Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts; Q200 Series - Manitowoc QR0320A Service Manual

Section 7
Cycle Time/24 Hour Ice Production/
Refrigerant Pressure Charts

Q200 SERIES

Self-Contained Air-Cooled
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Entering
Water Temperature °F/°C
Condenser
50/10.0
°F/°C
70/21.1 11.5-13.5
80/26.7 13.8-16.1
90/32.2 16.1-18.7
100/37.8 19.8-23.0
Times in minutes
24 Hour Ice Production
Air Temp. Water Temperature °F/°C
Entering
Condenser
50/10.0
°F/°C
70/21.1 270
80/26.7 230
90/32.2 200
100/37.8 165
Based on average ice slab weight of 2.44 - 2.81 lb
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Air Temp.
Entering
Discharge
Condenser
Pressure
°F/°C
PSIG
50/10.0 195-260
70/21.1 195-260
80/26.7 210-270
90/32.2 240-290
100/37.8 270-330
110/43.3 310-390
Suction pressure drops gradually throughout the freeze cycle
Part No. 80-1100-3
Freeze Time
70/21.1 90/32.2
13.8-16.1 15.2-17.8
15.6-18.2 17.0-19.8
18.6-21.6 20.5-23.8
23.6-27.4 25.5-29.6
70/21.1 90/32.2
230
205
175
140
Harvest Cycle
Suction Discharge
Pressure Pressure Pressure
PSIG PSIG
60-28 120-190
60-28 120-190
65-28 160-190
70-30 190-210
70-35 220-240
85-40 250-270
Q200 SERIES
Self-Contained Water-Cooled
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Around Ice
Machine
°F/°C
Harvest
70/21.1
Time
80/26.7
90/32.2
100/37.8
1.0-2.5
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
210
100/37.8
190
Based on average ice slab weight of 2.44 - 2.81 lb
160
Regular cube derate is 7%
130
Condenser
Water
Consumption
Gal/24 hours
Suction
Water regulating valve set to maintain 230 PSIG discharge pressure
PSIG
Operating Pressures
85-110
Air Temp.
85-110
Around Ice
90-110
Machine
100-120
°F/°C
120-140
50/10.0
120-150
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3
Suction pressure drops gradually throughout the freeze cycle
Refrigeration System
Freeze Time
Water Temperature °F/°C
50/10.0 70/21.1
11.5-13.5 12.8-15.0
12.0-14.1 13.5-15.7
12.6-14.7 14.1-16.5
13.1-15.4 14.8-17.3
Water Temperature °F/°C
50/10.0 70/21.1
270 245
260 235
250 225
240 215
90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
50/10.0 70/21.1
240 480
Freeze Cycle
Discharge Suction Discharge
Pressure Pressure Pressure
PSIG PSIG
225-235 60-28
225-235 60-28
225-240 60-28
225-245 65-30
225-250 70-32
225-260 75-34
Harvest
Time
90/32.2
14.5-16.9
15.2-17.8
1-2.5
16.1-18.7
17.0-19.8
90/32.2
220
210
200
190
90/32.2
2100
Harvest Cycle
Suction
Pressure
PSIG PSIG
170-200 90-110
170-200 90-110
175-205 90-110
175-205 90-115
180-210 90-115
185-215 90-120
7-33