Service manual

44
Refrigeration System
Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts
Q1300 SERIES WATER-COOLED
NOTE: These characteristics may vary depending
on operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp. Freeze Time Harvest
Around Ice
Machine
Water Temperature °F/°C
Time
°F/°C
50/10.0 70/21.1 90/32.2
70/21.1
9.0-10.1 9.8-10.9 11.4-12.6
80/26.7
9.1-10.1 9.8-11.0 11.6-12.9
1-2.5
90/32.2
9.2-10.3 10.0-11.2 12.0-13.3
100/37.8
9.4-10.5 10.1-11.3 12.2-13.6
1
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Water Temperature °F/°C
Machine
°F/°C
50/10.0 70/21.1 90/32.2
70/21.1
1370 1280 1120
80/26.7
1360 1270 1100
90/32.2
1340 1250 1070
100/37.8
1320 1240 1050
1
Based on average ice slab weight of 10.0 - 11.0 lb.
2
Regular cube derate is 7%
Condenser 90/32.2 Air Temperature Around Ice Machine
Water
Water Temperature °F/°C
Consumption 50/10.0 70/21.1 90/32.2
Gal/24 hours
1150 2220 7400
1
Water regulating valve set to maintain 240 PSIG discharge
pressure
Operating Pressures
Air Temp. Freeze Cycle Harvest Cycle
Around Ice
Machine
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0
235-245 40-18 150-180 70-80
70/21.1
235-245 40-18 150-180 70-80
80/26.7
235-245 40-20 150-180 70-80
90/32.2
235-250 42-20 150-180 70-80
100/37.8
235-255 44-20 150-180 70-80
110/43.3
240-265 46-20 150-180 70-80
1
Suction pressure drops gradually throughout the freeze cycle