Electrolux T5190LE, Service Manual

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Service Manual
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6 Condenser
7 Compressor
8 Solenoid valve
9 Coil
10 Valve
11 Drying filter
12 Heat exchanger
13 Capacitor
14 Capacitor
9.2 Function
The heat pump is a closed system in which refrigerant (R134a) is alternately evaporated and condensed in order to
absorb heat from the machines warm moist air and restore the heat to the air, then the water vapor in the air is
condensed.
The refrigerant passes through the compressor as a gas. The compressor raises the gas pressure from around 1-4,5
bar to around 15-26 bar. The increase in pressure also causes the refrigerant temperature to increase to around 90-
110°C.
The refrigerant then passes through a check valve. The valve closes when the heat pump is shut off so that the refrig-
erant does not run back and collect at the coldest point in the system.
When the refrigerant passes through the condenser, it is condensed to a liquid as it is cooled by the cooled air pass-
ing through the condenser, at the same time transferring heat to the air. The air temperature is increased from around
25°C to around 70°C. After condensed to liquid the refrigerant goes to “subcooler” in a brazed plate exchangers.
The refrigerant then passes through a drying filter which traps any pollution and moisture.
The expansion valve is controlled by the temperature in the evaporator. The higher the temperature, the more the
valve opens. As the refrigerant passes through the expension valve, the pressure is reduced from around 15-26 bar
to around 1-4,5 bar. The reduction in pressure also causes the refrigerant temperature to fall. The evaporator in the
system must be retained to ensure a quicker, easier starting cycle.
The refrigerant turns from a liquid to a gas in the evaporator and absorbs the heat from the dryer's warm air passing
through the evaporator.
The “accumulator tank” on the compressor ensures that the refrigerant has gasified, to prevent the compressor being
damaged by fluid hammer.
9.3 Drawing
fig.W00640