Compressor Pump Down And Operation; Compressor Pump Down (Replaced) - Maersk Container Industry Star Cool SCI-20 Operating And Service Manual

6. Open suction service valve fully. Before operating the suction service valve, loosen the gland
seal by ¼ turn before you move the spindle. Once finished, tighten the gland seal and put on
the protective spindle cap.
7. Check the service gauge manifold, should be in a slight vacuum.
8. Close all valves and stop the recovery unit. The evacuation is now completed.
Note: Refer to operating and service manuals for the recovery equipment.

22.2 Compressor pump down and operation

Pump down of the compressor is done by the following procedure:
1. Connect a service gauge manifold to the two evacuation points, pos. 6 and 27 (P & I diagram)
on the compressor.
2. Connect a recovery unit to the gauge manifold.
a. Connect a recycling bottle to the recovery unit.
b. Use a scale underneath the bottle, for measuring the amount of recycled refrigerant.
3. Close the suction service valve and economizer suction service valve, pos. 26 and 30 (P & I
diagram). Before operating the suction service valve, loosen the gland seal by ¼ turn before
you move the spindle. Once finished, tighten the gland seal and put on the protective spindle
cap.
4. Close the discharge service valve, pos. 5 (P & I diagram), approx. 4 turns.
5. Run the compressor in Manual operation on 50 Hz, (see "11.18 Manual operations" p. 50).
6. Observe the LP indication until a vacuum of -0.5 Bar/E (-7.3 Psi) has been reached.
7. Turn off the compressor.
8. Close the discharge service valve pos. 5 (P & I diagram).
a. The evacuation points, pos. 6 and 27 (P & I diagram), are open, when the service valves,
pos. 5 and 26 (P & I diagram), are closed.
9. Open the HP valve on the service gauge manifold.
10. Check that the recovery unit is set for vapour recovery.
11. Start and operate the recovery unit as long as necessary to evacuate the remaining pressure.
12. Check the service gauge manifold, should be in a slight vacuum.
13. After disconnecting the evacuation unit, the compressor is now ready to be replaced.
Suction
pressure
indicator

22.3 Compressor pump down (replaced)

Pump down of a new/replaced compressor is done by the following procedure:
1. Connect a vacuum pump with a service gauge manifold to the two evacuation points, pos. 6
and 27 (P & I diagram).
2. Check that all service valves are still closed, pos. 5, 26, and 30 (P & I diagram). Before oper-
ating the suction service valve, loosen the gland seal by ¼ turn before you move the spindle.
Once finished, tighten the gland seal and put on the protective spindle cap.
3. Pump down the ambient pressure in the compressor to a vacuum, indicated on the gauges of the
service gauge manifold.
4. Continue vacuum – pumping for at least 2 hours (removing possible moisture in the oil).
5. Close the service gauge manifold LP/HP valves.
6. Switch off the vacuum pump. Write down the vacuum reading, from the service gauge mani-
fold.
7. Observe the vacuum for minimum 0.5 hour.
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