Water Recirculation Question; Author: jhilderbrand (CA) I had a water recirculation pump that was original to the house and froze up. No light in the furnace. Enter the numbers and see the savings. Fill out the form below for more information on Grundfos hot water recirculation pumps. So we felt the zone piping close to the circulator: it was stone cold. If you know do not know how to do this safely STOP and ask for help from a trained service technician or licensed electrician. indeed it might work for you as well. Includes pump, hose kit, bypass valve and digital timer, Wet rotor design for whisper-quiet and maintenance-free operation, Stainless steel rotor cladding and canister construction, Compatible with tankless water heater systems, Saves up to 12,000 gallons of water per year, LED light indicators for pump settings and alarms, Wireless communication, no wiring required. Frank: in addition to Buddy's suggestion just above, some other reasons that heat may not turn off in a building include: I have a Gas Hydrotherm 86000 Model R108 furnace. That told us that the circulator motor may have been hot but the circulator pump wasn't pumping. Also check for a bad relay in the control. On 2020-08-28 - by (mod) - main cause when you have to Jump L1 to C1 to get the boiler to fire up? I'm sure they'll be glad to help you select the correct one. Great information here. INT: 001 (480) 353-3020, On 2020-05-14 by Clay So can a mix of different brands of zone valves that require different wiring. 4. If you jump or connect together the two thermostat terminals on the Honeywell L8148 you're eliiminating a bad thermostat wire or bad thermostat from the problem. Depuis 50 ans, DIFF est distributeur de pièces de rechange multimarques pour les équipements thermiques et de climatisation. The Grundfos Comfort System provides all the components needed to retrofit a hot water recirculation system in a home under 2,500 square feet without a dedicated return line. His boiler is 45 years old and we got a quote today of $8,000 to replace it. We replaced the aquastat and indeed now any thermostat that calls for heat can both turn on the circulator and if appropriate (based on temperatures at the boiler) turn on the boiler's oil or gas burner when it should. Taco zone valves and ZVC unit were installed by plumber a few weeks before this issue started late last year. The furnace is in good shape hate to replace just because cant find aquastat. range for the control, + labor to install.Find a different heating company. You can pretty much figure that none of us is likely to encounter a problem that no one has met before, and we can further bet that somebody already has a solution. The most common cause of temperature overshoot when an aquastat isn't working properly is improper setting of the aquastat's sensor probe into the sensor well: it may not be contacting the sides of the immersion well or it may lack the temperature-conducting-grease recommended by Honeywell.Other causes of an aquastat whose high-limit is allowing temperatures to exceed that setting include a failed sensor probe itself or possibly a defective relay or circuit board in the aquastat. It is time for a new thermostat, but I don't know what to buy. My circulator pump is not starting when the boiler starts. starting up unless we smack the cover of the aquastat repeatedly ... and Resilient mounting helps provide quiet service. Aquastat manufacturers such as Honeywell make clear that. I suspect a loose wire, loose connection, failing aquastat relay, or possibly a bad connection between the aquastat's temperature sensor and the sides of the well into which the sensor is inserted. I have a tankless coil. Fortunately the heating company is a good one and their service manager sent a better man to finish the job right. The oil burner runs, but the LO control is preventing the circulator from coming on. If you can provide any insight to our problem, we'd greatly appreciate - Wayne, 2017/11/29, This Q&A were posted originally at AQUASTAT CONTROLS - home. Bypassing the tankless would be expensive and I guess I'd need to then have the tank wired so that it triggers a higher water temp (additional aquastat?). Joe, from your description we can exclude the case that the boiler does not run because it's already up to temperature - since you say that you feel no heat in the problem circulator piping and baseboards. We have found this problem lots of times when a homeowner or someone else messed around with the HI, LO, and DIFF settings on the aquastat without having a good idea of what those dials do. Do you have any Ideas for a replacement universal aquastat relay. If the circulator pulls-in, does the circulator motor run? That could happen because the aquastat that is off on safety and needs to be reset or there could be a defective relay in the control. - J.M. The plumber ran new thermostat wire on zone in question (not sure why that was needed) so it is not likely to be a wiring problem, but I will check. This problem could be due to a wiring error or a control problem, as we detail below. I walk her through those steps and taking off Tstat, connecting red and white wires. Watch out: opening the cover and / or touching electrical connections while power is on to any electrical device risks shock or death by electrocution. A hot water recirculating system guarantees you have instant hot water at the faucet.. My first suspicion is the same as yours. Tapping on the aquastat to get it to run suggests to me a failed or failing relay or a loose electrical connection.