ASHRAE-90.1-2022- - Page 139

Extracted Content

7. SERVICE WATER HEATING

7.1 General 7.1.1 Service Water-Heating Scope. Section 7 specifies requirements for service water-heating systems and equipment.

7.1.2 New Buildings. Service water-heating systems and equipment shall comply with the requirements of Section 7.2.

7.1.3 Additions to Existing Buildings. Service water-heating systems and equipment shall comply with the requirements of Section 7.2.

Exception to 7.1.3: When the service water heating to an addition is provided by existing service

water-heating systems and equipment, such 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 .

7.1.4 Alterations to Service Water-Heating Systems and Equipment. Building service water heating equipment installed as a direct replacement for existing building service water heating equipment shall comply with the requirements of Section 7 applicable to the equipment being replaced. New and replacement piping shall comply with Section 7.4.3.

Exception to 7.1.4: Compliance shall not be required where there is insufficient space or access to meet

these requirements.

7.2 Compliance Paths. Service water heating systems and equipment shall comply with Sections 7.2.1 and 7.2.2. 7.2.1 Requirements for All Compliance Paths. Service water heating systems and equipment shall comply with Sections 7.1, “General”; 7.4, “Mandatory Provisions”; 7.7, “Submittals”; and 7.8, “Product Information.”

7.2.2 Additional Requirements to Comply with Section 7. Service water heating systems and equip- ment shall comply with Section 7.5, “Prescriptive Compliance Path.”

7.3 Simplified Building Compliance Path (Not Used)

7.4 Mandatory Provisions 7.4.1 Load Calculations. Service water heating system design loads for the purpose of sizing systems and equipment shall be determined in accordance with the manufacturer ’s published sizing guidelines or

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 137