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Belt Tensioner Add-On Kit
for 48" Advantage Fan
FH2417
Aerotech, A Munters Company
4215 Legion Dr. Mason, MI 48854-1036 USA
(517) 676-7070 Fax (517) 676-7078
FORM: QM1210
January 2004
Page 1 of 3
INSTALLATION INSTRUCTIONS
Disassembling the fan. (Keep all fasteners, as they will be reused, unless otherwise
noted.)
1) Remove the shutter or inlet guard from the fan. See Figure 1A.
2) Remove the existing drive belt.
3) Disconnect the electrical power leads from the motor and remove the motor from
the motor base. See Figure 1B. Remove motor base from the struts. See Figure 1C.
WARNING
!
High Voltage,
disconnect power
before servicing.
AT481Z1 without
Tensioner
AT481Z1 with
Tensioner
Figure 1B
Motor Base
Existing
Fasteners
(to be
kept)
Existing
Drive Belt
Belt Tensioner Kit (FH2417) includes:
1 - Motor Base Bracket
1 - V-Belt A-Section Aramid (FH1410)
1 - Tensioner Assembly
1-
3
/8" x 1.75 Bolt, SS
1-
3
/8" Flat Washer
built from July 11, 2003—Sept. 15, 2003
Figure 1C
Motor Base
Motor
Figure 1A
Inlet (shutter side)
Aerotech, A Munters Company
4215 Legion Dr. Mason, MI 48854-1036 USA
(517) 676-7070 Fax (517) 676-7078
FORM: QM1210
January 2004
Page 2 of 3
4) Fasten the new motor base to the struts using fasteners removed in Step 3. The flanges on the base point
downward and the front flange will be toward you. See Figure 2. Insert bolts through struts and then through
the motor base. Place flat washer over bolt against motor base and finger tighten flange nut. See Figure 2.
After all bolts are inserted, tighten all nuts tight.
5) Install motor, removed in Step 3, to motor base, insuring the motor support is square with the motor base.
Using straight edge, align motor pulley with propeller pulley and tighten motor bolts.
Figure 3
3
/8" x 1.75
Bolt
3
/8" Flat
Washer
Tensioner
Left Hole
Idler
Propeller
Pulley
Motor
Pulley
Figure 2
Motor Base
Bolt
removed
in Step 3
Nut and Washer
6) Install the belt tensioner finger tight, in the left hole of the motor base as viewed from the inlet (shutter side) of
the fan. See Figure 3.
7) Install new belt on pulleys. Start by placing belt over motor pulley, then over idler pulley and rotate around
bottom of propeller pulley. See Figure 3.
Aerotech, A Munters Company
4215 Legion Dr. Mason, MI 48854-1036 USA
(517) 676-7070 Fax (517) 676-7078
FORM: QM1210
January 2004
Page 3 of 3
Drive Alignment
1) Use a straight edge to check the alignment of the pulleys. See Figure 5.
2) Check alignment of belt on idler pulley, it should be centered on the idler pulley. The belt tensioner’s idler
pulley is fixed in position, therefore, alignment must be obtained by adjusting the motor and propeller pulleys.
3) If an adjustment is needed, remove the belt, then loosen the set screws in the pulleys and move them as
necessary to achieve proper alignment.
4) Remember to tighten the pulley set screws after making an adjustment.
5) Drive alignment is very important for long belt life and proper operation.
Installation now complete, reconnect power to the motor and install the shutter or inlet guard.
Mark on Base
Second Mark on
Tensioner Arm
Figure 4
8) To torque the belt tensioner to the proper setting place a
15
/16" wrench onto the
15
/16" hex on the tensioner.
See Figure 4. Turn wrench counterclockwise until the single mark on one half of the belt tensioner is aligned
half way between marks 2 and 3 on the opposite half of the tensioner. See Figure 4. Hold tensioner at this
setting and tighten the
3
/8" x 1
3
/4" bolt fastening the tensioner to the motor base. Fasten tensioner
3
/8" bolt to
40ft. lbs of torque. See Figure 4.
Figure 5
Idler Pulley
Propeller
Pulley
Straight Edge
Belt
Motor
Pulley
/