$2,200 to replace an aquastat sounds crazy. Repaired solders on air scoop loop (left side), 4. I heat most of the time with a coal stove so the only time the furnace runs is if I go away for a few days. I'm impressed. In fact, you can think of them separately, and controlled separately. Then it'll be a Dos Equis if I'm in Mexico or a Castle Danger Ale if I'm still covid-sequestered in Minnesota. I'm new to boiler maintenance, but I have a good grasp of how the system works and how to properly maintain it. I'm not sure about the L8024B series information you've received, and I understand that there is not necessarily "universal" replacement for all applications, but in fact the Honeywell L8124 series (AQS8124B1039 or the Honeywell Multi Function Aquastat L8124B1039) can substitute for many of the controllers in the L8124 and L8024 aquastat line. When it called for heat the relay keeps engaging and disengaging. Our photo immediately above shows settings that OK - the HI is set to a little over 180 and the LO is set to 160. this morning the boiler was not heating. - Steve 11/7/2012. We recently observed the symptoms, debugging, and solution to a similar no-heat in one zone problem. Mr. Cavallin replaced the circulator pump: problem solved. 6. OK sure, don't over-bend and ruin the probe. When I operate the other thermostats in the other zones of the house, the furnace kicks on and heats the the water to temperature. This is the 3rd unit installed, they seem to last about 5 years and quit. Because there are three circulator pumps and circulator relays, each controlled by an individual wall thermostat, it seems unlikely that all of them are bad. When I put my hand on the pipe directly coming out of this zone valve the it is warm at best. I usually have to clean contacts to get it running when I use it. Is it manual? When I raise the thermostat (upstairs zone) I can hear the circulator pump kick on, the switch on top of the zone valve is in open position and I can hear a click come from the boiler. Nelson that sounds as if a circulator relay in the aquastat is shot, the circulator is not running, so the boiler water stays hot, doesn't get cooled down by being pumped through the radiators or baseboards. At the thermostat the temp controls do not turn on or off the boiler. it. My Honeywell R8182d 1111 keeps tripping the red safe button. I finally figured that none of the circulators is running. On 2019-08-14 by (mod) - Tapping on the aquastat to get it to work. Aquastat is L8124C1102. These wells are replaceable but I'd be rather nervous about pulling the well on an old boiler - worried that the threads and mount will disintegrate, leaving me with a dead boiler. Skip,Thank you for a great question and one that has plagued lots of service technicians.To have room for a detailed answer I repeat your question and reply athttps://inspectapedia.com/heat/Aquastat-Immersion-Well-Thermal-Grease.php#ProbeStuck Details, photographs, and an explanation are. After some investigation I also discovered the aquastat (Honeywell L4080D 1036) appeared off by anywhere between 20-50 degrees from the boiler temp gauge causing a runaway condition. I have also seen in homes that set the thermostats to low, that freezing occurs in the loop, and thus, poor heat output. This cycle repeats to insure the water in the hot water lines is always hot. Honeywell Aquastat Controller L4006A 1678 Honeywell Aquastat Controller L4006A 1678 SKU: AQL4006A Was $135.00 Sale Price $119.99 I have a 17 year old Rheem boiler which works just fine. I newly installed a L8148e Aquastat. If i knew what to replace I would. A better heating diagnostian than I (Kevin from Cavallin Heating, Two Harbors MN) checked out the circulator and seemed to get it running again. AQUASTAT SELECTION GUIDE Beckett ASF boiler, Honeywell reset and thermostats. All component materials are NSF and/or FDA listed. I've done everything I can think of to ensure good contact with the immersion well (pulled the well and cleaned it, put it back, used thermo conductive paste, even HELD IT IN AGAINST THE WELL WHILE IT HEATED). Easy to install. What should I check? How do you get a aquastat out of the thermal grease that is acting like glue?? InspectAPedia tolerates no conflicts of interest. She calls in panic that house is cold, turning on and off at Tstat and/or main power switch on furnace does not fix problem. As I said, its intermittent - happened twice last winter, twice since Thanksgiving this year. It’s document.write(new Date().getFullYear());. While the cover is off of the control, look with care for evidence of overheating or burning around any of the wire connectors or contacts At below left are burn marks around the lower-left power-connection screw. The versatile, intuitive UP 10-16 and the ALPHA2 — both powered by highly efficient permanent magnet motors — set the industry standard for excellence in operation no matter the size of the home. Small loops/zones do not take the heat away as fast. Shes not comfortable with electrical stuff so did not ask her to jumper the T-T screws to see if burner/circulator gets going. The hot water tankless is disconnected as I have a gas hot water tank. Prices are in the $80 to $225. Its versatile design means it can be used as a replacement for more than 30 competitor pump models. see AQUASTAT HI LO DIFF SETTINGS to be sure your control has been set properly. I know