3
5 - PRO-DIALOG PLUS CONTROL OPERATION ................................................................................................................. 27
5.1 - Start/stop control ................................................................................................................................................................ 27
5.2 - Heating/cooling selection ................................................................................................................................................... 27
5.3 - Evaporator water pump control .......................................................................................................................................... 28
5.4 - Condenser water pump control ........................................................................................................................................... 28
5.5 - Control interlock contact .................................................................................................................................................... 28
5.6 - Evaporator heater control ................................................................................................................................................... 28
5.7 - Control point ...................................................................................................................................................................... 28
5.7.1 - Active setpoint ........................................................................................................................................................... 28
5.7.2 - Reset ........................................................................................................................................................................... 28
5.8 - Demand limit ...................................................................................................................................................................... 29
5.9 - Capacity control ................................................................................................................................................................ 29
5.10 - Determining the lead circuit ............................................................................................................................................ 29
5.11 - Circuit loading sequence .................................................................................................................................................. 29
5.12 - Slave compressor start-up sequence ................................................................................................................................ 30
5.13 - Controlling the EXV ........................................................................................................................................................ 30
5.14 - Head pressure control on air-cooled units ....................................................................................................................... 30
5.15 - Head pressure control on water-cooled units ................................................................................................................... 30
5.16 - Active setpoint selection .................................................................................................................................................. 30
5.17 - High pressure load shedding function .............................................................................................................................. 31
5.18 - Pumping down .................................................................................................................................................................. 31
5.19 - Master/slave assembly ..................................................................................................................................................... 31
5.20 - Controlling Pro-Dialog Plus units with a System Manager ............................................................................................. 31
5.21 - Optional heat reclaim module .......................................................................................................................................... 32
6 - DIAGNOSTICS - TROUBLESHOOTING ............................................................................................................................ 32
6.1 - General ............................................................................................................................................................................... 32
6.2 - Displaying alarms ............................................................................................................................................................... 32
6.3 - Resetting alarms ................................................................................................................................................................. 32
6.4 - Alarm codes ........................................................................................................................................................................ 33
