Q420/450 Series - Manitowoc QR0320A Service Manual

Section 7

Q420/450 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 9.7-11.4
80/26.7 10.9-12.8
90/32.2 12.3-14.4
100/37.8 14.5-17.0
Times in minutes
24 Hour Ice Production
Air Temp. Water Temperature °F/°C
Entering
Condenser
50/10.0
°F/°C
70/21.1 530
80/26.7 480
90/32.2 430
100/37.8 370
Based on average ice slab weight of 4.12 - 4.75lb
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Air Temp.
Discharg
Entering
e
Condenser
Pressure
°F/°C
PSIG
50/10.0 195-260
70/21.1 200-260
80/26.7 230-265
90/32.2 260-290
100/37.8 290-340
110/43.3 195-260
Suction pressure drops gradually throughout the freeze cycle
Part No. 80-1100-3
Freeze Time
70/21.1 90/32.2
10.9-12.8 12.0-14.0
12.3-14.4 13.3-15.6
14.1-16.5 15.5-18.0
16.5-19.2 18.3-21.3
70/21.1 90/32.2
480
430
380
330
Harvest Cycle
Suction Discharge Suction
Pressure Pressure Pressure
PSIG PSIG
45-30 150-170
47-33 165-180
50-35 165-185
55-36 190-210
60-38 215-235 105-125
45-30 235-255 125-140
Q420/450 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.
Harvest Around Ice
Time Machine
°F/°C
70/21.1
80/26.7
1-2.5
90/32.2
100/37.8
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
440
80/26.7
400
90/32.2
350
100/37.8
300
Based on average ice slab weight of 4.12 - 4.75 lb.
Regular cube derate is 7%
Condenser
Water
Consumption
Gal/24 hours
Water regulating valve set to maintain 230 PSIG discharge pressure
PSIG
75-90
Operating Pressures
80-100
80-100
Air Temp.
Around Ice
90-110
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
Refrigeration System
Freeze Time
Water Temperature °F/°C
50/10.0 70/21.1
9.9-11.7 11.4-13.4 12.6-14.8
10.1-11.9 11.7-13.7 13.0-15.2
10.4-12.2 12.0-14.0 13.3-15.6
10.6-12.5 12.3-14.4 13.7-16.0
Water Temperature °F/°C
50/10.0 70/21.1
520 460
510 450
500 440
490 430
90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
50/10.0 70/21.1
400 740
Freeze Cycle
Discharg
Suction Discharge
e
Pressure Pressure
Pressure
PSIG
PSIG
235-245 50-35 165-180
235-245 50-35 165-180
235-245 50-35 165-180
235-245 52-35 165-180
235-245 52-35 165-185
240-250 55-36 165-185
Harvest
Time
90/32.2
1-2.5
90/32.2
420
410
400
390
90/32.2
2400
Harvest Cycle
Suction
Pressure
PSIG PSIG
85-100
85-100
85-100
85-100
85-100
85-100
7-37