Johnson Controls YORK 120 Instrucciones página 13

Pulley adjustment and
belt tensing (Models 360
- 480)
1.- Adjusting pulley opening.
- Loosen the crown by loosening tension
screw "A".
- Loosen grub screws "B" to release mo-
bile rims "C".
- Turn both mobile rims on the thread of
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Caution: Disconnect all power supply to the unit before starting any of these operations.
the fixed core of the pulley in the ad-
equate direction to increase or decrease
the pulley opening.
- Tighten the grub screws, coinciding with
their seating in the fixed hub of the pul-
ley.
2.- Belt tensing.
- Tense by means of tension screw "A".
- If no belt tension measuring device is
available, use the following practical
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3.- It is recommendable to check tension
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Fig. 2
GB
method:
Apply a 5 kg. force on the mid-point of
the belt, and perpendicular to same.
With the application of this force, the belt
should bend between 12 and 14 mm.
twice during the first 24 hours of opera-
tion.
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13