I want to install a crossover valve at the farthest fixture and a recirculating pump at the hot water tank. My main concern is after the crossover valve has shut off because of the desired temperature how does the pump shut off. If the pump keeps working and the crossover valve has shut off, and the tap has not been open, will the pump not burn out because of the back pressure? I want to follow the same diagram on the top of page 57.
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Greetings saw,
As a first time poster Welcome to Breaktime.
This post, in response to your question, will bump the thread through the 'recent discussion' listing again.
Perhaps it will catch someone's attention that can help you with advice.
Cheers
The end move in politics is always to pick up a gun.
R. Buckminster Fuller
Well sawdust, let's try this one more time.
bump
Actually on a typical centrifical pump trying to pump into a deadhead is a low load condition.
On big pumps they will start them deadhead and then slow open the valve. It is done that way to reduce starting loads. You are more likely to overload the motor pumping into an broken pipe.
You can have problem with the pump boiling the water if it continously runs deadheaded. But that is only one very big pumps.
Before anyone else post such a message I will save them the bother.Hartmann you are an idiot. I always knew that you where an idiot, but now you go and prove it with that stupid statment.
Hey Hartmann, don't be such an liberal response based on your "feelings". You need facts.Ok.http://www.bellgossett.com/Press/BG-techtk699d.aspThe facts are that as flow decreases the hp required goes down.Look at the 9" (pump impellor diameter curve). It takes about 3 hp at 90 gpm and 75 ft head.But at zero flow it would develope about head of about 90 ft and require aobut 1.75 hp.
*snort
Got breezing thru posts and wondered who in the h*ll is calling Hartmanm an idiot!
Too funny.