Manual 2100-533A
Page 7 of 12
CLEANABILITY AND PERFORMANCE
In order to maintain energy recovery ventilation
systems, energy transfer surfaces must be accessible for
washing to remove oils, grease, tars and dirt that can
impede performance or generate odors. Washing of the
desiccant surfaces is required to remove contaminate
buildups that can reduce adsorption of water molecules.
The continued ability of an enthalpy wheel to transfer
latent energy depends upon the permanence of the bond
between the desiccant and the energy transfer surfaces.
Bard wheels feature silica gel desiccant permanently
bonded to the heat exchange surface without adhesives;
the desiccant will not be lost in the washing process.
Proper cleaning of the Bard energy recovery wheel will
restore latent effectiveness to near original performance.
MAINTENANCE PROCEDURES
NOTE: Local conditions can vary and affect the
required time between routine maintenance
procedures, therefore all sites (or specific units
at a site) may not have the same schedule to
maintain acceptable performance. The
following timetables are recommended and can
be altered based on local experience.
QUARTERLY MAINTENANCE
1. Inspect mist eliminator/prefilter and clean if
necessary. This filter is located in the wall sleeve
and can be accessed by either removing the exterior
louver grille, the vent package from inside the unit,
or by disconnecting the unit from the wall brackets,
and rolling the unit away from the sleeve on its
integral wheel system. The filter is an aluminum
mesh filter and can be cleaned with water and any
detergent not harmful to aluminum.
2. Inspect the comfort air filter and clean or replace as
necessary. This filter is located behind the front-
hinged service door.
3. Inspect energy recovery ventilator for proper wheel
rotation and dirt buildup. This can be done in
conjunction with Item 2 above. Energize the energy
recovery ventilator after inspecting the filter and
observe for proper rotation and/or dirt buildup.
4. Recommended energy recovery wheel cleaning
procedures follow: Disconnect all power to the unit.
Open the front-hinged service door to the unit.
5. Remove the front cassette retaining panel from the
front of the ERV. Unplug the amp connectors to the
cassette drive motor. Slide energy recovery cassette
out of the ventilator.
6. Use a shop vacuum with brush attachment to clean
both sides of the energy recovery wheels.
7. Reverse shop vacuum to use as a blower and blow
out any residual dry debris from the wheel.
NOTE: Discoloration and staining of the wheel
does not affect its performance. Only
excessive buildup of foreign material needs
to be removed.
8. If any belt chirping or squealing noise is present,
apply a small amount of LPS-1 or equivalent dry
film lubricant to the belt.
ANNUAL MAINTENANCE
1. Inspect and conduct the same procedures as outlined
under Quarterly Maintenance.
2. To maintain peak latent (moisture) removal
capacity, it is recommended that the energy
recovery wheels be sprayed with a diluted nonacid
based evaporator coil cleaner or alkaline detergent
solution such as 409.
NOTE: Do not use acid based cleaners, aromatic
solvents, temperatures in excess of 170°F or
steam. Damage to the wheel may result.
Do not disassemble and immerse the entire heat
wheel in a soaking solution, as bearing and
other damage may result.
3. Rinse wheel thoroughly after application of the
cleaning solution, and allow to drain before
reinstalling.
4. No re-lubrication is required to heat wheel bearings
of the drive motor, or to the intake and exhaust
blower motors.
5. If any belt chirping or squealing noise is present,
apply a small amount of LPS-1 or equivalent dry
film lubricant to the belt.
