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Iam replacing a circulator pump (3k515)with an alternate model.I notice the old motor had a metallic propeller atttacthed to the front of it.My new one doesnt.I can put that propeller on my new model, but notice that when I was taking the old model off there where two non metallic propellers attacthed to each other with springs that came from somewhere.If they came from inside the housing of the pump motor,Iam okay because my new pump motor came with it's own housing,but if they came from outside the pump motor housing but inside the housing between the pump motor housing and other propellor attached to the piping running the water Iam screwed becaused I have no clue where they came from. Any kind of diagram would help.

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  • Rod Davies May 11, 2010

    Pump model please ?

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That is a coupler that is inside the propeller housing easy to replace.are you replacing motor only or complete pump and what brands

Posted on Nov 15, 2009

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Taco 007 circulating pump stays on even though boiler shuts down


Don't know your specific unit, but in general, heating systems are two-stage devices:

1: Its too cold: the motorised HW/CH valve moved to the required position, and on achieving it, the circulaion pump starts and the boiler is enabled. (The circ pump may start immediately - its not usually important.) The hot water from the boiler circulates through the heat exchanger and/or radiators until the thermostat thinks its target is warm enough, whereupon it disables the boiler, stops the pump and closes/relaxes the valve(s).

2: The boiler is off while disabled. When enabled, it heats the circulating water to a 'high' temperature and seeks to keep it there. If it reaches that temperature, the boiler will cycle on and off as necessary to maintain the set 'high' temperature. (The circulation pump must run all the time the boiler is enabled.) This may be what you're noticing. Additionally, some boilers will run the circulation pump for a little while after being disabled to reduce the temperature if the water in the pipes and boiler.

Your question doesn't say how the pump running corresponds to thee thermostat settings, but if it were stuck on, I think you'd know!

Dec 31, 2016 | Water Heaters

1 Answer

Recently we.had to have the motor replaced on our 3 year old Navien Combi boiler/tankless water heater because it made a squealing noise periodically. The technician who worked on it told us to let him...


This could actually be a manufacturer issue with the brand of pump. Based on your description it is unclear if this is a circulator pump, fuel pump, zone valve motor or other motor on your appliance. As a 30 plus year technician of heating appliance I have seen many parts factory defective, especially when purchased at the same supply house. Inventory is typically shipped to supply houses with manufactured parts from the same factory lot numbers, and when this happens, the technician keeps replacing a part with parts from the same bad lot!

Also, not knowing the true details of this situation, the installation set up, piping sizes, component brands, what means of air venting system was used in the hydronic side of this system, if any? With that said giving you a more specific answer is really impossible, based on the little knowledge I have to go on to help you out.

My recommendation would be to contact another company and have them come out to look at the problem, if you find the previous company charged you for parts that were not needed or the system was installed incorrectly, contact your local plumbing inspector for what to do in your area.
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Converting Atwood RV Gas hotwater heater with Electric ignition with a Gas/Electric


If they are on outside of tank , I'm thinking your new tank has motor-aid feature as well. That is used to circulate coolant through from engine of motorhome while driving and it keeps water heated. That feature usually adds to price of tank. Hope you didn't pay for some feature you"ll never use.

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1 Answer

Taco 007 not working


If the motor is getting warm I would suggest replacing the Cartridge assuming all the air is out.

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1 Answer

Laing model 330 Pump not working-delay in hot water delivery.In the past,a vibration occurred when cold water running above the pump.Can this be repaired.Power operating to pump. Thanks, mel ross


Question not 100% clear.

1) The pump is not working? Does the pump make a noise? if pump is not working full-time, it can cause delay in arrival.
If pump motor is suspect, and outlet has power, then check override switch located on timer. Set override to Timer, move some of the trippers outward, then manually rotate timer dial until pump turns ON.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
If no noise is detected, or noise stops and starts, or seems strained, or if pump is hot, then pump motor may have burned out.

