Carrier AquaEdge 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XR: Controls operation and troubleshooting Start-up, operation and maintenance instructions Start-up, operation and maintenance instructions

Carrier AquaEdge 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 24 page image

24MODIFY EQUIPMENT CONFIGURATION IF NECESSARYThe EQUIPMENT SERVICE table has screens to select, view,or modify parameters. Carrier’s certified drawings have theconfiguration values required for the jobsite. Modify these val-ues only if requested. Modifications can include:• Chilled water reset• Entering chilled water control (Enable/Disable)• 4 to 20 mA demand limit• Auto restart option (Enable/Disable)• Remote contact option (Enable/Disable)See the 19XR with PIC 5 Controls Operation and Trouble-shooting guide for more details about these functions.Perform a Controls Test (Quick Test/Quick Calibration)Check the safety controls status by performing an automatedcontrols test. Actuators with feedback like inlet guide vane ac-tuator need to be calibrated using the Quick Calibration menuprior to unit startup. Other controls tests can be done using theQuick Test Menu. The Quick Test or Quick Calibration menucan be accessed from the MAIN MENU. (The QUICK TESTscreen can only be accessed when the chiller is in STOPmode.) On the QUICK TEST table screen, select a test to beperformed.The Quick Test checks all outputs and inputs for function. Inorder to successfully proceed with the controls test, the com-pressor should be off, no alarms showing, and voltage shouldbe within ±10% of rating plate value. Each test asks the opera-tor to confirm the operation is occurring and whether or not tocontinue. If an error occurs, the operator can try to address theproblem as the test is being done or note the problem and pro-ceed to the next test.NOTE: If during the controls test the guide vanes do not open,verify the low pressure alarm is not active. (An active lowpressure alarm causes the guide vanes to close.)NOTE: The oil pump test will not energize the oil pump ifcooler pressure is below –5 psig (–35 kPa).When the controls test is finished, the test stops and theQUICK TEST menu displays. If a specific automated test pro-cedure is not completed, access the particular control test totest the function when ready. For information about calibration,see the sections Checking Pressure Transducers, page 47, andHigh Altitude Locations, page 47.Charge Refrigerant into ChillerThe standard 19XR chiller is shipped with the refrigerant al-ready charged in the vessels. However, the 19XR chiller maybe ordered with a nitrogen holding charge of 15 psig (103 kPa).Evacuate the nitrogen from the entire chiller, and charge thechiller from refrigerant cylinders.CHILLER EQUALIZATION WITHOUT A PUMPOUT UNITTo equalize the pressure differential on a refrigerant isolated 19XRchiller, use the terminate lockout function PUMPDOWN/LOCK-OUT (located in the Maintenance Menu). This helps to turn onpumps and advises the operator on proper procedures.The following steps describe how to equalize refrigerant pres-sure in an isolated 19XR chiller without a pumpout unit.1. Access terminate lockout function on the MaintenanceMenu. (Alternatively, the Quick Test provides a means forcooler and condenser pump control.)2. Slowly open the refrigerant charging valves. The chillercooler and condenser pressures will gradually equalize.This process takes approximately 15 minutes.3. Once the pressures have equalized, the cooler isolationvalve, the condenser isolation valve, and the hot gas isola-tion valve may now be opened. Refer to Fig. 23 and 24 forthe location of the valves.CHILLER EQUALIZATION WITH FREE-STANDINGPUMPOUT UNITThe following steps describe how to equalize refrigerant pres-sure on an isolated 19XR chiller using the pumpout unit.1. Access the terminate lockout function on the PUMP-DOWN/LOCKOUT screen (located in the MaintenanceMenu).2. Open valve 4 on the pumpout unit and open valves 1a and1b on the chiller cooler and condenser, Fig. 23 and 24.Slowly open valve 2 on the pumpout unit to equalize thepressure. This process takes approximately 15 minutes.3. Once the pressures have equalized, the discharge isolationvalve, cooler isolation valve, optional hot gas bypass isola-tion valve, and refrigerant isolation valve can be opened.Close valves 1a and 1b, and all pumpout unit valves.CAUTIONThe transfer, addition, or removal of refrigerant in springisolated chillers may place severe stress on and damage ex-ternal piping if springs have not been blocked in both upand down directions.CAUTIONAlways operate the condenser and chilled water pumpsduring charging operations to prevent freeze-ups.CAUTIONWhen equalizing refrigerant pressure on the 19XR chillerafter service work or during the initial chiller start-up, donot use the discharge isolation valve to equalize. Acharging hose (connected between the charging valves ontop of the cooler and condenser) should be used as theequalization valve. Failure to follow this procedure maydamage equipment.IMPORTANT: Turn on the chilled water and condenserwater pumps to prevent freezing.WARNINGWhenever turning the discharge isolation valve, be sure toreattach the valve locking device. This prevents the valvefrom opening or closing during service work or duringchiller operation. Failure to follow this procedure maydamage equipment and result in bodily injury.IMPORTANT: Turn on the chilled water and condenserwater pumps to prevent freezing.