ASHRAE-90.1-2022- - Page 073
Extracted Content
6. HEATING, VENTILATING, AND AIR CONDITIONING
6.1 General 6.1.1 Scope. Section 6 specifies requirements for mechanical equipment and systems. 6.1.2 New Buildings. Mechanical equipment and systems serving the heating, cooling, ventilating, or refrigeration needs of new buildings shall comply with the requirements of this section as described in Section 6.2.
6.1.3 Additions to Existing Buildings. Mechanical equipment and systems serving the heating, cooling, ventilating, or refrigeration needs of additions to existing buildings shall comply with the requirements of this section as described in Section 6.2.
Exception to 6.1.3: When HVACR to an addition is provided by existing HVACR systems and equip-
ment, such existing systems and equipment shall not be required to comply with this standard. However, any new systems or equipment installed must comply with specific requirements applicable to those systems and equipment .
6.1.4 Alterations to Heating, Ventilating, Air Conditioning, and Refrigeration in Existing Buildings 6.1.4.1 New HVACR equipment as a direct replacement of existing HVACR equipment shall comply with the following sections as applicable for the equipment being replaced:
a. 6.3, “Simplified Approach Building Compliance Path for HVAC Systems” b. 6.4.1, “Equipment Efficiencies, Verification, and Labeling Requirements” c. 6.4.3.1, “Zone Thermostatic Controls” d. 6.4.3.2, “Set-Point Overlap Restrictions” e. 6.4.3.3, “Off-Hour Controls” except for Section 6.4.3.3.4, “Zone Isolation” f. 6.4.3.4, “Ventilation System Controls” g. 6.4.3.7, “Freeze Protection and Snow/Ice Melting Systems” h. 6.4.3.8, “Ventilation Controls for High-Occupancy Areas” only for single-zone equipment i. 6.4.3.9, “Heated or Cooled Vestibules or Air Curtains with Integral Heating” j. 6.4.5, “Walk-In Coolers and Walk-In Freezers” k. 6.5.1.1, “Air Economizers” for units located outdoors l. 6.5.1.3, “Integrated Economizer Control” m. 6.5.1.4, “Economizer Heating System Impact” n. 6.5.3.1.3, “Fan Efficiency”
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 71