Determine right pressure setpoint 3

[saeedplc]

Hi dear experts

Could you please let me know how to get right diffrential pressure value in secondary loop of chilled water system supplying different terminal units?
A diffrential pressure transmitter has been installed in farthest unit and all units are equipped with pressure independent valves. a Vfd is controlling the secondary pump speed according to the pressure value.
i need to determine right pressure setpoint.
Your reply will be highly appreciated.

 

[saeedplc]

Thank you so much for the reply.

Honestly, i am confused about the best place of the DPT
Some guys tell it should be on the most remote terminal unit, others says it should be 2/3 of the main line and even across the pump.
Some guys believe it depends on the design.

**all these statemens are based on constant static pressure setpoint not pressure reset method.**

 

[saeedplc]

Dear @EnergyProfessional could you please upload pdf file of the boiler photo or higher quality of it.thanks lot.

 

[moideen]

the attached pdf copy is related to pump control. thanks

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