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Refrigeration System | Section 7 |
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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%
•50Hz regular cube total production derate is 14%
S1800 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. |
| Freeze Time |
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Around Ice |
| Harvest | |||
Water Temperature °F/°C | |||||
Machine |
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| Time |
50/10.0 |
| 70/21.1 | 90/32.2 | ||
°F/°C |
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70/21.1 |
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80/26.7 |
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90/32.2 |
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100/37.8 |
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Times in minutes
24 Hour Ice Production
Air Temp. |
| Water Temperature °F/°C | |||
Around Ice |
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Machine | 50/10.0 | 70/21.1 | 90/32.2 | ||
°F/°C |
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70/21.1 | 1870 | 1750 | 1530 | ||
80/26.7 | 1870 | 1730 | 1510 | ||
90/32.2 | 1860 | 1710 | 1490 | ||
100/37.8 | 1830 | 1690 | 1470 | ||
Based on average ice slab weight of 13- 14.125 lb |
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Condenser |
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Water |
| Air Temperature / Water Temperature °F | |||
Consumption |
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| 77/59 |
| 90/70 | 110/90 | |
Gal / per |
| 95 |
| 155 | 510 |
100 lbs of ice |
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Water regulating valve set to maintain 240 PSIG discharge pressure
Operating Pressures
Air Temp. | Freeze Cycle | Harvest Cycle | ||
Around Ice | Discharge | Suction | Discharge | Suction |
Machine | Pressure | Pressure | Pressure | Pressure |
°F/°C | PSIG | PSIG | PSIG | PSIG |
50/10.0 | ||||
70/21.1 | ||||
80/26.7 | ||||
90/32.2 | ||||
100/37.8 | ||||
110/43.3 |
Suction pressure drops gradually throughout the freeze cycle
Part Number |