Manual code 75803707A.0708
Page 4 of 64
7.1.8 COOLING CAPACITY CONTROL WITH HOT GAS INJECTION VALVE AND
ELECTRONIC EXPANSION VALVE 38
7.2 SUPPLY AIR TEMPERATURE CONTROL (LIMIT) 39
7.2.1 µAC MICROPROCESSOR 39
7.2.2 pCO MICROPROCESSOR CONTROL 39
7.3 HUMIDITY CONTROL 40
7.3.1 DIRECT EXPANSION AIR CONDITIONERS 40
7.3.2 CHILLED WATER AIR CONDITIONER 41
7.3.3 SIMULTANEOUS HUMIDIFICATION AND COOLING 41
7.3.4 DEHUMIDIFICATION LOCK 41
8 VENTILATION 42
8.1 FANS WITH 5-SPEED AUTO-TRANSFORMER 42
8.2 FANS WITH 0-10 V MODULATING CONTROL (pCO) 42
8.2.1 CONSTANT FLOW RATE CONTROL 42
8.2.2 CONTROL WITH CONSTANT PRESSURE IN THE UNDERFLOOR OR SUPPLY
DUCT 42
8.2.3 CONTROL OF AIR FLOW RATE ACCORDING TO COOLING CAPACITY 43
9 FREE COOLING AND TWIN SOURCES (pCO) 44
9.1 WATER FREE COOLING 44
9.1.1 FREE COOLING CONTROL 44
9.2 DIRECT EXPANSION TWIN SOURCES 45
9.2.1 DIRECT EXPANSION - WATER TWIN SOURCES(OCA…?/TS - UCA…/TS) 45
9.2.2 WATER - DIRECT EXPANSION TWIN SOURCES(OCA…/TS - UCA…/TS) 45
9.3 WATER CHILLED TWIN SOURCES 46
9.3.1 WATER - WATER TWIN SOURCES(OCU…/TS - UCU…/TS) 46
10 LOCAL NETWORK 47
10.1 MASTER - SLAVE LOCAL NETWORK 47
10.2 CASCADE LOCAL NETWORK(pCO) 47
10.3 CRITICAL SITUATIONS 47
10.4 EMERGENCY OPERATION 47
11 ROUTINE AND MAJOR MAINTENANCE 48
11.1 PROGRAMMED MAINTENANCE CHART 48
11.2 MAINTENANCE OF THE FANS 50
11.3 REFRIGERATION CIRCUIT CHECKS 50
11.4 MAINTENANCE OF THE ELECTRICAL BATTERY 50
11.5 MAINTENANCE OF THE ELECTRICAL PANEL 50
11.6 MAINTENANCE OF THE AIR FILTERS 50
11.7 MAINTENANCE OF CEA AIR-COOLED CONDENSERS 51
12 FAULT DIAGNOSIS 52
12.1 DIRECT EXPANSION AIR CONDITIONERS - REFRIGERATION CIRCUIT PROBLEMS 53
12.2 CHILLED WATER AIR CONDITIONER - WATER CIRCUIT PROBLEMS 55
12.3 HEATING SECTION PROBLEMS 56
12.4 DEHUMIDIFICATION PROBLEMS 57
12.5 VENTILATION PROBLEMS 59
13 GLOSSARY 60
14 NOTES 61
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