energized. Coil casing and support brackets shall be of galvanized steel
or aluminum. Coil shall be mounted to eliminate noise from expansion and
contraction and be completely accessible for service.
2.10.3.4
Gas-Fired Heating Section
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NOTE: Gas-fired heating sections are not available
for air-conditioning units for EDP spaces.
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Gas-fired heat exchanger shall be constructed of aluminized steel, ceramic
coated cold-rolled steel or stainless steel suitable for [natural gas]
[liquid propane gas] fuel supply. Burner shall have direct spark or hot
surface ignition. Valve shall include a pressure regulator. Combustion
air shall be supplied with a centrifugal combustion air blower. Safety
controls shall include a flame sensor and air pressure switch. Heater
section shall be mounted to eliminate noise from expansion and contraction
and shall be completely accessible for service. Gas equipment shall bear
the AGA label for the type of service involved. Burner shall be in
accordance with NFPA 54.
2.10.4
Air Filters
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NOTE: References to inapplicable filter types will
be deleted.
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Air filters shall be listed in accordance with requirements of UL 900,
except high efficiency particulate air filters of 99.97 percent efficiency
by the DOP Test Method shall be as listed under the label service and shall
meet the requirements of UL 586.
2.10.4.1
Extended Surface Pleated Panel Filters
Filters shall be 50 mm 2 inch depth sectional type of the size indicated
and shall have an average efficiency of 25 to 30 percent when tested in
accordance with ASHRAE 52.1. Initial resistance at 2.54 m/s 500 feet/minute
will not exceed 90 Pa 0.36 inches water gauge. Filters shall be UL Class
2. Media shall be nonwoven cotton and synthetic fiber mat. A wire support
grid bonded to the media shall be attached to a moisture resistant
fiberboard frame. Four edges of the filter media shall be bonded to the
inside of the frame to prevent air bypass and increase rigidity.
2.10.4.2
Replaceable Media Filters
Replaceable media filters shall be the [dry-media] [viscous adhesive] type,
of the size required to suit the application. Filtering media shall be not
less than 50 mm 2 inches thick fibrous glass media pad supported by a
structural wire grid or woven wire mesh. Pad shall be enclosed in a
holding frame of not less than 1.6 mm (16 gauge) 16 gauge galvanized steel,
and equipped with quick-opening mechanism for changing filter media. The
air flow capacity of the filter shall be based on net filter face velocity
not exceeding [1.52] [_____] m/s [300] [_____] feet/minute, with initial
resistance of [32] [_____] Pa [0.13] [_____] inches water gauge. Average
efficiency shall be not less than [_____] percent when tested in accordance
with ASHRAE 52.1.
SECTION 15700A
Page 39
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