Service manual

AUX air conditioner service manual
21
a) Evaporator:
Evaporator is also called cooler. It is the apparatus used for direct cooling purpose in the refrigerating
cycle and is usually installed inside the indoor unit. The evaporator applied in the air-conditioner is the
wing coil type with high heat transmission coefficient and compact structure. The liquid refrigerant
flows into the snake copper pipe after the throttle of the capillary tubes. The air around the outside of
the copper pipe is the floating air by force. When the compressor works, the wing coil will absorb the
quantity of heat from the indoor air so as to have the liquid refrigerant gasified and bring away the
quantity of heat for cooling the room temperature. Meanwhile, it can also freeze the surrounding air of
the evaporator until its temperature reaches the dew point to get rid of the moisture and humidity of
the air.
Due to the continuous production for condensing water between the wings of the evaporator, the
distance between the wings is usually required to be enlarged enough (comparing with the one of
condenser) for insuring the air’s free flow. In addition, the hydrophilic aluminum foil is generally
applied for the wing of the evaporator so as to reduce the surface tensile force of the condensing water
and quicken the water flowing speed and consequently accelerate the air flowing speed.
b) Condenser
Condenser liquefies the high temperature and pressure gas refrigerant delivered from the compressor.
The structure of the condenser in the air-conditioner is basically same as the one of evaporator. When
the compressor works, the high temperature and pressure gas refrigerant ejected from the compressor
enters into the copper pipe of the condenser through the air-inlet mouth, and turns into the liquid after
the heat exchange process undertaken by the outside wings. The condenser usually chooses the air as
its cooling medium. However, due to the low heat transmission coefficient of the air, the wings on the
copper pipes are used for enlarging the heat exchange area with the air, and the heat transmission
ability is also enhanced by the blast of the outdoor fan. To the split type air-conditioner, condenser is
assembled and located in the outdoor unit together with the compressor.