Appendix C1 to Subpart F of Part 431 - —Uniform Test Method for Measuring the Energy Consumption of Water-Source Heat Pumps

Appendix C1 to Subpart F of Part 431—XXX

Cross Reference

Link to an amendment published at

431—Uniform Test Method for Measuring the Energy Consumption of Water-Source Heat Pumps

Note:

Prior to the compliance date of amended standards for water-source heat pumps that rely on integrated energy efficiency ratio (IEER) and applied coefficient of performance (ACOP) published after January 1, 2023, representations with respect to the energy use or energy efficiency of water-source heat pumps, including compliance certifications, must be based on testing according to appendix C of this subpart.

Starting on November 29, 2024, voluntary representations with respect to the IEER and ACOP of water-source heat pumps must be based on testing according to this appendix. Manufacturers may also use this appendix to make voluntary representations with respect to IEER and ACOP prior to November 29, 2024.

Starting on the compliance date for any amended energy conservation standards for water-source heat pumps based on IEER and ACOP, any representations, including compliance certifications, made with respect to the energy use or energy efficiency of water-source heat pumps must be based on testing according to this appendix.

Manufacturers may also certify compliance with any amended energy conservation standards for water-source heat pumps based on IEER and ACOP prior to the applicable compliance date for those standards, and those compliance certifications must be based on testing according to this appendix.

1. Incorporation by Reference

DOE incorporated by reference in § 431.95 the entire standards for AHRI 600–2023, ANSI/ASHRAE 37–2009 (as corrected by the Errata sheet for ANSI/ASHRAE 37–2009), and Melinder 2010. However, certain enumerated provisions of AHRI 600–2023 and ASHRAE 37–2009, as listed in this section 1, are inapplicable.

To the extent there is a conflict between the terms or provisions of a referenced industry standard and the CFR, the CFR provisions control.

1.1. AHRI 600–2023

(a) Section 1 Purpose is inapplicable,

(b) Section 2 Scope is inapplicable,

(c) The following subsections of section 3 Definitions are inapplicable:

(1) 3.2.1 (Air Economizer),

(2) 3.2.3 (Barometric Relief Dampers),

(3) 3.2.4 (Basic Model),

(4) 3.2.5 (Coated Coils),

(5) 3.2.6 (Coefficients of Performance),

(6) 3.2.9 (Condenser Pump/Valves/Fittings),

(7) 3.2.10 (Condenser Water Reheat),

(8) 3.2.13 (Desiccant Dehumidification Components),

(9) 3.2.14 (Desuperheater),

(10) 3.2.15.1 (Energy Efficiency Ratio),

(11) 3.2.16 (Evaporative Cooling of Ventilation Air),

(12) 3.2.17 (Fire/Smoke/Isolation Dampers),

(13) 3.2.19 (Fresh Air Dampers),

(14) 3.2.21 (Grill Options),

(15) 3.2.23 (High-effectiveness Indoor Air Filtration),

(16) 3.2.24 (Hot Gas Bypass),

(17) 3.2.27 (Integrated Energy Efficiency Ratio),

(18) 3.2.28 (Low-static Heat Pump),

(19) 3.2.35 (Power Correction Capacitors),

(20) 3.2.36 (Powered Exhaust Air Fan),

(21) 3.2.37 (Powered Return Air Fan),

(22) 3.2.38 (Process Heat Recovery/Reclaim Coils/Thermal Storage),

(23) 3.2.40 (Published Rating),

(24) 3.2.42 (Refrigerant Reheat Coils),

(25) 3.2.43 (Single Package Heat Pumps),

(26) 3.2.44 (Sound Traps/Sound Attenuators),

(27) 3.2.45 (Split System Heat Pump),

(28) 3.2.51 (Steam/Hydronic Heat Coils),

(29) 3.2.53 (UV Lights),

(30) 3.2.54 (Ventilation Energy Recovery System),

(31) 3.2.55 (Water/Brine to Air Heat Pump Equipment), and

(32) 3.2.56 (Waterside Economizer),

(d) The following subsections of section 6 Rating Requirements are inapplicable:

(1) 6.5 (Residential Cooling Capacity and Efficiency),

(2) 6.6 (Residential Heating Capacity and Efficiency),

(3) 6.7 (Test Data vs Computer Simulation),

(4) 6.8 (Rounding and Precision),

(5) 6.9 (Uncertainty), and

(6) 6.10 (Verification Testing),

(e) Section 7 Minimum Data Requirements for Published Ratings is inapplicable

(f) Section 8 Operating Requirements is inapplicable,

(g) Section 9 Marking and Nameplate Data is inapplicable,

(h) Section 10 Conformance Conditions is inapplicable,

(i) Appendix B References—Informative is inapplicable,

(j) Sections D.1 (Purpose), D.2 (Configuration Requirements), and D.3 (Optional System Features) of Appendix D Unit Configuration For Standard Efficiency Determination—Normative are inapplicable, and

(k) Appendix F Example of Determination of Fan and Motor Efficiency for Non-standard Integrated Indoor Fan and Motors—Informative is inapplicable.

