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[EnergyPlus_Support] Pump error

Dear all

I set up a circling pump between a supply water mixer and splitter. 
I 
run a sizing simulation. Then the warning shows up as follow: 
** Warning ** Check input. Calculated Pump Efficiency=0.00E+000%
which 
is less than 50%, for pump=CW CIRC PUMP
   **   ~~~   ** Calculated Pump_Efficiency % =Total_Efficiency % 
[0.0E+000] / Motor_Efficiency % [90.0]
   **   ~~~   ** Total_Efficiency % =(Rated_Volume_Flow_Rate
[0.0E+000] 
* Rated_Pump_Head [179352.0] / Rated_Power_Use [300000.0]) * 100.
   ** Warning ** Check input. Pump nominal volumetric flow rate is
set 
or calculated = 0, for pump=CW CIRC PUMP
How can I fix it ?
Thank you in advance

charlie






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