Question about Laing Thermotech Autocirc Undersink Instant Hot Water Circulating System

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Punp ACT 303-BTW was working fine. Got some water leak under sing. Disconnected the pum fron electricity, dryed good and when plug it in had a "POP" sound and lightning fron under the timer. It kept running for a while. It stopped and was very hot on the upper part of the pump. Now it doesn't work at all.

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If you had a "pop" and lightning from the timer....
the water got into the electronics.
its time to replace.
getting hot.... was the cartridge either spinning dry, or spinning but not able to move water, did you have a valve off somewhere?
you might call laing or one of their distributors and see if its under warrantee.
where are you located, I can probably help you find a distributor.

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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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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Please rate. Thanks jj505

jthomefix

gmail.com

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