Smoke Detectors; Economi$Er Iv Occupancy Switch; Belt Tension Method; Belt Force - Deflection Method - Carrier WeatherMaker 50KCQ A04 Series Installation Instructions Manual

Step 12 — Adjust Factory-Installed Options

SMOKE DETECTORS

Smoke detector(s) will be connected at the Controls Connec-
tions Board, at terminals marked "Smoke Shutdown". Cut
jumper JMP 3 when ready to energize unit.

ECONOMI$ER IV OCCUPANCY SWITCH

Refer to Fig. 56 for general EconoMi$er IV wiring. External
occupancy control is managed through a connection on the
Controls Connections Board.
If external occupancy control is desired, connect a time clock
or remotely controlled switch (closed for Occupied, open for
Unoccupied sequence) at terminals marked OCCUPANCY.
Cut jumper JMP 2 to complete the installation.
Step 13 — Install Accessories
Available accessories include:
• Curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• Electric heaters and single-point connection kits
• Manual outside air damper
• Two-Position motorized outside air damper
• EconoMi$er IV (with control)
• EconoMi$er2 (without control/for external signal)
• Power Exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO sensor
2
• DDC interface (PremierLink™)
• Louvered hail guard
®
• Motormaster head pressure controls
• Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories.
Step 14 — Check Belt Tension
Measure the belt span length as shown in Fig. 57. Calculate the
required deflection by multiplying the belt span length by
For example, if the belt span length is 32 inches:
1 1
32 x / = / -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 ten-
sion). Ensure the blower shaft and motor shaft are parallel to
each other (pulleys aligned). Tighten all bolts securely when
finished.
© 2019 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500213-01 Printed in U.S.A. Form 50KCQ-4-6-02SI Rev. A
SET
SCREW
TORQUE ALL SHEAVE SET SCREWS TO 110-130 in. lbs
Table 1
BELT SMALLEST
CROSS SHEAVE
SECTION DIAMETER
A, AX
B, BX
Table 2
BELT CONDITION
New
Used
Fig. 57 — V-Belt Force Label

BELT TENSION METHOD

Requires belt tension gage that measures tension in belt in units
of lbs force.
1
/ .
64
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).
BELT DEFLECTION FORCE - SEE TABLE 1
DEFLECTION = BELT SPAN
BELT DEFLECTION FORCE (LBS)
Unnotched 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
TENSION FORCE IN BELT (LBS)
100
80
BLOWER PULLEY
V-BELT
MOTOR MOUNTING
Pg 42 11-19 Replaces: 50KCQ-4-6-01SI
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