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IDX-OM-Y002
Chapter 5
Checks
, Maintenance and Adjustment
5.2
Regular maintenance
IDF190D/240D Series
5-4
Stop supplying the cooling water and remove the Y shaped strainer mesh for inspection.
When foreign matter has accumulated, remove it using a brush or air gun so that the mesh is not
deformed or damaged.
(4) Cleaning of cooling water system (every 3 months)
Clean the user's cooling water system and replace the cooling water with new water.
Cooling water quality must satisfy the criteria specified in "Table 4-1".
(5) Cleaning of cooling water side of the water-cooled condenser
Even if the water quality is properly controller, the cooling performance will be deteriorated by the
scales in the cooling piping. Please clean the cooling piping periodically referring the procedure
below.
Cleaning is possible mechanically or chemically.
Water-cooled condenser used for IDF190D-3-W, IDF240D-3-W cannot be cleaned mechanically
because it is double pipe type. It should be cleaned chemically.
1
)
Chemical cleaning method
When the tank is cleaned, cleaning agent is poured in the tank and left for a specific period of
time, or cleaned with circulating cleaning agent. The latter is more effective. It is necessary to
carefully consider the generation of corrosive gas and corrosion caused by the cleaning agent.
a)
Cleaning procedure (static method)
1. Disconnect the inlet / outlet water tube for the heat exchanger, then connect the hose
(rubber or vinyl).
2. Raise and secure the hose, fill the liquid so that the liquid level of the cleaning liquid is at
least 1m above the top end of the water chamber cover, and leave it for a specified time.
3. Discharge the cleaning fluid and rinse the cooling tower with water for 20 minutes or longer
to get rid of the cleaning agent.
[Note]
It is recommended to install valves and pressure gauges to clean the Y shaped strainer easily.
By fully closing the valves, it is not necessary to stop the facility water system while cleaning the Y shaped
strainer. With a pressure gauge, the pressure of the cooling water circuit can be checked and works can be
performed safely.
Hose
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