TATA PUNCH-SERVICE MANUAL

HVAC (ETC) CONTENTS 1 HVAC SYSTEM LAYOUT...........................................................................................1 2 TECHNICAL SPECIFICATIONS.................................................................................2 3 TIGHTENING TORQUES............................................................................................6 4 PRECAUTIONS ..........................................................................................................8 5 HVAC SYSTEM LAYOUT AND WORKING ...............................................................9 6 ELECTRONIC TEMPERATURE CONTROLLER (ETC)...........................................11 7 WORKING / FUNCTION OF ETC .............................................................................12 A PROCEDURE OF AUTO LEARNING.......................................................................... 12 B FAILURE INDICATION DURING NORMAL MODE ..................................................... 12 C MANUAL CALIBRATION OF DC MOTORS ................................................................ 12 D ENTER DIAGNOSTICS MODE ................................................................................... 12 E BLINK CODES DISPLAY(FAULT CODE).................................................................... 13 F CLEAR FAULT MEMORY ........................................................................................... 13 G EXIT FROM DIAGNOSTIC MODE .............................................................................. 13 8 CONNECTOR DETAILS ...........................................................................................14 9 HVAC UNIT COMPONENTS ....................................................................................15 A BLOWER MOTOR ...................................................................................................... 15 B EVAPORATOR COIL AND TXV (THERMAL EXPANSION VALVE)............................ 15 C TXV (THERMOSTATIC EXPANSION VALVE) ............................................................ 15 D HEATER COIL ............................................................................................................ 16 10 COMPRESSOR ........................................................................................................16 11 CONDENSOR ...........................................................................................................18 12 RECEIVER DRIER (R.D) ..........................................................................................17