including the waterside and refrigerant side of condensers and evaporators
shall be in accordance with ASME BPVC SEC VIII D1, and ASHRAE 15. The
presence of the ASME official Code U-Symbol or Code UM-Symbol stamped or
marked on the vessels, and the submitting of the applicable ASME required
manufacturer's data report will be accepted as evidence that the pressure
vessels comply to the ASME rules for construction. Where referenced
publications do not apply, pressure components shall be tested at 1-1/2
times design working pressure. Refrigerant wetted carbon steel surfaces
shall be pickled or abrasive blasted free of mill scale, cleaned, dried,
charged, and sealed. [Where service temperatures below minus 7 degrees C
20 degrees F are encountered, materials of construction shall be low
temperature alloy carbon steel.] Nozzle length shall be approximately 1/3
greater than insulation thickness. Insulated vessels shall be fitted with
rings and other insulation supports as required for installation of
insulation. Exterior surfaces of vessels which are insulated and vapor
barrier sealed shall be abrasive blasted and primed with 0.076 mm 3 mil dry
film thickness of inorganic zinc rich coating.
1.3.4
Refrigeration Equipment
Include layout drawings and control diagrams of the refrigeration equipment.
1.4
REFRIGERATION PIPING AND ACCESSORIES
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NOTE: Insert appropriate Section number and title
in blank below using format per UFC 1-300-02.
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Provide as specified under [_____].
PART 2
PRODUCTS
2.1
UNIT COOLERS
[Forced circulation] [Free delivery] type, factory fabricated, assembled
and tested, and packaged in accordance with ARI 420.
2.1.1
Construction
Construct casings of Type 300 Series stainless steel, aluminum, mill
galvanized or hot-dip galvanized steel after fabrication. Provide zinc
coated carbon steel with protective coating. Direct or V-belt drive fans
of the propeller or centrifugal type. Statically and dynamically balance
the fan wheels. Coils service shall have copper tubes and aluminum fins.
Provide water-tight, corrosion resistant drain pans. Drain pans and
drainage piping for units in spaces maintained at less than 2 degrees C 35
degrees F shall be insulated and fitted with means for defrosting and
condensate removal.
2.1.2
Defrosting
Defrost units mounted in spaces maintained at 2 degrees C 35 degrees F or
higher with ambient space air. Provide units mounted in spaces maintained
at less than 2 degrees C 35 degrees F with [hot gas] [electric heat]
defrosting system. Control room air defrosting by a timer defrost
controller adjustable for up to 6 defrost cycles per 24 hours, each of 5 to
120 minutes duration. Defrost systems shall be controlled by [timer]
[demand] defrost controller.
SECTION 15602N
Page 9
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