Daikin Outdoor Unit Cooling Only Air Conditioner EWAT050CZP-A2

Reading of operating data (Note 3: Daily reading of the operating values of the unit allows maintaining high observational standards)

Visual inspection of unit for any damage and/or loosening

Verification of thermal insulation integrity

Analysis of water (Note 4: Check for any dissolved metals.)

Verification of control sequence

Verify contactor wear - Replace if necessary

This unit must be maintained by qualified technicians. Before beginning any work on the system, the personnel shall assure that all security precautions have been taken.

Neglecting unit maintenance could degrade all parts of the units (coils, compressors, frames, pipes, etc.) with negative effect on performances and functionality.

There are two different levels of maintenance, which can be chosen according to the type of application (critical/noncritical) or to the installation environment (highly aggressive).

Examples of critical applications are process cooling, data centres, etc.

Highly Aggressive Environments can be defined as the follows:

• Industrial environment (with possible concentration of fumes result of combustion and chemical process);

• Highly polluted urban environment;

Routine cleaning of air heat exchanger surfaces is essential to maintain proper operation of the unit, avoid corrosion and rusting.

Elimination of contamination and removal of harmful residues

Remove surface dirt, leaves, fibers, 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.

Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil.

Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

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 that the water temperature is below 55 °C.

Galvanic corrosion of the connection Copper/Aluminum can occurre in corrosive atmosphere under the plastic protection; during the maintenance operations or periodic cleaning, check the aspect of the plastic protection of the copper/aluminum connection.