21
ENERGY CONSERVATION WHEEL
Before starting up the unit, check the following:
1. Does the rotor rotate freely by hand?
If not, recheck the seal to determine whether or not it is binding and if so adjust seals following the instructions below.
2. Is the motor rotation correct?
This can be checked by detaching the belts from the drive sheave and bumping the motor. The sheave should be rotating
in the direction such that the belt will result in rotation per the exterior markings. If not, rewire the motor.
3.Does the air flow orientation match up to design?
See the identification markings on the cassette and/or refer to the general arrangement drawing to check the four duct
connections to the unit.
4. Are the belts on correctly and sufficiently tight?
Belt length is set by the manufacturer. Consult NovelAire if the belt appears too loose.
5. Is the VFD programmed to control the unit and to prevent frost formation?
If not, follow the instructions in the manual accompanying the VFD and/or consult NovelAire.
Seal checks
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 non-contact seal, small gaps may be seen between seal and sealing surface once the equilibrium
position is reached. Seal leakage is meant to be less than 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.
Variable speed drive (VFD)
Check the power supply for proper rating. Make sure that the proper jumper orientation is used for the specific control
input. Make sure that the unit is programmed for proper input voltage and output voltage.
Maintenance
Bearings
Small ECW’s, (smaller than ECW666) are provided with no maintenance inboard bearings. These bearings should require
no maintenance during the life of the equipment. Larger ECW’s come equipped with an external flanged bearing which
should be greased annually. Use a petroleum based lubricant.
Drive Motor
The drive motors should require no maintenance. Replacement motors may be purchased from normal motor distributors
such as Grainger, or directly from NovelAire if preferred.
Drive Belts
NovelAire ECW belts are multilink belts with individual links constructed of a high performance polyurethane elastomer
reinforced with multiple plies of polyester fabric. This belt provides a strong, yet flexible, belting. The multilink feature
provides quick, easy servicing or replacement. See the Appendix for belt repair/replacement instructions.
Seals
The seals are designed to be durable and require no maintenance other than adjustment, but if seals become worn or
damaged they may easily be replaced. The seals are made to clip on the cassette or post metal easily. Call NovelAire for
servicing information.
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. The wheel is somewhat self cleaning through its normal action of rotating in and out of
countercurrent air flow streams. If the wheel becomes dirty, it may be cleaned by blowing out the unit with compressed air
(20 psig maximum). In cases of severe filthiness, the wheel may be removed from the cassette and washed with water
following wheel removable procedures outlined below:
To Next Page
Loading...
