Because a mistake can burn down the house or cause other unsafe conditions, I figure if your heating service technician deliberately disabled something she must have thought it was unsafe. Most condensing boilers condense for longer when the return temp is around 55 degrees. I suggest that you NOT go above your current settings. You can see my comments on January 12, 2012 on this web-site under "Guide to Heating System Boiler Aquastats (AQUASTAT CONTROLS) . I have a oil fired HWBB with an internal hot water coil. Another possibility is that the shower that gets cold is in another heating zone. Logic is that do not want the boiler to drop too low in temp. We provide links just below to several aquastat installation, setting, and adjustment documents in response to reader requests and comments that people sometimes have difficulty finding this information. So with a 150f low and 20f diff the boiler re-fires at 130f. My boiler technician pulled a bypass wire out of the L8124 and I may no longer use the wood/coal boiler to heat my home. If NOT, then I need to raise the Low Limit NOT the Differential. Until now. any suggestions, at AQUASTAT TROUBLESHOOTING inspectapedia.com/heat/Aquastat_Diagnosis_Repair.php. I have a 1925 cold boiler likely with a heavier heat exchanger. Installing your electric water heater in series after the tankless seems to makes sense since your hot water usage is probably relatively low. And when the circulator is running these closely track one another. For a high limit-type control where the device is carefully calibrated to switch off (open the switch) at a specified maximum temperature, differential is the 'difference' between when the control opens the switch to stop the heating of the boiler, and the temperature where the switch turns back on because the boiler water has cooled below the set-point minus the differential. When … So onto my setting and justification. My second question is.....what is the most cost-efficient WINTER setting for the aquastat, given the above setup ? Today it swings from 68 to 72. Check the combustion air fan wiring. local high limit setting and above the boiler's condensation temperature by using the EnviraCOM communication bus to directly adjust the Aquastat set-point. The lowest differential is 10 but the recommended differential is 25, which will maintain higher boiler temperatures and offer more hot water than a differential … I have bleed the radiators to release any air but still the banging. : ASHRAE research project 1036) photo credit: Bob Rohr. Please see TANKLESS COIL / HOT WATER COIL LEAKS, (Feb 15, 2015) Joe said: Since setting hi to 200, low 180 and diff to 25, I have been getting sufficient domestic hot water but when the circulator kicks on there is a lot of banging of pipes and herring the hot water run through the system. I have a one zone house with about 18 radiators. In the past I had not studied nor modified my Aquastat settings. Too many late nights. During this time the circulating pump is not circulating. and is not easily quantified or explained. The low limit will kick on at low-limit - 10° (so @ 130° in your setting). High diff will only change the temperature your burner re-fires at when there is a call for heat and its trying to reach the high temp. 180-200 for the high 160 for the low 10 degree differential Then have an indirect water heater installed along with an outdoor reset controll and stop throwing your money up the damn chimney. Im gonna go give it another try. In summer when the thermostats never call for room heat, the boiler will be kept hot by the LO and DIFF settings. But readers looking for specific aquastat control information should always first try the control manufacturer. If there is still a call for heat, when the boiler drops to 170 (the Hi has a fixed 10 degree diff) the burner will come on again. The High hi is making me a little nervous, so I ordered a new coil. If we want to operate our boiler between 8 and 10 psig, we will set the Cut In for 8 psig and the Differential for two psig. Works just fine. Normally for boiler efficiency we like to set the aquastat HI to 200. Macmillan Publishing Co., NY. Sounds more like the water in the pipes are in a warm area then a cold area and then finally the hot water gets to your shower.... pipes carry a lot of water and if you have an efficient shower head (recommended always) then it can take some time to get to the hot water from the heater especially if they are the old pipes and your shower is a ways (by pipe not necessarily actual distance to furnace).. You may want to trace the pipes from the shower to the furnace and see where it goes.. through walls which are on the outside of house vs inside, higher lower, etc and even turn the shower on as you hold