Notes:
1 Monthly activities include all the weekly ones.
2 The annual (or early season) activities include all weekly and monthly activities.
3 Machine 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.
Replacement of filter dryer
It is strongly advised that the filter dryer cartridges be replaced in the event of a considerable pressure drop across the
filter or if bubbles are observed through the liquid sight glass while the subcooling value is within the accepted limits.
Replacement of the cartridges is advised when the pressure drop across the filter reaches 50 kPa with the compressor
under full load.
The cartridges must also be replaced when the humidity indicator in the liquid sight glass changes colour and shows
excessive humidity, or when the periodic oil test reveals the presence of acidity (TAN is too high).
Procedure to replace the filter dryer cartridge
ATTENTION
Ensure proper water flow through the evaporator during the entire servicing period. Interrupting the water flow during this
procedure would cause the evaporator to freeze, with consequent breakage of internal piping.
1.
Shut down the relevant compressor by turning the Q1 or Q2 switch to Off.
2.
Wait until the compressor has stopped and close the valve located on the liquid line.
3.
Start the relevant compressor by turning the Q1 or Q2 switch to On.
4.
Check the relevant evaporation pressure on the microprocessor display.
5.
When the evaporation pressure reaches 100 kPa turn the Q1 or Q2 switch again to turn off the compressor.
6.
Once the compressor has stopped, place a label on the compressor start-up switch that is under maintenance, to
prevent undesired start-ups.
7.
Close the compressor suction valve (if any).
8.
Using a recovery unit, remove surplus refrigerant from the liquid filter until atmospheric pressure is reached. The
refrigerant must be stored in a suitable and clean container.
ATTENTION
To protect the environment, do not release removed refrigerant into the atmosphere. Always use a recovery and storage
device.
9.
Balance internal pressure with external pressure by pressing the vacuum pump valve installed on the filter cover.
10. Remove the filter dryer cover.
11. Remove the filter elements.
12. Install the new filter elements in the filter.
13. Replace the cover gasket. Do not allow any mineral oil onto the filter gasket so as not to contaminate the circuit.
Use only compatible oil for this purpose (POE).
14. Close the filter cover.
15. Connect the vacuum pump to the filter and pull vacuum to 230 Pa.
16. Close the vacuum pump valve.
17. Recharge the filter with the refrigerant recovered during emptying.
18. Open the liquid line valve.
19. Open the suction valve (if any).
20. Start the compressor by turning switch Q1 or Q2.
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Summary of Contents for EWYD-BZ Series
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