And, x is the sample mean; n is the number of samples; and xi is the ith sample; or,
And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.95 is the t statistic for a 95% one-tailed confidence interval with n-1 degrees of freedom (from Appendix A to subpart B of part 429). And,
And, x is the sample mean; n is the number of samples; and xi is the ith sample; or,
And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.95 is the t statistic for a 95% one-tailed confidence interval with n-1 degrees of freedom (from Appendix A to subpart B of part 429).
Table 1 to Paragraph (a)(3)(i)(A)
Component | Description |
Furnaces and Steam/Hydronic Heat Coils | Furnaces and steam/hydronic heat coils used to provide primary or supplementary heating. |
Ducted Condenser Fans | A condenser fan/motor assembly designed for optional external ducting of condenser air that provides greater pressure rise and has a higher rated motor horsepower than the condenser fan provided as a standard component with the equipment. |
Sound Traps/Sound Attenuators | An assembly of structures through which the supply air passes before leaving the equipment or through which the return air from the building passes immediately after entering the equipment, for which the sound insertion loss is at least 6 dB for the 125 Hz octave band frequency range. |
VERS Preheat | Electric resistance, hydronic, or steam heating coils used for preheating outdoor air entering a VERS. |
Table 2 Paragraph (a)(3)(i)(B)-Rounding Requirements for Rated Moisture Removal Capacity
Moisture removal capacity (MRC), lb/hr | Rounding multiples, lb/hr |
0 [LESS THAN] MRC [LESS THAN EQUAL TO] 30 | 0.2 |
30 [LESS THAN] MRC [LESS THAN EQUAL TO] 60 | 0.5 |
60 [LESS THAN] MRC [LESS THAN EQUAL TO] 180 | 1 |
180 [LESS THAN] MRC | 2 |
Table 3 to Paragraph (a)(3)(ii)(B)(2)-Specific Components for Variable Refrigerant Flow Multi-Split Systems
Component | Description |
Air economizers | An automatic system that enables a cooling system to supply and use outdoor air to reduce or eliminate the need for mechanical cooling during mild or cold weather. |
Dehumidification Components | An assembly that reduced the moisture content of the supply air through moisture transfer with solid or liquid desiccants. |
Table 4 to Paragraph (a)(3)(iii)(A)-Specific Components for Single Package Vertical Units
Component | Description |
Desiccant Dehumidification Components | An assembly that reduces the moisture content of the supply air through moisture transfer with solid or liquid desiccants. |
Air Economizers | An automatic system that enables a cooling system to supply outdoor air to reduce or eliminate the need for mechanical cooling during mid or cold weather. |
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. |
Steam/Hydronic Heat Coils | Coils used to provide supplemental heating. |
Hot Gas Reheat | 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. |
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. |
Powered Exhaust/Powered Return Air Fans | A powered exhaust fan is a fan that transfers 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. A powered return fan is a fan that draws building air into the equipment. |
Sound Traps/Sound Attenuators | An assembly of structures through which the supply air passes before leaving the equipment or through which the return air from the building passes immediately after entering the equipment for which the sound insertion loss is at least 6 dB for the 125 Hz octave band frequency range. |
Hot Gas Bypass | A method to adjust the cooling delivered by the equipment in which some portion of the hot high-pressure refrigerant from the discharge of the compressor(s) is diverted from its normal flow to the outdoor coil and is instead allowed to enter the indoor coil to modulate the capacity of a refrigeration circuit or to prevent evaporator coil freezing. |
Table 5 to Paragraph (a)(3)(iv)(A)-Specific Components for Computer Room Air Conditioners
Component | Description |
Air Economizers | An automatic system that enables a cooling system to supply and use outdoor air to reduce or eliminate the need for mechanical cooling during mild or cold weather. |
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. |
Evaporative Pre-cooling of Air-cooled Condenser Intake Air | Water is evaporated into the air entering the air-cooled condenser to lower the dry-bulb temperature and thereby increase efficiency of the refrigeration cycle. |
Steam/Hydronic Heat Coils | Coils used to provide supplemental heat. |
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. |
Powered Exhaust/Powered Return Air Fans | A powered exhaust fan is a fan that transfers 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. A powered return air fan is a fan that draws building air into the equipment. |
