2.9
REFRIGERANT PIPING AND ACCESSORIES
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NOTE: Include and edit this paragraph when
refrigerant piping is not included in other project
specifications.
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Provide accessories as specified in [FS OO-A-373] [FS OO-A-374] [FS
A-A-50502] and this section. Provide suction line accumulators as
recommended by equipment manufacturer's installation instructions. [Provide
a filter-drier in the liquid line.]
2.9.1
Factory Charged Tubing
Provide extra soft, deoxidized, bright annealed copper tubing conforming to
ASTM B 280, factory dehydrated and furnished with a balanced charge of
refrigerant recommended by manufacturer of equipment being connected.
Factory insulate suction line tubing with 9.52 mm 3/8 inchminimum thickness
of closed cell, foamed plastic conforming to ASTM C 534 with a permeance
rating not to exceed 1.0. Provide quick-connectors with caps or plugs to
protect couplings. Include couplings for suction and liquid line
connections of the indoor and outdoor sections.
2.9.2
Field-Assembled Refrigerant Piping
Material and dimensional requirements for field-assembled refrigerant
piping, valves, fittings, and accessories shall conform to ASHRAE 15 and
ASME B31.5, except as herein specified. Factory clean, dehydrate, and seal
piping before delivery to the project location. Provide seamless copper
tubing, hard drawn, Type K or L, conforming to ASTM B 88M ASTM B 88, except
that tubing with outside diameters of 6.35 mm 1/4 inch and 9.52 mm 3/8 inch
shall have nominal wall thickness of not less than 7.62 mm 0.030 inch and
0.81 mm 0.032 inch, respectively. Soft annealed copper tubing conforming
to ASTM B 280 may be used where flare connections to equipment are required
only in nominal sizes less than one inch outside diameter.
2.9.3
Fittings
ASME B16.22 for solder-joint fittings.
UL 109 for flared tube fittings.
2.9.4
Brazing Filler Material
AWS A5.8.
2.9.5
Pipe Hangers and Supports
MSS SP-69 and MSS SP-58, Type [_____], except as indicated otherwise.
2.9.6
Pipe Sleeves
Provide sleeves where piping passes through walls, floors, roofs, and
partitions. Secure sleeves in proper position and location during
construction. Provide sleeves of sufficient length to pass through entire
thickness of walls, floors, roofs, and partitions. Provide not less than
6.35 mm 0.25 inch space between exterior of piping or pipe insulation and
interior of sleeve. Firmly pack space with insulation and caulk at both
ends of the sleeve with plastic waterproof cement which will dry to a firm
SECTION 15730N
Page 24
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