2.18
CONTROL TUBING AND WIRING
Provide HVAC control tubing and wiring.
2.18.1
Tube and Fittings
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NOTE: Systems that are critical and required for
smoke removal operation shall have tubing of
noncombustible material only.
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2.18.1.1
Copper Tubing
ASTM B 75MASTM B 75 or ASTM B 88M ASTM B 88. Tubing 10 mm 0.375 inch
outside diameter and larger shall have a minimum wall thickness equal to
ASTM B 88M ASTM B 88, Type M. Tubing less than 10 mm 0.375 inch outside
diameter shall have a minimum wall thickness of 0.64 mm 0.025 inch.
Concealed tubing shall be hard or soft copper; multiple tubing shall be
racked or bundled. Exposed tubing shall be hard copper; rack multiple
tubing. Tubing for working pressures greater than 206 kPa (gage)30 psig
shall be hard copper. Bundled tubing shall have each tube numbered each 2.0
meterssix feet minimum. Racked and individual tubes shall be permanently
identified at each end. Fittings shall be solder type ANSI B16.18 or ASME
B16.22, using ASTM B 32, Plumbing Code approved lead-free solder, or
compression type ASME B16.26.
2.18.1.2
Polyethylene Tubing
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NOTE: If the building has crawl spaces or ceilings
with openings to the outside, such as vent louvers,
prohibit use of bare polyethylene tubing in these
areas.
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Polyethylene tubing shall be provided only for systems with working
pressure of 206 kPa (gage)30 psig or less. Provide flame-resistant,
multiple polyethylene tubing in flame-resistant protective sheath with
Mylar barrier, or unsheathed flame-resistant polyethylene tubing in rigid
metal, intermediate metal, or electrical metallic tubing conduit for areas
where tubing is exposed. Single, unsheathed, flame-resistant polyethylene
tubing may be used where concealed in walls or above ceilings and within
control panels, except prohibited in crawl spaces, attics, and
above-ceiling spaces that are vented to the outdoors. Do not provide
polyethylene tubing for [systems indicated as critical and] smoke removal
systems. Number each tube in sheathing each two feet minimum. Permanently
identify unsheathed tubing at each end. Provide compression or barbed
push-on type fittings. Extruded seamless polyethylene tubing shall conform
to the following:
a.
Minimum burst pressure requirements: 690 kPa (gage) at 24 degrees
C to 172 kPa (gage) at 66 degrees C 100 psig at 75 degrees F to 25
psig at 150 degrees F.
b.
Stress crack resistance:
ASTM D 1693, 200 hours minimum.
c.
Tensile strength (minimum):
ASTM D 638M, ASTM D 638, 7583 kPa
SECTION 15901N
Page 41
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