Electrical Installation; Service And Limited Warranty - Daikin EWAT_B Series Installation, Maintenance And Operation Manual

2. Rinse. 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.
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 spay 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/Aluminum 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/aluminum
connection. If it is inflated, damaged or took off contact the manufacturer representative for advice and information.
4.2.2

Electrical Installation

All electrical maintenance activities must be followed by qualified personnel. Make sure the system
is switched off and the main switch of the unit open. Failure to observe this rule could result in serious
personal injury. When the unit is turned off but the disconnection switch is in the closed position, the
unused circuits will still be active.
The maintenance of the electrical system consists of the application of some general rules as follows:
1. the current absorbed by the compressor must be compared to the rated value. Normally the value of the absorbed
current is lower than the rated value that corresponds to the absorption of the full load compressor at the maximum
operating conditions;
2. at least once every three months all the security checks must be made to verify their functionality. Each appliance,
with aging, can change its point of operation and this must be monitored in order to adjust it or replace it. The pump
interlocks and flow switches must be checked to make sure that they interrupt the control circuit if they intervene.
4.2.3

Service and limited warranty

All units are factory-tested and guaranteed for 12 months as of the first start-up or 18 months as of delivery.
These units have been developed and constructed according to high quality standards ensuring years of failure-free
operation. However, the unit requires maintenance even during the warranty period, from the time of installation
and not just from the commissioning date. We strongly advise stipulating a maintenance contract with a service
authorized by the manufacturer in order to ensure efficient and problem-free service, thanks to the expertise and
experience of our personnel.
It must be borne in mind that operating the unit in an inappropriate manner, beyond its operating limits or not performing
proper maintenance according to this manual can void the warranty.
Observe the following points in particular, in order to conform to warranty limits:
1. The unit cannot function beyond the specified limits;
2. The electrical power supply must be within the voltage limits and without voltage harmonics or sudden changes;
3. The three-phase power supply must not have an unbalance between phases exceeding 3%. The unit must stay turned
off until the electrical problem has been solved;
4. No safety device, either mechanical, electrical or electronic must be disabled or overridden;
5. The water used for filling the water circuit must be clean and suitably treated. A mechanical filter must be installed at
the point closest to the evaporator inlet;
6. the value of the evaporator water flow must be included in the declared range for the unit considered, refer to the CSS
selection software.
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