Sterling TC - Manual (Page 10)

10
Never operate the unit beyond
the specified limits or severe damage to, and or
premature failure of, the unit will result!
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 fl ow 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
defl ection 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.
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!
* 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.
Figure 5 - Motor & Blower Assembly *
* PART DESCRIPTION
A. Blower Housing and Wheel
C. Blower Shaft
D. Bearings
E. Drive Pulley
F. Driven Pulley
G. V-Belt
H. Blower Motor
I. Blower Housing Support (LH)
H. Blower Housing Support (RH)
BLOWER DRIVE ADJUSTMENT
Never attempt to adjust the drive
belt without fi rst 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 specifi ed in the BLOWER
SET UP section under step 2.
5. Replace the belt guard.
Never operate the unit without
the belt guard in place or severe personal injury
may result!
6. Check that the air flow of the unit, the r pm
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 Motor Data
on page 11).
BLOWER SET UP AND ADJUSTMENT
D9000