Bryant LEGACY 580J*20M Series, Installation Instructions Manual

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53
Fig. 64 — EconoMi$er
®
IV Wiring
Step 12 — Adjust Factory- Installed Options
ECONOMI$ER IV OCCUPANCY SWITCH — Refer to
Fig. 64 for general EconoMi$er IV wiring. External occupancy
control is managed through a connection on the Controls Con-
nections Board.
If external occupancy control is desired, connect a time clock
or remotely controlled switch (closed for Occupied, open for
Unoccupied sequence) at terminals marked OCCUPANCY on
CTB. Remove or cut jumper JMP 2 to complete the installation.
Step 13 — Install Accessories —
Available accessories
include:
• Roof curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• LP conversion kit
• Manual outside air damper
• High altitude gas kit
• Flue discharge deflector
• Low ambient controls
• Thermostat/sensor
• Two-position motorized outside air damper
• EconoMi$er2 (without control/for external signal and
integrated barometric relief)
• EconoMi$er IV (with control and integrated barometric
relief)
• Power exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO
2
sensor
• Louvered hail guard
• Phase monitor control
• Winter start kit
Refer to separate installation instructions for information on
installing these accessories.
Step 14 — Check Belt Tension —
Measure the belt span
length as shown in Fig. 65. Calculate the required deflection by
multiplying the belt span length by
1
/
64
. For example, if the belt
span length is 32 inches: 32 x
1
/
64
=
1
/
2
inch deflection.
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 pul-
leys. 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. 65). 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. 66) 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 fin-
ished.
BELT TENSION METHOD — Requires belt tension gauge
that measures tension in belt in units of lbs force (see Fig. 65).
ECONOMIZER 2 POSITION DAMPER
UNIT WITHOUT ECONOMIZER OR
2 POSITION DAMPER