Compressor Variable Frequency Drive (VFD) | A device connected electrically between the equipment's power supply connection and the compressor that can vary the frequency of power supplied to the compressor in order to allow variation of the compressor's rotational speed. If the manufacturer chooses to make representations for performance at part-load and/or low-ambient conditions, compressor VFDs must be treated consistently for all cooling capacity tests for the basic model (i.e., if the compressor VFD is installed and active for the part-load and/or low-ambient tests, it must also be installed and active for the NSenCOP test). |
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. |
Non-Standard Indoor Fan Motors | The standard indoor fan motor is the motor specified in the manufacturer's installation instructions for testing and shall be distributed in commerce as part of a particular model. A non-standard motor is an indoor fan motor that is not the standard indoor fan motor and that is distributed in commerce as part of an individual model within the same basic model. |
For a non-standard indoor fan motor(s) to be considered a specific component for a basic model (and thus subject to the provisions of paragraph (a)(3)(iv)(A) of this section), the following provisions must be met: | |
1. Non-standard indoor fan motor(s) must meet the minimum allowable efficiency determined per section D.2.1 of AHRI 1360-2022 (incorporated by reference, see § 429.4 ) (i.e., for non-standard indoor fan motors) or per section D.2.2 of AHRI 1360-2022 for non-standard indoor integrated fan and motor combinations). | |
If the standard indoor fan motor can vary fan speed through control system adjustment of motor speed, all non-standard indoor fan motors must also allow speed control (including with the use of VFD). | |
Humidifiers | A device placed in the supply air stream for moisture evaporation and distribution. The device may require building steam or water, hot water, electricity, or gas to operate. |
Flooded Condenser Head Pressure Controls | An assembly, including a receiver and head pressure control valve, used to allow for unit operation at lower outdoor ambient temperatures than the standard operating control system. |
Chilled Water Dual Cooling Coils | A secondary chilled water coil added in the indoor air stream for use as the primary or secondary cooling circuit in conjunction with a separate chiller. |
Condensate Pump | A device used to pump condensate and/or humidifier drain water from inside the unit to a customer drain outside the unit. |
Table 6 to Paragraph (a)(3)(v)(A) -Specific Components for Water Source Heat Pumps
Component | Description |
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. |
Condenser Pumps/Valves/Fittings | Additional components in the water circuit for water control or filtering. |
Condenser Water Reheat | A heat exchanger located downstream of the indoor coil that heats the supply air during cooling operation using water from the condenser coil in order to increase the ratio of moisture removal to cooling capacity provided by the equipment. |
Desiccant Dehumidification Components | An assembly that reduces the moisture content of the supply air through moisture transfer with solid or liquid desiccants. |
Desuperheater | A heat exchanger located downstream of the compressor on the high-pressure vapor line that moves heat to an external source, such as potable water. |
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. |
Grill Options | Special grills used to direct airflow in unique applications (such as up and away from a rear wall). |
Indirect/Direct Evaporative Cooling of Ventilation Air | Water is used indirectly or directly to cool ventilation air. In a direct system the water is introduced directly into the ventilation air and in an indirect system the water is evaporated in secondary air stream and the heat is removed through a heat exchanger. |
Non-Standard High-Static Indoor Fan Motors | The standard indoor fan motor is the motor specified in the manufacturer's installation instructions for testing and shall be distributed in commerce as part of a particular model. A non-standard high-static motor is an indoor fan motor that is not the standard indoor fan motor and that is distributed in commerce as part of an individual model within the same basic model. For a non-standard high-static indoor fan motor(s) to be considered a specific component for a basic model (and thus subject to the provisions of paragraph (a)(3)(v)(A)(2) of this section), the following 2 provisions must be met: |
1. Non-standard high-static indoor fan motor(s) must meet the minimum allowable efficiency determined per section D.4.1 of AHRI 600-2023 (incorporated by reference, see § 429.4 ) for non-standard high-static indoor fan motors, or per section D.4.2 of AHRI 600-2023 for non-standard high-static indoor integrated fan and motor combinations. | |
