1 / 30

HVACR216 - Hydronics

HVACR216 - Hydronics. Circulator pumps. Circulator Pumps. The circulator pump is the heart of the Hydronic system Although smaller and less expensive then the heat source, the pump is just as vital to a heating systems performance. Circulator Pumps.

dacey-buck
Download Presentation

HVACR216 - Hydronics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. HVACR216 - Hydronics Circulator pumps

  2. Circulator Pumps • The circulator pump is the heart of the Hydronic system • Although smaller and less expensive then the heat source, the pump is just as vital to a heating systems performance.

  3. Circulator Pumps • Pumps come in a wide variety of designs, sizes and performance ranges. • In a closed loop, fluid filled hydronic system, the function of the pump is to circulate the fluid throughout the piping. • In a closed loop system the pump is made out of cast iron. (heating circuits) • In an open loop system the pump material is bronze. (potable water circuits)

  4. Circulator Pumps Taco 006 bronze pump Taco 007 cast iron pump

  5. Circulator Pumps • The type of pump used in hydronic systems is known as a centrifugal pump. • Most smaller circulator pumps utilize a permanent split capacitor (PSC) motor attached to an impeller. • As the impeller rotates, it adds mechanical energy (Head) to the fluid.

  6. Circulator Pumps • As the impeller rotates, fluid within the center opening (the eye) of the impeller is rapidly accelerated through the passageways formed by the impeller vanes • As the fluid exits the impeller, the mechanical energy converts to a pressure increase.

  7. Circulator Pumps • Most impellers are constructed of stainless steel, bronze or synthetic materials to prevent corrosion.

  8. Circulator Pumps • Impeller

  9. Circulator Pumps • A circulator pump doesincrease pressure at its outlet. • A circulator pump does not create a suction at its inlet. • All circulators require the entering water to be pushed into the inlet port of the pump by the system pressure upstream.

  10. Circulator Pumps • The chamber surrounding the impeller is called the Volute. • Circulator pumps can be built with different shaped volutes. • The volutes shape determines how the pump will be installed on the system piping.

  11. Circulator Pumps • VoluteMotor

  12. Circulator Pumps • Inline type circulators have their inlet and discharge ports along a common centerline. • The inline type circulator is by far the most common type used in residential and light commercial hydronic systems.

  13. Circulator Pumps • Inline Circulator

  14. Circulator Pumps • By modifying the shape of the volute, a design called an end suction pump is created. • End suction pumps create a 90 degree turn in the system piping. • End suction pumps are usually floor mounted and are more common in larger hydronic systems.

  15. Circulator Pumps • End suction pump

  16. Circulator Pumps • End suction volute

  17. Circulator Pumps • The modern, smaller circulator pump is known as a wet-rotor circulator. • The rotor, shaft and impeller are combined in a single assembly and housed in a chamber filled with the system fluid. • The motor is cooled and lubricated by the systems fluid.

  18. Circulator Pumps • Wet rotor circulator

  19. Circulator Pumps • The wet rotor circulator does not require oiling. • There is no leakage from worn seals. • They are small in size which makes it easy to locate and support. • They are relatively inexpensive.

  20. Circulator Pumps • Another common pump design is the three piece circulator. • It consists of pump body (Volute), coupling assembly and a motor assembly.

  21. Circulator Pumps • Three piece circulator Pump body Coupling assembly Motor

  22. Circulator Pumps • Unlike wet rotor circulators, the motor of a three piece circulator is totally separate from the wetted portion. • This allows the motor or coupling to be serviced or replaced without the need to open the system piping.

  23. Circulator Pumps • Most three piece circulators utilize a split phase motor. • The design of the coupling varies among manufacturer's. • A common design employs a spring assembly that absorbs vibration or high torque between the two shafts as the motor starts.

  24. Circulator Pumps • Some of the disadvantages of using the three piece circulator are: • They are heavy and large • Must be oiled periodically • Noisier • Potential maintenance of seals and coupling • Motors are not as energy efficient

  25. Circulator Pumps • Overview of circulators • All circulators have an arrow showing the direction of flow stamped on the Volute. • Most circulators should be installed with the shafts mounted in the horizontal position.

  26. Circulator Pumps • The weight of the circulator should not be supported by the system piping unless it is relatively light and the piping itself is well supported. • All circulators should be installed with some sort of isolation valves to permit servicing.

  27. Circulator Pumps • Always install the circulator so that its inlet is close to the connection point of the systems expansion tank. • Always install circulators to pump away from the point of no pressure change. • The point of no pressure change is the area near the expansion tank

  28. Circulator Pumps • If mounting several circulators on one common header, support the added weight using rod, clamps, chain, etc. • If utilizing multiple circulators, you must also install check valves in each circuit.

  29. Circulator Pumps • Circulators are available in multiple speeds. • Some circulators are available with internal flow checks. • Most currently produced wet rotor circulators are rated for continuous operation at fluid temperatures up to 230 degrees Fahrenheit.

  30. Circulator Pumps • The 3 piece type circulator typically has maintenance issues that need to be addressed. • The seals will need to be replaced if leakage occurs. • The bearings needs to be oiled annually.

More Related