what you mean about the plumber or heating service technician being in a hurry to leave - the photo below is one I snapped as a, frankly in my opinion terrible and therefore unusual heating service was rushing to leave the job, spinning his tires on the pavement and smoking up the driveway. The folks who told you there are no rebuilt aquastats - well I'm not sure if that's because they didn't know or they didn't sell. Available Accessories: 99521972 — Programmable Digital Timer Kit With Battery Backup96806130 - Bronze 3/4" NPT GF 15/26 Flange Dielectric Isolation Valve Set. I am trying to diagnose a hydronic system heat problem in my ex-wife's house 1000 miles from me (we are still friendly). - Honeywell L4080D 1036 error. Additional valves and hose kits are available for larger homes. Installation can be completed in less than two hours. Using a circulation pump is a great way of keeping water traveling throughout the system. I had to read a few times to put it all together, but I think I finally got it. Observe the temperature on the gauge. above the LO. I installed a new aquastat control about two weeks ago. If the cold water runs first through the tankless coil, then yes you are pre-heating water entering the hot water heater tank. Added iso valves at air scoop for vent and ET, 3. . See the full range of products. On 2019-05-14 by (mod) - How do you get a aquastat out of the thermal grease. The relay magnet switch on the aqua stay will not shut off. Honeywell say its discontinued they have no information for a universal replacement. Some plumbers pipe in the opposite direction, that is, allowing hot water leaving the hot water tank to pass through the tankless coil for a boost that takes effect when the hot water in the separate tank is nearly used up or is cool. I even used a syringe to place some paste into the well prior to inserting the probe.The probe fits quite snug with the heat conductive paste. Temp / pressure gauge seems fine - PRV was dumping as expected when temp reached ~230 and pressure climbed ~30 d/t steam formation.I purchased a compatible replacement recommended by Honeywell, but new Astat (Honeywell L6006A 1145) is behaving the same. Dan, thanks for the reply with good suggestions. With seven speed and pressure settings, including AUTOADAPT, the ALPHA2 ensures long-lasting, trouble-free operation in larger homes with higher flow needs, challenging operational environments or tankless water heaters. That's all the description I have. Nothing should look "burned-up". Often a failing relay unit will buzz in a heating system control. 5. replaced copper w/PEX for cold water feed from pressure inlet to halfway down to system tap (didn't want PEX to get too hot)SYSTEM: Boiler: Burnham Series 2 Model B (204) - installed 1995 / no major issues until now My DHW tank is a zone (tank was added after the fact), but only triggers the LO setting, so it doesn't get the the hotter water that my heating zones get. I am wondering why. Boiler reset button is tripped, but when pushing it back (with switches all on, and thermostat cranked up), no sounds of boiler spinning, just silence. Any suggestion is welcome. If voltage is everywhere it should be and a relay is clicking constantly OR a transformer is buzzing, those component(s) are probably bad. I'm about lost as to why this is happening. I have a Honeywell L4081B 1120 aquastat and need to replace it. Shown above, a hydronic heating system circulator pump relay control with its cover removed. Turn thermostat down - Turn the wall thermostat all the way down so it is not calling for heat. The 0012 3-Speed is a direct replacement for the Grundfos UPS43-44 3-Speed. After about 30 seconds the reset trips again. I would remove the probe, clean out the well, maybe scrubbing it with a stainless steel scrubby sponge, Please comment as we are of limited resources. The ALPHA2 takes reliability in small domestic circulators to new heights. another part of the body says C0704. I have a blue and white wire to connect to the gas control. Click to Show or Hide Citations & References, On 2021-02-12 Before I spend a lot of money on a new controller is there a way to diagnose it for being defective for only one zone? Series 100 3-Piece Oil-Lubricated Booster Pump - Provides easy field service with bearings, shaft and seal all housed in an assembly. So Iâv got a 25plate heat exchanger 0.69m2 surface.. itâs all working and the boiler side is extremely hot but the heat exchanger is not transferring the heat into the house side of things enough to stop the boiler coming on. - Anon 11/7/12. Photo (left) of a Honeywell L8024B & the wiring diagram below were provided by reader J.M. On 2021-02-01 by william woods helen woods. Could be a bad connection, wire, or burner or even a bad relay in the primary control.I'd call for help from a service technician. Recently, my circ pump failed, and while I was diagnosing this I noticed the boiler overheating and the pressure relief valve leaking or totally dumping (old pump was a near silent Grundfos - I never heard it run in 25 years). See INDIRECT FIRED WATER HEATERS for details of how these systems work. In fact I'm confused that you report not obtaining help from Honeywell themselves; we have usually found that the company's technical support personnel to be informed and helpful. where we include both instructions and also heating and cooling system parts cross-reference guides and charts. So, in effect, I pre-heat my hot water. Check your aquastat settings; if the LO is set too close to the HI then you're locking out the circulator. by (mod) This should be turning on the burner. GeorgeIf you have power to the aquastat but no power to the burner then the aquastat relay is not closing to power the burner. A boiler's circulator pump is used to remove hot water from the boiler, and then pass it into heating devices such as the radiator or a convection pipe system. Our photo of this very Honeywell L8124A aquastat control circuit board, with the wires removed, shows brown burn marks around the ZC terminal on the device. The body says L4005A2080. 