S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
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Refrigeration System Section 7<br />
Cycle Time/24 Hour <strong>Ice</strong> Production/<br />
Refrigerant Pressure Charts<br />
These charts are used as guidelines to verify correct ice<br />
machine operation.<br />
Accurate collection of data is essential to obtain the<br />
correct diagnosis.<br />
• Refer to “OPERATIONAL ANALYSIS TABLE” for the<br />
list of data that must be collected for refrigeration<br />
diagnostics. This list includes: before beginning<br />
service, ice production check, installation/visual<br />
inspection, water system checklist, ice formation<br />
pattern, safety limits, comparing evaporator inlet/<br />
outlet temperatures, discharge and suction pressure<br />
analysis.<br />
• <strong>Ice</strong> production checks that are within 10% of the<br />
chart are considered normal. This is due to variances<br />
in water and air temperature. Actual temperatures<br />
will seldom match the chart exactly.<br />
• Zero out manifold gauge set before obtaining<br />
pressure readings to avoid misdiagnosis.<br />
• Discharge and suction pressure are highest at the<br />
beginning of the cycle. Suction pressure will drop<br />
throughout the cycle. Verify the pressures are within<br />
the range indicated.<br />
• Record beginning of freeze cycle suction pressure<br />
one minute after water pump energizes.<br />
• Regular cube production derate is 7%<br />
• 50Hz production derate is 7%<br />
• 50Hz regular cube total production derate is 14%<br />
<strong>S1800</strong> SERIES<br />
Self-Contained Water-Cooled<br />
NOTE: These characteristics may vary depending on<br />
operating conditions.<br />
Cycle Times<br />
Freeze Time + Harvest Time = Total Cycle Time<br />
Air Temp.<br />
Freeze Time<br />
Around <strong>Ice</strong> Water Temperature °F/°C<br />
Machine<br />
°F/°C 50/10.0 70/21.1 90/32.2<br />
70/21.1 8.5-9.4 9.2-10.1 10.7-11.8<br />
80/26.7 8.5-9.4 9.3-10.3 10.9-12.0<br />
90/32.2 8.6-9.4 9.4-10.4 11.1-12.2<br />
100/37.8<br />
Times in minutes<br />
8.7-9.6 9.6-10.5 11.2-12.3<br />
24 Hour <strong>Ice</strong> Production<br />
Operating Pressures<br />
Harvest<br />
Time<br />
.75-2.00<br />
Air Temp.<br />
Around <strong>Ice</strong><br />
Water Temperature °F/°C<br />
Machine<br />
°F/°C<br />
50/10.0 70/21.1 90/32.2<br />
70/21.1 1870 1750 1530<br />
80/26.7 1870 1730 1510<br />
90/32.2 1860 1710 1490<br />
100/37.8 1830 1690 1470<br />
Based on average ice slab weight of 13- 14.125 lb<br />
Condenser<br />
Water<br />
Consumption<br />
Gal / per<br />
100 lbs of ice<br />
Air Temperature / Water Temperature °F<br />
77/59 90/70 110/90<br />
95 155 510<br />
Water regulating valve set to maintain 240 PSIG discharge pressure<br />
Air Temp.<br />
Around <strong>Ice</strong><br />
Machine<br />
°F/°C<br />
Freeze Cycle Harvest Cycle<br />
Discharge<br />
Pressure<br />
PSIG<br />
Suction<br />
Pressure<br />
PSIG<br />
Discharge<br />
Pressure<br />
PSIG<br />
Suction<br />
Pressure<br />
PSIG<br />
50/10.0 225-235 40-24 140-160 60-80<br />
70/21.1 225-275 45-26 155-175 60-85<br />
80/26.7 230-295 45-28 160-180 70-90<br />
90/32.2 255-320 46-29 170-195 80-100<br />
100/37.8 290-360 48-30 190-215 95-115<br />
110/43.3 325-400 49-30 225-250 110-130<br />
Suction pressure drops gradually throughout the freeze cycle<br />
7-20 Part Number 80-1634-3
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