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8.2 Unit Maintenance and cleaning
Unit exposed to a highly aggressive environment can face corrosion in a shorter time than ones installed on a standard
environment. Corrosion causes a rapid rusting of the frame core, consequently decreases unit structure life time. To
avoid that, it is necessary to wash periodically the frame surfaces with water and suitable detergents.
In case of part of unit frame paint came off, it is important to stop its progressive deterioration by repainting the exposed
parts using proper products. Please contact factory to get the required products specifications.
Note: in case of just salt deposits are present, it is enough to rinse the parts with fresh water.
Shut-off valves must be turned at least once a year in order to preserve their function.
8.2.1 Microchannel Coil maintenance
The operating environment of the units can affect life of MCH coils (made of aluminium material), 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 MCH coils.
As opposed to fin and tube heat exchangers, MCH coils are more likely to accumulate dirt on the surface. Dust, pollution,
etc...can create obstructions. 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:
1. Disconnect the unit from power supply.
2. Wait for the fans to stop completely;
3. Make sure that the fan blades cannot move for any reason (for example: wind).
4. If present, remove the ”V” shaped panels.
5. Remove free cooling coils.
6. 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.
7. Clean the condenser coil from the top, by removing fans grid.
8. 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.
9. Rinse only. If needed use suggested coil cleaners only (ask Daikin factoy service for more information) Hose
the MCHE off gently preferably from the inside out and top to bottom, running the water through every fin passage
until it comes out clean. Microchannels fins are stronger than traditional tube & fin coil fins but still need to be handled
with care.
10. It is possible to clean a coil with a high-pressure washer (max 15 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.
11. Blow off or vacuum out the residual water from the coil (to speed up drying and prevent pooling).
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 15 barg.
Note: Quarterly cleaning is essential to extend the life of a coil and is required to maintain warranty coverage. Failure to
clean a coil will void the warranty and may result in reduced efficiency and durability in the environment.
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 Copper/Aluminium 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 Copper/Aluminium
connection. If it is inflated, damaged, or took off contact the manufacturer representative for advice and information.
In case of free cooling MCH coil failure, stream the section before pressurizing it with nitrogen up to 1-2 barg to remove
any trace of humidity.
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 |
