
Section 7 | Refrigeration System |
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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 “Refrigeration System Diagnostics” for the data that must be collected. This list includes: before beginning service, ice production check, installation/ visual inspection, water system checklist, ice formation pattern, safety limits, safeguards 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.
•All pressure readings must be obtained at the ice machine head section. Lineset length will affect pressures at the condensing unit.
QF400 SELF-CONTAINED AIR COOLED
NOTE: These characteristics may vary depending on operating conditions.
24 Hour Ice Production
Air Temp. | Water Temperature °F/°C | ||
Entering |
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Condenser | 50/10.0 | 70/21.1 | 90/32.2 |
°F/°C |
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70/ 21.1 | 395 | 360 | 335 |
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80/26.7 | 375 | 320 | 300 |
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90/32.2 | 335 | 300 | 270 |
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100/37.8 | 295 | 250 | 240 |
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110/43.3 | 255 | 230 | 225 |
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Operating Pressures
Air Temp. Entering | Freeze Cycle | ||
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Discharge | Suction | ||
Condenser °F/°C | |||
Pressure PSIG | Pressure PSIG | ||
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50/10.0 | |||
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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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110/43.3 | |||
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Part No. | Revised 8/2003 |
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