Replacement Of Filter Dryer; Replacement Of Vacuum Pump Heating Element - Maersk Container Industry Star Cool SCI-20 Operating And Service Manual

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19.8 Replacement of filter dryer

Before replacing the drying filter, the power plug to the unit has to be disconnected.
The drying filter has to be changed every time the compressor is changed or if the moisture
indicators indicate too much moisture in the refrigerant circuit. To change the drying filter, please
follow the procedure below:
1. Power off the unit.
2. Close the stop valve, pos. 14 (P & I diagram).
3. Start the unit in Manual operation.
4. Select compressor frequency to 40 Hz.
5. Observe the suction pressure (Psuc). When Psuc = 0 BarE, power off the unit.
6. Carefully loosen the two union nuts for the drying filter. Beware of pressurized escaping
refrigerant. Always wear protective goggles and gloves.
7. Replace the drying filter with a Danfoss DML 164 O-ring or equivalent. Before mounting of the
filter, put some drops of compressor ester oil on the flare in order to ensure correct tightness.
8. Tighten the two union nuts for the drying filter. (see "23.12 Tightening torques" p. 103).
9. Remove the electrical coils and mount permanent magnet on the two electronically expansion
valves, pos. 16 and 18 (P & I diagram).
10. Carefully loosen the upper union nut for the drying filter, allowing a little amount of refrigerant
gas to escape.
11. Tighten the union nut.
12. Remove the permanent magnets and reinstall the electrical coils on the two electronically
expansion valves, pos. 16 and 18 (P & I diagram).
13. Open the stop-valve, pos. 14 (P & I
14. Power up the unit.

19.9 Replacement of vacuum pump heating element

1. Power off the unit.
2. Be aware of hot surfaces.
3. Remove the cover shield from the vacuum pump by the 4 bolts. Dismantle the vacuum pump
from its socket. Disconnect the heating element in the terminal box.
4. Tilt the vacuum pump to avoid spilling oil when replacing the heating element.
5. Attach the cables to the terminal box on top of the vacuum pump according to the wiring dia-
gram.
6. Reinstall the vaccum pump and turn the power on.
7. Test performance of the heating element by running a CA PTI.
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diagram).