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Aerovent ES-2-06 User Manual

Page 8

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8

Twin City Fan Companies Engineering Supplement 2-06

Grouting

Grouting is the final installation step. Check all shims

before grouting to make sure that the fan is resting

evenly on all points with anchor bolts secured to hold

the shim. Use forms with sufficient space allowed for

working the grout. The concrete foundation should be

clean and well moistened before pouring grout. Use a

commercial grade non-shrinking grout and be especially

sure when pouring grout that the anchor bolt sleeves are

filled. Refer to Figure 2 for a detail of a proper founda-

tion, grout allowance and anchor bolt sleeves.

Drive Mounting

Mount drives as follows:

1. Slip (do not pound) proper sheave onto correspond-

ing shaft.

CAUTION: Placing fan sheave on motor can

overspeed wheel and cause structural failure.

2. Align sheaves with straightedge extended along

sheaves (see Fig. 5), just making contact in two

places on outside perimeters of both sheaves. This

“four-point” alignment may also be checked with a

string tied to the shaft behind one of the sheaves.

The string is then pulled taut over the faces of the

sheaves to check the alignment at the four points

at the outside perimeters. Each sheave should be

rotated about one-half revolution during this check

to look for excessive runout or a bent shaft. Parallel

alignment should be within 5mm per meter of center

distance. Angular Misalignment should be less than 1

degree.

3. Install and tighten the belts. Proper belt tension is

specified on the included documentation. Belts are

tensioned as follows:
Post type, saddle base, slide rails, and slide base

types use one or more bolts held by retaining nuts to

adjust the motor position. Loosen the retaining nuts

and adjust the bolts to push or pull the motor until

the belts reach their specified tension. Tighten the

retaining nuts per torque specifications in Table 1.

4. Run the drive for a few minutes to seat the belts.

When tightening the belts, slide the motor in to slip

the belts on. Do not use a pry bar, as this may dam-

age the belt cords. Retighten the belts to the proper

tension if necessary. Recheck sheave alignment.

5. After initial installation of belts, recheck belt tension

and alignment as indicated in Table 7.

Flexible Couplings

These instructions are general for the installation of

several types of flexible couplings and should not be

used as a substitute for more specific manufacturer’s

instructions. The coupling manufacturer’s installation data

is included with the supplied datasheet (when applicable)

and will give specific dimensions for alignment limits,

lubricants, etc.

Before preparing to mount the coupling, make sure

that all bearings, inlet vanes, shaft seals, or other com-

ponents have been installed on the shaft.

When mounting and keying the coupling halves to

the shaft, follow supplied instructions for heating and

shrink fitting. Set the coupling halves for the normal gap

specified by the manufacturer. Coupling gap is illustrated

in Figure 6.

The two types of misalignment are illustrated above.

Typically angular alignment is checked with feeler gaug-

es between the hub faces. When angular alignment has

been adjusted to manufacturer’s specification by shim-

ming, if necessary, parallel alignment can be checked

with a straightedge and feeler gauges on the hub halves’

O.D. When shimming has brought parallel alignment

within specification, angular alignment and gap should

again be checked, and adjustments made if necessary.

A dial indicator may be used to more accurately take

the measurements described above.

Special adjustments may need to be made for cou-

plings used with some equipment. As an example, when

used with motors of over 300 HP, couplings may require

provisions for limiting end float. Larger drivers may grow

in operation (due to heat expansion) requiring the driver

side to be set slightly low when not operating. Specific

instruction manuals or assembly drawings will indicate

these requirements when applicable.

Thoroughly clean the coupling halves after completion

of alignment. Reassemble the coupling and tighten bolts,

washers and locknuts. Lubricate per manufacturer’s rec-

ommendations.

Duct Connections

The fan support structure is normally not designed to

carry loads imposed by the weight of ducts, silencers,

stacks, etc. Supporting these loads on the fan can

cause housing distortion and may cause performance

problems due to the relation of fan housing to wheel.

Use of flexible connections is recommended.

Where hazardous materials will be conveyed in the

fan, all connections made by the user shall be com-

pletely sealed with material suitable for the gas or vapor

to be handled.

Guards and Enclosures

When advised of the need for guards fully complying

with the machinery directive, Twin City Fan Companies,

Ltd. will supply the guarding identified as being required.

In most cases, Twin City Fan Companies, Ltd. is not

aware of the end use and installation of the fan, which

typically eliminates the need for more restrictive guard-

ing to be compliant with EN 294 and EN 811. For this

reason, the user is must verify that the final installation

is compliant with EN 953, EN 294, and EN 811. This is

especially true of plug and plenum fans. Specific items

that should be considered include but are not limited

to the following:

Outlet ducting / enclosure. The ducting or enclosure

must be compliant to the requirements of EN 953

and EN 294 and EN 811. This is not assured by

Twin City Fan Companies, Ltd. unless specifically

notified by the end user at the time of the order.

Inlet guards. Inlet guarding relies on the additional

safety distance provided by inlet ducting or other

enclosure increasing the safety distance to 850 mm

or greater. This is because the installation usually

eliminates the need for excessive guarding on the

inlet of the fan. In addition, excessive guarding on

the inlet of the fan would significantly deteriorate

performance and is therefore not desirable.

Y

X

P

P

F

F

GAP

ANGULAR

PARALLEL

GAP AND

MISALIGNMENT

MISALIGNMENT

END FLOAT

X-Y = ANGULAR MISALIGNMENT

P = PARALLEL OFFSET (MISALIGNMENT)

F = END FLOAT

Figure 6. Coupling Alignment