thick aluminum on units with a capacity above 70 kW 20 tons and 1.0 mm (20
gauge) 20 gauge galvanized steel or 1.6 mm 0.064 inch thick aluminum on
units with a capacity less than 70 kW 20 tons. Casing shall be fitted with
lifting provisions, access panels or doors, fan vibration isolators,
electrical control panel, corrosion-resistant components, structural
support members, insulated condensate drip pan and drain, and internal
insulation in the cold section of the casing. Where double-wall insulated
construction is proposed, minimum exterior galvanized sheet metal thickness
shall be 1.0 mm (20 gauge) 20 gauge. Provisions to permit replacement of
major unit components shall be incorporated. Penetrations of cabinet
surfaces, including the floor, shall be sealed. Unit shall be fitted with
a drain pan which extends under all areas where water may accumulate.
Drain pan shall be fabricated from Type 300 stainless steel, galvanized
steel with protective coating as required, or an approved plastic material.
Pan insulation shall be water impervious. Extent and effectiveness of the
insulation of unit air containment surfaces shall prevent, within limits of
the specified insulation, heat transfer between the unit exterior and
ambient air, heat transfer between the two conditioned air streams, and
condensation on surfaces. Insulation shall conform to ASTM C 1071. Paint
and finishes shall comply with the requirements specified in paragraph
FACTORY COATING.
2.10.9.1
Indoor Cabinet
Indoor cabinets shall be suitable for the specified indoor service and
enclose all unit components.
2.10.9.2
Outdoor Cabinet
Outdoor cabinets shall be suitable for outdoor service with a weathertight,
insulated and corrosion-protected structure. Cabinets constructed
exclusively for indoor service which have been modified for outdoor service
are not acceptable.
2.11
ACCESSORIES
2.11.1
Dry-Cooler, Glycol Solution
Unit shall be factory fabricated and tested, packaged, self-contained,
complete with casing, propeller or centrifugal type fans, heat rejection
coils, appurtenances, and intercomponent piping and wiring. Unit shall be
certified by the manufacturer or an independent test laboratory that the
unit's ratings meet ARI 410 the indicated conditions. Unit shall be
designed for [outdoor] [indoor] installation and comply with the
requirements of UL 1995. Unit shall compatible with the solution specified
in paragraph "Glycol Solution". Unit shall be fitted with [duplex]
recirculating pump, expansion tank, [black steel] [Type L copper] [schedule
80 PVC] intercomponent piping, system accessories and controls. Factory
assembled piping shall be Type L copper. Cabinet construction shall be in
accordance with paragraph "Unitary Equipment Components".
2.11.1.1
Coil
**************************************************************************
NOTE: Delete the copper or aluminum tubes and the
0.076 mm (3 mil) coating except in corrosive
environments.
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SECTION 15700A
Page 42
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