Fans which force air through coils into computer room[s] shall have belt
drives and adjustable sheaves sized to ensure achievement of design air
flow by field adjustments. Fan system design shall be such that design air
flow shall be achieved at the midpoint of sheave adjustment.
The supply air fan shall be AMCA certified, double-inlet/double-width, and
equipped with forward-curved blades wheel. The supply air fan shall be
statically and dynamically balanced and equipped with V-belt drive. The
fan shall have self-aligning, permanently lubricated ball bearings with a
minimum life span of 100,000 hours.
Provide [V-belt drive][dual V-belt drive] sized for 200 percent of the
motor nameplate rating. Fan speed shall be adjustable with cast iron
variable pitch pulleys. Sheaves shall be within the middle one third of
the sheave adjustment range.
The fan motor shall be drip-proof with NEMA rated frame, inherent overload
protection, and sliding adjustable motor base. The maximum vibrations
shall not exceed 2 mils (0.05 mm) in any plane.
2.1.3
Cooling Coil
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NOTE: Indicate on the design drawings the minimum
required head for the coil condensate pump.
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Provide ARI 410 coils and slope for drainage. Coil shall be constructed of
seamless copper tubes with plate aluminum fins. Each coil, in the
production process, shall be individually tested at 2200 kPa 320 psi with
compressed air under water and verified to be air tight. [Provide DX coil
complete with a distributor and thermostatic expansion valve with external
equalizer.] [Provide hydronic coils complete with drain and vent
connections.] [Provide condensate drain pan of stainless steel
construction with nonferrous connections and internal trap, and a
condensate pump system complete with integral pump discharge check valve,
integral float switch, reservoir, and pump and motor assembly.]
2.1.4
Filters
Provide UL listed[2] [4] [_____] inches [50] [100] [_____] mm thick deep
pleated fiberglass throwaway type filters. [Additionally, provide [2]
[_____] inches [50][_____] mm thick deep pleated fiberglass throwaway type
pre-filters.] Efficiency of filter bank shall be a minimum of [30
percent][__ percent] efficiency based on ASHRAE 52.1 requirements. Provide
one complete spare filter bank set for installation prior to final
acceptance testing covered in Part 3 of this section.
2.1.5
Reheat Coil
[Provide ARI 410 reheat coils and slope for drainage. Provide coil
constructed of seamless copper tubes with plate aluminum fins. Each coil,
in the production process, shall be individually tested at 2200 kPa 320 psi
with compressed air under water and verified to be air tight.]
[Provide electric reheat coils with low watts density. The electric reheat
coils shall be enclosed in 304 stainless steel tubes and 304 stainless
steel fins. Provide modulating control of the electric reheat coils by
SECTION 15702N
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