By 'closed discharge' I assume that means a pressure tank!
I give up. All too hard. Will have to look at a Grundfos like most of the neighbours have and delete the pressure tank.
Browse Forums Eco Living Re: Rinnai HWS & Pressure Tank 22Sep 12, 2016 5:55 pm firebird By 'closed discharge' I assume that means a pressure tank! Anything that either stops or severely limits water discharging from the pump. Turbine pumps also increase power usage when the output is reduced. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Rinnai HWS & Pressure Tank 23Sep 13, 2016 9:09 pm Would this work with the pressure tank? Controller comes with a fully adjustable cut in (start) pressure of between 0.5-6.0 bar and a cut out (stop) pressure of between 0.8-9.8 bar. http://www.theirrigationshop.com.au/sho ... p?prod=781 https://youtu.be/UF4v7Uvn_PA Re: Rinnai HWS & Pressure Tank 24Sep 16, 2016 11:32 am I didn't know that this product existed, it is an overdue innovative product for our market and I am going to buy one myself and do some long term testing. I have asked around but I haven't found anyone who knew of it either. I have been puzzled by a couple of things that you have posted. See below. We know that your pump has a 35 metre head which is about 49.7 psi or 343 kPa. firebird The controller is only adjustable for the cut-in. 1.5 - 3.5 bar. The cut-out is fixed at 8 bar (around 116psi), firebird The guage on the controller quivers around the 4 bar mark for 3-4 mins then finally cuts out. 4 bar is 400 kPa or 58 psi. I feel that your current turbine pump has been damaged by constantly operating against a closed discharge and I base this on your post below. firebird In regard to pump run times, the pump does seem to "run on" when recharging the pressure tank. Actually, have noticed it is taking longer than when first installed. I've tried adjusting the pump but still obviously doesn't bring the cut off low enough to stop the "run on". I would be tempted to disconnect the pressure tank for now because the current pump is low power and most probably well into its life span anyway. Alternatively, you could buy the adjustable controller you posted knowing that if you required another pump in the future, then the controller could also be used for that. You can buy pumps without controllers. Turbine pumps are low power units that generate good head due to the impeller design but their use with a pressure tank is not common. The only thing that you would need to experiment with is the cut out setting because you already know that the cut in should be about 2 psi above the tank's 30 psi pressure...which is also adjustable. Maybe start off with a cut out of 42 psi and see how it goes. If you speak to the guys at Irrigation Warehouse, maybe ask them their opinion of using a turbine pump with a pressure tank for your application. I would also be asking Rinnai their opinion about using a pressure tank with their unit. Good luck. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. First time building 2 storey home, is under construction (in Framing stage) in NSW. I have 3 toilets and need bidet spray in… 0 16851 18 90476 |