g.
Indirect Evaporative Cooling System
h.
Gas fired Boiler (optional)
i.
Circulating pumps (boiler, evaporative cooling)
j.
Refrigeration Section (optional) for pre- and/or post-cooling
2.5.1.1
Control Package
Each unit shall be factory wired and equipped with a central electrical
control panel mounted inside the service compartment. Variable-speed drive
controller, if provided, shall also be mounted inside the service
compartment. Switched lighting shall be provided in the service
compartment so that the panel can be easily seen. Compartment shall be
ventilated, if necessary, for cooling variable speed drive controller. 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.
2.5.1.2
Unit Mounting
The unit shall be [curb mounted] [structural steel supported]. The entire
unit shall be isolated from the building structure on vibration isolators
with submitted and published load ratings. Vibration isolators shall have
isolation characteristics as recommended by the manufacturer for the unit
supplied and the service intended.
2.5.2
Liquid Desiccant System
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NOTE: Liquid desiccant systems are capable of
maintaining year round humidity control due to
characteristics of the conditioner solution and the
units ability to maintain the concentration of the
solution. Additionally, these units are capable of
lowering the air temperature because the conditioner
solution passes through a heat exchanger utilizing a
cold liquid such as chilled water. The designer
should work with the manufacturer to integrate these
systems with the existing mechanical units. One
approach would be to use the desiccant system to
precondition supply air for several chiller-AHU
systems.
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The unit shall be a complete, factory assembled and tested, system suitable
for outdoor installation. Each unit shall produce a capacity as rated in
accordance with ARI 210/240. It shall be designed for [curb mounting]
[structural steel support]. The unit shall include the following
components as defined in paragraph SYSTEM COMPONENTS:
a.
Conditioner unit
b.
Conditioner cooler
c.
Regenerator
d.
Regenerator heater
SECTION 15500A
Page 12
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