Carrier 69NT40-561-399 Operation And Service Manual

Contents

7–27 T-36510.Remove the unloader connection to the compressor. Discard the O-ring as it will be replaced. Ensure thatthe O-ring is not left attached to the compressor connection.11. Remove the DUV coil to bracket mounting screws.12.Slide the bracket assembly out (right and forwards between suction and discharge lines).13.Wet wrap the suction service valve and Un-braze the remaining section of line to the bell connection at thesuction service valve.14.Clean pipework stubs on both unit and valve assembly in preparation for brazing.15.Install coil onto the replacement valve stem and slide into place.16.Loosely couple the refrigerant connections and secure the coil to the mounting bracket.17.Lubricate the gland shoulder area and O-ring (42-00243-04) with refrigerant oil and fit the economizer con-nection to the compressor.18.Re-secure the coil to the bracket.19.Torque unloader connection to the compressor 24.5 to 27 Nm (18 to 20 ft-lbs).20.Insert heat shield behind the two braze points.21.Wet rag both the DUV, DLV and the suction service valve bodies and clamp. Failure to wet rag the body andmounts body may result in future failure. Using silver solder braze both connections.22.Replace the filter drier.23.If magnet was used in step 3; remove the DUV coil and place magnet on the stem to open the valve forevacuation. If jumper procedure was used in step 3, reconnect unit to power and turn on the circuit breakerto again power the DUV.24.Evacuate the unit to 1000 Microns.25.On completion of the vacuum, remove the magnet and reinstall the DUV coil. If a jumper was used, turn offthe circuit breaker and disconnect power. Remove jumper and reconnect the X1 wire to the black trans-former wire. Reinstall and secure the KA6 wire to the KA plug at the controller.26.Weigh the proper refrigerant charge into the unit as per the units operation and service manual and performa leak check of the system.27.Reposition and secure the wires and suction line insulation.28.Replace the guard under the control box.29.If changed under the units warranty, tag part with unit information and cause of failure.30.If possible collect unit data download for future failure analysis.7.22 VALVE OVERRIDE CONTROLSController function code Cd41 is a configurable code that allows timed operation of the automatic valves for trou-bleshooting. Test sequences are provided in Table 7–1. Capacity mode (CAP) allows alignment of the economizersolenoid valve in the standard and economized operating configurations. DLV and DUV Capacity Modulation,%Setting (PCnt) and Electronic Expansion Valve (EEV) allows opening of the digital unloader valve and electronicexpansion valve, respectively, to various percentages. If the unit is equipped with an LIV, the Liquid Valve Settingallows the LIV to be automatically controlled, or manually opened and closed.The Override Timer (tIM) selection is also provided to enter a time period of up to five minutes, during which the over-ride(s) are active. If the timer is active, valve override selections will take place immediately. If the timer is not active,changes will not take place for a few seconds after the timer is started. When the timer times out, the override functionis automatically terminated and the valves return to normal machinery control. To operate the override:1. Press the CODE SELECT key then press an ARROW key until Cd41 is displayed in the left window. Theright window will display a controller communications code.2. Press the ENTER key. The left display will show a test name alternating with the test setting or time remaining.Use an ARROW key to scroll to the desired test. Press the ENTER key, SELCt will appear in the left display.