Page 1
Installation
Operation
Maintenance
CDQ™
Desiccant Wheels
for Climate Changer™ Air Handlers
Part No. X39641 062010
June 2006 CDQ-SVX01A-EN
Page 2
NOTICE:
Warnings and Cautions appear at appropriate sections throughout this
manual. Read these carefully.
WARNING
...indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
...indicates a potentially hazardous sit uation which, if not a voided, ma y result
in minor or moderate injury. It may also be used to alert against unsafe
practices.
CAUTION
...indicates a situation that may r esult in equipment or property-damage-only
accidents.
© 2007 Trane All rights reserved
Page 3
Introduction
Use this manual to install, startup,
operate, and maintain the CDQ
desiccant wheel module for Trane
Climate Changer™ air handlers.
Carefully review the procedures
discussed in this manual to minimize
installation and startup difficulties.
The startup and adjustment
procedures discussed in this manual
should be done by qualified,
experienced HVAC technicians.
Your personal safety and the proper
operation of this machine depend
upon the strict observance of these
precautions.
Product Information
Trane CDQ™ (Cool, Dry, Quiet)
desiccant dehumidification wheel is
a water vapor transfer tool. The
T rane CDQ™ desiccant wh eel is used
to enhance the dehumidification
performance of a traditional cooling
coil. The wheel is configured in
series with the coil such that the
“regeneration” side of the wheel is
located upstream of the coil and the
“process” side of the wheel is
located downstream of the cooling
coil. The wheel recirculates the water
vapor trapped downstream of the
cooling coil back into the air
upstream of the coil where the coil
removes it through condensation.
This process is accomplished
without the need for a second
regeneration air stream. The addition
of the CDQ desiccant wheel to the
system enhances the
dehumidification performance of the
traditional cooling coil.
Protecting the
Environment
World en vironmental scientists have
concluded, based on the best
currently available evidence, that
ozone in our upper atmosphere is
being reduced due to the release of
CFC (chlorofluorocarbon) fully
halogenated compounds.
Trane urges that all HVAC service
technicians working on Trane
equipment, or any manufacturer’s
products, make every effort to
eliminate, if possible, or vigorously
reduce the emission of CFC, HCFC
(halocarbon that contains fluorine,
chlorine, carbon, and hydrogen), and
HFC (halocarbon that contains only
fluorine, carbon, and hydrogen)
refrigerants to the atmosphere
resulting from installation,
operation, routine maintenance, or
major service on this equipment.
Always act in a responsible manner
to conserve refrigerants for
continued use even when acceptable
alternatives are available.
Refrigerant used in any type of airconditioning or refrigerating
equipment should be recovered for
reuse, recovered and/or recycled for
reuse, reprocessed (reclaimed), or
properly destroyed, whenever it is
removed from equipment. Never
release it to the atmosphere!
CDQ-SVX01A-EN 3
Page 4
Contents
Contents
Introduction
Product Information........................................................3
Protecting the Environment...........................................3
General Information
Operating Environment..................................................5
Controls ...........................................................................5
Ultraviolet (UV) Lights....................................................6
Operation
CDQ Wheel Startup.........................................................7
Wiring
CDQ Desiccant Wheel Cassette .....................................8
Routine Maintenance
Cleaning the Desiccant Wheel....... ................................9
Cleaning the Motor.......................................................10
Cleaning the Module ....................................................10
Bearing and Motor Lubrication....................................10
Drive Belt Tension.........................................................10
Service and Repair
Procedure for Internal Bearing Replacement.............11
Procedure for External Bearing Replacement............14
Drive Belt Adjustment/Replacement...........................16
Seal Adjustment............................................................16
Drive Motor and Pulley Replacement .........................17
Troubleshooting
Probable Causes/Actions..............................................18
4 CDQ-SVX01A-EN
Page 5
General
Information
Operating
Environment
When considering the placement of
the air handlers, it is important to
consider the operating environment.
The acceptable ambient temperature
range for unit operation is -40ºF to
140ºF (-40ºC to 60ºC).
