5
IMH IO&M
B51221-002
2 Speed, 2 Winding, 3 Phase
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T1
2
T
11
L
3
Line
L
3
To reverse: High Speed-interchange leads T
11
and T
12
. Low Speed-
interchange leads T
1
and T
2
. Both Speeds-interchange any 2 line
leads.
Typical Damper Motor Schematic
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Transformer**
Transformer**
L3
L2
L1
For 3 Phase, damper motor voltage should be the same between L
1
and L
2
. For single phase application, disregard L
3
. *Damper motors
may be available in 115,230 and 460 volt models. The damper motor
nameplate voltage should be verified prior to connection. **A trans
-
former may be provided in some installations to correct the damper
motor voltage to the specified voltage.
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pul
-
ley setscrew and by moving the motor pulley on the motor
shaft.
Figure 4
indicates where to measure the allowable gap
for the drive alignment tolerance. All contact points (indi
-
cated by WXYZ) are to have a gap less than the tolerance
shown in the
Tolerance
table.
When the pulleys are not the same width, the allowable
gap must be adjusted by half of the difference in width.
Figure 5
illustrates using a carpenter’s square to adjust the
position of the motor pulley until the belt is parallel to the
longer leg of the square.
Tolerance
Center
Distance
Max.
Gap
Up thru 12” 1/16”
12” up
through 48
1/8”
Over 48
1/4”
OFFSET
ANGULAR
OFFSET/ANGULAR
A
W
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP
GAP
Final Installation Steps
1.
Inspect fasteners and setscrews (particularly fan mount-
ing and bearing fasteners) and tighten according to the
recommended torque shown in the table
Recommended
Torque for Setscrews/Bolts
.
2. Inspect for correct voltage with voltmeter.
3. Ensure all accessories are installed.
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2.
Ensure fasteners and setscrews, particularly those used for
mounting the fan, are tightened.
3. Inspect belt tension and pulley alignment.
4. Inspect belt tension on energy wheel drive belt.
5. Inspect motor wiring.
6. Ensure belt touches only the pulley.
7. Ensure fan and ductwork are clean and free of debris.
8. Inspect wheel-to-inlet clearance. The correct wheel-to-inlet
clearance is critical to proper fan performance.
9. Close and secure all access doors.
10. Restore power to the fan.
Start-Up
Turn the fan on. In variable
speed units,set the fan to its
lowest speed and inspect for
the following:
•
Direction of rotation.
•
Excessive vibration.
•
Unusual noise.
•
Bearing noise.
• Improper belt alignment or
tension (listen for squealing).
• Improper motor amperage or
voltage.
NOTICE! If a problem is discovered, immediate-
ly shut off the fan. Lock out all electrical power
and check for the cause of the trouble. Refer to
Troubleshooting
.
Recommended Torque for Setscrews/Bolts (in/lb)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Min.
Max.
Size
Wrench
Torque
No. 10
3/32”
28
33
3/8”-16
240
1/4”
1/8”
66
80
1/2”-13
600
5/16”
5/32”
126
156
5/8”-11
1200
3/8”
3/16”
228
275
3/4”-10
2100
7/16”
7/32”
348
384
7/8”-9
2040
1/2”
1/4”
504
600
1”-8
3000
5/8"
5/16"
1104
1200
1-1/8"-7
4200
3/4"
3/8"
1440
1800
1-1/4"-7
6000
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as
per the
Conditions Chart
.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts.
Adjust and tighten as necessary.
Figure 4
