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HVAC
17
D. CONDENSER AND RECEIVER DRIER
CONDENSER
CONDENSER
The condenser is a heat exchanger used to cool the
hot vapourised refrigerant. Also the refrigerant
changes its state from vapour to liquid. The
condenser is placed in front of the radiator behind
the radiator is the fan used to draw in ambient air.
CONDENSER SEALING DUCTS
Sealings are used to guide the flow of the air to the
condenser and also to avoid the hot air recirculating
from the engine compartment to the condenser.
RECEIVER DRIER (R.D)
The receiver drier is integrated into the Condenser
and has three main functions.
i) It absorbs the moisture in the refrigerant.
ii) It allows only liquid (
high pressure liquid)
to pass
through to the TXV.
iii) It keeps a reserve of refrigerant to accommodate
fluctuating refrigerant requirements.
E.
ON VEHICLE INSPECTION (WITHOUT DIS-
MANTLING HVAC UNIT)
Alternatively following test can be conducted without
dismantling the HVAC unit:
1. Switch OFF the HVAC unit and allow the HVAC
unit to come to ambient temperature.
2. Open the glow box & lowering Glove box lid.
3. Disconnect the Pigtail connection.s
4. Measure the resistance it should match to the
ambient temperature. Refer graph in Inspection
topic.
As given in the graph above
(~ 5 Ohms or less for
ambient temperature of 25ºC and above)