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How do I install Aquastat to Hot water recirculating pump? I see two yellow, two green a black and a brown wire. Which one goes to the timer?

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Plumbpedia™ 2: Grundfos Hot Water Recirculating Pump Timer Setup how do I install Aquastat - 9k= play_c.gif 7 min - Sep 4, 2008 - nav_logo7.pnhow do I install Aquastat - nav_logo7.pngi nav_logo7.png nav_logo7.png
Marty Hatley demonstrates how to set the timer and aquastat on a Grundfos hot water recirculating pump. For more information on this plumbing video ...
www.youtube.com/watch?v=URJ_-u6uDoI

Posted on Nov 12, 2009

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First My sister inlaw has a 3/4 recirc line. used the by pass h&c under last faucet to use cold as recircu line. Note acutal 3/4recirc is in kitchen but even thou closer to water htr. it is last for...


I don't understand everything being asked, so add a comment any time.

Problem1 is excessive electric bill.
Suspect is new 120Volt Taco recirculation pump.
Look at motor nameplate for amps and watts and HP. Taco pump is usually robust 1/3 HP which is 252 watts or same as running four 60 watt light bulbs.
If pump runs 18 hours per day x 252 watts = 4536 watts or 4.5 Kilowatts per day
Buy a kill-o-watt meter that plugs into outlet, and plug Taco pump into the meter for 48 hours.
This will give you total watts used for that time period.
1000 watts = 1 kilowatt.
Electric bill is probably 12 to 20 cents per kilowatt.
So if Taco uses 4.5 kilowatts per day, that is $.54 to $.90 per day multiplied by 30 days.
So cost is $15 to $30 per month.

Problem2 is Taco runs too long.
Taco operates either by thermostat or by timer. You choose which mode by using slide switch that is usually located under the timer dial. Set switch to TIMER to use timer, and ON to use thermostat, and off to turn TACO off.
If Taco is set for thermostatic operation, the Taco might be defective. Or there could be crossover problem at single handled faucet.
Another problem could be air in the water line: install air vent.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/How-to-set-timers.html

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No water is coming out of faucets and all i did was accidentally turn it a little bit what should i do?


Ok I see your re-post.
If I understand correctly, no water is coming out of any faucet.

No cold water and no hot water.

1) First of all, cold water side of water system is totally unaffected by recirculation pump or timer on recirculation pump. Faucets are connected directly to cold water line that enters house from outside, and that line does not come in contact with recirculation pump.
2) If you have no cold water, check with neighbors to see if they have water.
3) Next, go outside and check ALL outdoor spigots and see if water comes out.
4) Is it possible that you have a frozen water pipe?

Do some checking and then repost another question.
I will be here until you get it fixed.

Add a comment also to directly contact me.

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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.

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Does it matter which wire, red, black goes on l1, l2?


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New Timer--New Problem


Sound like you connected the timer up wrong, from my drawing check the following connections to the timer.
terminal 12 & 26 - Black (linked) mains supply
terminal 17 yellow/red (from rinse switch)
terminal 28 grey (from water level switch)
terminal 15 light blue (advance rinse switch water level switch)
terminal 27 brown (door switch)
terminal 25 brown (door switch)
terminal 62 green/black (motor)
terminal 7 red (motor)
terminal 32 yellow (motor)
terminal 9 blue (capacitor /motor)
terminal 8 white/yellow (motor) and white (water solenoids hot and cold)
terminal 71 pink (water selector switch and hot solenoid)
terminla 72 purple (water selector switch and cold solenoid)
terminal 70 white/blue (water selector switch)

Watch the light blue wires as there are several of them!!

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