Manual 2100-597G - Bard I30A1DA Installation Instructions Manual

levels of smoke or oil-based aerosols such as those
found in welding or machining operations, for example.
In these applications, latent efficiency losses of as
much as 40% or more may develop over a period of 1
to 3 years.
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 fresh air
intake hood on the front of the unit. This is an
aluminum mesh filter and can be cleaned with
water and any detergent not harmful to aluminum.
2. Inspect wall mount unit filter and clean or replace
as necessary. This filter is located either in the
unit, in a return air filter grille assembly or both.
If in the unit it can be accessed by removing the
lower service door on the front of the unit. If in
a return air filter grille, gain access by hinging the
grille open.
3. Inspect energy recovery ventilator for proper wheel
rotation and dirt buildup. This can be done in
conjunction with Step 2. Energize the energy
recovery ventilator after inspecting the filter and
observe for proper rotation and/or dirt buildup.
4. Follow Steps 5 through 8 for recommended energy
recovery wheel cleaning procedures.

Manual 2100-597G

Page 58 of 68
5. Disconnect all power to unit. Remove the lower
service door of the wall mount unit to gain access
to the energy recovery ventilator.
6. Remove the front access panel on the ventilator.
Unplug amp connectors to cassette motors. Slide
energy recovery cassette out of ventilator.
7. Use a shop vacuum with brush attachment to clean
both sides of the energy recovery wheels.
8. 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.
9. 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 re-
installing.
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.
See Figure 32.