4
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.)
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.
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
/
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.
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.
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
VERTICAL SUPPLY FANS
HORIZONTAL SUPPLY FANS
15” X 15” SUPPLY FANS
15” X 11” SUPPLY FAN
18” X 15” SUPPLY FAN
Summary of Contents for WeatherMaker 50TC 17-30 Series
Page 34: ...34 Fig 48 RTU Open Overlay for Economizer Wiring ...
Page 35: ...35 Fig 49 VFD Overlay for W2770 Controller Wiring ...
Page 80: ...80 Fig C 50TC 17 28 Control Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 81: ...81 Fig D 50TC 30 Control Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 82: ...82 Fig E 50TC 30 Control Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 83: ...83 Fig F 50TC 17 30 Power Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 84: ...84 Fig G 50TC 17 30 Power Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 89: ...89 Fig L 50TC PremierLink System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 90: ...90 Fig M 50TC RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 91: ...91 Fig N 50TC SAV VFD System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 93: ......
