Step 11 - Adjust Factory-Installed Options; Step 12 - Install Accessories; Step 13 - Check Belt Tension - United Technologies Carrier WeatherMaker 50TC A08 Series Installation Instructions Manual

Step 11 — Adjust Factory-Installed Options
SMOKE DETECTORS — Smoke detector(s) will be con-
nected at the Controls Connections Board, at terminals marked
"Smoke Shutdown." Cut jumper JMP 3 when ready to ener-
gize unit.
ECONOMI$ER IV OCCUPANCY SWITCH — Refer
Fig. 129 for general EconoMi$er IV wiring. External occupan-
cy 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 12 — Install Accessories —
sories include:
• Roof Curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• Manual outside air damper
• Two-Position motorized outside air damper
• EconoMi$er IV (with control and integrated barometric
relief)
• EconoMi$er2 (without control/for external signal and
integrated barometric relief)
• Power Exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• Electric Heaters
• Single point kits
• Low Ambient Controls
Economizer
Fig. 129 — EconoMi$er
• Thermostat / Sensors
• CO
• DDC interface (PremierLink controller)
• Louvered hail guard
• Phase monitor control
to
installing these accessories.
Step 13 — Check Belt Tension —
span length as shown in Fig. 130. Calculate the required deflec-
tion by multiplying the belt span length by
the belt span length is 32 inches: 32 x
BELT FORCE — DEFLECTION METHOD — Check the
belt tension with a spring-force belt force deflection gauge
(available from drive belt manufacturer).
Available acces-
front bolts and rear bolt (see Fig. 131) and slide the plate to-
wards the fan (to reduce tension) or away from the fan (to in-
crease tension). Ensure the blower shaft and motor shaft are
parallel to each other (pulleys aligned). Tighten all bolts se-
curely when finished.
77
2 Position Damper
® IV Wiring
sensor
2
Refer to separate installation instructions for information on
1. Place a straightedge along the belt between the two
pulleys. 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. 130). 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
Unit Without Economizer or
2 Position Damper
Measure the belt
/ . For example, if
1
64
1 / = 1 / inch deflection.
64 2