size of condensate drain pans for air handling units
where abnormally high latent loads will be
encountered such as high humidity locations or units
operating with 100 percent outside air. Where the
potential exists for a manufacturer's standard
condensate pan to be smaller than the size
calculated, include the size required in the
equipment schedule on the drawings.
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2.8.1
Field-Fabricated Air Handling Units
Built-up units shall be as specified in paragraph DUCT SYSTEMS. Fans,
coils spray-coil dehumidifiers, and air filters shall be as specified in
paragraph AIR SYSTEMS EQUIPMENT for types indicated.
2.8.2
Factory-Fabricated Air Handling Units
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NOTE: Coordinate with paragraph Fans and paragraph
Coils.
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Units shall be [single-zone draw-through type] [or] [single-zone
blow-through type] [or] [multizone blow-through type] [blow-through
double-deck type] [blow-through triple deck type] as indicated. Units
shall include fans, coils, airtight insulated casing, [prefilters,]
[secondary filter sections,] [and] [diffuser sections where indicated,]
[air blender] adjustable V-belt drives, belt guards for externally mounted
motors, access sections where indicated, [mixing box] [combination
sectional filter-mixing box,] [[pan] [drysteam] [spray type] humidifier,]
vibration-isolators, and appurtenances required for specified operation.
Vibration isolators shall be as indicated. Each air handling unit shall
have physical dimensions suitable to fit space allotted to the unit and
shall have the capacity indicated. Air handling unit shall be rated in
accordance with ARI 430 and ARI certified for cooling.
2.8.2.1
Casings
Casing sections shall be [[single] [50 mm 2 inch double] wall type] [as
indicated,] constructed of a minimum 1.3 mm 18 gauge galvanized steel, or
1.3 mm 18 gauge steel outer casing protected with a corrosion resistant
paint finish according to paragraph FACTORY PAINTING. [Inner casing of
double-wall units shall be minimum one mm 20 gauge solid galvanized steel.]
Design and construct casing with an integral insulated structural steel
frame such that exterior panels are non-load bearing. Exterior panels
shall be individually removable. Removal shall not affect the structural
integrity of the unit. Furnish casings with inspection doors, access
sections, and access doors as indicated. Inspection and access doors shall
be insulated, fully gasketed, double-wall type, of a minimum 1.3 mm 18 gauge
outer and one mm 20 gauge inner panels. Doors shall be rigid and provided
with heavy duty hinges and latches. Inspection doors shall be a minimum
300 mm 12 inches wide by 300 mm 12 inches high. Access doors shall be
minimum 600 mm 24 inches wide and shall be the full height of the unit
casing or a minimum of 1800 mm 6 foot, whichever is less. [A minimum 200
by 200 mm 8 by 8 inches sealed glass window suitable for the intended
application shall be installed in all access doors.] Access Sections shall
be according to paragraph AIR HANDLING UNITS. Drain pan shall be
double-wall insulated type constructed of 1.4 mm 16 gauge [galvanized
SECTION 15895
Page 39
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