Volkswagen Golf Service & Repair Manual: Electrical air conditioner compressor for high-voltage system

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General information on refrigerant circuit / Refrigerant circuit components / Electrical air conditioner compressor for high-voltage system

WARNING

High voltage on high-voltage system of hybrid vehicle! Health risks for persons wearing medical devices!

Following procedure also requires work on high-voltage system. All work on vehicles with a high-voltage system may only be done by trained electricians. Work must be advised by a high-voltage technician.

Observe the general warning instructions for work on the high-voltage system ⇒ Electric drive, Repair group 93; General warning instructions for work on the high-voltage system.

Now, ensure there is no voltage in high-voltage system ⇒ Electric drive, Repair group 93; Ensuring there is no voltage in high-voltage system.

WARNING

The electrical air conditioner compressor requires a different refrigerant oil!

For capacities, see workshop manual for specific vehicle.

Electrical air conditioner compressor

WARNING

Danger of short circuit

The air conditioner compressor operates with 288 volts and at a speed range of 800 to 8,600 rpm.

Do not touch air conditioner compressor when drive units are starting. Danger of short circuit!

The air conditioner compressor draws refrigerant gas from the evaporator, compresses it and sends it to the condenser.

Note

The air conditioner compressor contains refrigerant oil, which is miscible with R134a refrigerant at all temperatures.

The maker's nameplate states the refrigerant for which the air conditioner compressor is suitable. The flow rate is controlled via the engine speed.

The engine should be started only when the refrigerant circuit has been fully assembled → Chapter.

The air conditioner compressor has an internal oil circuit to ensure that the air conditioner compressor is not damaged when the refrigerant circuit is empty. This means that about 40 to 50 cm³ refrigerant oil remain in the air conditioner compressor.

The air conditioner has a pressure relief valve.

Electrical air conditioner compressor for high-voltage system

Air conditioner compressor without magnetic clutch, with elastic drive coupling

The air conditioner compressor is driven directly by the power steering vane pump. There is an overload protection on the drive shaft of the ai ...

Condenser

The condenser transfers heat from the compressed refrigerant gas to the surrounding air. This allows the refrigerant gas to condense into liquid ...

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