Sterling ERMS - Manual (Page 17)

5
CAUTION
Do Not use acid based cleaners, arom atic
solvents, steam or temperatures in excess
of 170ºF; damage to the wheel may occur !
frame and segment retainers are completely
fastened. (See Figure 4 page 6).
3. With hands and objects away from moving
parts, acti vate uni t and confirm wheel rotation.
W heel rotates cloc kwise (as viewed from the
pulley side).
4. If wheel has di fficulty starting, turn power off and
i nspect for excessive interference between the
wheel s urface and each of the four (4) diameter
seals. To correct, loosen diameter seal adjusting
screws and back adjustable diameter seals away
from surface of wheel, apply power to confirm
wheel is free to rotate, then re-adjust and tighten
hub and diameter seals according to instructions
on page 6 (Figure 3 ).
5. Start and stop wheel several times to c onfirm
seal adjustment and to confirm belt is tracking
properly on wheel rim (approximately 1/4” from
outer edge of rim).
R R R R ROUTINE MAINTENANCE OUTINE MAINTENANCE OUTINE MAINTENANCE OUTINE MAINTENANCE OUTINE MAINTENANCE
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 Cleaning Cleaning Cleaning 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 Airxchange wheel 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 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 Grainger, Stock # 5W402) 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.
Air Seals Air Seals Air Seals Air Seals Air Seals
Four adjustable diameter seals are provided on each
cassette to minimize transfer of air between the
counterflowing airstreams.
To adjust diameter seals, loosen diameter seal adjusting
screws and back seals away from wheel surface (Figure 3
page 6). 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 Wheel Drive Components Wheel Drive Components Wheel Drive Components Wheel Drive Components
The wheel drive motor
wheel drive motor wheel drive motor wheel drive motor wheel drive motor bearings are pre-lubricated and
no further lubrication is necessary.
The wheel drive pulle wheel drive pulle wheel drive pulle wheel drive pulle wheel drive pulley y y y y is secured to the drive motor
shaft by a combination of either a key or D slot and set
screw. The set screw is secured with removable locktite to
prevent loosening. Annually confirm set screw is secure.
The wheel drive belt wheel drive belt wheel drive belt wheel drive belt 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.
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