7
Replacing the Motor
1.
Turn off all electrical power to the unit. Use approved
lockout/tagout procedures on all electrical power
sources.
2.
Remove the cover on the motor connection box.
3.
Disconnect all electrical leads to the motor.
4.
Loosen the two jack bolt jamnuts on the motor
mounting bracket.
5.
Turn the two jack bolts counterclockwise until the
motor assembly moves closer to the blower pulley.
6.
Remove the V-belt from the blower pulley and motor
pulley.
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in
premature wear and damage to equipment.
Do not use a screwdriver or pry
−
bar to place the new
V
−
belt in the pulley groove. This can cause stress on
the V
−
belt and the pulley, resulting in premature wear
on the V
−
belt and damage to the pulley.
CAUTION
!
7.
Loosen the four mounting bracket bolts and lock
washers.
8.
Remove four bolts, four flat washers, four lock wash
ers and four nuts attaching the motor mounting plate
to the unit. Discard all lock washers.
9.
Remove the motor and motor mounting bracket from
the unit.
10.
Remove four bolts, flat washers, lock washers and
single external-tooth lock washer attaching the motor
to the motor mounting plate. Discard all lock washers
and external-tooth lock washer.
11.
Lift the motor from the motor mounting plate and set
aside.
12.
Slide the motor mounting band from the old motor.
13.
Slide the motor mounting band onto the new motor
and set the motor onto the motor mounting plate.
14.
Remove the variable pitch pulley from the old motor
and attach it to the new motor.
15.
Inspect the variable pitch pulley for cracks and wear.
Replace the pulley if necessary.
16.
Secure the pulley to the motor by tightening the pul
ley setscrew to the motor shaft.
17.
Insert four bolts and flat washers through the mount
ing holes on the motor and into holes on the motor
mounting plate.
18.
On one bolt, place a
new
external-tooth lock washer
between the motor and motor mounting band.
19.
Make sure the teeth of the external-tooth lock washer
make contact with the painted base of the motor.
This
washer is essential
for properly grounding the motor.
20.
Install four new lock washers and four nuts on the
bolts on the bottom of the motor mounting plate, but
do not
tighten the mounting bolts at this time.
21.
Set the new motor and motor mounting bracket back
onto the unit. See Fig. 10.
22.
Install four bolts, four flat washers, four new lock
washers and four nuts attaching the motor assembly
to the unit, but
do not
tighten the mounting bolts at
this time.
23.
Install the motor drive V-belt to the motor pulley and
blowerwheel pulley. See CAUTION.
24.
Align the motor pulley and blower wheel pulley using
a straight edge. See Fig. 6.
25.
Adjust the V-belt tension using the adjustment tool.
26.
Turn the two jack bolts clockwise, moving the motor
assembly away from the blower pulley, increasing the
V-belt tension.
27.
Tighten the four bolts securing the motor mounting
brackets to the unit. Torque bolts to 120
±
12 in-lbs
(14
±
1.4 Nm).
28.
Remove the cover on the motor connection box.
29.
Re-connect all electrical leads to the motor and re
place the connection box cover.
30.
Re-connect all electrical power to the unit. Remove
lockout tags on all electrical power sources.
31.
Start the unit and allow to run for a designated period.
32.
Shut off the unit and make any necessary adjustments
to the V-belt tension or the motor and blower wheel
pulley alignment.
BROWNING BELT
TENSION CHECKER
STRAIGHTEDGE
1/2”
(1.3 cm)
BELT
DEFLECTION
C12093
Fig. 10
−
Adjusting V
−
belt Tension
Changing Fan Wheel Speed by Changing Pulleys
The horsepower rating of the belt is primarily dictated by
the pitch diameter of the smaller pulley in the drive
system (typically the motor pulley in these units). Do not
install a replacement motor pulley with a smaller pitch
diameter than provided on the original factory pulley.
Change fan wheel speed by changing the fixed fan pulley
(larger pitch diameter to reduce wheel speed, smaller
pitch diameter to increase wheel speed) or select a new
system with both pulleys and matching belt(s).
Содержание 580J D17
Страница 80: ...80 APPENDIX IV WIRING DIAGRAMS cont C160041 Fig 72 580J D17 D28 Control Diagram 208 230 3 60 460 575 3 60 ...
Страница 81: ...81 APPENDIX IV WIRING DIAGRAMS cont C160042 Fig 73 580J D17 D28 Power Diagram 208 230 3 60 ...
Страница 82: ...82 APPENDIX IV WIRING DIAGRAMS cont C160043 Fig 74 580J D17 D28 Power Diagram 460 3 60 ...
Страница 83: ...83 APPENDIX IV WIRING DIAGRAMS cont C160044 Fig 75 580J D17 D28 Power Diagram 575 3 60 ...
Страница 84: ...84 APPENDIX IV WIRING DIAGRAMS cont C160050 Fig 76 580J D17 D28 Control Diagram with Perfect Humidity ...
Страница 86: ...86 APPENDIX IV WIRING DIAGRAMS cont C160047 Fig 78 580J D17 D28 Power Diagram 460 3 60 with Perfect Humidity ...
Страница 87: ...87 APPENDIX IV WIRING DIAGRAMS cont C160048 Fig 79 580J D17 D28 Power Diagram 575 3 60 with Perfect Humidity ...
Страница 88: ...88 APPENDIX IV WIRING DIAGRAMS cont C160049 Fig 80 RTU OPEN Wiring Diagram ...
Страница 89: ...89 APPENDIX IV WIRING DIAGRAMS cont C160045 Fig 81 RTU OPEN Wiring Diagram with Perfect Humidity ...
