Sequence Of Operations; Recognizing Scalebreak®'S Saturation; Point - Trane SCWM Series Installation, Operation And Maintenance Manual

Refrigerant Coils
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
1. Disconnect all electrical power to the unit.
2. Wear the appropriate personal protective equipment
(PPE).
3. Access to the coil section of the unit (both sides).
4. Use a soft brush to remove loose debris from both
sides of the coil.
5. Mix a high quality coil cleaning detergent with water
according to the manufacturer's instructions. If the
detergent is strongly alkaline after mixing (pH 8.5 or
higher), it must contain an inhibitor. Carefully follow the
cleaning solution manufacturer's instructions regarding
product use.
6. Place the mixed solution in a garden pump-up sprayer
or high pressure sprayer. If using a high pressure
sprayer note the following:
• Maintain a minimum nozzle spray angle of 15°.
• Spray perpendicular to the coil face.
• Protect other areas of the equipment and internal
controls from contact with moisture or the cleaning
solution.
• Keep the nozzle at least six inches from the coil.
• Do not exceed 600 psig.
Draining the Waterside Economizer Coil
NOTICE
Coil Freeze-Up!
Failure to follow instruction below could result in
equipment damage.
Drain and vent coils when not in use. Trane
recommends glycol protection in all possible freezing
applications. Use a glycol approved for use with
commercial cooling and heating systems and copper
tube coils.
Drain plugs are in the piping below supply and return
header for each coil. Use these plugs to drain the coil and
piping. When draining the coil, open the vents at the top of
the supply and return headers. Also, a drain plug is at the
bottom of the inlet condenser manifold and in the outlet
PKG-SVX027D-EN
pipe near the left side of the unit. Remove these plugs to
drain the condensers. Be sure to open the vent plugs at the
top of the condenser inlet and outlet manifold.
When refilling the condenser/waterside economizer coil
system with water, provide adequate water treatment to
prevent the formation of scale or corrosion.
Chemically Cleaning the Condenser
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist to determine what water treatment, if any, is
required. Trane assumes no responsibility for
equipment failures which result from untreated or
improperly treated water, or saline or brackish water.
Condensing water contains minerals that collect in the
condenser. Cooling towers also collect dust and foreign
materials that deposit in the condenser. The formation of
scale or sludge in the condenser is indicated by a
decreased water flow, low temperature difference between
inlet and outlet water, and abnormally high condensing
temperatures. To maintain maximum condenser efficiency,
the condenser must remain free of built-up scale and
debris. Clean the condenser chemically. This unit is
equipped with removable and cleanable 20 mesh strainer.
The unit is also equipped with differential pressure sensors
that will alert the user when the strainer needs to be
replaced. Proper maintenance and cleaning of the
condenser is necessary to ensure proper performance of
the unit.
1. Disconnect all electrical power to the unit.
2. Wear appropriate personal protective equipment
(PPE).

Sequence of Operations

Recognizing ScaleBreak®'s saturation

point

Note: Goodway Technologies ScaleBreak-MP is the
recommended de-scaling solution.
Understanding the cleaning effectiveness or scale
dissolvability of ScaleBreak-MP during a cleaning is an
important part of the procedural steps. This simple practice
is designed to make sure the solutions activity level retains
functionality. Performing these tests can be accommodated
in two straightforward methods, by measuring the pH value
of the circulating solution and mapping the readings or a
simple calcium carbonate spot test of the circulating
solution.
Testing the pH of the ScaleBreak-MP solution during a
circulation is one method that will identify ScaleBreak-MP's
activity level. The pH of ScaleBreak-MP starts out with a
Maintenance
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