Boreas Technologies Air Handling Unit - Cooling Water Coil; Initial Start-Up; Maintenance

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7.4 COOLING WATER COIL
All provisions stated under the heading of 2. GENERAL SAFETY must be applied during the
commissioning and maintenance of heat exchangers.
7.4.1 Initial Start-up
• Care must be taken to ensure that pressure limits provided for the heat exchanger are not
exceeded.
• Care must be taken to ensure that the input and return lines have been connected correctly
according to the unit labels.
• After the system is filled with water, the air must be extracted from the highest section of the
line. The purger needed for this can be found on the heat exchanger.
• Check flange bushing connections for leakages after commissioning.
7.4.2 Maintenance
It is recommended that maintenance procedures be carried out every three months. These maintenance
procedures are of critical importance for both cooling efficiency and the total efficiency of the system.
Care should be taken with the following issues with respect to cleaning:
• The fins should be protected from damage.
• Pressurized air should be applied in the direction counter to the air current in fin cleaning.
• If some areas can not be accessed when the unit is assembled, the heat exchanger should be
removed by disconnecting the necessary connections.
• High pressure cleaning machines should not be used.
• Cleaning agents in the pH range of 7-9 should be used.
Periodic Maintenance of the Water Heating Heat Exchanger:
• Check whether the heat exchanger conforms to hygiene standards, and check for
accumulated dust, corrosion, and damages.
• Purge air in the coil.
• Check the inlet and outlet pipe lines for leakages.
• Check the anti freezing thermostat electrical connections and verify for correct operating.
•
Check fin surfaces, if there are any dents, straighten using a fin comb.