Laing Thermotech Autocirc Undersink Instant Hot Water Circulating System Logo

Question about Laing Thermotech Autocirc Undersink Instant Hot Water Circulating System

1 Answer

I have a laing cirulating pump thats is worhing but now making noise so i took it apart see nothing but it was hot when running so is there any thing i can do to fix before it burns out

Posted by winsum2 on

1 Answer

Anonymous

Open following link for Re-circulation information and resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html

If the unit is getting hot, it may have already slowed and is now spiraling to it end.
Try bleeding air out of water lines, and clean autocirc with CLR calcium lime and rust remover.
Recirculation systems have a built in check valve so cold water side of faucet will work correctly. If this check valve is stuck open or closed, it can affect a lot of things in the plumbing system.
For example, stuck check valve can cause tankless water heater not to operate. It can also cause autocirc pump to overheat.
Lines, or elbows clogged with sediment can also cause same problems with recirculation system. If your system has direct return line to water heater that connects into the water heater drain port, then clog in line can cause overheated pump. Check water flow, check water lines, and clean out autocirc.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on autocirc or any do-it-yourself project.
Fixya is always less expensive than a service call.


Posted on May 08, 2011

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Cold water runs good; hot water diminished flow then shuts off completely.

Question posted under autocirc recirculating system.
Unknown if system has been taken apart and cleaned with white vinegar, or if faucets are single-handled.
Open following links to help isolate possible problems.
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/Crossover.html
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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

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.
0helpful
1answer

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.
1helpful
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I have the AutoCirc fixed thermostat model, and I installed it last fall as part of my bathroom remodel. It worked great for a couple months, but now it does not seem to be functioning at all. I have...

If pump does not turn on when set to ON, then it sounds like pump has gone bad or timer has gone bad.
http://waterheatertimer.org/Water-heater-recirculation-system.html

If pump runs but hot water does not show up, then you might have crossover problem:
http://waterheatertimer.org/Crossover.html

Recirculation systems cannot be exposed to hard water, or pump parts clog.

Upvote the help.
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.
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Where can I get the wiring diagram for the Laing Autocirc? I want to wire in a momentary switch so that when I am ready to get in the shower I hit the switch and the pump runs until the water is warm and...

If you have the same Autocirc product I have, then it cannot be taken apart. The timer seems to be connected and sealed together with the pump. If yours is different, answer back with the wires that you can see and we'll see if the timer can be by-passed.
http://waterheatertimer.org/Water-heater-recirculation-system.html

With the ordinary Grunfos-type pump that is not on a timer, you can add a switch and have the pump work on demand as you describe.

And they make a product that does the specific job you describe. It's called a Demand Pump. Link above shows two different types at page bottom.

I have not tested either Demand Pump shown. They operate on-demand ... when you activate the pump, the pump quickly brings water over from the hot water heater.

So the Demand Pump has a higher volume pump than the Autocirc or Grunfos.

I question a two things about the Demand Pump. 1) How will the increased pump pressure affect local pipes, especially supply tubes under a sink. 2) How HOT does the pump get? If pump gets hot, and it is located under bathroom sink next to paper goods, then that is a hazard. Some regional building codes don't allow ceiling light bulbs in closets because the bulbs get hot and start fires when people pack their closets full.
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