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9. Check compressor head and suction
pressure. If not within system design limits,
determine why and take corrective action.
10. For water cooled condensing unit check the
water flowing out of the condenser to see if it
drains properly.
11. Observe if ice skin tends to cover entire drum
surface and is being scraped-off correctly by
the blade.
12. Check liquid line sight glass and expansion
valve operation. If there are indications that
more refrigerant is required leak test all
connections before adding refrigerant.
13. Observe oil level in compressor crankcase
sight glass and add oil as necessary to bring
level to center of the sight glass.
Indicative Operating Pressure - With Fresh Water Supply - Water Cooled System
MAR 78
MAR 108
MAR 128
MAR 208
MAR 308
Head Pressure (bar)
17
15
16
16
14
Suction
1.8
1.6
1.6
1.9
0.75
Drum R.P.M. (thick ice)
1.1
1.5
2.4
1.05
1.8
Indicative Operating Pressure - With Sea Water Supply - Water Cooled System
MAR 121
MAR 301
Head Pressure (bar)
Suction
Drum R.P.M. (thick ice)
1.52
1.82
14. Let the system operate for at least two hours,
then check one by one the operation of each
individual control and protective device for
proper setting.
15. Eliminate any excessive vibration or noise
and pulleys misalignement.
16. Observe that evaporator drum is frosted all
over from end to end. If this is not the case
setting of refrigerant expansion valve may be
necessary. For proper adjustement of this
valve turn the valve setting stem of one eight
of a turn counter-clockwise to allow more
refrigerant to flow until the evaporator drum
surface is evenly frosted from end to end.
In case there is an excessive frost back on
the suction line and frost start to form on
compressor suction service valve, slightly
turn clockwise the expansion valve setting
stem until the frost back on the compressor
service valve melts over.
17. Observe that ice slides through spout opening
with no difficulties. Clearence between the
blade and drum surface must be 0,10 mm.
Transparent plastic chute must be flat.
18. When the system is performing satisfactorily
go over with the owner/user to all significant
specifications, the start-up and operations.
Answer alla questions about the care and
attention to give to the ice making system.
