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1. Unit cabinet shall be constructed of galvanized stee l, and shall be bonderized and coated with a pre--painted
baked enamel finish on all externally exposed surfaces.
2. Unit cabinet exterior paint shall be: film thickness, (dry) 0.003 inches minimum, gloss (per ASTM D523,
60_F/16_C): 60, Hardness: H--2H Pencil hardne ss.
3. Evaporator fan compartment interior cabinet i nsulation shall conform to ARI Standards 210 or 360 m inimum
exterior sweat criteria. Interior surfaces shall be insulated with a minimum 1/2--in. thick, 1 lb density, flexible
fiberglass insulation, neoprene coated on the air side. Aluminum foil --faced fiberglass insulation shall be used
in the gas heat compartment.
4. Base of unit shall have a minimum of four locations for thru--the--base gas and electrical connections (factory
installed or field installed), standard.
5. Base Rail
a. Unit shall have base rails on a minimum of 2 sides.
b. Holes shall be provided in the base rails for rigging shackles to facilitate maneuvering and overhead rig-
ging.
c. Holes shall be provided i n the base rail for moving the rooftop by fork truck.
d. Base rail shall be a minimum of 16 gauge thickness.
6. Condensate pan and connections:
a. Shall be a sloped c ondensate drain pan made of a non--corrosive material.
b. Shall c omply with ASHRAE Standard 62.
c. Shall use a 3/4” --14 NPT drain connection, possible either through the bottom or side of the drain pan.
Connect ion shall be made per manufacturer’s recommendat ions.
7. Top panel:
a. Shall be a single piece top panel.
8. N/A
9. Electrical Connections
a. All uni t power wiring shall enter unit cabinet at a single, factory--prepared, knockout location.
b. Thru--the--base capability
i. Standard unit shall have a thru--the--base electrical location(s) using a raised, embossed portion of the
unit basepan.
ii. Optional, factory--approved, water--tight connection method must be used for thru--the--base electric al
connec tions.
iii. No basepan penetration, other than those authorized by the manufacturer, is permitted.
10. Component access panels (standard)
a. Cabinet panel s shall be easily removable for servicing.
b. Unit shall have one factory installed, tool--less, removable, filter access panel.
c. Panels covering control box, indoor fan, indoor fan motor, gas components (where applicabl e), and com-
pressors shall have a molded composite handles.
d. Handles shall be UV modified, composite. They shall be permanently attached, and recessed into the pan-
el.
e. Screws on the vertical portion of all removable access panel shall engage into heat resistant, molded com-
posite collars.
f. Collars shall be removable and easily replaceable using manufacturer recommended parts.
23 81 19.13.I. N/A
23 81 19.13.J. Coils
1. Standard Alum inum/Copper Coils:
a. Standard evaporator and condenser coils shall have aluminum lanced plat e fins mechanically bonded to
seamless internally grooved copper tubes with all joints brazed.
b. Evaporator and condenser coils shall be leak tested to 150 psig, pressure tested to 400 psig, and qualified to
UL 1995 burst test at 2,200 psi.
2. Optional Pre--coated aluminum--fin coils:
a. Shall have a durable epoxy-- phenolic coating to provide protection in mildly corrosive coastal environ-
ments.
b. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert
barrier between the a luminum fin a nd copper tube.
c. Epoxy--phenolic barrier shall minimize galvanic action between dissimilar metals.
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