Toyota Prius 2010 Repair Manual page 33

(b) The ejector includes nozzle, mixing and diffuser portions.
(c) A high temperature and pressure liquid refrigerant flowing from the condenser is introduced into the mixing
section through the nozzle at high speeds as the nozzle is inwardly tapered. This decreases the refrigerant
pressure in the vicinity of the nozzle, introducing low temperature and pressure gaseous refrigerant into the
nozzle from the evaporator. Thus, both refrigerants are mixed in the mixing section and are introduced into the
diffuser section.
(d) As the diffuser section is outwardly flared, the refrigerant flow rate in the diffuser decreases and the
refrigerant pressure rises.
(e) Through these operations, the refrigerant pressure in the evaporator on the downwind side can be constantly
kept lower than that on the upwind side, creating the lower temperature conditions. Therefore, air cooled by the
evaporator on the upwind side can be further cooled by that on the downwind side, thus improving the
efficiency of the evaporator.
7. MICRO DUST AND POLLEN FILTER MODE CONTROL
(a) When the micro dust and pollen filter mode switch is pressed, the micro dust and pollen filter mode control
is activated.
(b) Then, the air vent is switched to the FACE mode and recirculated pollen-free air flows in the area around the
upper part of the bodies of the driver and front passenger.
(c) When the micro dust and pollen filter mode switch signal is input to the A/C amplifier, the A/C amplifier
controls the compressor with motor assembly, air inlet control servo motor, air outlet control servo motor and
blower motor as shown in the timing chart below.
(d) This control usually operates for approximately 3 minutes. However, when the outside temperature is low
(5°C (41°F) maximum), it will operate for approximately 1 minute.
(e) After this control stops operating, the A/C amplifier controls the air conditioning system using AUTO mode.
2010 Toyota Prius Repair Manual