Refrigerant Coils; Draining The Waterside Economizer Coil; Chemically Cleaning The Condenser - 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. For variable frequency drives or other energy
storing components provided by Trane or others, refer to
the appropriate manufacturer's literature for allowable
waiting periods for discharge of capacitors. Verify with a
CAT III or IV voltmeter rated per NFPA 70E that all
capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN.
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.
PKG-SVX027A-EN

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
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 corrosions.

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).
Maintenance
67