The temperature drop of the primary loop may be less than or significantly greater than 20 degrees F. MYTH 3: The primary circulator must be selected so the primary loop will operate with a 20 degrees F temperature drop at design load conditions.The total of all secondary circuit flow rates may be several times the flow rate in the primary loop. MYTH 2: The primary loop circulator must produce a flow rate equal to or greater than the total flow rate of all secondary circuits.Its size is determined by the rate of heat production of the system's heat source, as well as the selected temperature drop of the primary loop at design load conditions. FACT: Although the primary pump may be the largest circulator in the system, it may also be the smallest.MYTH 1: The primary loop circulator must be the largest circulator in the system.
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