Blue Box SIGMA 2002 - Page 5

Blue Box
6.1.9 Switching off the machine (stand by) 59
6.1.10 Inlet water temperature control 60
6.1.11 Defrosting (only /LC, heat pump units) 60
6.2 STARTING THE UNIT 62
6.3 STOPPING THE UNIT 62
6.3.1 Temporary stop 62
6.3.2 Seasonal stop: 63
6.4 EMERGENCY STOP 63
7. TROUBLESHOOTING 63
8 UNIT WITH pCO
2
MICROPROCESSOR (models from 14.4 to 26.4) 71
8.1 General 71
8.1.1 Display 71
8.1.2 Keypad 71
8.2 OPERATING DESCRIPTION 73
8.2.1 Introduction 73
8.2.2 Unit in stand-by mode 73
8.2.3 Enabling the unit 73
8.2.4 Pumps management 73
8.2.5 Compressor start-up 73
8.2.6 Chiller mode operation 73
8.2.7 Heat pump mode operation 74
8.2.8 Evaporator low temperature chilled water protection 74
8.2.9 Evaporator anti-freeze protection electric heater (optional) 74
8.2.10 Compressor operation 74
8.2.11 Compressor management 75
8.2.12 High and low pressure alarms 75
8.2.13 Changeover from chiller to heat pump and vice versa 75
8.2.14 Desuperheater (Option) 75
8.2.15 Total heat recovery (only SIGMA 2002/DC) 75
8.2.16 Dual set-point (option) 76
8.2.17 Leaving water temperature control (option) 76
8.2.18 Defrost (heat pumps units /LC) 76
8.3 STARTING THE UNIT 78
8.4 STOPPING THE UNIT 78
8.4.1 Temporary stop: 78
8.4.2 Seasonal stop: 78
8.5 EMERGENCY STOP 78
9 TROUBLESHOOTING 79
10 CHECKS DURING OPERATION 87
10.1 Checking the refrigerant charge 87
11. CALIBRATION OF CONTROL EQUIPMENT 88
11.1 INTRODUCTION 88
TABLE 5 - CALIBRATION OF CONTROL EQUIPMENT 88
TABLE 6 - CALIBRATION OF SAFETY DEVICES 88
12. MAINTENANCE AND PERIODIC CHECKS 89
12.1 WARNINGS 89
12.2 INTRODUCTION 89
12.3 REPAIRING THE REFRIGERANT CIRCUIT 90
12.3.1 Leak test 90
12.3.2 High vacuum and dehydration of the refrigerant circuit 90
12.3.3 Refrigerant charge 91