Manitowoc QR0320A Service Manual page 158

Refrigeration System
Q1800 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
Water Temperature °F/°C
Machine
50/10.0
°F/°C
70/21.1 8.7-9.6
80/26.7 9.0-9.9
90/32.2 9.1-10.1
100/37.8 9.2-10.1
Times in minutes
24 Hour Ice Production
Air Temp. Water Temperature °F/°C
Around Ice
Machine
50/10.0
°F/°C
70/21.1 1840
80/26.7 1780
90/32.2 1760
100/37.8 1750
Based on average ice slab weight of 13.0- 14.12lb
Regular cube derate is 7%
Condenser
Water
Consumption
50/10.0
Gal/24 hours 2000
Water regulating valve set to maintain 240 PSIG discharge pressure
Operating Pressures
Freeze Cycle
Air Temp.
Discharg
Around Ice
e
Machine
Pressure
°F/°C
PSIG
50/10.0 235-245
70/21.1 235-245
80/26.7 235-245
90/32.2 235-250
100/37.8 235-255
110/43.3 235-260
Suction pressure drops gradually throughout the freeze cycle
7-46
Freeze Time
70/21.1 90/32.2
9.6-10.5 10.8-11.9
9.6-10.6 10.8-11.9
9.7-10.7 10.9-12.0
9.8-10.7 11.1-12.1
70/21.1 90/32.2
1690 1520
1680 1520
1670 1510
1660 1490
90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
70/21.1 90/32.2
2670
Harvest Cycle
Discharg
Suction Suction
e
Pressure Pressure
Pressure
PSIG
PSIG
36-20 170-190
38-20 170-190
40-20 170-190
42-22 175-190
44-22 175-190
46-22 175-190
Q1800 SERIES
Remote
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Harvest Entering
Time Condenser
°F/°C
-20/-28.9 to
70/21.1
1-2.5
80/26.7
90/32.2
100/37.8
110/43.3
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3
Based on average ice slab weight of 13.0 - 14.12lb
Regular cube derate is 7%
Ratings with JC1895 condenser, dice or half dice cubes
7750
Operating Pressures
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
PSIG
50/10.0
65-80
70/21.1
65-80
80/26.7
65-80
90/32.2
65-80
100/37.8
65-80
110/43.3
65-80
Suction pressure drops gradually throughout the freeze cycle
Freeze Time
Water Temperature °F/°C
50/10.0 70/21.1
9.1-10.0 9.8-10.8
9.3-10.2 10.1-11.1
9.5-10.5 10.3-11.4
10.1-11.1 11.1-12.2
11.0-12.1 12.1-13.2
Water Temperature °F/°C
50/10.0 70/21.1
1770 1650
1735 1615
1700 1580
1620 1480
1500 1380
Freeze Cycle
Discharg
Suction Discharge
e
Pressure Pressure
Pressure
PSIG
PSIG
220-250 38-24 160-180
220-260 40-24 170-180
250-270 48-24 175-190
250-280 50-24 180-200
270-300 52-28 205-215
300-350 54-28 205-230
Section 7
Harvest
Time
90/32.2
10.7-11.7
10.9-12.0
1-2.5
11.1-12.2
11.9-13.0
12.7-13.9
90/32.2
1540
1510
1480
1400
1320
Harvest Cycle
Suction
Pressure
PSIG PSIG
60-80
60-80
70-90
80-90
80-95
80-100
Part No. 80-1100-3