16
GKNE-SVX001B-EN
Blower Set Up and Adjustment
Blower Set Up
The drive ratio of the motor and blower sheaves has been
preset at the factory for a temperature rise of 65°F at .2"
W.C. If the unit is to be operated under different static air
flow or pressure requirements, the drive ratio must be
altered by means of the adjustable sheave on the blower
motor.
1. Ensure that all packing material, support blocks, etc
have been removed from the unit.
2. Adjust the blower drive belt tension by means of the
two tension bolts on the blower motor base. When
proper tension has been achieved, the mid-point
deflection of the belt will be 3/4" when subjected to a 5
lb. force.
3. Recheck all electrical connections.
4. When power is applied, ensure that the motor and
blower are rotating in a counter clockwise direction
when viewed from the drive side.
5. Measure the current draw of the motor
CAUTION
The "at speed" current draw of the motor must never
exceed that specified on the motor rating plate or
severe damage to the motor will result!
Blower Drive Adjustment
WARNING
Never attempt to adjust the drive belt without first
disconnecting all electrical power to the unit or severe
personal injury may result!
1. Remove the belt guard and loosen the belt tension
bolts on the blower motor base.
2. Loosen the set screw on the adjustable half of the
motor sheave. To increase the blower speed, turn the
adjustable half of the sheave clockwise, counter
clockwise to slow the blower. Retighten the set screw.
3. Realign the blower and motor sheaves if necessary.
4. Adjust the belt tension as specified in the BLOWER SET
UP section under step 2.
5. Replace the belt guard.
WARNING
Never operate the unit without the belt guard in place
of severe personal injury may result!
6. Check that the air flow of the unit, the rpm and current
draw of the blower motor and the temperature rise are
within the limits specified in
Table 1
, the blower motor
rating plate and the rating plate on the unit,
respectively (also see
Figure 6.
Motor and blower assembly *
* PART DESCRIPTION
A. Blower Housing
B. Blower Wheel
C. Blower Shaft
D. Bearings
E. Drive Pulley
F. Driven Pulley
G. V-Belt
H. Blower Motor
I. Blower Housing Support (LH)
J. Blower Housing Support (RH)
* NOTICE: THE BLOWER ASSEMBLY
FOR THE 100/250 UNITS CONSISTS OF
1 WHEEL, 1 HOUSING, 1 SHAFT AND
2 BEARINGS. FOR 300/400 UNITS THE
BLOWER ASSEMBLY CONSISTS OF 2
WHEELS, 2 HOUSINGS, 1 SHAFT AND
3 BEARINGS.
CAUTION
Never operate the unit beyond the specified limits or
severe damage to, and or premature failure of, the unit
will result!
