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F1925 (2010 08) Page 4 of 5
• Exhaust Air Damper - Built in with positive closed position.
Provides exhaust air capability to prevent pressurization of tight
buildings.
• Actuator Motor - 24 volt, power open, spring return with built in
torque limiting switch.
• Proportioning Type Control - for maximum “free cooling” economy
and comfort.
• Moisture Eliminator & Prefilter - permanent, washable aluminum
construction.
• Enthalpy Control - adjustable to monitor outdoor temperature and
humidity.
• Minimum Position Potentiometer - adjustable to control minimum
damper blade position for ventilation purposes.
• Mixed Air Sensor - to monitor outside and return air to
automatically modulate damper position.
4.3 COMMERCIAL ROOM VENTILATOR OPTIONAL
The built-in commercial room ventilator is internally mounted and
allows outside ventilation air, up to 50% of the total air flow rating of
the unit, to be introduced through the air inlet openings. It includes
a built-in exhaust air damper. The damper can be easily adjusted to
control the amount of fresh air supplied into the building. Automatic
control shall be provided to maintain desired ventilation rate during
the different supply airflows of fan only, Stage 1 and Stage 2 modes
of operation. The CRV can be controlled by indoor blower operation
or field controlled based on room occupancy using CO2 controller.
Unit complies with ANSI/ASHRAE Standard 62.1 Ventilation for
Acceptable Air Quality.
4.4 ENERGY RECOVERY VENTILATOR OPTIONAL
The Energy Recovery Ventilator (ERV) shall consist of 1 or 2 rotary
wheels in an insulated cassette frame with seals, drive motor and
belt. The ERV assembly shall also include intake and exhaust
blowers. The entire assembly shall easily slide in or out of the
ventilation section, allowing for maintenance or replacement. The
total energy wheel shall be coated with silica gel desiccant,
permanently bonded without the use of binders or adhesives. The
coated segments shall be washable with detergent or alkaline coil
cleaner and water. Desiccant shall not dissolve or deliquesce in the
presence of water or high humidity. All diameter and perimeter seals
shall be provided as part of the cassette assembly and shall be
factory set. Drive belts shall not require external tensioners or
adjustment. Cassette wheels shall include rims to prevent belts from
slipping off wheels. Intake and exhaust blowers shall have
selections of high, medium or low speed and selected independently,
to allow for positive pressurization if desired. The ERV cassette