1.2. ANSI/ASHRAE 37–2009 (Even if Corrected by the Errata Sheet)

(a) Section 1 Purpose is inapplicable.

(b) Section 2 Scope is inapplicable.

(c) Section 4 Classification is inapplicable.

2. General

Determine integrated energy efficiency ratio (IEER) and heating applied coefficient of performance (ACOP) in accordance with this appendix and the applicable sections of AHRI 600–2023, ANSI/ASHRAE 37–2009, and Melinder 2010. Representations of AEER, EER, and COP may optionally be made.

Section 3 of this appendix provides additional instructions for testing. In cases where there is a conflict, the language of this appendix takes highest precedence, followed by AHRI 600–2023, followed by ANSI/ASHRAE 37–2009. Any subsequent amendment to a referenced document by the standard-setting organization will not affect the test procedure in this appendix, unless and until the test procedure is amended by DOE. Material is incorporated as it exists on the date of the approval, and a notification of any change in the incorporation must be published in the Federal Register.

3. Setup and Test Provisions for Specific Components

When testing a water-source heat pump that includes any of the features listed in table 1 to this appendix, test in accordance with the setup and test provisions specified in table 1 to this appendix.

Table 1 to Appendix C1—Setup and Test Provisions for Specific Components

Component	Description	Setup and test provisions
Air Economizers	An automatic system that enables a cooling system to supply outdoor air to reduce or eliminate the need for mechanical cooling during mild or cold weather	For any air economizer that is factory-installed, place the economizer in the 100 percent return position and close and seal the outside air dampers for testing. For any modular air economizer shipped with the unit but not factory-installed, do not install the economizer for testing.
Barometric Relief Dampers	An assembly with dampers and means to automatically set the damper position in a closed position and one or more open positions to allow venting directly to the outside a portion of the building air that is returning to the unit, rather than allowing it to recirculate to the indoor coil and back to the building	For any barometric relief dampers that are factory-installed, close and seal the dampers for testing. For any modular barometric relief dampers shipped with the unit but not factory-installed, do not install the dampers for testing.
Desiccant Dehumidification Components	An assembly that reduces the moisture content of the supply air through moisture transfer with solid or liquid desiccants	Disable desiccant dehumidification components for testing.
Fire/Smoke/Isolation Dampers	A damper assembly including means to open and close the damper mounted at the supply or return duct opening of the equipment	For any fire/smoke/isolation dampers that are factory-installed, set the dampers in the fully open position for testing. For any modular fire/smoke/isolation dampers shipped with the unit but not factory-installed, do not install the dampers for testing.
Fresh Air Dampers	An assembly with dampers and means to set the damper position in a closed and one open position to allow air to be drawn into the equipment when the indoor fan is operating	For any fresh air dampers that are factory-installed, close and seal the dampers for testing. For any modular fresh air dampers shipped with the unit but not factory-installed, do not install the dampers for testing.
Power Correction Capacitors	A capacitor that increases the power factor measured at the line connection to the equipment	Remove power correction capacitors for testing.
Process Heat recovery/Reclaim Coils/Thermal Storage	A heat exchanger located inside the unit that conditions the equipment's supply air using energy transferred from an external source using a vapor, gas, or liquid	Disconnect the heat exchanger from its heat source for testing.
Refrigerant Reheat Coils	A heat exchanger located downstream of the indoor coil that heats the supply air during cooling operation using high-pressure refrigerant in order to increase the ratio of moisture removal to cooling capacity provided by the equipment	De-activate refrigerant reheat coils for testing so as to provide the minimum (none if possible) reheat achievable by the system controls.
Steam/Hydronic Heat Coils	Coils used to provide supplemental heating	Test with steam/hydronic heat coils in place but providing no heat.
UV Lights	A lighting fixture and lamp mounted so that it shines light on the indoor coil, that emits ultraviolet light to inhibit growth of organisms on the indoor coil surfaces, the condensate drip pan, and/other locations within the equipment	Turn off UV lights for testing.
Ventilation Energy Recovery System (VERS)	An assembly that preconditions outdoor air entering the equipment through direct or indirect thermal and/or moisture exchange with the exhaust air, which is defined as the building air being exhausted to the outside from the equipment	For any VERS that is factory-installed, place the VERS in the 100 percent return position and close and seal the outside air dampers and exhaust air dampers for testing, and do not energize any VERS subcomponents (e.g., energy recovery wheel motors). For any VERS module shipped with the unit but not factory-installed, do not install the VERS for testing.

[88 FR 84230, Dec. 4, 2023

.

]