Supply Fan (Blower) Section; Supply Fan Assembly - Carrier WeatherMaker 50TC 17-30 Series Service And Maintenance Instructions

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.
17 1/4"
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 4 — Inlet Air Screen Installation

SUPPLY FAN (BLOWER) SECTION

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.

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.)
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
4
VERTICAL SUPPLY MODELS
The two fan wheels used on the vertical supply models are the
same: 15-in. diameter x 15-in. width. This arrangement provides
uniform airflow distribution across the width of the evaporator
coil, electric heater, and into the supply duct.
HORIZONTAL SUPPLY MODELS
The horizontal supply models have two different fan wheel sizes
on a single shaft. The front side wheel is 18-in. diameter x 15-in.
wide, while the rear side fan is 15-in. diameter x 11-in. wide. This
arrangement promotes uniform airflow across the width of the
evaporator coil and heater assembly while using a supply outlet on
the rear side of the unit.
NOTE: This major difference in the fan system design makes it
impossible to field-convert the 50TC unit's supply fan outlet
configuration.
VERTICAL SUPPLY FANS
15" X 11" SUPPLY FAN
HORIZONTAL SUPPLY FANS
Fig. 5 — Supply Fan Arrangements
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
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.
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
reached.
15" X 15" SUPPLY FANS
18" X 15" SUPPLY FAN
/ -in. (1.6 cm) deflection when mea-
8
/ -in. (1.3 cm) deflection is
1
2