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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.

Microchannel Coil maintenance

The operating environment of the units can affect life of MCH 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 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 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:

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. Remove surface dirt, leaves, fibres, etc. with a vacuum cleaner (preferably with a brush or other soft attachment rather

than a metal tube), compressed air blown from the inside out, and/or a soft bristle (not wire!) brush. Do not impact or
scrape the coil with the vacuum tube, air nozzle, etc.

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.

7. Do not use any chemicals (including those advertised as coil cleaners) to wash microchannel heat exchangers. They

can cause corrosion. Rinse only. 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.

8. It is possible to clean a coil with a high-pressure washer (max 62 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 55 °C. An elevated
water temperature (not to exceed 55 °C) will reduce surface tension, increasing the ability to remove chlorides and dirt.

3. Quarterly cleaning is essential to extend the life of an E-coated coil and is required to maintain warranty coverage.

Failure to clean an 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.

Note:

Harsh chemicals, household bleach or acid cleaners should not be used to clean E -coated coils. These cleaners

can be very difficult to rinse out of the coil and can accelerate corrosion and attack the E-coating. If there is dirt below the
surface of the coil, use the recommended coil cleaners as described above.

Galvanic corrosion of the connection Copper/Aluminium can occur in corrosive atmosphere under the plastic p rotection;
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.

7.3

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”.