e.
Level control
f.
Filter screening
g.
Freestanding pump assembly
h.
Make up water system
i.
Conditioner fan
j.
Regenerator fan
2.5.2.1
Control Panel
Each unit shall be factory wired and equipped with a central electrical
control panel mounted inside the service compartment. A single power
supply shall be required. All internal wiring shall be in accordance with
the National Electrical Code. All electrical components required for
automatic operation, based on signals from remotely mounted humidity and
temperature sensors/controllers, shall be included. Connections to remote
devices shall be made at the marked terminals. The internal control panel
shall report discharge temperature and humidity. Additional reporting of
all control data shall be available to a central control station, as
specified in Section 15951 DIRECT DIGITAL CONTROL FOR HVAC AND OTHER LOCAL
BUILDING SYSTEMS.
2.5.2.2
Equipment Mounting
Liquid desiccant systems shall have the conditioner and regenerator units
set on level concrete floor or slab. Before the equipment is set in place,
the floor shall be sealed with epoxy sealant. Unit shall be surrounded by
a curb.
2.6
SYSTEM COMPONENTS
2.6.1
Desiccant Rotor
Dehumidifiers shall be non-cyclic adsorption type with a single desiccant
rotary structure designed for continuous operation. Construction
arrangement shall provide counter flow of process and regeneration air
streams with full face pressure seals to prevent cross leakage with static
pressure differentials up to 200 mm 8 inches water gauge. The rotary
structure shall consist of a stable, hygroscopic desiccant material, such
as Silica Gel, Titanium Silicate, or a Zeolite, deposited on a honey-combed
substrate designed to maximize the desiccant area exposed to the air stream
and minimize the thermal carryover from the regeneration side to the
adsorption side. The design shall ensure laminar air flow through the
structure for minimum pressure loss. The rotor shall be complete with an
electric motor with over-current protection and a speed reducer assembly
driving the rotor through a flexible circumferential drive belt. A slack
side belt tensioner shall be included for automatic take-up.
2.6.2
2.6.2.1
Thermal Rotor
The thermal rotor shall be of the rotary, non-hygroscopic type, to minimize
the transfer of water vapor between the process and regeneration sides of
the unit. The rotor shall be constructed and sized to maximize the
transfer of heat from the supply air stream to the regeneration air stream
while minimizing the transfer of moisture back to the supply air stream.
Supply and cooling air streams shall be counter flow and the component
fitted with full face contact seals on both sides to prevent leakage.
SECTION 15500A
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