Unit Maintenance And Cleaning; Inverter Electrolytic Capacitors; Service And Limited Warranty - Daikin EWAD-C Original Instructions Manual

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.
8.3

Inverter Electrolytic Capacitors

Compressor Inverters include electrolytic capacitors which have been designed to last a minimum of 15 years in normal
use. Heavy duty conditions may reduce the actual life of capacitors.
The chiller calculates capacitor residual life based on actual operation. When residual life gets below a give thre shold, a
warning is issued by the controller. In this case replacement of capacitors is recommended. This operation must be done
only by qualified technicians. Replacement must be carried out through the following procedure:
•
Power off the chiller
•
Wait for 5 minutes before opening the inverter case
•
Check that residual dc voltage in the dc link is zero.
•
Open the inverter case and replace old capacitors with new ones.
•
Reset the chiller controller through the maintenance menu. This will allow the controller to recalculate the new
estimated life of the capacitors.
Capacitor Reforming after long shut-off period
Electrolytic capacitors may lose part of their original characteristics if they are not powered for more than 1 year. If chil ler
has been shut off for a longer period a "reforming" procedure as follows is necessary:
•
Power on the inverter
•
Keep it powered on without starting the compressor for at least 30 minutes
•
After 30 minutes the compressor can be started
Low Ambient Start-up
Inverters include a temperature control which allows them to withstand ambient temperatures down to -20°C. However
they should not be switched on at temperatures lower than 0°C unless the following procedure is executed:
•
Open the switchbox (only trained technicians should perform this operation)
•
Open compressor fuses (by pulling the fuse holders) or compressor circuit breakers
•
Power on the chiller
•
Keep the chiller powered on for 1 hour at least (this allows inverter heaters to warm-up the inverter).
•
Close fuse holders
•
Close the switchbox
9

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. It is important, however, to ensure proper and periodical maintenance in accordance with all the procedures
listed in this manual and with good practice of machines maintenance.
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 also be taken into consideration that the unit requires maintenance also during the warranty period.
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 un 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. Unless there is a specific agreement at the time of ordering, the evaporator water flow rate must never be above 120%
and below 80% of the nominal flow rate.
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