Manitowoc S600M, Service Manual

Page: 86 / 103

Refrigeration System Section 7
7-20
Part Number 80-1630-3
Cycle Time/24 Hour Ice Production/
Refrigerant Pressure Charts
These charts are used as guidelines to verify correct ice
machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Refer to “OPERATIONAL ANALYSIS TABLE” for the
list of data that must be collected for refrigeration
diagnostics. This list includes: before beginning
service, ice production check, installation/visual
inspection, water system checklist, ice formation
pattern, safety limits, comparing evaporator inlet/
outlet temperatures, discharge and suction pressure
analysis.
• Ice production checks that are within 10% of the
chart are considered normal. This is due to variances
in water and air temperature. Actual temperatures
will seldom match the chart exactly.
• Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are within
the range indicated.
• Record beginning of freeze cycle suction pressure
one minute after water pump energizes.
• Regular cube production derate is 7%
• 50Hz production derate is 7%
S600M SERIES
Self-Contained Water-Cooled
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
24 Hour Ice Production
Operating Pressures
Air Temp.
Around Ice
Machine
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 7.6-9.0 7.9-9.4 8.6-10.1
1-2.5
80/26.7 7.8-9.2 8.1-9.5 8.8-10.3
90/32.2 7.9-9.4 8.2-9.7 8.8-10.3
100/37.8 8.1-9.5 8.4-9.9 9.1-10.7
Times in minutes
Air Temp.
Around Ice
Machine
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
70/21.1 650 630 590
80/26.7 640 620 580
90/32.2 630 610 580
100/37.8 620 600 560
Based on average ice slab weight of 4.12 - 4.75lb
Air Temp.
Around Ice
Machine
°F/°C
Freeze Cycle Harvest Cycle
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 225-235 36-26 140-190 65-95
70/21.1 225-235 36-26 140-190 65-95
80/26.7 225-245 40-28 150-195 70-100
90/32.2 230-255 40-29 160-200 70-100
100/37.8 230-260 40-30 170-205 75-105
110/43.3 230-260 40-30 180-210 80-110
Suction pressure drops gradually throughout the freeze cycle