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Section 10:
Energy Recovery/Conservation Wheels:
DANGER
ELECTRICAL SHOCK HAZARD
Disconnect electric before service.
More than one disconnect switch
may be required to disconnect
electric from equipment.
Equipment must always be
properly grounded.
SEVERE INJURY HAZARD
Do not enter equipment while in
operation. Equipment may start
automatically. Do not operate with
access doors open. Installation,
operation, and maintenance
must be performed by a trained
technician only.
Failure to follow these instructions can result in
death, electrical shock, or injury.
10.1 Principal of Operation
The energy conservation wheel module is a self-contained
unit consisting of the following components:
• Enthalpy wheel: Active air-to-air heat exchanger
portion of the module. It is constructed on corrugated
synthetic fiber-based media impregnated with a non-
migrating water selective molecular sieve desiccant.
Standard wheels are 4” (10.1 cm) thick and transfer the
total energy (sensible and latent) of the air-stream.
• Cassette: Steel structure composed of punched
sheet metal that houses the enthalpy wheel.
• Drive Motor: Constant speed, 220/1/60 motor rotates
the enthalpy wheel at a typical speed of 45 RPM via
multi-link drive belt.
• Variable Frequency Drive (Optional): Drive can be
used to vary the wheel’s rotation speed.
• Bypass Damper (Optional): Bypasses air around
the energy recovery wheel for frost control and
economizer operation.
See provided energy conservation wheel manual for
more information.
Figure 12: Example Energy Recovery
(ECW) Wheel
PR Series Installation, Operation, and Maintenance Manual
