J320 - Manitowoc J250 Service Manual

Section 7
J320 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
Entering
Water Temperature ° ° ° ° F/° ° ° ° C
Condenser
° ° ° ° F/° ° ° ° C 50/10.0
70/21.1
11.7-13.4
80/26.7
13.6-15.5
90/32.2 16.1-18.4
100/37.8 19.6-22.3
1
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Condenser
50/10.0
° ° ° ° F/° ° ° ° C
70/21.1 320
80/26.7 280
90/32.2 240
100/37.8
200
1
Based on average ice slab weight of 2.93 - 3.31 lb.
2
Regular cube derate is 7%
Operating Pressures
Air Temp. Freeze Cycle
Entering Discharge
Condenser Pressure
° ° ° ° F/° ° ° ° C PSIG
50/10.0 200-250
70/21.1
200-250
80/26.7 220-280
90/32.2 230-320
100/37.8 270-360
110/43.3
280-380
1
Suction pressure drops gradually throughout the freeze cycle
Harvest
70/21.1 90/32.2
13.1-14.9 14.7-16.8
15.1-17.2 17.7-20.2
18.6-21.2 21.9-25.0
23.3-26.5 26.6-30.3
Water Temperature ° ° ° ° F/° ° ° ° C
70/21.1 90/32.2
290 260
250 220
210 180
170 150
Harvest Cycle
Suction Discharge Suction
Pressure Pressure Pressure
PSIG PSIG
50-36 150-180
50-36 160-190 80-100
50-36 170-200 90-110
52-38 180-220 90-120
54-40 200-250 95-140
56-42 210-260 95-150
J320 SERIES WATER-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp.
Around Ice
Machine
Time
° ° ° ° F/° ° ° ° C
70/21.1
80/26.7
90/32.2
1-2.5
100/37.8
1
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Machine
° ° ° ° F/° ° ° ° C
70/21.1
80/26.7
90/32.2
100/37.8
1
Based on average ice slab weight of 2.93 - 3.31 lb.
2
Regular cube derate is 7%
Condenser
Water
Consumption
Gal/24 hours
1
Water regulating valve set to maintain 230 PSIG discharge
pressure
PSIG
75-90
Operating Pressures
Air Temp.
Around Ice
Machine
° ° ° ° F/° ° ° ° C
50/10.0
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3
1
Suction pressure drops gradually throughout the freeze cycle
Refrigeration System
Freeze Time
Water Temperature ° ° ° ° F/° ° ° ° C
50/10.0 70/21.1 90/32.2
11.9-13.6 13.8-15.8 16.1-18.4
12.1-13.9 14.4-16.5 16.5-18.8
12.6-14.4 15.0-17.1 17.3-19.7
13.1-14.9 15.1-17.2 17.7-20.2
Water Temperature ° ° ° ° F/° ° ° ° C
50/10.0 70/21.1
315 275
310 265
300 255
290 250
90/32.2 Air Temperature Around Ice Machine
Water Temperature ° ° ° ° F/° ° ° ° C
50/10.0 70/21.1
280 460
Freeze Cycle
Discharge Suction Discharge
Pressure Pressure Pressure
PSIG PSIG PSIG
225-235 50-36 160-180
225-235 50-36 170-190
225-240 50-36 170-200
225-250 50-36 170-210
225-260 50-36 170-210
225-265 50-36 175-215
Harvest
Time
1-2.5
90/32.2
240
235
225
220
90/32.2
2300
Harvest Cycle
Suction
Pressure
PSIG
80-110
85-115
85-115
90-120
90-120
95-125
7-33