2. General Support, except home products See AIR-BOUND HEATING SYSTEMS Indeed there could be a bad flue gas spill sensor, but I wouldn't start there. This unique motor advancement, pioneered by Grundfos more than 30 years ago, allows you the ability to adjust the pump ⦠Easy to love. What can be the problem? - heating service tech was in a rush: air bound heating system trouble. If you "cross the controls" - that is, if you set the LO to a temperature that is less than 20 degrees lower than the HI setting, you have basically locked out the circulators. I suspect the aquastat may have a bad relay, but I am not there to check by manually switching it. Macmillan Publishing Co., NY. See these additional details that could explain why your aquastat is not sensing boiler temperature properly, now found in the article listed just below - on using heat conductive compound. My zone valves are made by honeywell and I believe they are the newer version. when asking for heat, and there is power to the aquastat but the boiler wont fire up and the thermostats are calling for heat but the relay is making clicking sound. On 2020-01-28 by (mod) - boiler does not shut down until it reaches 220 deg. Grundfos plug-and-pump solutions for systems with dedicated return lines make installation and operation easy, circulating hot water throughout the house and varying the flow based on time, temperature or usage. I have called Hydrotherm they say call Honeywell. Based on 2018 average combined water and wastewater bill of $97.00 USD per month for 12,000 gallons per month. But, we noted, this home was built in the 1960s and had not suffered a known frozen baseboard line over its life. Easy to want. He lives in a small ranch house. NOTRE AVANTAGE. One time I took the cover off the aquastat and blew in it and it started. Would appreciate any and all thoughts. I have a R8182H controller and I have one of two zones that doesn't come on when the thermostat is raised beyond ambient temperature. Replaced backflow preventer due to slow leak / age. The cover on my thermostat says honeywell aquastat type l8100. 11/27/2013. - Charlie G., Calais, Maine. - it would be a shame to replace equipment when all that was needed was to blow or vacuum dust off of the existing unit. Here are more diagnostics: Heating zone air bound or stuck zone valve: Joe P. refers to a possible blockage in the problem heating zone. - Buddy 11/12/2012 See CHECK VALVES, HEATING SYSTEM. Waiting for hot water is a thing of the past. If clicking continues let's look more closely at what is clicking - probably a relay switch in the aquastat. When the temperature in the pipe falls the aquastat allows power to flow to the pump. The power of the pump is enough to cause the water to travel right back up to the boiler from the pipework. Grundfos offers the right pumps for all types of plumbing to deliver immediate hot water. Thanks for the quick reply! Hot water from inside the boiler itself circulates through a heating coil in the bottom of the hot water tank in response to a thermostat on the hot water tank. Do let us know how you proceed and what happens as that will help others. 1. See how the UP 10-16 range sets a new standard for energy-efficient hot water recirculation in residential homes. The heating zone, control, and circulator pump (or zone valve) that heats your separate hot water tank just looks like another heating zone as far as the heating boiler and its controls are concerned. LeonWhen the reset button (presumably on the primary control or aquastat or cad cell relay) pops or trips then the system safety control thinks that the burner has had power and has been trying to start for more than 20 seconds without producing a flame.So it sounds as if there's power to the control but not power to the burner itself. Only way to control it is by turning the thermostat on or off. Let's don't buy a beer until we find out what actually fixed the trouble. For example if HI is set to 180F then the LO must be 160F or lower. The LO and DIFF settings have nothing to do with that water heating method - the LO and DIFF make sense and are used when there is a tankless coil in use. - Joe. The circulator pump is new and functioning properly, could this be a malfunction of the relay. Not dissing the plumber, she makes me grumpy, too :-) I will talk her through using "skate key" to bleed air from (circa 1945) radiators. Right now the TPR valve is doing what it's supposed-to: relieving the pressure; however ultimately scale formation by that dripping water at the relief valve could cause it to clog, risking a serious BLEVE - an explosion. Check first for a loose wire or bad electrical connection. Continue reading at AQUASTAT RESET BUTTON or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Probe fits in Iwell fine, and in fact was too loose prior to adding heat conduct paste - now I have