Trane CDQ Operating and safety instructions

Installation

Operation

Maintenance

CDQ™

Desiccant Wheels

for Climate Changer™ Air Handlers

June 2006 CDQ-SVX01A-EN

Part No. X39641062010

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 situation which, if not avoided, may result

in minor or moderate injury. It may also be used to alert against unsafe

practices.

CAUTION

...indicates a situation that may result in equipment or property-damage-only

accidents.

CDQ-SVX01A-EN 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

TraneCDQ™desiccantwheel isused

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 thewater

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

regenerationairstream.Theaddition

of the CDQ desiccant wheel to the

system enhances the

dehumidification performance of the

traditional cooling coil.

Protecting the

Environment

World environmental 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, andhydrogen),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

continueduse even when acceptable

alternatives are available.

Refrigerant used in any type of air-

conditioning 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!

Contents

4CDQ-SVX01A-EN

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

CDQ-SVX01A-EN 5

General

Information

Operating

Environment

When considering the placement of

the air handlers, it is important to

consider the operating environment.

Theacceptable 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 variable-

frequency 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, 50/60 Hz, 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

General Information

6CDQ-SVX01A-EN

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 ultraviolet lights in its

air handling equipment for the

intended purpose of improving

indoor air quality. High intensity C-

band ultraviolet light is known to

severely damage polymer (plastic)

materials and poses a personal

safety risk to anyone exposed to the

light without proper personal

protective equipment (could cause

damage to eyes and skin). Polymer

materials commonly found in HVAC

equipment that may be susceptible

include insulation on electrical

wiring, fan belts, thermal insulation,

various fasteners and bushings.

Degradation of these materials can

result in serious damage to the

equipment.

Trane accepts no responsibility for

the performance or operation of our

air handling equipment in which

ultraviolet devices were installed

outside of the Trane factory.

CDQ-SVX01A-EN 7

Operation

WARNING

Rotating Components!

Disconnect all electrical power,

including remote disconnects before

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 remote disconnects before

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 “over-

stroking” so excessive pressureis

not placed on the damper at the

full open or full closed position.

Note: Do not exceed the maximum

rated airflow for the wheel. The

pressuredropacrossthewheelisnot

to exceed 1.5 inches w.g.

8CDQ-SVX01A-EN

Wiring

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 Wiring!

Use caution when penetrating unit

casing. Factory wiring may be routed

in the side panels of the module.

Misplacedpenetrationsmayresultin

damage to the wiring.

CAUTION

Penetration Leaks!

Properly seal all penetrations 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.

Themotorrequiresairmovementfor

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) HP Voltage/

phase HZ Full Load

Amps Rotation

RPM Rotation

Direction

500-5000 1/80 115 Volt

Single Phase 60 0.3 2.30 CW/CCW*

6000-40,000 1/80 115 Volt

Single Phase 60 0.3 4.50 CW/CCW*

*Motors are wired for counter clockwise rotation

Figure 2. Motor wiring

5000C1 wheels and below

48in diameter 6000C1 wheels and above

54in diameter

Optional Damper Actuators

Each actuator requires 24 Vac 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.

CDQ-SVX01A-EN 9

Routine

Maintenance

WARNING

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

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.

WARNING!

Protect Eyes!

Always wear proper eye protection

when blowing compressed air or

water. Failure to wear proper

personalprotectionequipment(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

1Using 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.

2Using 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, smokeorothermaterialthat

coats the wheel, it can be washed

with water and/or a mild detergent.

The desiccant wheel can be washed

thoroughly without affecting the

performanceofthewheel. Thewheel

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

isrecommended to doso to facilitate

the washing process. However, in

most cases, it is impractical to

remove larger wheels and therefore,

the washing procedure must take

placewithinthe airhandlingunit and

provisionsneedtobemade tocollect

the runoff water from the bottom of

the unit.

Washing the wheel

1Disconnect all power.

2Shield 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.

3Ensure that an adequate

drainage system exists to

collect runoff water from the

bottom of the unit.

4Using 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.

5Once the entire process side is

adequately washed, rotate the

wheel one half turn and wash

the section that was at the top.

6After 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.

Routine Maintenance

10 CDQ-SVX01A-EN

Cleaning the Motor

WARNING

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

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.

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.

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.

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