Belt Replacement
1 .
Obtain access to the pulley side bearing access plate
and remove two retaining screws.
2 .
Using a hexagonal wrench, loosen the screw in the
bearing lock collar.
3 .
Using a light hammer and drift, tap collar in the direction of
wheel rotation to unlock collar. Remover collar.
4 .
Using a socket wrench with extension, remove two nuts
which secure bearing housing to the bearing support
beam .
5 .
Slide bearing from shaft.
6 .
Using a wrench, remove the diameter seal retaining
screws. Remove diameter seals from bearing beam.
7 .
Form a small loop on the belt and pass it through the
hole in the bearing support beam. Grasp the belt at the
wheel hub and pull the entire belt down. Loop the trailing
edge of the belt over the shaft.
8 .
Install the new belt around the wheel and pulley.
9 .
Reinstall the bearing onto the wheel shaft, being careful
to engage the two locating pins into the holes in the
bearing support beam. Secure the bearing with two self
locking nuts.
10 .
Reinstall the diameter seals and tighten retaining screws.
See
Diameter Seal Adjustment on page 96
.
11 .
Reinstall bearing locking collar. Rotate collar by hand
in the direction the wheel rotates according to label on
wheel casset. Lock in position by tapping pin hole with
hammer and drift. Secure in position with set screw
12 .
Reinstall bearing access cover with two screws
13 .
Apply power and ensure wheel rotated freely.
Figure 94: Belt Replacement
Troubleshooting
The following table may be used as a quick-reference for
identifying common symptoms and possible causes related to
the recovery wheel.
Table 34: Energy Recovery Wheel Troubleshooting
Symptom
Cause
Inadequate
Wheel
Performance
Check wheel rotation speed (see
).
Check for wheel integrity and adjust seals or replace worn
Energy Recovery Wheel Design on page 45
and
).
Check entering air conditions and compare to design (see
“Energy Recovery Wheel” on page 67).
Check ducting for leakage and fix any leaks.
Check media for dirt and clean per cleaning instructions
(see
and
).
Improper
Wheel
Rotation
Check drive belts for engagement with sheave.
Check drive motor.
Check drive motor wiring for proper voltage.
Check VFD programming (provided with optional frost
protection).
High
Pressure
Drop
Check air flow and compare to design.
Check filters and clean/replace as necessary.
Check media for plugging and clean per cleaning
instructions (see
Segment Installation & Replacement
).
Noise
Check seals and adjust as necessary.
Check the bearings for source of noise.
Check the belt for slippage (see
).
Wheel Will Not
Operate
Check all electrical connections. If MicroTech II controls
are provided, make sure the building pressure is above
setpoint such that the EAF turns on. The wheel does not
operate unless the EAF is on (see
).
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
110
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