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

Q800 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 5.75 - 6.50 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
Discharge
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
8.7-10.1
8.9-10.2
9.0-10.3
9.1-10.5
50/10.0
Freeze Cycle
Suction
Pressure Pressure
PSIG
225-235
225-235
225-235
225-235
225-235
225-240
Freeze Time
70/21.1
9.5-11.0
9.7-11.1
9.8-11.3
10.0-11.5
Water Temperature °F/°C
50/10.0
810
800
790
780
Water Temperature °F/°C
70/21.1
640 1420
Discharge
Pressure
PSIG PSIG
33-20 160-185
34-20 165-185
34-20 165-185
36-22 165-185
36-22 165-185
38-24 170-190
–135–
Harvest
90/32.2
10.9-12.5
11.0-12.7
11.2-12.9
11.4-13.1
70/21.1 90/32.2
750
740
730
720
90/32.2
6000
Harvest Cycle
Suction
Pressure
PSIG
65-85
70-85
70-85
70-85
70-85
75-90
Time
1-2.5
670
660
650
640