AAON RK Series - Manual (Page 6)

6
plates to the bearing support channels and slide the
seal 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 & 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 operating
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 by consulting appropriate submittal, or order
documents, and operate according to the control
manufacturer’s instructions. If you cannot locate
installation, operation, or maintenance information for
the specific controls, then contact your sales
representative, or the control manufacturer for
assistance.
ROUTINE MAINTENANCE & HANDLING
Handle cassettes with care. All cassettes should be
lifted by the bearing support beam. Holes are provided
on both sides of the bearing support beams to facilitate
rigging as shown in the following illustration.
Lifting Hole Locations
Routine maintenance of the Energy Recovery
Cassettes includes periodic cleaning of the Energy
Recovery Wheel as well as inspection of the Air Seals
and Wheel Drive Components as follows:
Cleaning
The need for periodic cleaning of the energy recovery
wheel will be a function of operating schedule, climate
and contaminants in the indoor air being exhausted
and the outdoor air being supplied to the building.
The heatwheel is “self-cleaning” with respect to dry
particles due to its laminar flow characteristics. Smaller
particles pass through; larger particles land on the
surface and are blown clear as the flow direction is
reversed. Any material that builds up on the face of the
wheel can be removed with a brush or vacuum. The
primary need for cleaning is to remove oil based
aerosols that have condensed on energy transfer
surfaces.
A characteristic of all dry desiccants, such films can
close off micron sized pores at the surface of the
desiccant material, reducing the efficiency by which
the desiccant can adsorb and desorb moisture and
also build up so as to reduce airflow.
In a reasonably clean indoor environment such as a
school or office building, measurable reductions of
airflow or loss of sensible (temperature) effectiveness
may not occur for several years. Measurable changes
in latent energy (water vapor) transfer can occur in
shorter periods of time in applications such as
moderate occupant smoking or cooking facilities. In
applications experiencing unusually high levels of
occupant smoking or oil based aerosols such as
industrial applications involving the ventilation of
machine shop areas for example, annual washing of
energy transfer may be necessary to maintain latent
transfer efficiency. Proper cleaning of the energy
Do not alter factory wiring. Deviation from the
supplied wiring diagram will void all warranties,
and may result in equipment damage or personal
injury. Contact the factory with wiring
discrepancies.
WARNING