For heating applications, a special
motor may be required to withstand
the higher temperatures. Motors
with Class B insulation are
acceptable for ambient
temperatures up to 104º F, while
motors with Class F insulation can
withstand ambient temperatures to
+140º F (60º C).
Controls
Wiring Sizes and
Connections
There are no penetrations into a
Climate Changer™ air handler for
any field-provided wiring or device.
Before installation, consider overall
unit serviceability and accessibility
before mounting, running wires
(power), making cabinet
penetrations, or mounting any
components to the module cabinet.
Wiring to air handlers must be
provided by the installer and must
comply with all national and local
electrical codes. The fan motor
nameplate includes a wiring
diagram. If there are any questions
concerning the wiring of the motor,
be sure to write down the
information from the motor
nameplate and contact your local
fan motor manufacturer
representative for assistance.
Factory-Mounted Controls
Small items that cannot be factory
mounted will ship inside the control
enclosures. Larger items may ship
inside the fan module.
Note: All control valves ship directly
to the “ship-to address” from the
vendor unless another address is
given on the Trane sales order.
All factory-mounted control systems
(controls that are factory-wired to a
unit controller or termination strip)
ordered without starters or variablefrequency drives (VFDs) are
provided with line to 24 Vac control
transformers mounted and wired in
the auxiliary control panel. The
customer must provide 120 Vac
control power, 50/60Hz, typically
3 amps for unit sizes 3 to 57 and
5 amps for unit sizes 66 to 120. A
dedicated 15-amp circuit is
recommended.
Factory-mounted control systems
ordered with factory-mounted
starters or VFDs are supplied with
line to 24 Vac control transformers.
No additional power wiring is
required.
For a more in-depth understanding
of controls, refer to the following
manuals:
• For factory-configured AH540/
AH541 controllers,
CNT-SVX05B-EN
• For programmable MP580
controllers, CNT-SVP01A-EN
• For hardware installation,
CNT-SVN01A-EN
• For Danfoss VFD,
TR1-SVX10A-EN
• For universal programmable
control modules (UPCMs):
–EMTX-PG-5
– EMTX-IN-22A
CDQ-SVX01A-EN 5
Page 6
General Information
Ultraviolet (UV)
Germicidal
Irradiation Lights
(optional)
The United States Environmental
Protection Agency (EPA) believes
that molds and bacteria inside
buildings have the potential to cause
health problems in sensitive
individuals. If specified, Trane
provides ultraviolet lights (UV-C) as
a factory-engineered and installed
option in select commercial air
handling products for the purpose of
reducing microbiological growth
(mold and bacteria) within the
equipment. When factory provided,
polymer materials that are
susceptible to deterioration by the
UV-C light will be substituted or
shielded from direct exposure to the
light. In addition, UV-C radiation can
damage human tissue, namely eyes
and skin. To reduce the potential for
inadvertent exposure to the lights by
operating and maintenance
personnel, electrical interlocks that
automatically disconnect power to
the lights are provided at all unit
entry points to equipment where
lights are located.
WARNING
Equipment Damage From
Ultraviolet (UV) Lights!
Trane does not recommend field
installation of ultravio let lights in its
air handling equipment for the
intended purp ose of improving
indoor air quality. High intensity Cband ultraviolet light is known to
severely damage polymer (plastic)
materials and poses a personal
safety r isk to anyone exposed t o the
light without proper personal
protectiv e equipm ent (could cau se
damage to eyes and skin). Polymer
materials commonly found in HVAC
equipment that may be susceptible
include insulation on electrical
wiring, fan belts, ther mal insulati on,
various fasteners and bushings.
Degradation of these materials can
result in serious damage to the
equipment.
Trane accepts no responsibility for
the perfor mance or operation of our
air handling equipment in which
ultraviolet devices were installed
outside of the Trane factory.
6 CDQ-SVX01A-EN
Page 7
Operation
WARNING
Rotating Components!
Disconnect all electrical power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Secure drive sheaves to
ensure rotor cannot freewheel.
Failure to secure drive sheaves or
disconnect power before servicing
could result in death or serious
injury.
