Zanotti un0 010, Workshop Manual

Page: 48 / 248

Contents of section
3 Cooling Circuit ........................................................................................................................................................................................................... 39
3.1 Cooling Diagrams ........................................................................................................................................................................................... 39
Monoblock .................................................................................................................................................................................................. 39
Split ................................................................................................................................................................................................................ 39
3.2 Operations ........................................................................................................................................................................................................ 40
Pump Down Stop ...................................................................................................................................................................................... 40
Recover Refrigerant .................................................................................................................................................................................. 42
Vacuum Operation ................................................................................................................................................................................... 42
Refrigerant Charge ................................................................................................................................................................................... 43
Refrigerant leaks ........................................................................................................................................................................................ 44
Leakage Test ..................................................................................................................................................................................... 44
Leak Search Procedure ................................................................................................................................................................. 45
Basic steps in brazing ............................................................................................................................................................................... 46
3.3 Valves ................................................................................................................................................................................................................. 47
Shut-off Valves ........................................................................................................................................................................................... 47
Opening Valve ................................................................................................................................................................................. 47
Opening Service Port (pos. 2) ..................................................................................................................................................... 47
Valve and Gasket Replacement ................................................................................................................................................. 48
Service ports ............................................................................................................................................................................................... 48
Valve Test .......................................................................................................................................................................................... 50
Valve Replacement ........................................................................................................................................................................ 50
SAE Pressure Switch Replacement ........................................................................................................................................... 51
Solenoid Valves .......................................................................................................................................................................................... 51
Solenoid Coil and Valve Tests ..................................................................................................................................................... 51
Valve Disassemble .......................................................................................................................................................................... 52
YS 3-Way Replacement ................................................................................................................................................................. 52
YK Capacity Control Valve Replacement ................................................................................................................................ 53
Non return Check Valves ........................................................................................................................................................................ 54
Check Valve Test ............................................................................................................................................................................. 54
Check Valve Replacement ........................................................................................................................................................... 55
3.4 Filter Drier and Sight Glass .......................................................................................................................................................................... 55
Filter Drier Replacement ......................................................................................................................................................................... 56
3.5 Orifice and Expansion Valve ....................................................................................................................................................................... 57
Expansion Valve Regulation .................................................................................................................................................................. 57
Orifice Replacement ................................................................................................................................................................................. 58
Expansion Valve Replacement ............................................................................................................................................................. 60
3.6 CPR Crankcase Pressure Regulation Valve ............................................................................................................................................. 62
CPR Regulating Procedure ..................................................................................................................................................................... 62