2.6.2
Electrical Accessories
a.
Power supply connection fitting and stainless steel mounting
brackets. Provide stainless steel worm gear clamp to fasten
bracket to pipe.
b.
13 mm 0.5 inch wide fiberglass reinforced pressure sensitive cloth
tape to fasten cable to pipe at 305 mm 12 inch intervals.
c.
Pipe surface temperature control thermostat shall be cast
aluminum, NEMA 4 (watertight) enclosure, 15 mm 0.5 inch NPT
conduit hub, SPST switch rated 20 amperes at 480 volts ac, with
capillary and copper bulb sensor. Set thermostat to maintain pipe
surface temperature at not less than 1.1 degrees C 34 degrees F.
d.
Signs shall be manufacturer's standard (NEC), stamped "ELECTRIC
TRACED" located on the insulation jacket at 3 mm 10 feet intervals
along the pipe on alternating sides.
2.7
ACCESS DOORS FOR VALVES
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NOTE: Indicate on the design drawings the locations
of access doors for valves.
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Provide factory fabricated and primed flush face steel access doors
including steel door frame equipped with continuous hinges and
turn-screw-operated latch. Provide door frame installation in plaster and
masonry walls.
2.8
AUXILIARY DRAIN PAN, DRAIN CONNECTIONS, AND DRAIN LINES
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NOTE: Indicate on the design drawings the locations
of access doors for valves.
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Provide galvanized steel auxiliary drain pans under units where indicated.
Provide separate drain lines for the unit drain and auxiliary drain pans.
Trap drain pans from the bottom to ensure complete pan drainage. Provide
drain lines full size of drain opening. Traps and piping to drainage
disposal points shall conform to Section 15400 PLUMBING SYSTEMS.
2.9
ANTIFREEZE PROTECTION
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NOTE: Antifreeze solutions may be necessary in
colder climates where the temperature of the ground
heat exchanger fluid falls below the freezing point
of water.
**************************************************************************
Provide [ethylene glycol] [acetate potassium] [propylene glycol] antifreeze
solution which meets local and State requirements and is acceptable to heat
pump component manufacturers. The antifreeze shall be used in closed-loop
ground source heat pump systems for the transfer of energy to provide
heating and cooling. The fluid shall contain the necessary corrosion
inhibitors to protect pipe and equipment from attack by the antifreeze
solution utilized.
SECTION 15741N
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