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4.4.2. Water treatment for long-term shut-down
Perform the following procedure during long-term shut-down
when no chilled/hot water or cooling water circulates in the
chiller. Please consult your Carrier service agent for the details.
Cooling water
The usual system is a wet system with the cooling water kept
in the chiller. If the cooling water is likely to freeze, drain it
from the chiller (dry system). The valve operation is different
between wet and dry systems.
Long-term shut-down (wet system)
•
Drain the cooling water from its discharge port on the
cooling water outlet.
•
Add anti-corrosion inhibitor to the water.
Check the holding water quantity and decide the inhibitor
quantity so that the ratio is appropriate.
•
Charge the chiller with cooling water.
•
Operate the cooling water pump until the inhibitor is
evenly mixed.
•
Close the cooling water line inlet and outlet isolation
valves.
Dry system
Before draining the cooling water from the chiller, clean the
inside of the tubes and provide a corrosion protection covering.
•
Drain the cooling water from its discharge port on the
cooling water inlet.
•
Remove the scale and/or slime from the tubes with a
brush. If scale and/or slime cannot be removed with a
brush use chemical cleaning.
•
After sufficient cleaning, add anti-corrosion inhibitor to
the water, and circulate the water with the inhibitor for 30
minutes or more. The inhibitor concentration should be
even.
•
Drain the water from the discharge port on the cooling
water inlet.
•
Keep the discharge port open during shut-down.
Chilled water
The usual system is a wet system with the chilled water kept in
the chiller.
4.4.3 - Winter season
If the ambient temperature of the chiller is likely to be below
0°C in winter, freeze protection is necessary. Consult your
Carrier service agent for the details.
5 - TROUBLESHOOTING
For identifying and eliminating the causes of machine failure,
please refer to the following chapters:
3.7 - Maintenance message
3.8 - Alarm indication and actions
Appendix 1 - Flowchart (at the end of that document)
27
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