CAUTION
Do Not Exceed Maximum
Airflow!
Do not exceed the maximum rated
airflow. Excess pressure could
accelerate wear and cause damage
to the wheel.
CDQ Wheel Startup
1. Set seals. See “Seal Adjustment ”
on page 17.
2. With hands and objects away
from moving parts, activate the
wheel and confirm the wheel
rotation. The correct rotation
direction is counter-clockwise as
viewed from the pulley side.
3. Verify rotational speed 8-10
rotations per hour. The wheel
should be a 1/4 turn in 100-150
seconds.
4. If the wheel has difficulty starting,
confirm seals adjustment and belt
tension. See “Seal Adjustment”
on page 17. If belt slips, see
“Drive Belt Adjustment/
Replacement” on page 16.
5. Start and stop the wheel several
times to confirm seal adjustment
and proper belt tracking on the
wheel rim.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result
in death or serious injury.
6. If the wheel has difficulty starting,
turn off the power and inspect for
excessive interference between
the wheel surface and the four
diameter seals. To correct, loosen
the diameter seal adjusting
screws and back the diameter
seals away from the surface of
the wheel. Apply power to
confirm that the wheel rotates
freely. Readjust and tighten the
seals according to instructions in
“Seal Adjustment” on page 17.
7. Damper actuators (if so equipped):
Stroke the actuators to observe
full open and full closure of
dampers. Adjust the actuator and/
or linkage to prevent “overstroking” so excessive pressure is
not placed on the damper at the
full open or full closed position.
CDQ-SVX01A-EN 7
Note: Do not exceed the maximum
rated airflow for the wheel. The
pressure drop across the wheel is not
to exceed 1.5 inches w.g.
Page 8
Wiring
5000C1 wheels a nd below
<
48in diameter
6000C1 wheels and above
>
54in diameter
CAUTION
Do Not Install VFDs!
Do not install a variable-frequency
drives (VFDs) to control wheel
speed. This may result in failure of
the wheel motor.
CAUTION
Factory-Installed Wiri ng!
Use caution when penetrating unit
casing. Factory wir ing may be r outed
in the side panels of the module.
Misplaced penetrations may result in
damage to the wiring.
CAUTION
Penetration Leaks!
Properly seal all penetr ations in unit
casing. Failure to seal penetrations
from inner panel to outer panel may
result in unconditioned air entering
the module, and water infiltrating
the insulation, resulting in
equipment damage.
Figure 1. CDQ wheel modules may have
factory-installed ribbon cables
attached inside. Take care when
penetrating the unit casing. Modules
will be labeled.
CDQ™ Desiccant
Wheel Cassette
Motor Data
If not factory-installed, the electrical
contractor must provide and install a
starter or starting contactor,
disconnect, fuses, etc., as required
by local codes, for the CDQ wheel
motor. Do not install a variable
frequency drive (VFD) to control the
desiccant wheel speed. This may
result in failure of the wheel motor.
The motor requires air movement for
continuous operation. Operating the
wheel for long periods with the fan
off may result in motor failure.
Table 1. Motor Data
Wheel Size
(nominal cfm)
500-5000 1/80 115 Volt
6000-40,000 1/80 115 Volt
*Motors are wired for counter clockwise rotation
HP Voltage/
phase
Single Phase
Single Phase
Optional Damper Act uators
Each actuator requires 24 V ac supply
power and wiring for the 2–10 Vdc
control signal. This wiring should be
sized and installed as required per
national and local electrical codes.
Optional Air Temperature
Sensors
If not factory-wired, connection to
the air temperature sensors is made
by penetrating through the side of
the module wall and making
electrical connections to the
temperature sensor. Nominal
resistance of these sensors is 1,000
ohms at 32 degrees F (0 degrees C).
The sensor is a thermistor with a
platinum 375 resistance curve. This
wiring should be sized and installed
as required per national and local
electrical codes.
