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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$ER IV OCCUPANCY SWITCH — Refer
to Fig. 97 for general EconoMi$er IV wiring. External occu-
pancy 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 —
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$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• Electric Heaters
• Single point kits
Economizer
Fig. 97 — EconoMi$er
Available accessories
64
2 Position Damper
IV Wiring
®
• Low Ambient Controls
• Thermostat / Sensors
• CO
sensor
2
• Louvered hail guard
• Phase monitor control
Refer to separate installation instructions for information on
installing these accessories.
Step 13 — Check Belt Tension —
span length as shown in Fig. 98. 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).
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. 98). 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. 99) 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.
Unit Without Economizer or
2 Position Damper
Measure
the
belt
/
. For example, if
1
64
1
/
=
1
/
inch deflection.
64
2
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