As several upcoming and recent regulatory changes affect single package and split system light commercial products1, this PMN summarizes existing and pending regulations on products provided by Daikin North America LLC. Regulations summarized include Department of Energy (DOE), ASHRAE 90.1 and California Energy Commission (CEC) Title 24. It should be noted that ASHRAE and CEC regulations include many other application requirements for our products. Therefore, state and local regulations should also be consulted to verify application compliance.

DOE Federal Minimum Product Efficiency Requirements.
Table 1 below summarizes the product minimum efficiencies as federally regulated by the U.S. DOE (note the efficiency metric changes from EER to IEER effective in 2018).

ASHRAE 90.1 Product Efficiency Requirements
Table 2 below summarizes the product minimum efficiencies required by ASHRAE 90.1. Please note there are multiple additional control / thermostat requirements in ASHRAE 90.1 that are not directly part of the HVAC equipment provided by Daikin North America.

Table 2: ASHRAE 90.1 Minimum Product Efficiency
• Additional ASHRAE 90.1-2016 prescriptive requirements6 :
• Economizer is required except [Section 6.5.1]:
– Climate Zones 1A & 1B7
– Applications with very high efficiency systems8
– Certain applications such as hospital and computer rooms meeting special criteria9
– System cooling capacity is less than 54,000 Btu/h
• When an economizer is installed, a Fault Detection and Diagnostics (FDD) system shall be included, as well as other economizer design/control requirements exist. [Sections 6.4.3.12 and 6.5.1.1]
• DX units shall have a minimum of two stages of mechanical cooling capacity. [Section 6.5.1.3.b]
• While providing ventilation air to multiple zones, cannot use heating or heat recovery to warm supply air above 60° F when representative building loads or outdoor air temperature indicate that the majority of zones require cooling. [Section 6.5.2.6]                                                                                                                                                                                                                 • DX units shall have at least two stages of fan control, with low or minimum speed not exceeding 66% of full speed (and shall draw no more than 40% of full speed fan power at low or minimum speed. [Section 6.5.3.2.1]
– Two speeds of fan control shall be capable when an economizer is present.

2016 California Energy Commission (CEC) Title 24 Requirements
Table 3 below summarizes the minimum efficiencies required by CEC Title 2014 2016 version. Please note there are multiple, additional control / thermostat requirements that are not directly part of the HVAC equipment provided by Daikin North America LLC, including but not limited to ventilation requirements in Section 120.1, controls requirements in Section 120.2 and Section 140.4.

Table 3: 2016 CEC Title 24 Minimum Product Efficiency

Additional CEC Title 24 prescriptive requirements (if chosen as a pathway to compliance) include:
• Economizer is required for systems with cooling capacity over 54,000 Btu/h with some exceptions. [Section 140.4(e)]
– When an economizer is installed, a Fault Detection and Diagnostics (FDD) system shall be included. [120.2(i)]
• DX units shall have at least two stages of fan control, with low or minimum speed not exceeding 66% of full speed (and shall draw no more than 40% of full speed fan power at low or minimum speed11. [Section 140.4(m)]
– Two speeds of fan control shall be capable when an economizer is present.

 

 

1 Includes all 3-phase direct expansion (DX) products with capacity less than 300,000 Btu/h, air-cooled products only. VRV not included.
2 EER, IEER, and COP values presented for >=65K BTU units are for air cooled units only, not water cooled or evaporatively cooled units which have different values.
3 Gas heating efficiency is 80% Thermal Efficiency for any equipment with a heating input capacity of greater than or equal to 225,000 Btu/h.                                                                          4 Tables 6.8.1-1 and 6.8.1-2. SEER not IEER and HSPF not COP47 for <65K.

5 Gas heating efficiency is 80% Thermal Efficiency for any equipment with a heating input capacity of greater than or equal to 225,000 Btu/h.
6 As mandated by Section 6.5 Prescriptive Path for products or accessories (if chosen as a pathway to compliance).
7 Zones per ASHRAE 169, effectively very southern tips of Florida and Texas.
8 See Table 6.5.1-2.
9 See “Exceptions to 6.5.1” in ASHRAE Standard 90.1-2016 for details.                                                                                                                                                                                                                10 Gas heating efficiency is 80% Thermal Efficiency for any equipment with a heating input capacity of greater than or equal to 225,000 Btu/h.
11 For units controlling capacity based on space temperature. For units controlling space temperature by airflow modulation, minimum speed airflow is 50% of full speed airflow, minimum speed power shall be no more than 30% of full speed power.