Daikin UATYA120BFC2Y1 [51/534] External cleaning

Translation from original instructions

Packaged Rooftop

We reserve the right to make changes without any prior notice.

UATYA

4P645202-1

7.2 External cleaning

The component of the unit that needs most care is the nned pack heat exchanger.

It is essential to keep it clean and free of dirt and/or deposits that can hinder or prevent air ow.

Regular cleaning of the surface of the coil is essential for the unit to work correctly and also increases the operating

life of the exchanger and the unit.

Frequent and correct cleaning of the coils contributes to considerably reducing corrosion problems.

While cleaning the nned packed heat exchanger, the electrical control panel must be closed and the

main disconnect switch must be locked in the "OFF" position.

Using a jet of water on the coil while it is still dirty will cause deposits and pollutants to remain inside

the exchanger, which will make cleaning even more di󰀩cult. All the dirt and deposits must therefore be

removed from the surface before rinsing.

For units installed in coastal or industrial areas or in areas where there are aggressive chemicals in

the air, periodic rinsing with clean water is considerably benecial and helps counter corrosive e󰀨ects.

Never clean the coils with chemicals, water containing bleach or acid or basic detergents. These

detergents can be di󰀩cult to rinse o󰀨 and could accelerate corrosion on the joint between pipe and n

and in areas where di󰀨erent materials come into contact (Cu and Al).

7.2.1 Cleaning traditional nned coils in Cu/Al

Conventional pipe-n coils can be cleaned with a vacuum cleaner or a brush with soft, non-metallic bristles.

Always clean in the direction of the ns and never perpendicularly to them. They can easily be bent and damaged.

Clean in the opposite direction to the normal air ow.

The coil can then be rinsed using only drinking water at low pressure (3-5 barg).

Rinsing must be carried out with a low pressure jet of water to avoid damaging the ns.

Never use jets of water or high-pressure compressed air to clean the coil. The force of the jet of air or

water could bend the ns, with a consequent increase in aeraulic head losses on the exchanger and

lowering of the performance of the unit.