246681-YTG-B-0607
26 Unitary Products Group
GUIDE SPECIFICATIONS
Prepared for the guidance of architects, consulting engi-
neers, and mechanical contractors.
GENERAL
Furnish and install _____________ mechanical cooling sys-
tem, complete with a Unitized Energy Recovery Ventilator
(UERV).
APPROVALS
The Unitized Energy Recovery Ventilator will contain an
energy recovery component rated in accordance with ARI
Standard 1060-2000 with ratings certified by ARI.
Cabinet
UERV shall be designed to attach directly to the a/c (rooftop,
upflow, horizontal) unit. It shall be G90 galvanized material
with a powdered enamel paint finish electrostatically bonded
to the metal. Cabinet panels where conditioned air is handled
shall be fully insulated to prevent sweating and minimize
sound. Openings shall be provided for power connections.
Lifting devices will be provided for rigging. Test ports shall be
provided so airflow can be measured across the energy
recovery wheel.
Intake Air Blower (direct drive)
UERV shall contain a centrifugal blower. All UERV's will be
equipped with direct drive PSC blower motors. The motor will
be multiple speed and will be individually controlled. Airflow
will also be adjustable by means of a damper on the intake air
opening. Blowers and motors will be removable through
means of a connecting plug for ease of servicing.
Intake Air Blower (belt drive)
UERV shall contain a centrifugal blower. It shall have ball
bearings and adjustable belt drive. Motor mount base shall
permit ease of motor changeover and belt tension adjust-
ment. On pivoting wheel models, supply blower will be de-
energized during economizer operation. (Except for VR074
and VR122.)
Exhaust Air Blower (direct drive)
UERV shall contain a centrifugal blower. All UERV's will be
equipped with direct drive PSC blower motors. The motor will
be multiple speed and shall be individually controlled. Blow-
ers and motors will be removable through means of a con-
necting plug for ease of servicing. On pivoting wheel models,
blower shall be sized to provide power exhaust during econo-
mizer operation.
Exhaust Air Blower (belt drive)
UERV shall contain a centrifugal blower. It shall have ball
bearings and adjustable belt drive. Motor mount base shall
permit ease of motor changeover and belt tension adjust-
ment. On pivoting wheel models, exhaust blowers shall be
sized to provide power exhaust during economizer operation.
Where single blowers cannot provide adequate exhaust, two
blowers will be utilized. One blower is energized during
energy recovery mode, and both blowers are energized dur-
ing economizer mode.
Energy Recovery Wheel
The energy recovery device shall be a rotary heat exchanger
per ARI Standard 1060 description. The device will be an
enthalpy wheel coated with a silica gel desiccant by a pat-
ented process without the use of binders or adhesives which
may plug the desiccant aperture. The substrate shall be a
lightweight polymer. Desiccant shall not dissolve or deli-
quesce in the presence of water or high humidity. The wheel
shall be easily cleanable with standard coil cleaning solution.
On UERV's Series 20 and less, the wheel will easily be
removable from the cabinet for cleaning. On UERV's Series
28 and above, the wheel will be provided with removable seg-
ments for cleaning and maintenance. All diameter and perim-
eter seals shall be provided. The energy recovery cassette
shall be Underwriters Laboratories Recognized Component
for electrical and fire safety.
Balancing Dampers
Balancing dampers will be provided for all VR UERV’s. These
dampers will be mounted inside the rooftop air conditioning
unit to adjust for the amount of exhaust air on packaged units.
On pivoting wheel models, the unit economizer becomes the
balancing damper. Upflow and horizontal ERVs' will have the
balancing damper provided in the ERV. Optional on VO and
VS UERV’s when connected to rooftop units. (Except for
VR074 and VR122.)
Barometric Relief Dampers
Barometric relief dampers will be provided in the exhaust air
hood to prevent air infiltration when the UERV is de-ener-
gized.
ERV Support
All UERV's will be provided with support legs attached to the
cabinet to support the intake and exhaust end of the ERV
unit. Horizontal ERV's will be provided with support brackets
for hanging.
Filters
All units shall be provided with mist eliminator type filters in
the intake air hood.
Power Connection
The UERV shall be provided with a single point power con-
nection for high voltage.
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