level control panel shall consist of a safety interlock pressure switch,
unit pressure drop indicator, bubbler tube ("type" is indicated above)
supply pneumatics, P/I transducer, I/P transducer, and PID single-loop
controller, all contained in a NEMA 12 enclosure. The level control panel
shall be shipped mounted to the unit.
2.6.18
Conditioner Fan (Liquid Desiccant System)
The unit shall be equipped with a conditioner fan only to the extent
necessary to supply static pressure to existing equipment, or if used as a
stand alone unit, as specified in Section 15895 AIR SUPPLY, DISTRIBUTION,
VENTILATION, AND EXHAUST SYSTEM.
2.6.19
Regeneration Fan (Liquid Desiccant System)
The regeneration fan shall be supplied with a separate field-mounted fan
and assembly rated for the requirements of the regeneration system. The
fan and assembly shall be of such design and construction to be resistant
to the chemicals within the regenerator, as specified in Section 15895 AIR
SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM.
2.7
UNIT CONSTRUCTION
2.7.1
Solid Desiccant System
Unit shall be suitable for outdoor installation. It shall be designed for
either structural or curb mounting without field modification. The
enclosure system shall be air-tight (2% maximum leakage at 150% design
static pressure from section to section). The unit base shall be
constructed of formed minimum 10 GA steel coated with red- oxide primer.
Cross members shall be located to support each major component. Lifting
lugs shall be fitted to appropriate structural members. Unit exterior
shall be painted with a low-gloss enamel.
2.7.1.1
Housing
The unit housing and internal partitions shall be constructed of minimum 18
GA galvanized steel with the exterior panels treated to allow for painting.
All external walls shall be insulated with foil-faced fiber glass
insulation at least 25 mm 1 inch thick and secured by permanent mechanical
fasteners welded to the panels. Adjoining panels shall be sealed by
permanent mechanical fasteners welded to the panels. Adjoining panels
shall be sealed to one another with silicone compound, as specified in
Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS.
2.7.1.2
Service Panels
Removable service access panels shall be provided for all components. The
openings shall be of sufficient size to allow service to all maintenance
items. All service panels shall be provided with resilient gaskets and
hardware to assure compression. Access doors shall be provided for boiler
and control sections and shall have continuous hinges. Roof panels shall
be sealed to provide a weather-tight enclosure.
2.7.2
Liquid Desiccant System
The unit shall consist of conditioner and regenerator watertight housings
containing the sump of vinylester FRP with additives to achieve a U.L.
Class 1 flame spread rating, or equal. The conditioner cooler, and
SECTION 15500A
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