—
24
—
IV. INDOOR FAN, 542J180 UNITS
A. Performance Adjustment
Fan motor pulleys are factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 2 carriage bolts in the mounting
base. Install jacking bolt and plate under motor base
(bolt and plate are shipped in installer’s packet).
Using bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tighten-
ing the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (See Fig. 34).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1. See
Table 9 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub
and tighten setscrew. (See Table 1 for speed change
for each full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjust-
ment section below.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting plate.
B. Service and Replacement (see Fig. 36)
The 542J180 units use a fan motor mounting system that
features a slide-out motor mounting plate. To replace or ser-
vice the motor, slide out the bracket.
1. Remove the indoor-fan access panel and the heating
control access panel.
2. Remove the center post (located between the indoor
fan and heating control access panels) and all screws
securing it.
3. Loosen nuts on the two carriage bolts in the motor
mounting base.
4. Using jacking bolt under motor base, raise motor to
top of slide and remove belt. Secure motor in this
position by tightening the nuts on the carriage bolts.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor sup-
port channel that interfere with the motor slide path.
9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4
mounting bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
13. Check and adjust belt tension as necessary.
V. BELT TENSION ADJUSTMENT
To adjust belt tension:
1. Loosen fan motor bolts.
2. a. Size 150 units:
Move motor mounting plate up or down for proper
belt tension (
1
/
2
in. deflection with one finger).
b. Size 180 units:
Turn motor jacking bolt to move motor mounting
plate up or down for proper belt tension (
3
/
8
in.
deflection at midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure
motor in fixed position.
VI. OUTDOOR-FAN ADJUSTMENT (Fig. 37)
1. Turn off unit power supply.
2. Remove access panel(s) closest to the fan to be
adjusted.
3. Loosen fan hub setscrews.
4. Adjust the fan height on the shaft using a straight-
edge placed across the fan orifice.
5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
VII. POWER FAILURE
Dampers have a spring return. In event of power failure,
dampers will return to fully closed position until power is
restored. Do not manually operate damper motor.
Fig. 35 — 542J150 Indoor-Fan Motor Section
Summary of Contents for DURAPAC PLUS SERIES 542J
Page 27: ... 27 Fig 40 Typical Wiring Diagram 542J150 208 230 3 60 V Shown ...
Page 28: ... 28 Fig 41 Typical Component Arrangement 542J150 208 230 3 60 V Shown ...
Page 33: ... 33 Fig 44 Troubleshooting Chart Heating Cycle ODT Outdoor Temperature ...
Page 34: ... 34 Fig 45 Troubleshooting Chart Cooling Cycle ...
Page 38: ...Copyright 2006 Bryant Heating Cooling Systems Printed in U S A CATALOG NO 5354 203 ...
Page 39: ......