HZ Full Load
Amps
60 0.3 2.30 CW/CCW*
60 0.3 4.50 CW/CCW*
Rotation
RPM
Rotation
Direction
8 CDQ-SVX01A-EN
Figure 2. Motor wiring
Page 9
Routine
Maintenance
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power befo re servicing could result
in death or serious injury.
WARNING!
Protect Eyes!
Always wear proper eye protection
when blowing compressed air or
water. Failure to wear proper
personal protection equipmen t (PPE)
could result in death or serious
injury.
CAUTION
Cleaners, Solvents and
Excess Pressure!
Do not use acid based cleaners,
aromatic solvents, steam, or
temperatures in excess of 170°F to
clean wheel. Do not use air or water
with pressures in excess of 20 PSIG.
Doing so may cause damage to the
wheel!
CAUTION!
Keep Wheel Clean!
Accumulated dirt and debris may
result in reduced airflow and/or
increased pressure drop across the
wheel. Increased pressure drop can
result in permanent damage to the
wheel or module.
Cleaning the
Desiccant Wheel
If routine inspection indicates there
is dirt or dust buildup in the wheel,
clean the wheel using the following
procedure:
Vacuum the wheel
1 Using a standard shop vacuum,
vacuum any debris from both
faces of the wheel. Slowly work
around the entire face of the
wheel to complete the
procedure. Do not damage
wheel face by excessive
pressure of the vacuum nozzle
on the wheel face.
2 Using 20 psig clean dry air, and a
small air nozzle, blow air through
one face of the wheel. At a
similar location on the opposite
side of the wheel, gently apply a
shop vacuum to “receive” any
remaining debris exiting the
wheel.
In most instances this should
adequately clean the wheel. In the
event the wheel is subject to an
aerosol, smoke or other material that
coats the wheel, it can be washed
with water and/or a mild detergent.
The desiccant wheel can be washed
thoroughly without affecting the
performance of the wheel. The wheel
will simply dry out following a
washing procedure and resume
dehumidification without any
deviation in performance.
If the desiccant wheel can be easily
removed from the cassette or unit, it
is recommended to do so to facilitate
the washing process. However, in
most cases, it is impractical to
remove larger wheels and therefore,
the washing procedure must take
place within the air handling unit and
provisions need to be made to collect
the runoff water from the bottom of
the unit.
Washing the wheel
1 Disconnect all power.
2 Shield or remove all electrical
components with plastic
sheeting. Shield the bearing
with plastic sheeting.
Precautions should be taken to
ensure the motor windings and
capacitor do not get wet.
3 Ensure that an adequate
drainage system exists to
collect runoff water from the
bottom of the unit.
4 Using standard pressure water
(do not use a high pressure
washer) and working from the
lower half of the wheel, wash
the wheel with a standard
“garden” nozzle to flush any
debris trapped within the flutes
of the wheel. Minimize water
contact with the seals. Wash
from one side and vacuum up
water from the other side with a
wet vacuum.
5 Once the entire process side is
adequately washed, rotate the
wheel one half turn and wash
the section that was at the top.
6 After washing, there will be a
temporary derate in
performance as the wheel dries
out. To expedite the dry out
time, regeneration preheat
should be activated if it was
provided.
CDQ-SVX01A-EN 9
Page 10
Routine Maintenance
Cleaning the Motor
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result
in death or serious injury.
Disconnect all electrical power, then
use a vacuum cleaner and brush to
remove accumulated material from
the CDQ wheel motor. The use of
spray aerosol cleaners is not
recommended. Examine the motor
monthly for debris accumulation.
Cleaning the CDQ
Module
1. Disconnect all electrical power.
2. Use a vacuum cleaner to remove
dust and debris from the module
surfaces.
Bearing and Motor
Lubrication
The wheel gear motor bearings are
pre-lubricated at the manufacturer
and do not require re-lubrication.
Wheels smaller than 8500 cfm,
66- inches in diameter, have a
permanently sealed inboard bearing
and need no maintenance. Larger
wheels come equipped with a
external flanged bearing that should
be greased annually.
Drive Belt Tension
The drive belt is a link stretch belt
designed to provide tension
throughout the life of the belt.
