UL 207:2014 pdf download – Refrigerant-Containing Components and Accessories,Nonelectrical.
4 Materials
4.1 The matenal used in the fabricahon and assembly of a component, such as the desiccant in a drer,
shall be compatible with the type of refrigerant and oil used.
4.2 Copper or brass materials shall not be used In the fabrication or assembly of a component intended
to handle ammonia as a refrigerant.
4.3 Magnesium alloys shall not be used In the fabrication or assembly of a component intended to handle any chiorotluorocarbon (CFC. such as R-11. R-12 or R-502) or hydrochiorotluorocarbon (HCFC. such as R-22 or R-123) refrigerants.
43 revised July 12. 2013
4.4 Aluminum, zinc, or magne&um alloys shall not be used in the fabrication or assembly of a component intended to handle methyl chloride refrigerant.
4.5 All pressure retaining components shall be of corrosion-resisting materials or shall be protected against external corrosion.
4.6 With reference to 4,5. components shall be constructed of corrosion-resistant material, such as copper, or shall be plated. dipped, coated. or otherwise treated to resist external corrosion. Generally, a coating of water-resistant paint is adequate for protection against external corrosion for iron or steel components. Aluminum may be used where the material is not subject to galvanic corrosion.
4.7 Tubing connections, including fittings, of dissimilar metals, such as aluminum and copper, shall be protected against moisture to minimize galvanic action.
4.8 A component made of drawn or machined brass and containing more than 15 percent zinc shall be capable of withstanding, without cradcing, a Moist Ammonia Air Stress Cracking Test, See Section 1 8A.
4.8 revised June 13, 2014
5 Refrigerant Tubing
5.1 Unless subjected to the tests specified in Sections 12 or 14, copper or steel tubing provided to interconnect components shall have a wall thickness not less than indicated in Table 5,1.
5.1 revised July 12.2013
5.1.1 Components constructed of continuous tubing or of lengths of tubing having telescoped oints shall either:
a) Comply with the minimum thickness requirements of Table 5.1 and not exceed 1-112 inches (38 mm) outside diameter; or
b) Be tested in accordance with Sechons 12 or 14.
5.6 Tubing connections shall be made by means of flare.type fittings with steel or forged brass nuts, by soldering or brazing. or by equivalent means. The dimensions of flare-type fillings shall conform to the Standard for Refrigeration Tube Fittings, SAE J51 31.
5.7 JoInts on copper tubing used on components for use with Group 2 or 3 refrigerant, as classified in the Safely Code for Mechanical Refrigeration, ASHRAE 15, shall be brazed joints, See 3.4.9 and Table 11,1.
5.8 Tubing forming part of components such as evaporators or condensers, where protection is afforded by inherent construction, shall be judged by the Strength Test requirements of this standard.
6 General
6,1 The parts of a refrigerant-containing component subjected to refngerant pressure shall withstand without failure the pressure indicated in the Performance Section of this standard.
6.2 Heat exchangers intended for the connection of a potable water system shall be of double wall construction and be marked as specified in 23.2.
Added 6.2 effective June 4,2015
6.3 Heat exchangers with other than double wall (e.g., single-wall construction) shall not be intended for connection to a potable water system. The heater exchanger shall be marked as specified in 23.3.
Added 6.3 effective June 4, 2015
6,4 A vented Interface provided In a heat exchanger shall have continuity to enable water to exit the vented interface when tested in accordance with 12.4.1(a).
Added 6.4 effective June 4,2015
6.5 A vented interface provided in a heat exchanger shall have sufficient strength to withstand, without leaking, not less than 1-1/2 times the maximum rated design pressure for the highest pressure refrigerant intended for use in either side of the heat exchanger when tested In accordance with 12.4.1(b).
Added 6.5 effective June 4, 2015
7 Pressure Vessels
7.1 Pressure vessels over 6 inches (152 mm) inside diameter with a design pressure greater than 15 psig (103 kPa) shalt be designed, tested, and stamped in accordance with the AmerIcan Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code. Section VIII, for a design pressure in comiance with the Performance Section of this standard. The manufacturer shall submit evidence of compliance of these vessels with the ASME Boiler and Pressure Vessel Code, Section VIII.