Filter
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4
22 3/8 (569 mm)
HOOD
DIVIDER
OUTSIDE
AIR
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
FILTER
CAP
FILTER
C08634
Fig. 3 -- Filter Installation
To remove the filter, open the spring clips. Re--install the
filter by placing the frame in its track, then closing the
spring clips.
Manua l Outside Air Hood Screen
This inlet screen is secured by a retainer angle across the
top edge of the hood. (See Fig. 4.)
C07156
Fig. 4 -- Screens Installed on Outdoor--Air Hood
(Sizes 7-1/2 to 12-1/2 Tons Shown)
To remove the screen, loosen the screws in the top retainer
and slip the retainer up until the filter can be removed.
Re-install by placing the frame in its track, rotating the
retainer back down and tighten all screws.
SUPPLY FAN (BLOWER) SECTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenanc e operations
on the fan system, shut off all unit power and tag--out
the unit disconnect switch. Do not reach into the fan
section with power still applied to unit.
!
WARNING
Supply Fan (Belt--Drive)
The supply fan system consists of a forward--curved
centrifugal blower wheel on a solid shaft with two
concentric type bearings, one on each side of the blower
housing. A fixed--pitch driven pulley is atta ched to the fan
shaft and an adjustable--pitch driver pulley is on the
motor. The pulleys are connected using a “V” type belt.
(See Fig. 5.)
C07087
Fig. 5 -- Belt Drive Motor Mounting
Belt
Check the belt condition and tension quarterly. Inspect the
belt for signs of cracking, fraying or glazing along the
inside surfaces. Check belt tension by using a spring-force
tool (such as Browning’s Part Number “Belt Tension
Checke r” or equivalent tool). Tension should be 6-lbs at a
5/8-in. (16 mm) deflection when measured at the
centerline of the belt span. This point is at the center of
the belt when measuring the distance between the motor
shaft and the blower shaft.
NOTE: Without the spring--tension tool, place a stra ight
edge across the belt surface at the pulleys, then deflect the
belt at mid--span using one finger to a 1/2-in. (13 mm)
deflection.
Adjust belt tension by loosening the motor mounting plate
front bolts and rear bolt and sliding the plate toward the
fan (to reduce tension) or away from fan (to increase
tension). Ensure the blower shaft and the motor shaft are
parallel to each other (pulleys aligned). Tighten all bolts
when finished.
580J