Manitowoc STH042 4/16, Technician'S Handbook

Page: 132 / 146

132 Part Number STH042 4/16
U0240 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
Freeze Time Harvest
Time
Water Temperature °F/°C
50/10 70/21 90/32
70/21 16.1-18.3 17.0-19.3 18.0-20.5
1.0-2.5
80/27 16.5-18.8 17.5-19.9 18.6-21.1
90/32 18.0-20.5 19.2-21.8 20.5-23.3
100/38 18.6-21.1 19.8-22.5 21.2-24.0
110/43 19.2-21.8 20.5-23.3 21.9-24.9
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Machine °F/°C
Water Temperature °F/°C
50/10 70/21 90/32
70/21 200 190 180
80/27 195 185 175
90/32 180 170 160
100/38 175 165 155
110/43 170 160 150
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Water regulating valve set to maintain 235 PSIG discharge pressure
Condenser water usage = 149 gallons per 100 lbs of ice at 90° F /70° F
Operating Pressures
Air Temp.
Around Ice
Machine
°F/°C
Freeze Cycle Harvest Cycle
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10 230-240 65-30 130-150 80-110
70/21 230-240 70-32 135-160 90-120
80/27 230-240 70-34 135-160 90-120
90/32 230-240 70-36 135-165 90-120
100/38 230-245 75-35 135-170 90-120
110/43 230-250 80-38 140-175 95-125
Suction pressure drops gradually throughout the freeze cycle