The alarm screen indicates both outputs failed to control the Supply Temperature. At this point, the service personnel will need to correct the problem and then select the Reset Pump/Fan button to restart the GPC Plus Lead/Lag control sequence.
Although the button and alarm indicators show Lead Pump / Fan indicators, the outputs are not limited to those types of control. You just need to understand that the Lead Pump / Fan controls AHU #1 in this sample and Standby Pump / Fan controls AHU #2.
35
