Smoke Detectors; Belt Force - Deflection Method; Belt Tension Method - Carrier WeatherExpert 48LC 07 Series Installation Instructions Manual

Step 13 — Adjust Factory-Installed Options

SMOKE DETECTORS

Smoke detector(s) will be connected at the Integrated Staging
Control (ISC) board, at terminals marked "Smoke Shutdown".
Remove jumper JMP 3 when ready to energize unit.
Step 14 — Install Accessories
Available field-installed accessories include:
• Roof Curb (must be installed before unit)
• Thru-base connection kit (must be installed before unit is
set on curb)
• EconoMi$er ® X (with control)
• Power Exhaust
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO sensor
2
• Temperature and Humidity sensors
• Louvered hail guard
• Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories. See Price Pages for a complete list of
field-installed accessories.
Step 15 — Check Belt Tension
Measure the belt span length as shown in Fig. 68. Calculate the re-
quired deflection by multiplying the belt span length by
example, if the belt span length is 32 inches:
32 x / = / -in. deflection.
1 1
64 2
BELT FORCE — DEFLECTION METHOD
Check the belt tension with a spring-force belt force deflection
gage (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 gage to the desired tension (see Table 1 in
Fig. 68). 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. 69) and slide the plate towards the fan (to
reduce tension) or away from the fan (to increase tension). Ensure
the blower shaft and motor shaft are parallel to each other (pulleys
aligned). Tighten all bolts securely when finished.
© Carrier Corporation 2019
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480218-01
1 /
64
Printed in U.S.A.
BELT SMALLEST
CROSS SHEAVE
SECTION DIAMETER
3.0-3.6
A, AX 3.8-4.8
5.0-7.0
3.4-4.2
B, BX 4.4-5.6
5.8-8.6
BELT CONDITION
New
Used
. For
Fig. 68 — V-Belt Force Label

BELT TENSION METHOD

Requires belt tension gage that measures tension in belt in units of
lbs force.
MOUNTING
BOLTS (4)
Fig. 69 — Belt Drive Motor Mounting
Pre-Start and Start-Up
This completes the mechanical installation of the unit. Refer to
the unit's Service Manual for detailed Pre-Start and Start-Up
instructions. Download the latest versions from HVAC Part-
ners (www.hvacpartners.com).
Form 48LC-7-06SI Pg 54
BELT DEFLECTION FORCE (LBS)
UNNOTCHED
NOTCHED BELTS
BELTS
USED NEW USED
3.7 5.5 4.1
4.5 6.8 5.0
5.4 8.0 5.7
— — 4.9
5.3 7.9 7.1
6.3 9.4 8.5
Table 1
TENSION FORCE IN BELT (LBS)
100
80
Table 2
BLOWER PULLEY
V-BELT
MOTOR
PULLEY
MOTOR
MOTOR MOUNTING
PLATE
6-19 Replaces: 48LC-7-05SI
NEW
6.1
7.4
8.4
7.2
10.5
12.6