2) If pump is working, and makes noise like a humming sound, and pump motor is not hot, but hot water is not circulating, then unplug pump so it will not overheat and burn up.
Disassemble the pump and cross-over piece. Clean piping with white vinegar or CLR. Do not soak in CLR or it will damage seals. Rinse parts thoroughly. Reassemble and see if problem is resolved.
If pump is vibrating, then suspects include sediment and/or air inside line, and this can be resolved by cleaning as described. Also install air vent to increase life of pump.

3) Other causes for hot water delay at faucet are crossover.
Crossover can be caused by bad single-handled faucet cartridge, and/or by clogged-or-failed check valve on cross-over piece on grundfos.
This type of problem lets cold water enter hot line, and causes delay in arrival of hot water. Clean-or-replace the grundfos cross-over piece, and replace bad faucet cartridge.
Open following link for testing instructions:
http://waterheatertimer.org/Crossover.html

Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

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Sep 17, 2011 | Laing Thermotech Autocirc Undersink...

1 Answer

Pump not working-delay in hot water delivery.In the past,a vibration occurred when cold water running above the pump.Can this be repaired.Power operating to pump. Thanks, mel ross


Question not 100% clear.

1) The pump is not working? Does the pump make a noise? if pump is not working full-time, it can cause delay in arrival.
If pump motor is suspect, and outlet has power, then check override switch located on timer. Set override to Timer, move some of the trippers outward, then manually rotate timer dial until pump turns ON.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
If no noise is detected, or noise stops and starts, or seems strained, or if pump is hot, then pump motor may have burned out.

2) If pump is working, and makes noise like a humming sound, and pump motor is not hot, but hot water is not circulating, then unplug pump so it will not overheat and burn up.
Disassemble the pump and cross-over piece. Clean piping with white vinegar or CLR. Do not soak in CLR or it will damage seals. Rinse parts thoroughly. Reassemble and see if problem is resolved.
If pump is vibrating, then suspects include sediment and/or air inside line, and this can be resolved by cleaning as described. Also install air vent to increase life of pump.

3) Other causes for hot water delay at faucet are crossover.
Crossover can be caused by bad single-handled faucet cartridge, and/or by clogged-or-failed check valve on cross-over piece on grundfos.
This type of problem lets cold water enter hot line, and causes delay in arrival of hot water. Clean-or-replace the grundfos cross-over piece, and replace bad faucet cartridge.
Open following link for testing instructions:
http://waterheatertimer.org/Crossover.html

Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

Add a comment for more help.

Take a moment and rate answer for accuracy:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Sep 17, 2011 | Laing Thermotech Autocirc Undersink...

1 Answer

Grundfos recirculating system. Never has produced semi instant hot water at sink it is installed on. Could the original comfort valve be defective


http://waterheatertimer.org/Water-heater-recirculation-system.html

The circulation system should draw hot water directly from the water heater as shown on illustrations on link above.

The Grundfos pump works on a thermostat, and some work on a timer.
Can you hear the pump working?
There should be a humming sound.
Check the timer -or- thermostat setting.

It is possible the lines are clogged with sediment if you have hard water.

If I was going to fix the problem:
1) check thermostat or timer
2) listen for pump sound
3) check electricity going to unit
4) take apart the pipes and inspect for clogging
If there is a clog, I would flush the line or soak the part in CLR (calcium lime rust remover)

The circulation pumps are sealed and there is no way to take apart the motor, timer, or thermostat for repairs.

add a comment if you need more assistance.

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It may just need a new pump coupling. Fairly inexpensive. I don't think you need to replace the whole burner.

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Some circulation pumps have a 3 phase mixing valve (cold,warm,hot) to regulate the water pressure in the building; no way to know unless you trace the plumbing. Basically, the hot water temperature could be lost because the circ-pump is cooling it with the cold water supplied to it. This is used to balance the pressure (aka Pressure Balancing Circ-Pump), so heater is really working overtime to heat the water. If the pump has two in and one out that's more than likely your problem; but you should consult a "old-school" plumber in your area.

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