Addison B Manual de instalación, uso y mantenimiento - Página 9
Navegue en línea o descargue pdf Manual de instalación, uso y mantenimiento para Aire acondicionado Addison B. Addison B 19 páginas. High efficiency packaged air conditioning systems
Imprimir página
DRIVE BELT TENSION AND ALIGNMENT
Fan belt alignment and tension should be checked.
Tension should be 3/4" depression per foot of belt span
between pulleys.
Personal injury hazard.
Use extreme care during the following procedures and
obey Safety Information.
Failure to do so may result in personal Injury.
The following safety rules MUST always be followed when
working near belt drive.
Always Turn The Power Off
1. Turn the power to the unit OFF before you begin
working on it.
Always Wear Protective Clothing
2. NEVER wear loose or bulky clothes, such as
neckties, exposed shirttails, loose sleeves, or lab
coats around belt drives. Wear gloves while
inspecting sheaves to avoid nicks, burrs, or sharply
worn pulley edges.
The blower speed is changed by adjusting the
variable speed pulley mounted on the blower motor.
If the blower speed needed is different than the
speed of the blower as shipped, follow the steps
below to change the blower speed. Before changing
the blower speed, read the above safety rules first.
3. Turn electric power OFF.
4. Remove the side blower access panel.
Loosen the four motor mount bolts.
MECHANICAL ADJUSTMENTS CONTINUED
18. It may be necessary to back the tension off the belt
temporarily and tighten one of the motor mount
bolts before it is possible to adjust the angle of the
blower motor.
19. Tighten all four blower motor mount bolts.
8
6. Turn the motor adjustment bolt counterclockwise until
the belt is slack enough to come off easily.
7. Remove the belt. Do NOT pry off belt.
8. Loosen set screw(s) on the outer half of the
adjustable pulley.
9. The unit has one of two different types of adjustable
pulleys.
10. Remove key if unit has a keyway type pulley.
11. To set the blower for a desired CFM (L/s), first turn
the outer half of the adjustable pulley clockwise until it
meets the inner half of the pulley.
12. Turn the outer half of the adjustable pulley counter
clockwise the correct number of turns to obtain the
desired CFM (L/s).
NOTE: To increase the blower speed, turn the outer
half of the adjustable pulley clockwise. To decrease
the blower speed, turn the outer half of the adjustable
pulley counter clockwise.
13. Replace key if unit has keyway type pulley.
14. Tighten set screw(s).
15. Put on belt.
16. Turn motor adjustment bolt clockwise until the belt
has enough tension at the proper deflection. Use one
of the commercially available belt tension gauges to
set the correct tension at the proper deflection.
17. Use a straight edge (angle iron, straight piece of
board or anything with a straight surface or edge) to
check the alignment of the blower pulley with blower
motor pulley.