Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480188-01
Printed in U.S.A.
Form 48KC-4-6-03SI
Pg 42
11-18
Replaces: 48KC-4-6-02SI
© Carrier Corporation 2018
Step 16 — Check Belt Tension
Measure the belt span length as shown in Fig. 59. Calculate
the required deflection by multiplying the belt span length by
1
/
64
. For example, if the belt span length is 32 inches: 32 x
1
/
64
=
1
/
2
inch deflection.
BELT FORCE — DEFLECTION METHOD — Check the
belt tension with a spring-force belt force deflection gauge
(available from drive belt manufacturer).
1. Place a straightedge along the belt between the two pul-
leys. Measure the distance between the motor shaft and
the blower shaft.
2. Set the tension gauge to the desired tension (see Table 1 in
Fig. 59). Place the large O-ring at that point.
3. Press the tension checker downward on the belt until the
large O-ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate front
bolts and rear bolt (see Fig. 60) and slide the plate towards the
fan (to reduce tension) or away from the fan (to increase ten-
sion). Ensure the blower shaft and motor shaft are parallel to
each other (pulleys aligned). Tighten all bolts securely when
finished.
Fig. 59 — V-Belt Force Label
BELT TENSION METHOD — Requires belt tension gauge
that measures tension in belt in units of lbs force.
Fig. 60 — Belt Drive Motor Mounting
Table 1
Table 2
BELT
CROSS
SECTION
SMALLEST
SHEAVE
DIAMETER
BELT DEFLECTION FORCE (LBS)
UNNOTCHED
BELTS
NOTCHED BELTS
USED
NEW
USED
NEW
A, AX
3.0-3.6
3.7
5.5
4.1
6.1
3.8-4.8
4.5
6.8
5.0
7.4
5.0-7.0
5.4
8.0
5.7
8.4
B, BX
3.4-4.2
—
—
4.9
7.2
4.4-5.6
5.3
7.9
7.1
10.5
5.8-8.6
6.3
9.4
8.5
12.6
BELT CONDITION
TENSION FORCE IN BELT (LBS)
New
100
Used
80
BLOWER PULLEY
V-BELT
MOTOR
PULLEY
MOTOR
MOTOR MOUNTING
PLATE
MOUNTING
BOLTS (4)
Summary of Contents for WeatherMaker 48KC Series
Page 4: ...4 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing cont ...
Page 23: ...23 Fig 41 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 25: ...25 Fig 43 Typical Control Wiring Diagram Electro Mechanical with W7212 ...
Page 26: ...26 Fig 44 Typical 48KC 04 06 Power Wiring Diagram 208 230 3 60 Unit Shown ...