A/C Service Station On Refrigerant Circuit, Connecting
Connecting
- Work procedure may vary depending on the type of tools selected (the tool-specific operating instructions should therefore be followed).
Perform the procedure as described in the A/C service station Owner's Manual. Refer to A/C service station Owner's Manual.
The charging hoses are to be connected as follows to prevent the ingress of air or moisture into the refrigerant circuit:
-- On vehicles with a high-voltage system, switch off (deactivate) the "auxiliary climate control" function. Refer to the Owner's Manual and Infotainment/MMI Operating Manual.
-- Switch off the ignition.
-- Connect the A/C service station to the power supply.
-- Switch on the A/C service station and the related Owner's Manual according to specification. Refer to A/C service station Owner's Manual.
-- Remove the closure caps from the service connections. Refer to Refrigerant Circuit and the vehicle-specific refrigerant circuit.
-- Evacuate the charging hoses if necessary.
-- Check the refrigerant circuit service connections of debris and corrosion and if necessary clean.
Dirt or a rough surface on the service connections due to corrosion can cause seal damage, which can then cause premature failure of the quick-release couplings.
-- Connect the quick-release couplings to the refrigerant circuit service connections.
Risk of damaging the A/C compressor or the A/C service station.
A short circuit between the high and low pressure side is possible when opening the valves with the A/C system is on.
- Never open the valves in the high or low pressure side when the A/C system is on.
-- Install the hand wheel for the low pressure side quick-release coupling connection just far enough into the until the valve is securely opened inside the service connection (pay attention to the pressure gauge, do not put too much pressure on the valve).
-- Perform a gas analysis using the A/C service station (only necessary when the refrigerant is to be extracted or the pressure in the refrigerant circuit is to be checked). Refer to REFRIGERANT GAS ANALYSIS, PERFORMING .
Connect the gas analyzer or the A/C service station according to the Owner's Manual and turn on. Refer to A/C SERVICE STATION ON REFRIGERANT CIRCUIT, CONNECTING , the Gas Analyzer Owner's Manual and/or the A/C service station Owner's Manual.
A specific refrigerant circuit pressure is necessary (for example 2.5 bar (36.25 psi) at an ambient temperature of 20 °C (68 °F)) for performing the gas analysis. If there is only so little refrigerant in the circuit, so that not enough pressure is built (for example less than 30 g (1.05 oz) refrigerant which only builds a pressure of approximately 1 bar (14.5 psi)) depending on the version of the A/C Service Station it may be the case that a gas analysis can no longer be performed. Without a gas analysis no refrigerant may be removed from the A/C Service Station. If this is the case pay attention to the instructions in the Owner's Manual from the A/C Service Station. It is described what the quantity that is removed from the refrigerant circuit.
If it is determined by the gas analysis that the refrigerant in the circuit meets the specifications.
-- Install the hand wheel for the high pressure side quick-release coupling connection just far enough into the until the valve is securely opened inside the service connection (pay attention to the pressure gauge, do not put too much pressure on the valve).
-- Perform the specified procedures on the refrigerant circuit using the A/C service station.
If it is determined by the gas analysis that the refrigerant R1234yf is contaminated, extract the refrigerant from the refrigerant circuit and return it to the gas supplier to be processed or disposed of. Refer to CONTAMINATED REFRIGERANT, FILLING IN RECYCLING CONTAINER FOR ANALYSIS, PROCESSING, OR DISPOSAL , RETURN OF CONTAMINATED REFRIGERANT R1234YF FOR ANALYSIS, PREPARATION OR DISPOSAL and A/C TECHNOLOGY BASIC PRINCIPLES .
If there is not the possibility to move the contaminated refrigerant immediately from the vehicle refrigerant circuit in a recycling bottle. Remove (close) the hand wheel from the low pressure side quick-release coupling connection switch off the A/C service station (and if necessary disconnect the power supply). Then disconnect the low pressure side quick-release coupling adapter from the vehicle. Then disconnect the low pressure side quick-release coupling connection for example for a workshop extraction system suction hose from the filler hose to the A/C service station and let the contaminated refrigerant flow out of the filler hose in the workshop extraction system suction hose. To make the A/C service station ready to use again, re-connect the low pressure side quick-release coupling adapter on the filler hose to the A/C service station and evacuate using the A/C service station according to the corresponding Owner's Manual. Refer to the A/C service station Owner's Manual.
-- Perform the specified procedures using the A/C service station.
- Refer to REFRIGERANT GAS ANALYSIS, PERFORMING
- Refer to REFRIGERANT CIRCUIT, DISCHARGING .
- Refer to REFRIGERANT CIRCUIT, EVACUATING .
- Refer to REFRIGERANT CIRCUIT, CHARGING .
- Refer to A/C SERVICE STATION, SWITCHING OFF AND DISCONNECTING FROM REFRIGERANT CIRCUIT
- Refer to REFRIGERANT, FILLING IN RESERVOIR .
- Refer to A/C SERVICE STATION, DISCHARGING .
- Refer to PRESSURES, CHECKING