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3. Motor bearings are prelubricated. Consult information printed on
motor for lubrication instructions.
4. Check belt tension after rst 48 hours of operation and thereafter
annually. Belt should depress its width when pressed rmly
inward at midway point between the pulleys. Too much tension
will damage bearings. Belt should be tight enough to prevent
slippage. When replacing worn belt, replace motor pulley if
“shoulder” is worn in groove.
WARNING! Do not replace the motor pulley with a larger
diameter pulley. Do not replace the fan pulley with one smaller
in diameter. The pulley ratios are set so that the motor will not
be overloaded. Do not operate at speeds higher than that
cataloged for this equipment.
5. If impeller shaft bearings need replacement, replace with
bearings comparable to the original equipment. If duplex
split pillow block bearings are used, install new bearings into
neoprene rings, check correct position of impeller with orice,
position bearings in die-formed recess and tighten set screws.
(Minimum/maximum torque settings shown in Table 1.) Replace
die-formed bearing cap and tighten four bolts.
NOTE: If locking collar type bearing is used, collar must rst be
positioned against inner race on the bearing nearest the impeller
and turned in the direction of impeller rotation with drift pin and
hammer until it locks. Locking collars must be on the inboard
(facing) sides of the bearings. Secure the bearing to the shaft
with torque set screw. Lock and secure the other bearing to the
shaft in the same manner.
NOTE: If pillow block type bearings are used, slide bearings
onto shaft to desired location and bolt bearing block securely to
support base. Slide shaft back and forth in secured bearing (do
not drive with hammer) and rotate to make certain it turns freely.
Check correct position of impeller with inlet orice. Then secure
bearings to shaft by tightening set screws.
SET SCREW TIGHTENING SCHEDULE
1. Before initial operation of the fan, tighten set screws according
to the procedure outlined below.
2. After 500 operating hours or three months, whichever comes
rst, tighten set screws to the full recommended torque.
3. At least once a year, tighten set screws to the full recommended
torque.
PROCEDURE FOR TIGHTENING SET
SCREWS IN BEARINGS AND HUBS
One Set Screw Application
Using a torque wrench, tighten the set screw to the torque
recommended in Table 1.
Two Set Screw Application
1. Using a torque wrench, tighten one set screw to half of the
torque recommended in Table 1.
2. Tighten the second set screw to the full recommended torque.
3. Tighten the rst set screw to the full recommended torque.
VARIABLE FREQUENCY
DRIVES AND MOTORS
There are occasions when a Variable Frequency Drive (VFD) will
cause poor motor performance and possible damage. To avoid these
problems, the Company recommends the following:
1. Select compatible motor and VFD inverter; if possible, the motor
and the inverter should be from the same manufacturer or at
least the inverter selected should be recommended by the motor
manufacturer.
2. A motor shaft grounding system should be used to prevent
motor bearing damage from eddy currents.
NOTE: The Company will not honor motor warranty claims if the
customer fails to follow these recommendations.
Table 1. Recommended Tightening Torque for Set Screws
Set Screw Diameter Torque (in-lbs)
#10 35
1/4 80
5/16 126
3/8 240
7/16 384
1/2 744
9/16 1080
5/8 1500
3/4 2580
7/8 3600
1 5400
_________________________________________________________________________________________________________________________
2017 © North American Kitchen Solutions
172 Reaser Court, Elyria, OH 44035
Toll Free: (800) 715-1014
customerservice@naksinc.com
Page 3 of 6
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Productinformatie
| Merk | NAKS |
| Model | 52B-DBFF-4000 |
| Categorie | Afzuigkap |
| Taal | Nederlands |
| Grootte | 929 MB |
