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8.2.2 Fins and tubes coil maintenance
The operating environment of the units can affect life of Fins and tubes coils, both of condensing and of free cooling section.
In order to mantain the efficiency of the unit over time and its duration, it is necessary to do a frequent cleaning of Fins and
tubes coils.
As opposed to fin and tube heat exchangers, Fins and tubes coils are more likely to accumulate dirt on the surface. Dust,
pollution, etc...can create obstructions between the fins of the coils. These obstructions can be removed by washing
periodically under pressure.
The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities.
Before operating:
12. Disconnect the unit from power supply.
13. Wait for the fans to stop completely;
14. Make sure that the fan blades cannot move for any reason (for example: wind).
15. If present, remove the ”V” shaped panels.
16. Remove free cooling coils.
17. Before using a water jet on coils, remove bigger dirt, such as leaves and fibres, with a vacuum cleaner (preferably with
a brush or other soft attachment rather than a metal tube), compressed air blown from the inside out (if possible),
and/or a soft bristle (not wire!) brush. Do not impact or scrape the coil with the vacuum tube, air nozzle, etc.
18. Clean the condenser coil from the top, by removing fans grid.
19. Clean the surface of free cooling coils, if present, uniformaly from top to bottom, by putting the jet in front of the coils
with a right angle to the surface (90°).
Note: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibres and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded fibres must be completely removed prior to using low velocity
clean water rinse.
20. Rinse only. If needed use suggested coil cleaners only (ask Daikin factoy service for more information).
21. It is possible to clean a coil with a high-pressure washer (max 7 barg) only if a flat shape of the water spray is used
and direction of the spray is kept perpendicular to the fin edge. If this direction is not respected the coil may be
destroyed if using a pressure washer so we do not recommend their use.
Note: A monthly clean water rinse is recommended for coils that are applied in coastal or industrial environments to help
to remove chlorides, dirt and debris. It is very important when rinsing, to water temperature is less than 54 °C. An elevated
water temperature will reduce surface tension. Pressure shall not exceed 7 barg.
3. Quarterly cleaning is essential to extend the life of a E-coated coil and is required to maintain warranty coverage.
Failure to clean a E-coated coil will void the warranty and may result in reduced efficiency and durability in the
environment. For routine quarterly cleaning, first clean the coil with an approved coil cleaner. After cleaning the coils
with the approved cleaning agent, use the approved chloride remover to remove soluble salts and revitalize the unit.
WARNING: Harsh chemicals, household bleach or acid cleaners should not be used to clean coils. These cleaners can
be very difficult to rinse out of the coil and can accelerate corrosion. If needed use suggested coil cleaners only (ask Daikin
factoy service for more information)
Galvanic corrosion of the connection Fins and tubes can occur in corrosive atmosphere under the plastic protection; during
the maintenance operations or periodic cleaning, check the aspect of the plastic protection of the Fins and tubes
connection. If it is inflated, damaged, or took off contact the manufacturer representative for advice and information.
8.3 Inverter Capacitors
All units are equipped with an inverter which is directly mounted on board of compressor. Depending on unit model,
different inverter sizes are used. VFD models with small size capacitors are called “Capless”.
Table 24– Inverter sizes
VFD sizes
Type
90 kW
Capless
120 kW
Capless
200 kW
Capless
330 kW
Standard
400 kW
Standard
Low Ambient Start-up
Inverters include a temperature control which allows them to withstand ambient temperatures down to -20°C. However
they should not be switched on at temperatures lower than 0°C unless the following procedure is executed:
• Open the switchbox (only trained technicians should perform this operation)
Bekijk gratis de handleiding van Daikin EWFD555TZSSD2, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | EWFD555TZSSD2 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11779 MB |
