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Refrigeration System
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%
7-20
S600M 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
7.6-9.0
80/26.7
7.8-9.2
90/32.2
7.9-9.4
100/37.8
8.1-9.5
Times in minutes
24 Hour Ice Production
Air Temp.
Water Temperature °F/°C
Around Ice
Machine
50/10.0
°F/°C
70/21.1
650
80/26.7
640
90/32.2
630
100/37.8
620
Based on average ice slab weight of 4.12 - 4.75lb
Operating Pressures
Freeze Cycle
Air Temp.
Around Ice
Discharge
Machine
Pressure
°F/°C
PSIG
50/10.0
225-235
70/21.1
225-235
80/26.7
225-245
90/32.2
230-255
100/37.8
230-260
110/43.3
230-260
Suction pressure drops gradually throughout the freeze cycle
Section 7
Freeze Time
70/21.1
90/32.2
7.9-9.4
8.6-10.1
8.1-9.5
8.8-10.3
8.2-9.7
8.8-10.3
8.4-9.9
9.1-10.7
70/21.1
90/32.2
630
620
610
600
Harvest Cycle
Suction
Discharge
Pressure
Pressure
Pressure
PSIG
PSIG
36-26
140-190
36-26
140-190
40-28
150-195
40-29
160-200
40-30
170-205
40-30
180-210
Part Number 80-1630-3
Harvest
Time
1-2.5
590
580
580
560
Suction
PSIG
65-95
65-95
70-100
70-100
75-105
80-110
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