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Step 12 — 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$ER IV OCCUPANCY SWITCH — Refer
Fig. 89 for general EconoMi$er IV wiring. External occupancy
control is managed through a connection on the Controls Con-
nections 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 —
sories include:
• Roof Curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• LP conversion kit
• Flue discharge deflector
• 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$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO
sensor
2
• DDC interface (PremierLink controller)
Economizer
Fig. 89 — EconoMi$er
• Louvered hail guard
• Motormaster
• Phase monitor control
• Energy Recovery Ventilator (ERV)
installing these accessories.
to
Step 14 — Check Belt Tension —
span length as shown in Fig. 90. 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. 91) 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.
61
2 Position Damper
®
IV Wiring
®
head pressure controls
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. 90). 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
1
/
. For example, if
64
/
=
/
inch deflection.
1
1
64
2
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