2-52 888-2629-200 10/6/10WARNING: Disconnect primary power prior to servicing.Section 2 Installation Maxiva ULX COFDM SeriesNOTE:If the pump is unable to deliver the required flow rate, check for correct wiring ofthe 3 AC phases. Incorrect wiring of the 3-phase sequence would cause thepumps to operate but with much degraded performance. If this is the case, see"2.11.1.1 Starting Pumps & Checking Pump Rotation" on page 2-38.STEP 3 Verify that the flow switch operates correctly by decreasing theamount of flow through the cabinet. The flow warning should activateand the system should switch to the other pump if set to Automatic. Ifset to Manual the pump will shut down.STEP 4 Go back to the nominal flow rate recommended for the cabinet. Thewarning should go away.2.14.1.1 Heat Exchanger Fan Turn ON TemperaturesFan operation is controlled by a PID controller in the cooling system control panel.Review the temperature controller confguration and instruction table in themanufacturers cooling system manual that ships with each unit. The controllerautomatically turns fans on and off according to temperature sensed in the heatexchanger return line. The fans can also be turned off with isolator switches on the heatexchanger to allow for maintenance.Factory settings are Fan 1 set point(set value SV) at 32o C with a 5o degree hysteresiswindow (O1HY). This means Fan 1 turns ON at 34.5o C and shuts off at 29.5o C. Fan 2offset (deviation A2DV) will be set at 5.5o (37.5 o C. center temperature) with a 5degree hysteresis window (A2HY). This means Fan 2 turns ON at 40o C and shuts off at35o C.STEP 1 Use the electronic controller in the pump control panel to verify thefactory settings for Fans 1 and 2. Adjust if necessary.2.14.1.2 Verify Pump Switching (Dual Pumps Only)STEP 1 Go to the cooling control panel and select REMOTE on the SystemControl switch.STEP 2 From the HOME screen press SYSTEM on the GUI to view coolingsystem control and performance data. This screen is shown in Figure3-14 on page 3-19.STEP 3 Under Pump Control Select MANUAL. The Manual button should beyellow when selected.
