Description and principle of operation of air conditioning

In the air conditioning system (A/C) an evaporator jet is provided, the control is carried out by a low pressure switch. The refrigerant used is R134a.

Cooler circuit

Pos.	Spare Part No	Name
1	-	Capacitor core
2	-	Air conditioning compressor (A/C)
3	-	suction accumulator
4	-	Blower fan motor
5	-	Evaporator core
6	-	Evaporator jet
7	-	Condenser fan motor
8	-	High pressure side, liquid form and warm state
9	-	Low pressure side, liquid form and cold state
10	-	Low pressure side, gaseous form and cold state
11	-	High pressure side, gaseous form and hot state

A/C compressor (2) driven by the engine. The A/C compressor pumps the gaseous refrigerant from the suction tank (3) and squeezes it. The refrigerant is heated and fed into the condenser core (1) under high pressure.

At this point, heat from the refrigerant is taken in by air driven through the cooling fins. Due to this loss of heat, the refrigerant liquefies and leaves the condenser core.

Evaporator jet (6), which separates the high pressure refrigerant from the low pressure refrigerant, located between the condenser core and the evaporator core (5). This evaporator jet slows down the flow of refrigerant from the A/C compressor, causing pressure to build up in the condenser core.


After passing through the evaporator jet, the liquid refrigerant expands in a circuit towards the evaporator core. In the evaporator core, the liquid refrigerant returns to the gaseous state, and this leads to the release of heat from the air entering the car. The air is therefore cooled and releases the moisture it contains to the evaporator core. The refrigerant stream leaving the evaporator core enters the suction tank and is again pumped by the A/C compressor.

The system is protected by a high pressure switch, which prevents damage due to exposure to excessively high pressure (for example, due to overflow). If the pressure exceeds the maximum allowable level, the high pressure switch switches off the A/C compressor.

The A/C compressor cycles are controlled by a low pressure switch depending on the level of low pressure in the suction accumulator. Low pressure switch turns off the A/C compressor when the pressure drops below the set value (for example, if there is a leak).

Compressor A / C Ford FVS 090 variable performance

Pos.	Spare Part No	Name
1	-	Suction port
2	-	High pressure port
3	-	Thermal relay
4	-	A/C Clutch Connector
5	-	Drive Belt Pulley with A/C Clutch