Primary And Secondary Hot Water Pump

The primary pump ran all the time and the secondary pumps could be cycled on and off to create independent zones.

Primary and secondary hot water pump. In fact there are five common approaches and all but one includes some variation of our topic of late primary secondary pumping. By chris edmondson theres more than one way to pump a chiller or boiler system. We call the system ive been describing one pipe primary secondary pumping the primary circulator moves the boiler water through the primary circuit. The flow through the loop is slow even with a pump but any amount of movement ensures there is always hot water at each fixture.

The primary water flows into this to provide heated or chilled water to the secondary circuits. This is the basis for another common hydronic rule. This can be avoided simply by shutting off the secondary pumps whenever primary flow is off. When the flow of cooler water returns from the secondary circuit the hot primary water which jumped the gap between the two tees mixes with the return water.

The primary and secondary circuits are connected via a pipe known as the low loss header it is also sometimes referred to as the decoupler or common header. All the action is in the primary loop. In a home where the hot water lines drop below the water heater a recirculating pump is connected into the loop here as well to circulate the water through the secondary pipes. Variable primary pumping contemporary system.

Secondary circulation is a method of circulating hot water close to all outlets to ensure hot water is available as whenever the tap is turned on. When two piping circuits are interconnected flow in one will not cause the flow. If the primary pumps are off and chiller isolation valves are closed while the sec ondary pumps are on the secondary pumps will be deadheaded. Check valve is when the primary pumps and chillers are piped in the headered arrangement in figure 1.