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By carefully reviewing the information
within this section and following the
instructions, the risk of improper operation
and/or
component
damage
will
be
minimized.
It is important that periodic maintenance be
performed to help assure trouble free
operation.
Initial Mechanical Check and Setup
Outdoor air intake adjustments should be
made according to building ventilation, or
local code requirements.
After the unit installation is complete, open
the cassette access door and determine that
the energy wheel rotates freely when turned
by hand. Apply power and observe that the
wheel rotates at approximately 30 RPM. If
the wheel does not rotate when power is
applied, it may be necessary to readjust the
“diameter air seals”.
Air Seal Adjustments
Pile type air seals across both sides of the
energy wheel diameter are factory adjusted to
provide close clearance between the air seal
and wheel. Racking of the unit or cassette
during installation, and/or mounting of the
unit on a non-level support or in other than
the factory orientation can change seal
clearances. Tight seals will prevent rotation.
Figure 19 - Cross Section of Air Seal
Structure
Wheel to Air Seal Clearance
To check wheel to seal clearance; first
disconnect power to the unit, in some units
the energy recovery wheel assembly can be
pulled out from the cabinet to view the air
seals. On larger units, the energy recovery
wheel may be accessible inside the walk-in
cabinet.
A business card or two pieces of paper can be
used as a feeler gauge, (typically each .004”
thick) by placing it between the face of the
wheel and pile seal.
Using the paper, determine if a loose slip fit
exist between the pile seal and wheel when
the wheel is rotated by hand.
To adjust air seal clearance, loosen all seal
plate retaining screws holding the separate
seal retaining plates to the bearing support
channels and slide the seals plates away from
the wheel. Using the paper feeler gauge,
readjust and retighten one seal plate at a time
to provide slip fit clearance when the wheel
is rotated by hand.
Confirm that the wheel rotates freely. Apply
power to the unit and confirm rotation.
Airflow Balancing and Checking
High performance systems commonly have
complex air distribution and fan systems.
Unqualified personnel should not attempt to
adjust fan operation, or air circulation, as all
systems
have
unique
operations
characteristics. Professional air balance
specialists should be employed to establish
actual operating conditions, and to configure
the air delivery system for optimal
performance.
Controls
A variety of controls and electrical
accessories may be provided with the
equipment. Identify the controls on each unit
