Smoke Detectors; Belt Force - Deflection Method; Belt Tension Method - Carrier WeatherExpert Puron 50LC 08 Series Installation Instructions Manual

Step 11 — 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 12 — Install Accessories
Available 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
• CO sensor
2
• Temperature and Humidity sensors
• Louvered hail guard
• Phase monitor control
• Electric Heaters
• Single Point kits
• Outdoor coil protector grille
• Differential enthalpy sensor
Refer to separate installation instructions for information on in-
stalling these accessories. See Price Pages for a complete list of
field-installed accessories.
Step 13 — Check Belt Tension
Measure the belt span length as shown in Fig. 73. 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. 73). 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. 74) 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.
SET
SCREW
TORQUE ALL SHEAVE SET SCREWS TO 110-130 in. lbs
BELT SMALLEST
CROSS
SECTION DIAMETER
A, AX
B, BX
BELT CONDITION
New
Used
/ . For

BELT TENSION METHOD

1
64
Requires belt tension gage that measures tension in belt in units of
lbs force.
MOUNTING
BOLTS (4)
Fig. 74 — 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 instruc-
tions. Download the latest versions from HVAC Partners
(www.hvacpartners.com).
60
BELT DEFLECTION FORCE - SEE TABLE 1
DEFLECTION = BELT SPAN
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. 73 — V-Belt Force Label
BLOWER PULLEY
V-BELT
MOTOR MOUNTING
64
STRAIGHT
EDGE
SET
SCREW
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