Daikin EWAQ-E Series - Routine Maintenance

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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 50% of the nominal flow rate.
Periodic obligatory checks and starting up of
appliances under pressure
The units are included in category III of the classification
established by the European Directive PED 2014/68/EU.
For chillers belonging to this category, some local regulations
require a periodic inspection by an authorized agency. Please
check with your local requirements.
Maintenance
Routine maintenance
This chiller 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 in these environments, 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/non critical)
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)
 Costal environment;
 Highly polluted urban environment;
 Rural environment close to of animal
excrement and fertilizers, and high
concentration of exhaust gas from diesel
generators.
 Desert areas with risk of sandstorms;
 Combinations of the above
Table 2 lists all Maintenance activities for standard applications
and standard environment.
Table 3 lists all Maintenance activities for critical applications
or highly aggressive environment.
Following below instructions is mandatory for cases listed
above, but also advised for units installed in standard
environments.
Table 2 - Routine maintenance programme
List of Activities
Weekly
Monthly
(Note 1)
Yearly/Seas
onal
(Note 2)
General:
Reading of operating data (Note 3)
X
Visual inspection of unit for any damage and/or loosening
X
Verification of thermal insulation integrity
X
Clean and paint where necessary
X
Analysis of water (5)
X
Check of flow switch operation
X
Electrical:
Verification of control sequence
X
Verify contactor wear – Replace if necessary
X
Verify that all electrical terminals are tight – Tighten if necessary
X
Clean inside the electrical control board
X
Visual inspection of components for any signs of overheating
X
Verify operation of compressor and electrical resistance
X
Measure compressor motor insulation using the Megger
X
Refrigeration circuit:
Check for any refrigerant leakage
X
Verify refrigerant flow using the liquid sight glass – Sight glass full
X
Verify filter dryer pressure drop
X
Analyse compressor vibrations
X
Analyse compressor oil acidity (Note 6)
X
Condenser section:
Clean condenser banks (Note 4)
X
Verify that fans are well tightened
X
Verify condenser bank fins – Comb if necessary
X
Notes:
1. Monthly activities include all the weekly ones.
2. The annual (or early season) activities include all weekly and monthly activities.
3. Unit operating values should be read on a daily basis thus keeping high observation standards.
4. In environments with a high concentration of air-borne particles, it might be necessary to clean the condenser bank more often.
5. Check for any dissolved metals.
6. TAN (Total Acid Number) :  0,10 : No action
Between 0.10 and 0.19 : Replace anti-acid filters and re-check after 1000 running hours. Continue to replace filters
until the TAN is lower than 0.10.
 0,19 : Replace oil, oil filter and filter dryer. Verify at regular intervals.