Lennox KGC Series Unit Information page 19

TO INCREASE BELT TENSION
1- Loosen four bolts securing motor mounting base
to frame.
2- Turn adjusting bolt to the right, or clockwise, to
move the motor away from the blower housing.
IMPORTANT - Gap between end of frame and motor
allel along gap.
3- Tighten four bolts securing motor mounting base
to frame.
4- Relieve tension on two adjusting bolts.
GAP BETWEEN
EDGES SHOULD BE
PARALLEL ON BOTH
ENDS BEFORE
TIGHTENING MOTOR
MOUNTING BASE IN
PLACE
D-Determining Unit CFM
IMPORTANT - Units equipped with an inverter are facto-
ryset to run the blower at full speed when there is a blower
(G) demand without a heating or cooling demand. Use the
following procedure to adjust motor pulley to deliver the
full load cooling or heating CFM. See Inverter Start-Up
section to set blower CFM for all modes once the motor
pulley is set.
1 - The following measurements must be made with
a dry indoor coil. Run blower without a cooling
demand. Measure the indoor blower shaft RPM.
Air filters must be in place when measurements are
taken.
2 - With all access panels in place, measure static
pressure external to unit (from supply to return).
Blower performance data is based on static pressure
readings taken in locations shown in FIGURE 8.
Note - Static pressure readings can vary if not taken
where shown.
3 - Refer to BLOWER DATA (table of contents) and use
static pressure and RPM readings to determine unit
CFM.
STANDARD BLOWER ASSEMBLY
MOTOR MOUNTING
BASE
BELT ADJUSTING BOLTS
- TURN CLOCKWISE
TO TIGHTEN BELT
REMOVE TWO SCREWS
TO COMPLETELY SLIDE
BLOWER OUT OF UNIT
REMOVE TWO SCREWS ON EACH
SIDE TO SLIDE FRAME PARTIALLY
OUT OF UNIT FOR SERVICE ACCESS
BLOWER
HOUSING
MOTOR
LOOSEN BEFORE
ADJUSTING BELT TENSION
(TWO EACH SIDE)
FIGURE 7
4 - The blower RPM can be adjusted at the motor pulley.
Loosen Allen screw and turn adjustable pulley
clockwise to increase CFM. Turn counterclockwise
to decrease CFM. See FIGURE 7. Do not exceed
minimum and maximum number of pulley turns as
shown in TABLE 1.
MINIMUM AND MAXIMUM PULLEY ADJUSTMENT
Belt
A Section
B Section
*No minimum number of turns open when B belt is used on pulleys 6"
O.D. or larger.
E-Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if
proper pulley alignment and belt tension are maintained.
Tension new belts after a 24-48 hour period of operation.
This will allow belt to stretch and seat in the pulley grooves.
Make sure blower and motor pulleys are aligned as shown
in FIGURE 9.
Page 19
SIDE VIEW
MOTOR
ALLEN
SCREW
PULLEY
BLOWER
FRAME
TABLE 1
Minimum Turns Maximum Turns
Open
0
1*
Open
5
6