4
3. Replace the filters, as required, with similar replace-
ment filters of the same size.
4. Re--install the Return Air Filter and Indoor Coil
Access Panel.
Outdoor Air Hood
The outdoor air hood inlet screens are permanent
aluminum--mesh type filters. See Fig. 2. Inspect these
screens for cleanliness. Remove the screens when
cleaning is required. Clean by washing with hot
low--pressure water and soft detergent. Replace all screens
before restarting the unit. Observe the flow direction
arrows on the side of each screen frame.
Economizer Inlet Air Screen
The inlet air screen is retained by filter clips under the top
edge of the hood. See Fig. 3.
CLEANABLE
ALUMINUM
SCREEN
HOOD
FILTER
CLIP
OUTSIDE
AIR
BAROMETRIC
RELIEF
DIVIDER
17 1/4”
(438 mm)
C06027
Fig. 3 -- Inlet Air Screen Installation
Remove screens by removing the screws in the horizontal
clips on the leading edge of the hood. Slide filters out. See
Fig. 3.
Install filters, by sliding clean or new filters into the hood
side retainers. Once positioned, re--install the horizontal
clips.
SUPPLY FAN (BLOWER) SECTION
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.
!
WARNING
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 greaseable 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 connected
using a V--belt. See Fig. 4.
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 “Belt Tension Checker” (p/n:
1302546 or equivalent tool); tension should be 6--lbs at a
5
/
8
--in (1.6 cm). 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. See Fig. 5.
MOTOR
V-BELT
MOTOR ADJUSTMENT
BOLTS (4)
JACKBOLT LOCKING NUT (2)
MOTOR MOUNTING PLATE
JACKBOLT (2)
BLOWER 15” X 17”
BLOWER
SHAFT
BLOWER
18” X 15”
C12260
Fig. 4 -- Belt Drive Motor Mounting
BROWNING BELT
TENSION CHECKER
STRAIGHTEDGE
1/2”
(1.3 cm)
BELT
DEFLECTION
C12093
Fig. 5 -- Checking Blower Motor Belt Tension
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.
48H
C
Содержание 48HC D17 Series
Страница 76: ...76 APPENDIX IV WIRING DIAGRAMS C12615 Fig 76 48HC D17 D28 Control Diagram 208 230 3060 460 575 3 60 48HC...
Страница 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Страница 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Страница 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Страница 80: ...80 APPENDIX IV WIRING DIAGRAMS C14061 Fig 80 48HC D17 D28 Control Diagram with Humidi MiZer 48HC...
Страница 81: ...81 APPENDIX IV WIRING DIAGRAMS C12620 Fig 81 48HC D17 D28 Power Diagram 208 230 3 60 with Humidi MiZer 48HC...
Страница 82: ...82 APPENDIX IV WIRING DIAGRAMS C12621 Fig 82 48HC D17 D28 Power Diagram 460 3 60 with Humidi MiZer 48HC...
Страница 83: ...83 APPENDIX IV WIRING DIAGRAMS C12622 Fig 83 48HC D17 D28 Power Diagram 575 3 60 with Humidi MiZer 48HC...
Страница 85: ...85 APPENDIX IV WIRING DIAGRAMS C13766 Fig 85 PremierLinkt System Control Wiring Diagram with Humidi MiZer 48HC...
Страница 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Страница 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
