Expansion Valve With Shut-Off Valve
WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Different versions of the shut-off valve are available with different functions and with different names. For example, the Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- illustrated in the following is installed on an Audi Q5 hybrid in the battery cooling module. Refer to Refrigerant Circuit (vehicle-specific service information).
- The expansion valve -A- with the Hybrid Battery Refrigerant Shut-Off Valve 2 Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- -B- atomizes the flowing refrigerant and regulates the refrigerant flow rate to the evaporator in the battery cooling module for the Hybrid Battery Unit -AX1- so that the vapor only becomes gaseous at the evaporator output, depending on the heat transmission.
- If the Hybrid Battery Refrigerant Shut-Off Valve 2 Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- -B- is activated by the electronics and is open, it lets refrigerant flow through the expansion valve -A- to the evaporator in the battery cooling module.
- The expansion valve -A- with the Hybrid Battery Refrigerant Shut-Off Valve 2 Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- -B- is installed on vehicles with a battery cooling module. It is activated during A/C system operation, if it is necessary to cool the Hybrid Battery Unit -AX1-.
- If the Hybrid Battery Refrigerant Shut-Off Valve 2 Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- -B- is activated by the electronics (for example, by the Battery Regulation Control Module -J840-), it is open and lets the refrigerant flow according to its control characteristic toward the evaporator in the battery cooling module.
- The Hybrid Battery Refrigerant Shut-Off Valve 2 Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- -B- attached to the expansion valve -A- is activated, for example, by the Battery Regulation Control Module -J840-. Refer to Wiring Diagram and Vehicle Diagnostic Tester in the Guided Fault Finding Function for the A/C System and the Battery Regulation.
- If, for a vehicle with two evaporators (one in the A/C unit and one in the battery cooling module, for example on the Q5 Hybrid), the measured temperature on one of the evaporators corresponds to the specified value or the specified value falls short, but does not reach the required specified value on the other evaporator, the following adjustment is performed: the Battery Regulation Control Module -J840- activates the electric A/C compressor with increased speed (thereby increasing the A/C system cooling output and decreasing the pressure on the low pressure side as well as the evaporator temperature) via the Electric Drive Power and Control Electronics -JX1- and the A/C Compressor Control Module -J842-. If the specified value for the temperature falls short at one of the evaporators, the Battery Regulation Control Module Battery Regulation Control Module -J840- activates the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- or the Hybrid Battery Refrigerant Shut-Off Valve 2 -N517-, so that the evaporator which is too cold is no longer supplied with refrigerant. Refer to Vehicle Diagnostic Tester in the Guided Fault Finding Function for the A/C System.