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. If
belt needs tensioning, see “Drive
Belt Adjustment/Replacement” on
page 16.
3. If needed, use a detergent
solution to remove grease, oil, or
other stubborn deposits from
module surfaces. Follow the
manufacturer’s instructions
regarding use of the product.
4. Rinse any cleaning product
thoroughly from the module
walls. The use of a water stream
from a garden hose or high
pressure washer is not
recommended. Saturation of the
wall panel insulation could result
in potential microbial growth.
5. Examine the module monthly for
material build-up on the wall
surfaces.
10 CDQ-SVX01A-EN
Page 11
Service
and Repair
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power befo re servicing could result
in death or serious injury.
CAUTION
Sharp edges!
Protect hands and belt from sharp
edges around hole in bearing
support beam. Always wear proper
personal protecti on equipment
(PPE). Failure to do so may result in
minor or moderate injury.
Procedure for
Internal Bearing
Replacement
3 Make sure the wheel is secure.
The short posts are removed
first (see Figure 4).
Figure 4. Remove short posts first.
4 IMPORTANT: To prevent wheel
from flipping out, cut two 1 -inc h
x 4-inch boards for placement
across the face and behind the
lip and corner braces on the
cassette (see Figure 5).
5 Remove the post mounting
screws or bolts at both ends of
the long post (see Figure 6).
Figure 6. Remove post mounting
screws.
6 Remove the shaft bolt (see
Figure 7).
Figure 7. Remove shaft bolt.
Prepare wheel for removal of old
bearing and installation of new
bearing.
1 Remove belt from motor and
wheel.
2 Support wheel with wooden
blocks on both sides of the
wheel (see Figure 3).
Figure 3. Wooden blocks support
wheel.
Figure 5. Prevent wheel from flipping
out with boards.
7 Remove the post (see Figure 8).
Figure 8. Remove post.
CDQ-SVX01A-EN 11
Page 12
Service and Repair
8 Remove the snap ring from the
shaft (see Figure 9).
Figure 9. Remove snap ring.
9 Remove shaft bolt, po st and
snap ring from opposite side
using the same procedure.
Remove shaft, being careful not
to damage it. You may want to
install a short bolt in the end of
the shaft and tap the bolt to
remove shaft.
10 Th e old bearing is removed by
tapping it from the back usin g a
rod or punch passed through
the other bearing. It is best to
use brass or other soft metal,
but if bearing is being replaced,
it is okay to use a steel rod.
Gently work around the race
with a series of gentle taps.
Using excessive force can cock
the bearing and make removal
difficult and/or damage the
aluminum hub. Once one
bearing is out, go to the other
side and repeat procedure to
remove the other bearing (see
Figure 10).
Figure 10. Remove old bearing by
tapping from the back. Gently tap
around the race. Repeat on opposite
side.
11 Clean the hub and new bearing
races before installing
12 Gently tap the outer race of the
new bearings into the hub
using a hammer, making sure
that the bearing is not cocked. It
is best to alternate to opposite
sides of the race as shown in
the two pictures at right. Do not
strike the inner race of the
bearing or it may be damaged
(see Figure 11).
Figure 11. Tap outer race of new
bearing, alternating sides.
13 Repeat the procedure for the
other bearing.
14 Install one snap ring on the
shaft and gently slide the shaft
through the bearings. It may be
necessary to tap it gently with a
hammer.
15 After the shaft is through the
bearings and snap ring is
against the inner race, install
the other snap ring.
16 Install the long post on one side
and re-install the shaft bolt.
17 Install the long post on the
other side and re-install the
shaft bolt.
18 Install the short posts.
12 CDQ-SVX01A-EN
Page 13
19 Check the wheel for rotation
and insure that is centered in
the cassette. It may be
necessary to loosen the shaft
bolts and adjust the wheel so
that it is equidistant from posts
on both sides.
20 Install the belt.
21 Start up unit and ch eck wheel for
clearance. Seals on the short
posts may have to be adjusted
for proper sealing.
