61
Step 11 — Adjust Factory -- Installed Options
Smoke Detectors —
Smoke detect or(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 field installed accessories include:
Roof Curb (must be installed before unit)
Thru--base c onnection kit (must be installed before unit
is set on curb)
Electric heaters a nd single--point connection kits
EconoMi$e r
R
X (with control)
Power Exhaust
Outdoor enthalpy sensor
Differential enthalpy sensor
CO
2
sensor
Tempera ture and Humidity sensors
Louvere d hail guard
Phase monitor control
Refer to separate installation instructions for information
on installing 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. 63.
Calculate the required deflection by multiplying the belt
span length by 1/64. For example , if the belt span length
is32inches:32x1/64=1/2inchdeflection.
Belt Force -- Deflection Method --
Check the belt tension with a spring--force belt force
deflection gauge.
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. 63). Place the large O--ring at that point.
3. Press the te nsion checker downward on the belt until
the large O--ring is at the bottom of the stra ightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate
front bolts and rear bolt (see Fig. 64) and sli ding 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.
C160146
Fig. 63 -- V--Belt Force Label
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