Self-Contained Water-Cooled - Manitowoc Q450 Service Technician's Handbook

Q420/450 Series - Self-Contained Water-Cooled
Characteristics may vary depending on operating conditions.
CYCLE TIMES
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8
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
Based on average ice slab weight of 4.12 - 4.75 lb.
Regular cube derate is 7%
CONDENSER WATER CONSUMPTION
Air Temp. Around Ice
Machine 90°F/32.2°C
Gal/24 hours
Water regulating valve set to maintain 230 PSIG discharge pressure
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
Suction pressure drops gradually throughout the freeze cycle
Water Temperature °F/°C
50/10.0
9.9-11.7
10.1-11.9
10.4-12.2
10.6-12.5
50/10.0
50/10.0
Freeze Cycle
Discharge
Pressure Pressure
PSIG
235-245
235-245
235-245
235-245
235-245
240-250
Freeze Time
70/21.1
11.4-13.4 12.6-14.8
11.7-13.7 13.0-15.2
12.0-14.0 13.3-15.6
12.3-14.4 13.7-16.0
Water Temperature °F/°C
70/21.1
520
510
500
490
Water Temperature °F/°C
70/21.1
400 740
Suction Discharge
Pressure
PSIG
50-35 165-180
50-35 165-180
50-35 165-180
52-35 165-180
52-35 165-185
55-36 165-185
–129–
Harvest
Time
90/32.2
1-2.5
90/32.2
460 420
450 410
440 400
430 390
90/32.2
2400
Harvest Cycle
Suction
Pressure
PSIG PSIG
85-100
85-100
85-100
85-100
85-100
85-100