Carrier 61WG 020 Installation, Operation And Maintenance Instructions

Contents

5220 - AQUASNAP MAINTENANCE PROGRAMAll maintenance operations must be carried out bytechnicians who have been trained on Carrier products,observing all Carrier quality and safety standards.20.1 - Maintenance scheduleRegular maintenance is indispensable to optimise equip-ment operating life and reliability. Maintenance operationsmust be carried out in accordance with the schedules below:Service FrequencyA WeeklyB MonthlyC AnnuallyD Special casesIf the equipment does not operate normally duringmaintenance operations, refer to the chapter on diagnosticsand breakdowns of the 61WG/30WG/30WGA Pro-Dialog+Controls manual).IMPORTANT: Before each equipment maintenanceoperation please ensure that:• The unit is in the OFF position• It is impossible for the unit to restart automaticallyduring maintenance.20.2 - Description of the maintenance operationsThe equipment is supplied with polyolester oil (POE). Useonly Carrier-approved oil. On request Carrier can carry outan oil analysis of your installation.Service AFull-load operating testVerify the following values:• Compressor high-pressure side discharge pressure• Compressor low-pressure side suction pressure• Charge visible in the sight glass• Temperature difference between the heat exchangerwater entering and leaving temperature.Verify the alarm statusService BCarrier out the operations listed under Service A.Refrigerant circuit• Full-load operating test. In addition to the operationsdescribed under Service A, check the following values:- Compressor discharge pressure- Compressor oil level- Actual liquid subcooling- Overheating at the expansion device• Verify the charge status by checking the colour indicatorof the sight glass. If the colour has turned to yellow,change the charge and replace the filter drier cartridgesafter carrying out a leak test of the circuit.Electrical checks• Check the tightening of the electric connections,contactors, disconnect switch and transformer.• Check the phase direction upstream of the unit and inthe customer’s electrical data table.• Check the status of the contactors and fuses.• Carry out a quick test (refer to the 61WG/30WG/ 30WGAPro-Dialog+ Controls manual).Mechanical checks• Verify the correct operation of the evaporator andcondenser pumps with the Quick Test function.• Verify the correct operation of cooling fans, speedconverter and condensing pumps.Water circuit checks• Check the leak-tightness of the circuit.Service CCarry out the operations listed under Service B.Refrigerant circuit• Check the leak-tightness of the circuit and ensure thatthere is no piping damage.• Carry out an oil contamination test. If acid, water ormetallic particles are present, replace the oil in the circuit.• Verify the tightening of the thermostatic mechanism ofthe expansion device.• Full-load operating test. In addition to the checks carriedout under Service B, validate the value between leavingwater and the saturated evaporating temperature.• Check the operation of the high-pressure switch(es).Replace them if there is a fault.• Check the fouling of the filter drier (by checking thetemperature difference in the copper piping). Replaceit if necessary.Electrical checks• Check the status and insulation of the electrical cables.• Check the phase/earth insulation of the compressorsand pumps.• Check the compressor and pump winding status.Mechanical checks• Check that no water has penetrated into the control box.• Clean the filter of the air inlet grille and if necessaryreplace the filter.Water circuit checks• Clean the water filter.• Purge the circuit with air.• Verify the correct operation of the water flow switch.• Check the status of the thermal piping insulation.• Check the water flow by checking the heat exchangerpressure difference (using a pressure gauge).• Check the concentration of the anti-freeze protectionsolution (ethylene glycol or polyethylene glycol).• Check the heat transfer fluid status or the water quality.• Check the steel pipe corrosion.