Manitowoc J250 User Manual

Section 7Refrigeration System
7-34
J420/450 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
9.5-11.2 10.9-12.8 12.3-14.4
80/26.7
10.4-12.2 12.0-14.1 13.7-16.0
1-2.5
90/32.2
12.0-14.0 14.1-16.5 16.5-19.2
100/37.8
13.3-15.6 16.0-18.6 18.3-21.3
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
540 480 430
80/26.7
500 440 390
90/32.2
440 380 330
100/37.8
400 340 300
1
Based on average ice slab weight of 4.12 - 4.75 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
195-240 45-30 150-170 75-90
70/21.1
205-260 47-33 165-180 80-100
80/26.7
230-265 50-35 165-185 80-100
90/32.2
260-290 55-36 190-210 90-110
100/37.8
290-340 60-38 215-235 105-125
110/43.3
330-395 75-40 235-255 125-140
1
Suction pressure drops gradually throughout the freeze cycle
J420/450 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
9.9-11.7 11.4-13.4 13.3-15.6
80/26.7
10.1-11.9 11.7-13.7 13.7-16.0
1-2.5
90/32.2
10.4-12.2 12.0-14.1 14.1-16.5
100/37.8
10.6-12.5 12.3-14.4 14.5-17.0
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
520 460 400
80/26.7
510 450 390
90/32.2
500 440 380
100/37.8
490 430 370
1
Based on average ice slab weight of 4.12 - 4.75 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
400 740 2400
1
Water regulating valve set to maintain 240 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
235-245 50-35 165-180 85-100
70/21.1
235-245 50-35 165-180 85-100
80/26.7
235-245 50-35 165-180 85-100
90/32.2
235-245 52-35 165-180 85-100
100/37.8
235-245 52-35 165-185 85-100
110/43.3
240-250 55-36 165-185 85-100
1
Suction pressure drops gradually throughout the freeze cycle

Manitowoc J250 Specifications

General

Brand	Manitowoc
Model	J250
Category	Ice Maker
Language	English