Manitowoc J-1300, Service Manual

Page: 136 / 165

Section 7 Refrigeration System
7-31
Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts
J200 SERIES
SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp. Freeze Time Harvest
Entering
Condenser
Water Temperature °°°° F/ °°°° C
Time
°°°° F/ °°°° C 50/10.0 70/21.1 90/32.2
70/21.1 11.5-13.5 13.8-16.1 15.2-17.8
80/26.7 12.6-14.7 15.2-17.8 17.5-20.4 1-2.5
90/32.2 14.5-16.9 17.0-19.8 19.8-23.0
100/37.8 17.0-19.8 20.5-23.8 23.6-27.4
1
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Water Temperature °°°° F/ °°°° C
Condenser
°°°° F/ °°°° C
50/10.0 70/21.1 90/32.2
70/21.1 270 230 210
80/26.7 250 210 185
90/32.2 220 190 165
100/37.8 190 160 140
1
Based on average ice slab weight of 2.44 - 2.81 lb.
2
Regular cube derate is 7%
Operating Pressures
Air Temp. Freeze Cycle Harvest Cycle
Entering
Condenser
°°°° F/ °°°° C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0
190-260 60-28 120-190 85-110
70/21.1
190-260 60-28 120-190 85-110
80/26.7 210-270 65-28 160-190 90-110
90/32.2 240-290 70-30 190-210 100-120
100/37.8 270-330 70-35 220-240 120-140
110/43.3 310-390 90-40 250-270 120-150
1
Suction pressure drops gradually throughout the freeze cycle
J200 SERIES WATER-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp. Freeze Time Harvest
Around Ice
Machine
Water Temperature °°°° F/ °°°° C
Time
°°°° F/ °°°° C 50/10.0 70/21.1 90/32.2
70/21.1
11.8-13.8 14.5-16.9 17.0-19.8
80/26.7
12.0-14.1 14.5-16.9 17.0-19.8
1-2.5
90/32.2
12.6-14.7 15.2-17.8 18.2-21.0
100/37.8
12.6-14.7 15.2-17.8 18.2-21.0
1
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Water Temperature °°°° F/ °°°° C
Machine
°°°° F/ °°°° C
50/10.0 70/21.1 90/32.2
70/21.1
265 220 190
80/26.7
260 220 190
90/32.2
250 210 180
100/37.8
250 210 180
1
Based on average ice slab weight of 2.44 - 2.81 lb.
2
Regular cube derate is 7%
Condenser 90/32.2 Air Temperature Around Ice Machine
Water Water Temperature °°°° F/ °°°° C
Consumption 50/10.0 70/21.1 90/32.2
Gal/24 hours 230 430 2230
1
Water regulating valve set to maintain 230 PSIG discharge
pressure
Operating Pressures
Air Temp. Freeze Cycle Harvest Cycle
Around Ice
Machine
°°°° F/ °°°° C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0
225-240 60-28 170-200 90-110
70/21.1
225-240 60-28 170-200 90-110
80/26.7
225-240 60-28 175-205 90-110
90/32.2
225-245 65-28 175-205 90-115
100/37.8
225-245 70-30 180-210 90-115
110/43.3
225-250 75-30 185-215 90-120
1
Suction pressure drops gradually throughout the freeze cycle