Service and Repair
Figure 12. Exploded view of internal bearing and shaft assembly (no hub shown)
CDQ-SVX01A-EN 13
Page 14
Service and Repair
Procedure for
External Bearing
Replacement
Prepare wheel for removal of old
bearing and installation of new
bearing.
1 Remove belt from motor and
wheel.
2 Support wheel with wooden
blocks on both sides of the
wheel (see Figure 13).
Figure 13. Wooden blocks support
wheel.
4 Remove the bolt and washer
from the end of the shaft (see
Figure 15).
Figure 15. Remove bolt and washer
from shaft.
5 Loosen the set screws in the
bearing inner race (see
Figure 16).
Figure 16. Loosen set screws.
7 Remove the bearing. Use a
bearing puller if necessary.
8 Clean shaft and install new
bearing on shaft, insuring that
set screws line up with flats on
the shaft.
9 Install bearing mounting bolts
(see Figure 18). It may be
necessary to move wheel up or
down to align bolts. The easiest
method is to apply pressure at
the top of the wheel. Using a 1foot by 1-foot square of ½-inch
thick plywood on the face will
spread the force enough to
prevent damage to the media
face while pushing on the top of
the wheel. The other method of
lifting the wheel is to use a pry
bar at the bottom, taking care to
only apply force at a spoke to
prevent bending the band.
3 Remove cover plate from
bearing housing if present (see
Figure 14).
Figure 14. Remove cover plate.
Figure 18. Install bearing mounting
bolts.
6 Remove the bolts securing the
bearing to the cassette (see
Figure 17).
Figure 17. Remove bolts securing
bearing.
10 Tighten the bearing mounting
bolts.
11 Check alignment of the set
screws and tighten to the
specifications provided in the
literature with the bearing.
14 CDQ-SVX01A-EN
Page 15
12 Rotate the wheel and make sure
that it is aligned in the cassette
so that the face is equidistant
from each post. If not, loosen
the bearing mounting bolts and
adjust as necessary. Flange
bearing units have jack bolts
(see Figure 19). Pillow block
bearing units require shims to
adjust the bearing up or down
(see Figure 20). Retighten
bearing mounting bolts once
alignment is correct.
13 Install bearing cover plates.
Remove blocks supporting
wheel. Install belts.
Service and Repair
Figure 19. Typical Flange Bearing, Shaft and Hub Assembly
Figure 20. Typical Pillow Block Bearing, Shaft and Hub Assembly
CDQ-SVX01A-EN 15
Page 16
Service and Repair
Drive Belt
Adjustment/
Replacement
The CDQ wheel uses a link belt that
has no tension devices that need
adjustment. Tension the belt by
adjusting the number to links in the
belt. If the belt becomes too loose it
can be tighten by removing a link
from the belt.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result
in death or serious injury.
Belt Tension
1 Disconnect all power to the
desiccant wheel.
2 Slip belt off of drive pulley.
3 Hold the belt with tabs facing
outward as shown in Figure 21,
twist tab and push through one
link.
Figure 21. Hold belt with tabs facing
outward.
Figure 22. Twist and push through
links.
5 Remove one link.
6 Reconnect the belt as shown in
Figure 23.
a P u sh tab through
b Align belt
c Flex second tab through
Figure 23. Reconnect the belt.
16 CDQ-SVX01A-EN
4 Twist the next tab and push
through the two links as shown
in Figure 22.
Page 17
Service and Repair
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power befo re servicing could result
in death or serious injury.
Seal Adjustment
Neoprene brush seals are located on
both sides of the cassette around the
wheel perimeter and the center
diameter posts (see Figure 24). The
seals are designed to come in
contact with the wheel and require
no maintenance other than
adjustment. The seals consist of a
metal and neoprene clip that grips to
the metal posts or panels. These
clips can be manually adjusted.
To minimize air that bypasses the
wheel the perimeter seals should be
adjusted such that air gaps are not
visible around the wheel. Do not over
compress the seal against the
perimeter as this may cause the
wheel not to turn or overload the
motor. To minimize a ir the leaks from
one side to the next the diameter
seals should be adjusted to come in
full contact with the wheel face (see
Figure 25).
