Manitowoc STH042 4/16, Technician'S Handbook

Page: 129 / 146

Part Number STH042 4/16 129
U0140 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 9.8-11.2 11.2-12.8 13.0-14.8
1.0-2.5
80/27 10.2-11.7 11.8-13.4 13.8-15.6
90/32 11.8-13.4 13.0-14.8 15.5-17.5
100/38 13.0-14.8 15.5-17.5 17.6-19.9
110/43 14.6-16.5 17.6-19.9 20.3-23.0
Times in minutes
24 Hour Ice Production
Air Temp. Around Ice
Machine °F/°C
Water Temperature °F/°C
50/10 70/21 90/32
70/21 135 120 105
80/27 130 115 100
90/32 115 105 90
100/38 105 90 80
110/43 95 80 70
Based on average ice slab weight of 1.06 - 1.19 lb (481 – 540 g).
Regular cube derate is 7%
Water regulating valve set to maintain 230 PSIG discharge pressure
Condenser water usage = 185 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
50/10 225-235 55-22 135-155 90-115
70/21 225-235 65-24 145-160 100-130
80/27 225-240 65-24 145-165 100-130
90/32 225-245 65-24 145-165 110-130
100/38 225-245 70-25 150-175 115-140
110/43 225-245 70-26 150-180 115-145
Suction pressure drops gradually throughout the freeze cycle