problems getting it in and out of the well (which, obviously I'm not trying to do often as I want best contact). Sorry Charlie G. but that's not going to work right. Duane 22 agences et livraison rapide partout en France People wait an average of two minutes from the time they turn the tap to the time they get hot water. And of course honeywell Tech support may have other advice. Aside from more sophisticated circuit testing, you might spot this kind of trouble by simple visual inspection of electrical controls and components. When any of my three heating zone thermostats call for heat, the boiler will run, but it seems to take forever for the baseboards to get warm, especially on the longer runs. I have an L4081B aquastat and it doesn't seem to be behaving like it should.From a cold start with no call for heat (I turned down the thermostats) the burner stayed on all the way to the HI setting (in my case 180°). In any case, you will probably need the services of a service technician to check out the controls or a plumber to replace a check valve if it is sticking open. Be sure to review your control and how it was used with your heating service supplier; I would be quite surprised if they couldn't immediately give you the part you need, but if you don't have success let us know and we will research further. Take a look at "Guide to Heating System Boiler Check Valves & Flow Control Valves" [to see if this information helps you determine if a check valve is sticking open. 8/24/2013, The reader ultimately let us know that the new control had been defective. We discuss aquastat problems such as improper adjustment, improper wiring, and relay buzzing or failures. If those were working before, and apologizing that I am shooting from the hip, let's do these basic aquastat tests. We have no relationship with advertisers, products, or services discussed at this website. I do have some heat conductive past left from the packet included with the new Astat. My boiler is UTICA model. I'm concerned about the heating season. not that I can promise this is the problem with Mrs. Ex. Check the low voltage transformer output: Check for 24VAC at the T and TV terminals - you will find 24VAC at one of these and 0 VAC at the other. OIL BURNER WONT RUN, and if that fails, see Three thermostats control three individual zone circulators (Taco brand). WellMate fiberglass bladder water pressure tanks are quicker, easier and less costly to install than steel tanks. Ex-wife said plumber was grumpy and eager to get out of there so might not have properly bled system. Lesson: look around and feel the pipes and get help from someone with heating system troubleshooting experience. On 2020-05-14 - by (mod) - need heat conducting paste to get aquastat sensor working. I really don't want to drop another $150 for another new Astat. Let's step through the diagnostics at If it is only in the one zone you describe: it may be that the boiler is up to temperature and does not need to "kick on". see DIAGNOSE & FIX HEATING PROBLEMS-BOILER - troubleshooting. I have three zone valves and only one circulator pump. my heater just don't stop heating my house i tried a new thermostat what should i try next please - Frank Carr 11/12/2012. He is 67 and on Medicaid doesn’t qualify for Social Security. I will try to clean out the well and probe once more and reinsert. The HI is set to 180 and the LO is set to just under 200!. The high limit does not function at all, and boiler is in runaway condition until I shut it down. MikeCHeck the "heat wont' turn off" diagnostic suggestions at HEAT WON'T TURN OFF and let me know what happens. Or see AQUASTAT DIAGNOSTIC FAQs questions and answers about diagnosing an repairing heating boiler aquastat problems. Installed in less than two hours, the system uses a bypass valve and pump with a 24-hour programmable timer to keep hot water available in the lines for immediate use. When domestic hot water is made by a separate tank heated by a zone on the heating boiler, we call that an indirect-fired water heater system. The photo (above left) illustrates Charlie's aquastat with improper settings for the HI and LO. Timothy Vente en ligne pour SAV et exploitants de pièces détachées chauffage, chaudières, pièces de rechange chauffe-eau, pièces ventilation et climatisation. Of course there can be a more subtle failure: recently in a Minnesota home we found that the cast iron baseboards in one of the heating zones would not warm up even though the thermostat was calling for heat and the circulator appeared to be running; Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. I know HW Astats are not scientific accurate, but I definitely don't think this is correct operation.Any insight or advice on what might be the problem here? The diagnosis can be as simple as feeling for temperature changes along the pipes when the circulator is (supposedly) running. If that opens the valve then we know the problem is in the TT or its wires. Check circulator terminals: Now while still calling for heat, check that the aquastat is also sending voltage to the circulator pump - look for 120VAC at the C1 and C2 terminals. Instructional Technologies Institute, Inc., 145 "D" Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987. Any idea what is going on here? Separately at RELAY CONTROL SWITCHES using a water pump pressure control switch as an example we discuss clicking and chattering relay switches.
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