Hot water heater pump temperature controller
Comments
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Are you trying to maintain a certain temperature on a domestic hot water recirculating loop?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Sounds like you're looking for a ΔT pump. IIRC Taco, Grundfos, etc. all make one.
I don't know how successful you'll be trying to add ΔT to an existing pump. 120V single phase motors just aren't well suited to speed control.
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Most all the solar controllers on the market could run a setpoint function.
The can modulate any non ECM circulator. It's basically a triac relay that does the speed control, a "wave chopper".
I think all the pump manufacturers have a complete system ready to go for DHW recirc with VS control?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Wave choppers have several concerns: Please see https://blog.orientalmotor.com/speed-control-basics-speed-control-methods-of-ac-induction-motorshot_rod said:Most all the solar controllers on the market could run a setpoint function.
The can modulate any non ECM circulator. It's basically a triac relay that does the speed control, a "wave chopper".
I think all the pump manufacturers have a complete system ready to go for DHW recirc with VS control?0 -
So far the solar controllers I could find have on/off control and will search further. Thanks for helping review.hot_rod said:Most all the solar controllers on the market could run a setpoint function.
The can modulate any non ECM circulator. It's basically a triac relay that does the speed control, a "wave chopper".
I think all the pump manufacturers have a complete system ready to go for DHW recirc with VS control?1 -
'Wave choppers" better known as PWM have been inplemented for a long time with out any issues to (Single phase) motors.
Small wet rotor circulating pumps use this technology in conjunction with PID to accive very precise temperatures.
One of the first european Pump manufactureres to inplement this was Wilo followed by Grundfos...Tekmar Makes standalong PWM controls..
Sometimes a simple Anti scald valve can also do the job as a KISS concept..
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I think Ken123 is looking for a Domestic Hot water situation..I think the Taco VT2218 circ pump is to be used only in closed loop systems... Not for domestic..pecmsg said:TACO Viridian VT2218
Can operate off of Delta T0 -
@Derheatmeister you are correct, • Equipped with a cast iron casing and should be used for closed loop systems only0
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Do they make it in Stainless?0
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With PID control seems like a good application and at low speeds the PID will adjust for low speeds?Derheatmeister said:'Wave choppers" better known as PWM have been inplemented for a long time with out any issues to (Single phase) motors.
Small wet rotor circulating pumps use this technology in conjunction with PID to accive very precise temperatures.
One of the first european Pump manufactureres to inplement this was Wilo followed by Grundfos...Tekmar Makes standalong PWM controls..
Sometimes a simple Anti scald valve can also do the job as a KISS concept..0 -
I am a little confused on what the Application is supposed to be for...
As far as i understand you are trying to contol the Domestic recirc line Temperature ?
Grundfos makes recirc pumps with a build in thermost(Shuts down once the temp is achieved)..
Do you currently have a Recirc line ?0 -
No, but may want to make a recerc line if I can work a design. I want to bring hot water from my house gas hot water heater to an heat exchanger and return. I want to measure temperature in my house sent to a temperature controller with PID function. The controller will out to an input of a pump speed driver such as an inverter feeding a pump installed in the water line. The inverter will power the pump.1
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I believe some members have used (previous versions of) these <https://controlresources.com/ac-fan-control-ac-motor-control-smartfan-nimbus/ > for analog control of small circulators.
What, exactly, are you trying to do? Using any sort of water heater for space heating is often (but not always) a bad idea, but it is always hard to do safely and efficiently.
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Yes, I am trying to do as you say. Please share some safety concerns. Thanks0
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One concern i have is called Legionnaires' disease.Ken123 said:Yes, I am trying to do as you say. Please share some safety concerns. Thanks
It can form in the HX,Expansion tank,waterheater,piping and fixtures...
Tekmar has a "Flush" cycle build into the program for this kind of operation,(Open systems)
I highly disagree with this setup as it can have devastating effects on human health if not mantained or operated correctly.
A friend of mine was infected by it,was hospitalized and allmost died from it.
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I studied Legionnaires disease a while back and it is present in the air but cannot harm us because our lungs prevent it from entering deep into the lungs. But if these is a mist the small droplets then can enter our lungs and infect us.Derheatmeister said:
One concern i have is called Legionnaires' disease.Ken123 said:Yes, I am trying to do as you say. Please share some safety concerns. Thanks
It can form in the HX,Expansion tank,waterheater,piping and fixtures...
Tekmar has a "Flush" cycle build into the program for this kind of operation,(Open systems)
I highly disagree with this setup as it can have devastating effects on human health if not mantained or operated correctly.
A friend of mine was infected by it,was hospitalized and allmost died from it.
Legionnaires disease may multiply in the exchanger and enter the Hot water heater giving a higher concentration and when taking a shower the mist may be concentrated with the disease. Thanks
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Also brain eating ameba's may get a foothold in the exchanger if the hot water heater is not hot enough.Derheatmeister said:
One concern i have is called Legionnaires' disease.Ken123 said:Yes, I am trying to do as you say. Please share some safety concerns. Thanks
It can form in the HX,Expansion tank,waterheater,piping and fixtures...
Tekmar has a "Flush" cycle build into the program for this kind of operation,(Open systems)
I highly disagree with this setup as it can have devastating effects on human health if not mantained or operated correctly.
A friend of mine was infected by it,was hospitalized and allmost died from it.
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Reviving an old thread. Can you say more about this option, or link to any resources? Thanks very much!Derheatmeister said:'Wave choppers" better known as PWM have been inplemented for a long time with out any issues to (Single phase) motors.
Small wet rotor circulating pumps use this technology in conjunction with PID to accive very precise temperatures.
One of the first european Pump manufactureres to inplement this was Wilo followed by Grundfos...Tekmar Makes standalong PWM controls..
Sometimes a simple Anti scald valve can also do the job as a KISS concept..
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