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Procedure to replace the filter dryer cartridge
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.
Once the compressor has stopped, place a label on the compressor start-up switch, to prevent undesired
start-ups.
4.
Close the compressor suction valve (if any).
5.
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.
To protect the environment, do not release removed refrigerant into the atmosphere. Always use a recovery and
storage device.
6.
Balance internal pressure with external pressure by pressing the vacuum pump valve installed on the filter
cover.
7.
Remove the filter dryer cover.
8.
Remove the filter elements.
9.
Install the new filter elements in the filter.
Do not start the machine before the cartridge has been correctly inserted in the filter dryer. The unit
manufacturer will accept no responsibility for any damage to persons or property caused during unit
functioning if the filter dryer cartridges have not been correctly inserted.
10.
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).
11.
Close the filter cover.
12.
Connect the vacuum pump to the filter and pull vacuum to 230 Pa.
13.
Close the vacuum pump valve.
14.
Recharge the filter with the refrigerant recovered during emptying.
15.
Open the liquid line valve.
16.
Open the suction valve (if any).
17.
Start the compressor by turning switch Q1 or Q2.
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
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.
18.
Shut down the relevant compressor by turning the Q1 or Q2 switch to Off.
19.
Wait until the compressor has stopped and close the valve located on the liquid line.
D–EIMWC00508-16EN - 34/48
CAUTION
CAUTION
CAUTION
ATTENTION
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