How to set the schedule on/off for hot water pump in OpenStudio?

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Due to my study of solar based vapor absorption chiller, I have completed the schedule for pump on/off control (in terms of chilled water and condenser regarding thermostat of FCU). However, the hot water pump still run all periods in the year (always activate). I would like to set the on/off for hot water pump as my need. Hence, please suggest me if it possible that I use the schedule manager (valve on/off) or others which is more suitable function?

please guide me.