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>0,19 : Replace oil, oil filter and filter dryer. Verify at regular intervals
8. Check that the cap and the seal have not been tampered with. Check that the drainage connection of the safety valves is not
accidentally occluded by foreign objects, rust or ice. Check the manufacturing date on the safety valve and replace it, if necessary,
in compliance with the national laws in force.
9. Clean condenser banks with clean water and water heat exchangers with appropriate chemicals. Particles and fibers could clog up
the exchangers, especially for water exchangers pay attention if water rich in calcium carbonate is used. An increase in pressure
drops or a decrease in thermal efficiency means that the heat exchangers are clogged. In environments with a high concentration
of air-borne particles, it might be necessary to clean the condenser bank more often.
Table 19 – Routine Maintenance Plan for Critical Application and/or Highly Aggressive Environment
List of activities (Note 8)
Reading operating data (Note 3)
Visual inspection of unit for any damage and/or loosening
Verification of thermal insulation integrity
Check of flow switch operation
Verification of control sequence
Verify contactor wear – Replace if necessary
Verify that all electrical terminals are tight – Tighten if necessary
Clean inside the electrical control board
Visual inspection of components for any signs of overheating
Verify operation of compressor and oil heater
Measure compressor motor insulation using the Megger
Clean air intake filters of the electrical panel
Verify operation of all ventilation fans in the electrical panel
Verify operation of inverter cooling valve and heater
Verify status of capacitors in the inverter (signs of damage, leaks, etc)
Check for any refrigerant leakage
Verify refrigerant flow using the liquid sight glass – Sight glass full
Verify filter dryer pressure drop
Verify oil filter pressure drop (Note 5)
Analyse compressor vibrations
Analyse compressor oil acidity (Note 7)
Check the security valve (Note 8)
Condenser/Hydronic Freecooling section:
Clean water rinse condenser coils (Note 4)
Quarterly clean condenser coils (E-coated only)
Verify that fans are well tightened
Verify condenser coil fins – Comb if necessary
Check the aspect of the plastic protection of the copper/aluminum connection
Check the cleaning of the Evaporator/BPHE (Note 9)
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. Replace the oil filter when the pressure drop across it reaches 2.0 bar.
6. Check for any dissolved metals.
7. 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.
10. Check that the cap and the seal have not been tampered with. Check that the drainage connection of the safety valves is not
accidentally occluded by foreign objects, rust or ice. Check the manufacturing date on the safety valve and replace it, if necessary,
in compliance with the national laws in force.
7.2 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.
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