Carrier 48TC series, Инструкции по обслуживанию и техническому обслуживанию, Страница: 4 / 112

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ECONOMIZER AND MANUAL OUTSIDE AIR SCREENS
This air screen is retained by spring clips under the top edge of the
hood. (See Fig. 3.)
To remove the filter, remove screws in horizontal filter retainers
on leading edge of hood. Slide filters out. To re-install filters, slide
clean or new filters into hood side retainers. Once positioned, re-
install horizontal filter retainer.
Fig. 3 — Filter Installation
ECONOMIZER INLET AIR SCREEN
This air screen is retained by spring clips under the top edge of the
hood. (See Fig. 4.)
Remove screens be removing the screws in the horizontal clips on
the leading edge of the hood. Slide the filters out. See Fig. 4.
Install the filters by sliding clean or new filters into the hood side
retainers. Once positioned, re-install the horizontal clips.
Fig. 4 — Inlet Air Screen Installation
SUPPLY FAN (BLOWER) SECTION
Supply Fan Assembly
The supply fan system consists of two forward-curved centrifugal
blower wheels mounted on a solid blower shaft that is supported
by two greasable pillow block concentric bearings. A fixed-pitch
driven fan pulley is attached to the fan shaft and an adjustable-
pitch driver pulley is mounted on the motor. The pulleys are con -
nected using a V-belt. (See Fig. 5.)
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 Brown -
ing’s “Belt Tension Checker” (P/N 1302546 or equivalent tool);
tension should be 6 lb at a
5
/
8
-in. (1.6 cm) deflection when mea -
sured at the center line 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. See Fig. 6.
NOTE: Without the spring-tension tool, place a straight edge
across the belt surface at the pulleys, then push down on the belt at
mid-span using one finger until a
1
/
2
-in. (1.3 cm) deflection is
reached.
Fig. 6 — Checking Blower Moter Belt Tension
ADJUSTING THE BELT TENSION
Use the following steps to adjust the V-belt tension. See Fig. 5.
1. Loosen the four motor mounting nuts that attach the motor to
the blower rail.
CAUTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or
death.
Before performing service or maintenance operations on the
fan system, shut off all unit power and lockout/tag-out the unit
disconnect switch. DO NOT reach into the fan section with
power still applied to unit.
17 1/4”
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
MOTOR
V-BELT
MOTOR ADJUSTMENT
BOLTS (4)
JACKBOLT LOCKING NUT (2)
MOTOR MOUNTING PLATE
JACKBOLT (2)
BROWNING BELT
TENSION CHECKER
STRAIGHTEDGE
1/2”
(1.3 cm)
BELT
DEFLECTION