Manitowoc QD0202A, Service Manual

Page: 148 / 175

Refrigeration System Section 7
7-36
Part No. 80-1100-3
Q370 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
Q370 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 10.3-11.7 11.7-13.4 12.6-14.4
1-2.5
80/26.7 11.3-12.9 12.6-14.4 13.9-15.8
90/32.2 12.9-14.7 13.9-15.8 15.4-17.6
100/37.8 14.5-16.5 16.1-18.4 17.3-19.7
Times in minutes
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 360 320 300
80/26.7 330 300 275
90/32.2 295 275 250
100/37.8 265 240 225
Based on average ice slab weight of 2.94 - 3.31lb
Air Temp.
Entering
Condenser
°F/°C
Freeze Cycle Harvest Cycle
Discharg
e
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 200-250 60-34 145-165 75-95
70/21.1 215-250 60-36 150-170 85-100
80/26.7 250-290 65-38 165-185 90-110
90/32.2 260-330 70-40 175-195 100-120
100/37.8 300-380 80-41 195-220 130-150
110/43.3 310-390 80-42 200-225 135-155
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 10.3-11.7 11.0-12.5 12.2-13.9
1-2.5
80/26.7 10.6-12.1 11.3-12.9 12.6-14.4
90/32.2 11.0-12.5 11.7-13.4 13.1-14.4
100/37.8 11.3-12.9 12.2-13.9 13.6-15.5
Times in minutes
Air Temp.
Around Ice
Machine
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 360 340 310
80/26.7 350 330 300
90/32.2 340 320 290
100/37.8 330 310 280
Based on average ice slab weight of 2.94 - 3.31lb
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 220 490 3700
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
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 225-235 60-32 150-170 85-100
70/21.1 225-235 60-33 150-170 85-105
80/26.7 225-240 65-36 155-175 90-110
90/32.2 225-240 68-38 155-175 90-110
100/37.8 235-260 75-40 175-200 100-120
110/43.3 240-265 85-40 185-205 105-125
Suction pressure drops gradually throughout the freeze cycle