Accurex XRUD Direct Drive Manual de instalação, operação e manutenção - Página 9

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1. Parts List

IMPORTANT

Uneven cleaning of the wheel will produce an out of

balance condition that will cause vibration in the fan.

Installation and maintenance are to be performed only

by qualiﬁed personnel who are familiar with local codes

and regulations and who are experienced with this type

of equipment.

Motor maintenance is generally limited to cleaning

and lubrication (where applicable). Cleaning should be

limited to exterior surfaces only. Removing dust buildup

on motor housing ensures proper motor cooling.

Greasing of motors is only intended when ﬁttings are

provided. Many fractional horsepower motors are

permanently lubricated and should not be lubricated

after installation. Motors supplied with grease ﬁttings

should be greased in accordance with manufacturer's

recommendations. Where motor temperatures do not

exceed 104ºF (40ºC), the grease should be replaced

after 2,000 hours of running time as a general rule.

Wheels require very little attention when moving clean

air. Occasionally, oil and dust may accumulate causing

imbalance. When this occurs, the wheel and housing

should be cleaned to ensure smooth and safe operation.

All fasteners should be checked for tightness each time

maintenance checks are performed prior to restarting

unit.

• When installing fans for restaurant exhaust

applications follow NFPA 96 for cleaning fans.

• Grease containers must be emptied at regular

intervals to prevent overﬂow.

A proper maintenance program will help these units

deliver years of dependable service.

Tapered Bushing Hub Installation

and Removal

For wheel hubs and shaft pulleys utilizing a tapered

bushing interface, follow this procedure for installation

and removal. There are two possible set ups for the

tapered bushing, both have the same procedure, but

orientation of the hub varies.

Tapered Bushing Removal:

1. If present, loosen the setscrew holding the bushing

and shaft key in place.

2. Loosen and remove the socket head cap screws

which fasten the bushing to the hub as shown in the

section views and examples of Figures 18-21.

3. Standard Mounting: Take the two socket head cap

screws that were removed and install them into the

visibly threaded holes on the wheel hub.

Reverse Mounting: Install the two socket head cap

screws into the visibly threaded holes of the bushing

ﬂange.

4. Once both socket head cap screws are installed,

tighten them an eighth of a turn at a time, alternating

between the two until the hub comes loose from the

bushing.

Standard Mounting

Bushing

Hub

Washers

Cap Screws

Figure 18

Figure 20

Standard Bushing Orientation

Bushing Installation

1. Clean all surfaces of hub and bushing to remove any

oil or residue present and do not use any lubricant to

install bushing into the hub. For both standard and

reverse mounting styles, the socket head cap screws

are adjustable from the inlet of the fan.

2. Standard Mounting: Slide the bushing and shaft

key onto the fan shaft followed by the wheel and hub

assembly. If present, use the keyway setscrew to

hold the shaft key and bushing in place but DO NOT

overtighten as this can damage the bushing. Align

the unthreaded holes of the hub with the threaded

holes of the tapered bushing.

Reverse Mounting: Slide the wheel and hub

assembly onto the fan shaft followed by the bushing

and shaft key. If present, use the keyway setscrew to

hold the shaft key and bushing in place but DO NOT

overtighten as this can damage the bushing. Align

the unthreaded holes of the tapered bushing with the

threaded holes of the hub.

Upblast Centrifugal Roof Exhaust

Reverse Mounting

Hub

Bushing

Washers

Cap Screws

Figure 19

Figure 21

Reverse Bushing Orientation