Routine Maintenance
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 Daikin wheel is “self-cleaning” with respect tiny 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
desorbs moisture and also build up so as to reduce airflow.
In a reasonably clean indoor environment such as 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 recovery wheel will restore latent effectiveness to near
original performance.
To clean, gain access to the energy recovery wheel and
remove segments. Brush foreign material from the face of the
wheel. Wash the segments or small wheels in a 5% solution
of non-acid based coil cleaner (such as Acti-Klean, available
through Daikin, Stock # AK1) or alkaline detergent and warm
water. Soak in the solution until grease and tar deposits are
loosened (Note: some staining of the desiccant may remain
and is not harmful to performance).
Before removing, rapidly run finger across surface of segment
to separate polymer strips for better cleaning action. Rinse
dirty solution from segment and remove excess water before
reinstalling in wheel.
CAUTION
Do not use acid based cleaners, aromatic solvents, steam
or temperatures in excess of 170ºF; damage to the wheel
may occur!
Air Seals
Four adjustable diameter seals are provided on each cassette
to minimize transfer of air between the counter flowing
airstreams .
To adjust diameter seals, loosen diameter seal adjusting
screws and back seals away from wheel surface (
Rotate wheel clockwise until two opposing spokes are hidden
behind the bearing support beam. Using a folded piece of
paper as a feeler gauge, position paper between the wheel
surface and diameter seals. Adjust seals towards wheel
surface until a slight friction on the feeler gauge (paper) is
detected when gauge is moved along the length of the spoke.
Retighten adjusting screws and recheck clearance with “feeler”
gauge.
Wheel Drive Components
The wheel drive motor bearings are prelubricated and no
further lubrication is necessary.
The wheel drive pulley is secured to the drive motor shaft by
a combination of either a key or D slot or setscrew. The set
screw is secured with removable locktite to prevent loosening.
Annually confirm set screw is secure.
The wheel drive belt is a urethane stretch belt designed
to provide constant tension through the life of the belt. No
adjustment is required. Inspect the drive belt annually for
proper tracking and tension. A properly tensioned belt will turn
the wheel immediately after power is applied with no visible
slippage during start-up.
Figure 90: Adjusting Diameter Seals
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
108
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