WattsBackflow Preventer 009Repair Kit

A timer simply turns the pump on and off at certain times of the day. Think lamp timer! The engineer may want the pump off at night in an office but running during the day. The Bell & Gossett TC-1 timer designed for the NBF pump series is an example of this type of control.

Watts0091 inchBackflow Preventer

Series 009-AUS reduced pressure zone backflow preventer devices are designed to protect potable water supplies in accordance with national plumbing codes and water authority requirements. This series can be used in a variety of installations, including the prevention of health hazard cross-connections in piping systems or for containment at the service line entrance. This series features two in-line, independent check valves, captured springs and replaceable check seats with an intermediate relief valve. Its compact modular design facilitates easy maintenance and assembly access.

Watts009 Backflow Preventer

Domestic hot water recirculation pumps could simply run continuously. This satisfies the requirement to have hot water available at the last fixture. It also satisfies any concern about stagnant flow conditions if the system is properly designed and balanced. Running a pump 24/7 will waste energy. What options are available?

Series 009-AUS reduced pressure zone backflow preventer devices are designed to protect potable water supplies in accordance with national plumbing codes and water authority requirements. This series can be used in a variety of installations, including the prevention of health hazard cross-connections in piping systems or for containment at the service line entrance. This series features two in-line, independent check valves, captured springs and replaceable check seats with an intermediate relief valve. Its compact modular design facilitates easy maintenance and assembly access.

Watts0092 inchBackflow Preventer

For product-specific approval information, please refer to the product’s specification sheet or contact us. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:

Once again, I mention the B&G Ecocirc®-XL Smart ECM Pump. This pump has a built-in temperature sensor which will ramp the pump speed up and down to maintain a set temperature. This pump will remove the overheating and react to supply hot water usage to save energy. No other controls needed. The screenshot below shows the simple laptop or iPad interface to set up the internal temperature program and to set the temperature and the sampling time.

In the last R. L. Deppmann Monday Morning Minute we selected a B&G Pump after determining flow rate and pump head. This week we look at the various means of pump control.

An Aquastat similar to the Bell & Gossett AQ-3/4 shown above turns the pump on at 100°F and off at 120°F. Obviously, there are other control brands with more options for temperature. The simple controls mentioned above may be combined. The B&G NBF pump could employ both the TC-1 and AQ. The pump will control the temperature, but only during the times set by the timer control.