in ARI 440. For other exclusions, see ARI 430. In
the industry, the provision of heating and cooling
sections may be added by being rated separately,
with coils per ARI 410, electric heaters per UL
1096, or gas-fired heaters per AGA Z21.47.
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2.2.8.1
Coils
Provide removable coils per ARI 410 with access to both sides. Enclose
[heating] [and] [cooling] coils in a common or individual casing with
headers and return bends [exposed outside] [fully contained within] casing.
[Cooling coils shall have drain pans with piping connections to remove
condensate.] Seal coils to casing to prevent leakage of air around coils.
[Provide face and bypass dampers to regulate the proportions of conditioned
and unconditioned air delivered.]
2.2.8.2
Heaters
[Electric heaters per UL 1096. Elements shall be [nickel chromium alloy]
[_____] [manufacturer's standard]. Heater elements shall cover at least 70
percent of air outlet area to minimize bypass air and reduce surface
temperature.] [Gas-fired heater per ANSI Z21.47 with American Gas
Association (AGA) label. Construct heat exchanger of minimum 16 gage
series 300 or 400 stainless steel. Provide electric ignition type burners.]
2.2.8.3
Eliminators
Equip each cooling coil having an air velocity of over 2 m/s 400 fpm
through the net face area with moisture eliminators, unless the coil
manufacturer guarantees, over the signature of a responsible company
official, that no moisture will be carried beyond the drip pans under
actual conditions of operation. Construct of minimum 24 gage [zinc-coated
steel] [copper] [copper nickel] [or] [stainless steel], removable through
the nearest access door in the casing or ductwork. Eliminators shall have
not less than two bends at 45 degrees and shall be spaced not more than 63
mm 2 1/2 inches center-to-center on face. Each bend shall have an
integrally formed hook as indicated in the SMACNA HVAC Duct Const Stds.
2.2.8.4
Drip Pans
Provide each cooling coil section in both field-and-factory assembled
casings with a stainless or galvanized steel drip pan not less than 18 gage
with drain connections. Drip pans shall collect, confine, and dispose of
all condensate from cooling coils and attachments, including headers,
return bends, distributors, and uninsulated pipe and fittings. Where
individual eliminator blades are in section (not in one piece from top to
bottom of coil bank), provide auxiliary drip troughs at bottom of each
section with drains to drip pans. Insulate drip pans with water impervious
insulation of sufficient thickness to prevent condensate formation on the
exterior at ambient conditions to be encountered.
2.2.9
Sprayed Coil Dehumidifiers
Provide assembly with reinforced, braced, and externally insulated
galvanized steel casing, vertical in-line spray pump, bronze self-cleaning
spray nozzles, galvanized steel pipe spray headers. adjustable float valve
with replaceable neoprene seat, manufacturer's standard cooling coil, and
welded black steel drain tank. Provide overflow drain, make-up, and bleed
SECTION 15720N
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