall heaters, it is obtained by multiplying the “heat input” (Q in) by the steady-state efficiency (η ss) divided by 100. It includes any input energy to the pilot light and is obtained by multiplying the measured rate of fuel consumption by the measured higher heating value of the fuel.ġ.15 “Heating capacity” (Q out) means the rate of useful heat output from a vented heater, operating under steady-state conditions, expressed in Btu's per hour. (iii) Sections 37.5.8 through 37.5.180.5 UL 896-2016ġ.1 “Active mode” means the condition during the heating season in which the vented heater is connected to the power source, and either the burner or any electrical auxiliary is activated.ġ.2 “Air shutter” means an adjustable device for varying the size of the primary air inlet(s) to the combustion chamber power burner.ġ.3 “Air tube” means a tube which carries combustion air from the burner fan to the burner nozzle for combustion.ġ.4 “Barometic draft regulator or barometric damper” means a mechanical device designed to maintain a constant draft in a vented heater.ġ.5 “Condensing vented heater” means a vented heater that, during the laboratory tests prescribed in this appendix, condenses part of the water vapor in the flue gases.ġ.6 “Draft hood” means an external device which performs the same function as an integral draft diverter, as defined in section 1.17 of this appendix.ġ.7 “Electro-mechanical stack damper” means a type of stack damper which is operated by electrical and/or mechanical means.ġ.8 “Excess air” means air which passes through the combustion chamber and the vented heater flues in excess of that which is theoretically required for complete combustion.ġ.9 “Flue” means a conduit between the flue outlet of a vented heater and the integral draft diverter, draft hood, barometric damper or vent terminal through which the flue gases pass prior to the point of draft relief.ġ.10 “Flue damper” means a device installed between the furnace and the integral draft diverter, draft hood, barometric draft regulator, or vent terminal which is not equipped with a draft control device, designed to open the venting system when the appliance is in operation and to close the venting system when the appliance is in a standby condition.ġ.11 “Flue gases” means reaction products resulting from the combustion of a fuel with the oxygen of the air, including the inerts and any excess air.ġ.12 “Flue losses” means the sum of sensible and latent heat losses above room temperature of the flue gases leaving a vented heater.ġ.13 “Flue outlet” means the opening provided in a vented heater for the exhaust of the flue gases from the combustion chamber.ġ.14 “Heat input” (Q in) means the rate of energy supplied in a fuel to a vented heater operating under steady-state conditions, expressed in Btu's per hour.
(v) Section 9.10 - Optional Test Procedures for Condensing Furnaces and Boilers that Have no OFF-Period Flue Losses (iv) Section 8.8.3 - Additional Optional Method of Testing for Determining DP and DF for Furnaces and Boilers (iii) Section 8.6 - Jacket Loss Measurement (iv) Section 11.7 - Temperature at discharge air opening and surface temperatures
However, only enumerated provisions of ANSI Z21.86-2016 ASHRAE 103-2017, UL 729-2016, UL 730-2016, and UL 896-2016 are applicable to this appendix, as follows: On and after November 16, 2022, representations with respect to energy use or efficiency of vented home heating equipment, including compliance certifications, must be based on testing conducted in accordance with this appendix.ĭOE incorporated by reference in § 430.3: ANSI Z21.86-2016 ASHRAE 103-2017 ASTM D2156-09 (R2018) IEC 62301 UL 729-2016 UL 730-2016 and UL 896-2016 in their entirety.
Prior to November 16, 2022, representations with respect to the energy use or efficiency of vented home heating equipment, including compliance certifications, must be based on testing conducted in accordance with either this appendix as it now appears or appendix O as it appeared at 10 CFR part 430, subpart B revised as of January 1, 2021.
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