TATA PUNCH-SERVICE MANUAL

HVAC (ETC) 30 LEAK DETECTION Visual Detection: Look out for oil leaking from joints, as compressor oil is mixed with refrigerant it also circulates along with it, hence it might also leak at the joints. If leakage is found rectify, if not proceed with any of the test mentioned below to confirm leak- age. Ultra fluorescent Leak Detector: The compressor oil used is pre-mixed with a fluorescent dye. Using a specially designed UV lamp inspect the components. If there is a leakage the colored dye glows bright. This test can pin point small leakages. Electronic Leak Detector: This test is done using an electronic leak detector 1. Place the vehicle in a well ventilated area, free from wind, as leakage can be dissipated without detection in a windy area. 2. Follow the instructions issued by the manufactur- er of the particular leak detector being used. 3. Commence searching for leaks by passing the detector probe around all joints and components. NOTE Refrigerant gas is heavier than air. 4. Insert the probe into an air outlet of the evapora- tor or into the evaporator drain tube. 5. Switch the air conditioning blower on and off at intervals of ten seconds. Any leaking refrigerant will be gathered in by the blower and detected. 6. Insert the probe between the magnetic clutch and compressor to check the shaft seal for leaks. 7. Check all service valve connections. 8. Check the condenser for leaks at the pipe unions. 9. If any leaks are found, the system must be dis- charged before rectification. 10.Rectify any leaks and recheck for leaks during evacuation prior to charging. Using Soap Solution/ Leak detector spray: A leak detector spray or soap solution can be used to detect the leak by spraying it at the joints. If there is a leak bubbles are formed. B. REGULAR MAINTENANCE a) REFRIGERANT RECOVERY, RECYCLING AND RECHARGING WARNING Air conditioning system is charged with a high pres- sure, potentially toxic refrigerant. Repairs or servicing must only be carried out by an operator familiar with both the vehicle system and the charg- ing and testing equipment. All operations must be carried out in a well- ventilat- ed area away from open flame and heat sources. Always wear safety goggles and gloves when open- ing refrigerant connections. Wear eye and hand safety protection. Open connections slowly and care- fully when liquid or pressure is present, allowing it to bleed off slowly. CAUTION Overcharging air conditioning system will cause ex- cessive head pressure. An air conditioning portable Refrigerant Recovery Recycling Recharging Station or Refrigerant Recov- ery Unit (RRU) for use with R134a refrigerant incorporates all the features necessary to recover refrigerant R134a from the air conditioning system, to filter and remove moisture, to evacuate and re- charge with the reclaimed refrigerant. The unit can also be used for performance testing and air condi- tioning system analysis. The operator must adhere to the equipment manu- facturers’ instructions. The RRU set up is as shown in following figure