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Table 13-1: Main categories of safety standards and impact of HAT Requirement Classification (occupancies, systems, location, refrigerant) Quantities of refrigerant per occupied space Space volume calculations Requirements for mechanical components and piping - General requirements - Specific requirements for particular components - Materials - Testing (strength pressure, tightness, functional) - Marking and documentation Requirements for assemblies - General - Design and construction (pressure requirements, piping, fittings, pressure protection devices, sources of ignition, etc.) - Testing (strength pressure, tightness, functional, conformity) - Marking and documentation Location of refrigerating equipment (open air, machinery room, occupied space, ventilated enclosure, etc.) Machinery rooms (ventilation, combustion equipment, lighting, accessibility, storage, emergency switches, openings, etc.) Requirements for alternative provisions (occupied space, ventilation, safety shut-off valves) Electrical installations Safety alarms (general, power, warnings, specific for R717) Detectors (location, function, performance, installation) Instruction manuals, notices, and inspections Requirements for recovery, reuse and disposal, transfer, transport, storage, disposal and documentation Impact of HAT relative to MAT and LAT None Yes - higher heat loads infer more refrigerant None None None None Yes - strength and tightness needs to account for higher anticipated pressure None None Yes - strength needs to account for higher pressure Yes - strength needs to account for higher pressure None None None None None None None None Special machines used for HAT Maintenance and repair including change of refrigerant type Tools and equipment handling units designed for HAT conditions need to be rated for higher temperature and pressure. The only types of requirements for safety standards that are impacted by high ambient temperatures are design/test pressures and refrigerant charge limits. The charge limits have an indirect impact. 262 2018 TOC Refrigeration, A/C and Heat Pumps Assessment ReportPDF Image | Heat Pumps Technical Options
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