RT-SVX073A-EN
151
frame with the screwdriver.
5. Reinstall forked segment retainer(s)
Note: Only applies when there is an adjacent segment
in place.
6. Close each segment retainer latch under the segment
retaining catch.
7. Rotate the wheel and repeat this sequence with the
remaining segments.
Removing and replacing the segments with a spare set
can be accomplished more quickly. Remove the dirty
segment, replace it with a clean segment, then move to
the next segment.
Filtration
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Galvanized steel permanent filters are provided to prevent
debris from entering the energy wheel section. The return
air filters are mounted in a filter rack underneath the energy
recovery wheel, and are accessible from either side by
means of the double access doors. The outside air filter
rack is attached to the energy recovery cassette. Use the
unit filter / evaporator coil access doors to service the
energy recovery outside air filters.
1. Disconnect all electrical power.
2. Remove all filter media from the vertical filter rack
providing air filtration for the unit evaporator coil.
3. Remove the sheet metal screws in the hinged access
panel beneath the bypass damper assembly.
4. Rotate the access panel downwards.
5. Reach in past the damper wall to access the flexible
filter puller(s). Pull them towards the evaporator coil
enough to reach the second filter in each slot of the
filter rack. Refer to Table 54, p. 151 for filter
information.
Table 54. ERW Filter Information
Galvanized
Steel Filter
Info
90-105 Ton
Low CFM
ERW Units
(in.)
90-150 Ton
Low CFM
ERW Units
(in.)
90-150 Ton
Standard
CFM ERW
Units (in.)
RA Filters
(size, number)
24x24x1, 10 24x24x1, 10 24x24x1, 10
FA Filters (size,
number
224x24x1, 8 24x24x1, 6 24x24x1, 8
12x24x1, 2
Note: Inspect these filters monthly and clean them as
necessary.
Bearing and Motor Lubrication
The wheel drive motor and wheel support shaft bearings
are permanently lubricated and no further lubrication is
necessary.
Service and Repair
Drive Belt Replacement
The drive belt is a urethane stretch belt designed to provide
constant tension throughout the life of the belt. No periodic
adjustment is required. Inspect the belt annually for proper
tracking and tension. A properly tensioned belt will turn the
wheel immediately, with no visible slippage, when power is
applied.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
WARNING
Risk of Energy Wheel Collapsing!
Failure to follow instructions below could cause the
energy wheel to collapse under the technician’s
weight which could result in severe injury.
Before laying across the energy wheel, add extra
support by placing a rigid board across the span of
the energy wheel cassette.
1. Disconnect all electrical power.
2. Confirm the model number on the belt replacement kit
matches the model number on the label by the motor
pulley. Remove all remnants of the old belt.
3. Uncoil the belt as necessary. The belt must not twist
when being feed around the wheel rim.
4. At a location near the motor pulley, tape the hook end
of the belt to the wheel rim, see Figure 98, p. 149 and
Figure 102, p. 152. The tape should cover the hook
and belt, see Figure 100, p. 152.
5. Manually rotate the wheel clockwise while feeding the
belt onto the wheel rim, taking care that the belt does
not twist.
Note: If for any reason the belt were to become flipped
or twisted 90° in either direction, belt failure will
be imminent.
6. Upon feeding the belt completely through, remove the
tape and join the link with the belt positioned around the
wheel rim, see Figure 101, p. 152. Keep light tension
Unit Startup
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