Emerson Liebert iCOM Manual De Usuario

4. P68 must have a jumper placed between the top and bottom two pins on the left side and one 

placed between the top and bottom pins on the right side, the two middle pins should be left 

unconnected.

5. Go to Service>Diagnostics Service Menu and find S379. Set this option to Feedback and note that 

S380 will go to Yes and S381 will go to Ongoing. If Feedback is already selected, then go to line 

S380 and manually select Yes. This means that the Liebert iCOM is calibrating the valve using 

the feedback available through the potentiometer. When for S381 says Idle, the process is 

complete.

6. Turn the unit On at the Liebert iCOM.

Special staging may be set to on units with dual chilled water valves. Chilled water valves may be 

staged in Parallel, Cascade or alternate lead operation.
Parallel control allows both chilled water valves to operate at the same time, following the same 

open/close command as the room condition deviates from setpoint. 
Cascade control allows the valves to operate in stages. This means only one circuit will be operated to 

maintain the conditioned space temperature. If the room condition is not held with one circuit in 

operation, the Liebert iCOM will automatically stage a second valve on to maintain room conditions. 

An automatic timer may be used to alternate the lead valve to keep equal component run time.
Alternate operation allows one circuit to work as lead and the second circuit to act as backup. The 

lead valve will rotate based on valve run time, or the user can alternate the lead valve using a 

customer input connection.