■Daily checksTo maintain the unit in prime operating condition, check the following items daily, making adjustments where necessary and keeping a record of all checks.Values under “Passing grade” are indicated for refrigerating machines under typical operating conditions.When to checkCheck item Check method Passing grade ResultDaily Seasonally1. discharge pressure2. discharge pressure difference between compressors3. suction pressure4. suction pressure difference between compressors5. power supply6. condenser water temperature at outlet7. chilled water temperature at outlet8. vibrations and noises9. ambient temperature1 .refrigerant charge2.machine oil charge3.water quality1. Check the high pressure value on operating panel2.Check the high pressure value on operating panel3.Check the suction pressure value on operating panel4.Check the suction pressure value on operatinq panel5.Check using a voltmeter6.Check the thermometer7.Check the thermometer8.Listen for noises and fell for vibrations9.Check the thermometer1.Check the sight glass2.Check thecompressor oil gauge3.According to “water quality standards”0.7-1.1Mpa^O.IMPa0.16~0.5MPa^0.05MPaWithin ±10% of the rated voltage30-40°C5-10°CNo abnormal vibrations and noises^40 °CNo bubblesMachine oil is within range on the gaugeSee the page 46
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