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Im trying to install a Honeywell 1610 aquastat with a grunfos pump on a 3/4" recirculating line. When the aquastat is mounted on the recirc line it does not activate or deactivate the pump. When its moved to the 1" main hot water line coming out of the tankless water heater it works. Obviously the aquastat should be mounted on the recirc line or is it ok on the hot main?

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It can be installed on the supply line but if the system is zoned DO NOT put it on a zone line but on the main header. thank you.

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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Heavy duty astro model 457864 how do I set the event timer


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How do I disable low limit


WHY???????????????????
Only common sense option is to remove the Aquastat as you can adjust the lower limit down but NOT disable it. Bigger question may be What are you trying to do and do you know what you are doing???
Aquastats are made to START and STOP Pumps in Recirculation systems at settable limits not run them 24/7.
Running a pump 24/7 voids the heater warranty.

Sep 11, 2014 | Honeywell L8124a 1007 Triple Aquastat...

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Pump is plugged into a hot line and will not run. It ran just over 3 months and quit totally.


Hello Mr Johnson.
I will help.
I am timer expert at fixya. Fixya answers question. We are not home depot or warranty carrier for grunfos.
Here are some ideas:
1) Buy another pump at home depot and return defect in new package
2) Talk to manager at Home Depot.
3) Check if outlet has power. Plug recirc pump into different outlet.
4) Check if override lever is set to OFF, because pump will not run when lever is in OFF position: Here is photo I took showing positions for lever:
http://waterheatertimer.org/Water-heater-recirculation-system.html#lever
5) These devices are prone to surge event. Nearby lightning strike can burn out any electrical device by energizing wires. The surge can follow any path seemingly random trying to find path down to ground.
Add a comment and say what happens.
Gene Haynes

Jun 04, 2013 | Laing Thermotech Autocirc Undersink...

1 Answer

Is there a timer for a up1529sf?


Plug grunfos into any timer with 3-prong outlet.
Analog: Intermatic TN311C up to 3-on-off per day minimum 1/2 hour
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#TN

Digital: Woods 50009 or 59377: 7-day programming down to minute
http://waterheatertimer.org/Woods-timers-and-manuals.html#50009

Generally a Grunfos without timer will operate each time water temperature inside pipe falls below 90 degrees.
http://waterheatertimer.org/Water-heater-recirculation-system.html
So when timer turns ON, then grunfos receives power and thermostat must sense temps below 90 before pump turns on.

Mar 12, 2013 | Hardware & Accessories

1 Answer

Should the return line come into drain of water heater or cold in.


Your question is not complete.
You have gas water heater in attic?
You are installing recirculation system? Which recirculation do you have? .. so expert can read instruction manual alongside you.
You can connect the recirc return line to the water heater drain valve only IF you have plumbed a separate return line for that installation.
Otherwise, the recirculation return line recirculates into the cold water inlet on water heater.
Copy following link for general illustrations showing both types of installation.
http://waterheatertimer.org/Water-heater-recirculation-system.html

Aug 08, 2012 | Grundfos UP10-16BU/ATLC Comfort Series...

1 Answer

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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Well my furnace wont turn on at all i got power to the aquastat "honeywell L8148A1017" but no power coming out of the b1 b2 "burrner outs on the board at all but i hear the click in the...


the relay on the aquastat is probably bad ( contacts ) try actuating the relay with a screw driver to see if it engages the unit. if it does theres your problem new aquastat

May 09, 2017 | Honeywell Heating & Cooling

1 Answer

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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1 Answer

Does grundfos rcp96 pump work with bosch 2400 eo tankless heater?


What is your reason to have a recirc line on your water heater does the heater sit to far away from a certain fixture? If you put a pump on your tankless waterheater then your heater will continually fire till the call for hot water is stopped. Yes you normally do need a seperate line installed for a recirc line usually from the water heater to the farthest fixture away. If your problem is taking to long to get hot water then I suggest installing a second heater closer to problem area.

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