flow switch for chillers

[shibly]

dear friends, please let me know what type of flow switches / make i shall use for my 2 trane chillers with 180tr capacity each and where i should install it pls guide me.

[mustardman]

Just use a Mc Connel and miller standard 1" mpt with paddles trimmed if necessary and install it on the outlet of your evap and your condenser

[shibly]

thank you very much for ur guidance, i have one more question pls let me know the concept of primary pump and secondary pump. primary pump is controlling from where to where. whether primary pump controlling flow from ahu coil to chiller inlet or just from discharge of primary pump to suction of secondary pump.
and secondary pump controlling from where to where.
pls guide me.
thanks.