Step 14 - Adjust Factory-Installed Options; Smoke Detectors; Step 15 - Install Accessories; Step 16 - Check Belt Tension - Carrier WeatherExpert 48LC 04 Series Installation Instructions Manual

Step 14 — Adjust Factory-Installed Options

SMOKE DETECTORS

Smoke detector(s) will be connected at the Central Terminal
Board (CTB), at terminals marked "Smoke Shutdown". Re-
move jumper JMP 3 when ready to energize unit.
Step 15 — Install Accessories
Available accessories include:
• Curb
• EconoMi$er ® X (with control)
• EconoMi$er2 (without control/for external signal)
• Power Exhaust
• Differential dry-bulb sensor (EconoMi$er2)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO sensor
2
• Louvered hail guard
• Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories.
Step 16 — Check Belt Tension
Measure the belt span length as shown in Fig. 57. Calculate the re-
quired deflection by multiplying the belt span length by
example, if the belt span length is 32 inches:
32 x 1 / = 1 / -in. deflection.
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. 57). 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. 58) 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.
BELT SMALLEST
CROSS
SECTION DIAMETER
A, AX
B, BX
BELT CONDITION
1 / . For
New
64
Used

BELT TENSION METHOD

Requires belt tension gage that measures tension in belt in units of
lbs force.
MOUNTING
BOLTS (4)
Fig. 58 — 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).
34
BELT DEFLECTION FORCE (LBS)
UNNOTCHED
SHEAVE
BELTS
USED NEW
3.0-3.6 3.7 5.5
3.8-4.8 4.5 6.8
5.0-7.0 5.4 8.0
3.4-4.2 — —
4.4-5.6 5.3 7.9
5.8-8.6 6.3 9.4
Table 1
TENSION FORCE IN BELT (LBS)
100
80
Table 2
Fig. 57 — V-Belt Force Label
BLOWER PULLEY
V-BELT
MOTOR MOUNTING
NOTCHED BELTS
USED NEW
4.1 6.1
5.0 7.4
5.7 8.4
4.9 7.2
7.1 10.5
8.5 12.6
MOTOR
PULLEY
MOTOR
PLATE