2. If the standard indoor fan motor can vary fan speed through control system adjustment of motor speed, all non-standard high-static indoor fan motors must also allow speed control (including with the use of a variable-frequency drive). | |
Powered Exhaust/Powered Return Air Fans | A powered exhaust fan is a fan that transfers 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. A powered return fan is a fan that draws building air into the equipment. |
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. |
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. |
Sound Traps/Sound Attenuators | An assembly of structures through which the supply air passes before leaving the equipment or through which the return air from the building passes immediately after entering the equipment for which the sound insertion loss is at least 6 dB for the 125 Hz octave band frequency range. |
Steam/Hydronic Heat Coils | Coils used to provide supplemental heating. |
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. |
Waterside Economizer | A heat exchanger located upstream of the indoor coil that conditions the supply air when system water loop conditions are favorable so as not to utilize compressor operation. |
Table 7 to Paragraph ( a )(3)( vi )(A)-Specific Components for Commercial Package Air Conditioning and Heating Equipment
[Excluding air-cooled equipment with a cooling capacity of less than 65,000 Btu/h]
Component | Description |
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. |
Desiccant Dehumidification Components | An assembly that reduces the moisture content of the supply air through moisture transfer with solid or liquid desiccants. |
Evaporative Pre-cooling of Air-cooled Condenser Intake Air | Water is evaporated into the air entering the air-cooled condenser to lower the dry-bulb temperature and thereby increase efficiency of the refrigeration cycle. |
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. |
Indirect/Direct Evaporative Cooling of Ventilation Air | Water is used indirectly or directly to cool ventilation air. In a direct system, the water is introduced directly into the ventilation air, and in an indirect system, the water is evaporated in secondary air stream, and the heat is removed through a heat exchanger. |
Non-Standard Ducted Condenser Fans (not applicable to Double-duct Systems) | A higher-static condenser fan/motor assembly designed for external ducting of condenser air that provides greater pressure rise and has a higher rated motor horsepower than the condenser fan provided as a standard component with the equipment. |
Non-Standard High-Static Indoor Fan Motors | The standard indoor fan motor is the motor specified in the manufacturer's installation instructions for testing and shall be distributed in commerce as part of a particular model. A non-standard motor is an indoor fan motor that is not the standard indoor fan motor and that is distributed in commerce as part of an individual model within the same basic model. |
For a non-standard high-static indoor fan motor(s) to be considered a specific component for a basic model (and thus subject to the provisions of paragraph (a)(3)(vi)(A)(2) of this section), the following provisions must be met: | |
(1) Non-standard high-static indoor fan motor(s) must meet the minimum allowable efficiency determined per section D.3.1 of AHRI 1340-2023 (incorporated by reference, see § 429.4 ) for non-standard high-static indoor fan motors or per section D.3.2 of AHRI 1340-2023 for non-standard high-static indoor integrated fan and motor combinations. | |
(2) If the standard indoor fan motor can vary fan speed through control system adjustment of motor speed, all non-standard high-static indoor fan motors must also allow speed control (including with the use of variable-frequency drive). | |
Powered Exhaust/Powered Return Air Fans | A powered exhaust fan is a fan that transfers 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. A powered return fan is a fan that draws building air into the equipment. |
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. |
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. |
Sound Traps/Sound Attenuators | An assembly of structures through which the supply air passes before leaving the equipment or through which the return air from the building passes immediately after entering the equipment for which the sound insertion loss is at least 6 dB for the 125 Hz octave band frequency range. |
Steam/Hydronic Heat Coils | Coils used to provide supplemental heating. |
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. |
10 C.F.R. §429.43