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108
Owner
Also, a drain plug is at the bottom of the
inlet condenser manifold and in the outlet
pipe near the unit's left side. Remove
these plugs to drain the condensers. Be
sure to open the vent plugs at the top of
the condenser inlet and outlet manifold.
See Figure O-M-7 on page 105.
When refilling the condenser/waterside
economizer coil system with water,
provide adequate water treatment to
prevent the formation of scale or
corrosion.
CAUTION
!
Failure to provide adequate water
treatment in condenser systems
may result in coil and condenser
fouling or undue metal damage.
Cleaning the Condenser
Note: Using improperly treated or un-
treated water in this equipment may result
in scaling, erosion, corrosion, algae, or
slime. Engage the services of a qualified
water treatment specialist to determine
what treatment is advisable. The Trane
Company warranty specifically excludes
liability for corrosion, erosion, or deteriora-
tion of Trane equipment. Trane assumes
no responsibilities for the results of the
use of untreated or improperly treated
water, saline, or brackish water.
Condensing water contains minerals that
collect on the condenser tube walls.
Cooling towers also collect dust and
foreign materials that deposit in the
condenser tube. 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 tem-
peratures. To maintain maximum
condenser efficiency, the condenser must
remain free of built-up scale and sludge.
Clean the condenser either mechanically
or chemically.
Mechanical Cleaning of Condenser and
Economizer Coils
1. Turn off the condenser supply water.
Remove drain plugs discussed in the
"Draining the Coil" section on page 94.
Maintenance
2. Remove the condenser's left side to
expose the condenser tubes.
3. Rotate a round brush through the tubes
to loosen contaminant.
4. Flush tubes with water to push the
sludge out through the drain opening in
the bottom of the supply header and
the return pipe.
5. To clean the economizer tubes, remove
the cast iron header plates at the coil's
right end between the inlet and outlet
headers (4-row coils; 2-row coils do not
have cover plates at right end). Rotate
round brush through tubes from left
end to loosen contaminants. Flush
tubes with water.
6. Replace condenser end plates and
clamps. The end plates must be
centered when tightening the clamp.
7. Replace coil headers with gaskets and
torque bolts to 50 ft.-lb.
8. Replace drain and vent plugs.
Chemical Cleaning of Condenser and
Economizer Coil
Chemical cleaning removes scale
deposits built up by minerals in the water.
For a suitable chemical solution, consult a
water treatment specialist. The
condenser water circuit is composed of
copper, steel, and cast iron.
The chemical supply house should
approve or provide all materials used in
the external circulating system, along
with the quantity of cleaning material,
duration of cleaning time, and safety
precautions necessary for handling the
cleaning agent.
SCXG-SVX01B-EN
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