Figure 24. Neoprene brush seals are
located around wheel perimeter and
center diameter posts.
Figure 25. Adjust seals to fully contact
wheel face to minimize leaks.
Drive Motor and
Pulley Replacement
1. Disconnect all electrical power.
2. Remove the belt from the pulley
and temporarily position it
around the wheel rim.
3. Measure and record the distance
from the inner edge of the pulley
to the mounting wall.
4. Loosen the set screw in the wheel
drive pulley using an Allen
wrench and remove the pulley
from the motor drive shaft.
5. While supporting the weight of
the drive motor in one hand,
loosen and remove the four
mounting bolts.
6. Install a replacement motor with
the hardware kit supplied.
7. Install the pulley and adjust it to
the distance recorded in the
previous step.
8. Tighten the set screw to the drive
shaft.
9. Stretch the belt over the pulley
and engage it in the groove.
CDQ-SVX01A-EN 17
Page 18
Troubleshooting
WARNING
Hazardous Service
Procedures!
The maintenance and
troubleshooting procedures
recommended in this section of the
manual could result in exposure to
electrical, mechanical or other
potential safety hazard s. Always
refer t o the safety w arnings pr ovided
throughout this manual concerning
these procedures. When possible,
disconnect all electrical power
including remote disconnect and
discharge all energy storing devices
such as capacitors before servicing.
Follow pr op er lockout/tago ut
procedures to ensure the power can
not be inadvertently energized.
When necessary to work with live
electrical components, have a
qualified licensed electr ician or other
individual who has been trained in
handling live electrical components
perform these tasks. Failure t o follow
all of the recommended safety
warnings provided, could result in
death or serious injury.
WARNING
Toxic Hazards!
Do not use a CDQ desiccant wheel in
an application where the exhaust air
is contaminated with harmful to xins
or biohazards. This could result in
death or serious injury.
WARNING
Rotating Components!
Disconnect all electric power,
including remot e disconnects befor e
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Secure drive sheaves to
ensure rotor cannot freewheel.
Failure to secure drive sheaves or
disconnect power before servicing
could result in death or serious
injury.
18 CDQ-SVX01A-EN
Page 19
Troubleshooting
Table 2. Troubleshooting energy wheels
Symptom Probable Cause Recommended Action
Wheel will
not rotate
Motor is not running The fuse or circuit breaker may be blown or open. Check the breaker/fuse bo x and re plac e.
There may be a loss of incoming power. Attempt to trace the power loss back to its source
and correct.
The motor may have failed. Check for power at t he motor terminals. If present, disconnect
the belt from the motor pulley and see if the motor runs without a load. If it still doesn’t
run, replace the motor.
The motor may have failed because it is connected to a variable frequency drive.
Disconnect the VFD and run the motor on 60 Hz power only. Capacitor may be defective.
Replace. Refer to unit name plate for correct value.
Loss of
wheel
capacity
Excessive friction at the
seals
Drive belt is broken
Wheel main shaft bearing
is seized
Wheel is not rotating
Wheel is rotating too
slowly
Media surface is
contaminated
Wheel may be saturated
with liquid water
Re-adjust the diameter seals per the Seal Adjustment procedure.
Inspect visually. Replace the drive belt.
Replace the seized bearing.
See above
Belt is stretched, slipping. Replace the belt
Seized bearing on the main shaft; replace the bearing.
Excessive friction in seal s; adjust.
Clean the media surfaces.
Replace the media if it is severely contaminated and cannot be cleaned. Consider adding a
contaminate filter before (upstream) of the wheel.
Check for moisture carryover from coil or other possible sources such as steam or water
leaks in the unit which may be spraying the wheel with water. Remove source.
CDQ-SVX01A-EN 19
Page 20
www.trane.com
For more information, contact your local Trane
office or e-mail us at comfort@trane.com
Literature Order Number CDQ-SVX01A-EN
File Number SV-CDQ-SVX01A-EN-606
Supersedes New
Trane has a policy of continuous product and product data improvement and reserves the right to
change design and specifications without notice.
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