Manitowoc QD0202A, Service Manual

Page: 152 / 175

Refrigeration System Section 7
7-40
Part No. 80-1100-3
Q800 SERIES
Self-Contained Air-Cooled
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
24 Hour Ice Production
Operating Pressures
Q800 SERIES
Self-Contained Water-Cooled
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
24 Hour Ice Production
Operating Pressures
Air Temp.
Entering
Condenser
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 8.9-10.2 9.7-11.1 10.3-11.9
1-2.5
80/26.7 9.3-10.7 10.2-11.7 10.9-12.5
90/32.2 10.3-11.9 11.4-13.1 12.3-14.1
100/37.8 12.1-13.8 13.3-15.2 14.4-16.5
Times in minutes
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 800 740 700
80/26.7 770 710 670
90/32.2 700 640 600
100/37.8 610 560 520
Based on average ice slab weight of 5.75- 6.50 lb
Regular cube derate is 7%
Air Temp.
Entering
Condenser
°F/°C
Freeze Cycle Harvest Cycle
Discharg
e
Pressure
PSIG
Suction
Pressure
PSIG
Discharg
e
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 220-280 31-18 135-180 65-90
70/21.1 220-280 32-18 140-180 70-90
80/26.7 225-280 36-20 140-180 70-95
90/32.2 260-295 38-22 150-200 80-100
100/37.8 300-330 40-24 210-225 80-100
110/43.3 320-360 44-26 210-240 85-120
Suction pressure drops gradually throughout the freeze cycle
Air Temp.
Around Ice
Machine
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 8.7-10.1 9.5-11.0 10.9-12.5
1-2.5
80/26.7 8.9-10.2 9.7-11.1 11.0-12.7
90/32.2 9.0-10.3 9.8-11.3 11.2-12.9
100/37.8 9.1-10.5 10.0-11.5 11.4-13.1
Times in minutes
Air Temp.
Around Ice
Machine
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 810 750 670
80/26.7 800 740 660
90/32.2 790 730 650
100/37.8 780 720 640
Based on average ice slab weight of 5.75- 6.50lb
Regular cube derate is 7%
Condenser
Water
Consumption
90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
Gal/24 hours 640 1420 6000
Water regulating valve set to maintain 230 PSIG discharge pressure
Air Temp.
Around Ice
Machine
°F/°C
Freeze Cycle Harvest Cycle
Discharg
e
Pressure
PSIG
Suction
Pressure
PSIG
Discharg
e
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 225-235 33-20 160-185 65-85
70/21.1 225-235 34-20 165-185 70-85
80/26.7 225-235 34-20 165-185 70-85
90/32.2 225-235 36-22 165-185 70-85
100/37.8 225-235 36-22 165-185 70-85
110/43.3 225-240 38-24 170-190 75-90
Suction pressure drops gradually throughout the freeze cycle