38.1 SUPPLY FAN DURING DEFROST 112
38.2 HOT START FUNCTION 113
39. FUNCTION OF SUPPLY FAN MAINTENANCE REQUEST 113
40. CONDENSER WATER PUMP WORKING 113
40.1 ONLY ONE RELAY CONFIGURED AS CONDENSER WATER PUMP 113
41. CONDENSER WATER PUMP ROTATION 114
41.1 2 RELAYS CONFIGURED AS CONDENSER WATER PUMP 114
41.2 ROTATION OF THE CONDENSER WATER PUMPS FROM DIGITAL INPUT 114
42. CONDENSER PUMP ANTI-FREEZE MANAGEMENT 114
43. WATER PUMP MAINTENANCE REQUEST FUNCTION 115
44. SWITCH-ON/OFF WORKING WITH PUMP-DOWN 115
44.1 PUMP-DOWN FUNCTION WITH CIRCUIT LOW PRESSURE PRESSURE SWITCH 116
44.2 PUMP-DOWN FUNCTION WITH DEDICATED PRESSURE SWITCH 116
44.3 PUMP-DOWN FUNCTION FROM ANALOGUE INPUT 116
44.4 PUMP-DOWN FUNCTION IN COOLING MODE ONLY (Configuration possible only for reversible
units with the enabling of the working of the compressors in heating mode). 116
44.5 LOW PRESSURE ALARM DURING THE PUMP-DOWN 116
44.6 WORKING EXAMPLES: 117
44.6.1 Pump-down active only in switch-off based on LP pressure switch.........................................117
44.6.2 Pump-down active in switch-off and re-start, based on dedicated pressure switch. Pump-down
pressure switch intervention threshold higher than the intervention threshold of the LP pressure switch.117
44.6.3 Pump-down active in switch-off and re-start, based on dedicated pressure switch. Pump-down
pressure switch intervention threshold lower than the intervention threshold of the LP pressure switch.117
44.6.4 Pump-down active in shut-down and in re-start, based on the analogue input relative to the
evaporation pressure..............................................................................................................................118
44.7 TIMED PUMP DOWN FUNCTION 118
44.8 PUMP DOWN ALARM IN START-UP AND STOPPING 118
45. CIRCUITS UNLOADING 119
45.1 UNLOADING FROM CONDENSATION HIGH TEMPERATURE PROBE 119
45.2 UNLOADING FROM CONDENSATION HIGH TEMPERATURE TRANSDUCER 120
45.3 UNLOADING BY LOW PRESSURE TRANSDUCER 121
45.4 UNLOADING DUE TO EVAPORATOR WATER INLET HIGH TEMPERATURE 121
45.5 EVAPORATOR WATER LOW TEMPERATURE UNLOADING (NO AIR-AIR) 121
45.6 WORKING IN UNLOADING MODE NOTES 122
46. CONDENSATION FANS REGULATOR 122
46.1 IF THE PWM/ 0÷10V SIGNAL TRIAC OUTPUT IS USED 123
46.2 IF THE STEP RELAY OUTPUTS ARE USED 123
46.3 UNIQUE OR SEPARATE CONDENSATION 124
46.4 PROPORTIONAL FAN REGULATOR GRAPHICS 125
46.5 CONDENSATION FAN REGULATOR ON / OFF IN COOLING MODE GRAPHICS 125
46.6 CONDENSATION FAN REGULATOR ON / OFF IN HEATING MODE GRAPHICS 125
47. ANTI-FREEZE/SUPPORT HEATERS REGULATOR 126
47.1 HEATER OUTPUT WORKING IN COOLING OR HEATING MODE 126
47.2 TEMPERATURE CONTROL IN COOLING MODE 126
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