F-F-320C
in storage when subjected to temperatures up to 210 degrees Fahrenheit (99 degrees Celsius) and
shall by UL-listed as specified in 3.3. The media roll shall be not less than 65 feet (19.81 m) long.
The filter section shall include:
a.
A drive assembly with motor overload protection.
b.
An adjustable timer control.
c.
A media runout switch.
d.
An indicating light.
e.
A spring-loaded pressure plate to ensure recompression as the media rewinds.
f.
A full roll of clean media.
3.9.3 Extended media-type filters. Type III, style D filters shall be of the stationary, multiple-
pocket, replaceable cartridge type held in place by corrosion-resistant holding frames. The media
shall be glass or acrylic fibers or a combination thereof and shall be dry or adhesive coated in
accordance with the manufacturer's standard practice. An initial supply of filter cartridges shall
be furnished with filter units. The ratio of total media area to face area shall be not less than 35 to
1 for class 1, standard efficiency filters and 20 to 1 for class 2, high efficiency filters.
3.10 Wash system controls. Type I and type II units shall be equipped with one of the following
wash control systems, as specified (see 6.2):
a. Manual.
b. Semiautomatic.
c. Automatic.
3.10.1 Manual. For manual controls, the system fan and unit power pack(s) shall be deenergized
by the operator. The water supply control valve shall then be manually opened and the drive
motor for traveling manifolds manually energized. The washing cycle shall continue until it is
manually terminated. Adhesive application on type I units and detergent dispensing on type II
units shall also be accomplished by manual actuation of the pumps and, when applicable, the
manifold drive.
3.10.2 Semiautomatic. Units with semiautomatic controls shall be equipped with a washwater
solenoid valve, strainer, and control system. The following sequence of operations shall occur
automatically when the control switch is manually actuated:
a. The system fan and power pack(s) shall be deenergized. (The controls shall contain
provisions for interlocking the system fan with the filter unit controls at the site at the time
of installation.)
b. For type II units, the detergent pump and, when applicable, drive motor for moving
manifolds, shall be energized for a timed detergent application period followed by a timed
soaking period.
c. The washwater solenoid valve shall then open and the drive motors for washwater
manifolds on type I units shall be energized.
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