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ENERGY RECOVERY WHEEL
LG DOAS DB series ventilator includes integral total
enthalpy energy recovery. The energy recovery media
(wheel) is built into a cassette that can slide out of the
ventilator without tools. The energy wheel is accessed
through a hinged door with quarter-turn handles and
latches.
Table 14: Wheel Models in DB chassis
Chassis
Energy Recovery Wheel Model
DB
ECW414 - Customized
Adjust the Air Seals
WARNING
Keep hands away from rotating wheel, contact with rotating
wheel can cause physical injury
The ECW is provided with a neoprene bulb seal which
provides not only an effective seal in both the peripheral
and side-to-side sealing directions but also one which is
easily adjusted to compensate for seal run in, shipping
misalignment, etc. The neoprene bulb is attached to a
metal reinforced U-shaped neoprene grip.
The metal/neoprene grip allows for an expandable grip
range which can be moved closer or further from the
sealing face as needed. The peripheral bulb seals
against the wheel outer band and the inner bulb seals
against the wheel face. With the wheel stopped, move
seals as close to the sealing surface as possible but
without exceeding grip range of bulb seal and without
pressing the bulb down against the seal face. Bump the
motor. If the motor will not turn, the seal is too close and
should be nudged back where needed. The seal will
seek its equilibrium position based on the closest part of
the sealing face. Because the seal is meant to be a
noncontact seal, small gaps may be seen between seal
and sealing surface once the equilibrium position is
reached. Seal leakage is meant to be under 5% at 1
inch of differential between supply and exhaust. Some
seal run-in is to be expected, so don't be alarmed by
small amounts of wear in the neoprene.
Maintenance
Wheel
The wheel is designed to last the life of the equipment. It
should be protected by an ASHRAE 30% filter to keep
dust and dirt from the heat transfer surface
In the event that routine annual inspection indicates that
there is dirt or dust buildup within the wheel causing an
excessive pressure drop, then wheel cleaning should be
performed as follows:
1. Using a standard shop vacuum, vacuum any debris
from both faces of the wheel. Slowly work around the
entire face of the wheel to complete the procedure.
Do not damage wheel face by excessive pressure
of the vacuum nozzle on the wheel face.
2. Using 20 psig clean dry air, and a small air nozzle,
blow air through one face of the wheel. At a similar
location on the opposite side of the wheel, gently
apply a shop vacuum to “receive” any remaining
debris exiting the wheel.
In the event that this method does not remove visual
buildup or return pressure drop to within normal
parameters, a wheel washing procedure is
recommended
. The NovelAire Technologies’ energy
conservation wheels can be washed thoroughly with
water without affecting the performance of the wheel.
The wheel will simply dry out following a washing
procedure and resume normal energy transfer without
any deviation in performance.
If the energy conservation wheel can be easily removed
from the cassette or unit, it is recommended to do so to
facilitate the washing process. However, in most cases,
it is impractical to remove larger wheels and therefore,
the washing procedure must take place within the air
handling unit and provisions need to be made to collect
the runoff water from the bottom of the unit or collect the
water by using a wet vac on the opposite side of the
wheel during the procedure.
1. Shield all electrical components and bearings with
plastic sheeting. Ensure that an adequate drainage
system exists to collect runoff water from the bottom
of the unit. Alternatively, use a wet vac with a wide
nozzle on the opposite face of the wheel to collect the
water during the washing procedure.
2. Disable the drive motor.
3. Using standard pressure water ( Do not use a high
pressure washer) and working from the one side of the
wheel, wash the wheel with a standard “garden”
nozzle to flush any debris trapped within the flutes of
the wheel. If desired, a mild detergent can also be
used to enhance cleaning without effecting the
performance of the wheel.
4. After washing, energize the drive motor and begin
rotating the wheel. Place the unit back into service and
the wheel will dry completely and return to normal
performance in a relatively short period of time
DANGER
Before performing service or maintenance operation on the
wheel, turn off main power. Electric shock can cause physical
injury or death.
