Caution, Design considera, Opera – Sterling ERMS User Manual

Page 16: Opera operation tion tion tion tion

Figure 1 Lifting Hole Locations

Fig ure 2 Av oid Racking of Cassette Frame

CAUTION

Keep hands away from rotating wheel!!
Contact with rotating wheel can cause
physical injury.

DESIGN CONSIDERA

DESIGN CONSIDERATIONS

TIONS

Energy recovery cassettes can be incorporated within
the design of packaged rooftop units, packaged
airhandlers, energy recovery ventilators, or site built air
handling systems. In each case, it is recommended
that the following considerations be addressed

Accessibility

Accessibility
The cassette and all its operative parts; i.e.: motor,
belt, pulley, bearings, seals and energy transfer
segments must be accessible for service and
maintenance. The most practical design to allow
complete access is one in which the cassette can slide
at least half way out of the cabinet or ductwork for
service. This design requires that adequate clearance
be provided outside the enclosure.

Where cassettes are permanently installed in a
cabinet, access to both sides of the cassette must be
provided. Internal partitions that separate air streams
must allow access for bearing removal.

Orientation & Suppor

Orientation & Supporttttt
The Energy Recovery Cassette may be mounted in
any orientation. However, Care m

Care m

Care must be taken to

ust be taken to

make cer

make certain that the cassette frame remains flat

tain that the cassette frame remains flat

and the bearing beams are not rac

and the bearing beams are not racked as sho

ked as sho

ked as shown in

wn in

Figure 2.

Figure 2. To verify, make certain that the distance
between wheel rim and bearing beam is the same at
each end of the bearing beam, to within 1/4 of an inch
(dimension A & B, Fig. 2). This amount of racking can
be compensated for by adjusting the diameter seals
(see Fig. 3). If greater than 1/4 inc

If greater than 1/4 inc

If greater than 1/4 inch,

h, rac

rac

racking m

king m

king must

ust

be corrected to ensure that drive belt will not

be corrected to ensure that drive belt will not
disenga

disenga

disengag

ge fr

e fr

e from wheel.

om wheel.

Note: Bearing beam racking of as little as .040 inches
(Dim C, Fig. 2) will cause the wheel to tilt 3/16” at the
rim.

Diameter Seals

Diameter Seals
Diameter seals are adjusted at the factory when the
wheel is in the vertical position. Cassettes installed at
angles greater than 30 degrees from vertical will
require seal re-adjustment (see page 6, Figure 3).
Adjust diameter seals so as to avoid excessive wheel
drag. A final check of seal adjustment is
recommended for all designs.

Wheel Drive Motor

Wheel Drive Motor
Cassette series 36 through 52 are provided with single
phase wheel drive motors (capacitor included). Single
phase motors may be pre-wired in the factory with
either a three pin Amp connector or three prong
NEMA plug. The motor is designed to rotate clockwise
when viewed from the shaft/pulley side.

Three phase wheel drive motors are provided with
optional 208/230V or 460/480V wiring. Motors may be
pre-wired in the factory upon request. Wiring
diagrams are provided with each motor. When wired
according to wiring diagram, motor rotates clockwise
when viewed from the shaft/pulley side.

OPERA

OPERATION

TION

Star

Start Up Pr

t Up Pr

t Up Procedure

ocedure

By hand, turn wheel clockwise (as viewed from

the pulley side), to verify wheel turns freely
through 360º rotation.

Before applying power to drive motor, confirm

wheel segments are fully engaged in wheel

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