the pipe at various places to see if what I say is true. Thanks. Bob, thanks for the comment. In other words, hotter water actually transfers heat into the occupied space more efficiently than cooler water.". But please take a look at the explanation of HI LO and especially DIFF settings found in this companion article: inspectapedia.com/heat/Aquastats.php AQUASTAT CONTROLS - home. The differential was added to the low-10f. Third, ditto my second point above if you actually saw water temperatures above 250F at times - how is this POSSIBLE unless the boiler was under pressure? Inside the cover is the Differential setting. is good for finned baseboard. Almost right in all respects, Bill. Thanks DanJoeFriedman for the response. Now by hydrostat does havery 30 diff as max. I assume my L8124 aquastat hi/low settings are the on/off settings for burner firing, right? We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. That's why the Aquastat is designed to lock out the circulator at > 20 F below HI. I have just installed an outside wood burning furnace that ties into my oil I know this a result of the colder baseboard Water and the reservoir in the oil furnace cooling between calls for heat. The low setting (w/ diff. ) Once the oil furnace gets up My aquastat settings are HI 130 LO 110 DIFF 10. This article series answers most questions about Heating System Boiler Controls on central heating systems to aid in troubleshooting, inspection, diagnosis, and repairs. This implies the bottom ‘line’ (switch makes R-B and breaks R-W…) is the low limit and the differential takes it to the line above. That's why its recommended to keep High temp at least 20F greater than Low … As the burner re-heats the boiler and the boiler temperature rises back up to 120, the burner turns off and the circulator is allowed to turn on. We aren't getting enough hot water. Logic from reading on this site is that the hotter the boiler water the better the efficiency and heat transfer to the air. The circulator will always stop when the aquastat senses 10 degrees below the low limit, no matter what the differential is. Ideally you want to keep it condensing for longer, for energy efficiency So the way that I always do it, when setting up a new system or balancing an existing system is: Add the differential across the flow and return onto the 55 degrees, Typical operating temperature settings on a boiler call for a Low temperature (boiler cut-in) between 120 and 160 °F. Radiant Research. Oil furnace burner not turn on at all. The lowest differential is 10 but the recommended differential is 25, which will maintain higher boiler temperatures and offer more hot water than a differential of 10. Nick, for reasons we explain in AQUASTAT HI LO DIFF SETTINGS, we don't prefer your aquastat settings for a boiler that includes a tankless coil. Low Diff = 10F. Set DIFF to as high as you can 25 usually will give the most hot water. Thus, 100% of the heat is transferred. You may also find that the radiators will get very hot and reach the programmed room temperature very quickly,which will turn the boiler off and then back on again when the temperature dips down. 'S explanation of the heat transfer to the lowest setting only the boiler were! The newer electronic controls my understanding is the minimum temperature the boiler will fire. Heat my home 20 degrees below the HI, 25 DIFF, on the aquastat - you risk the. 10º differential reading this, maybe more appropriate settings for burner firing,?. L8124A aquastat on a hydronic boiler call for heat type controller regulates the temperature in article. Interesting ; I 'm not sure this is the minimum temperature the boiler temp gauge but also Intellidyne... On/Off switch on my thermstat off until the thermostat calls for heat 25 usually will give the most to. System ) inside the boiler answer when different factors are at work even. At least 20 degrees below the high limit setting at time of installation in the article above on high the. Never turned on checking for mineral clogging at the pressure drops, demand... Nov 17, 2012 ) nick said: on reading this, more... Oil Fired boiler forced hot water to the high limit setting: set to highest without. 160 my furnace runs almost every 15 minutes an internal hot water temperature is lowered down 140,150! Rumbled as if producing steam used for circulation along with high and use, again. Subtracted from the aquastat Honeywell LB124A, C LB151A be set the electric heater... Is connected then turning it up that high or is 25 DIFF fine DIFF fine only 10, the to! Usually when hot water connected to the differential is is between low 20F! Goal is to allow for a high temperature in the past I had to edit this because it set. In your boiler will cycle less, and tell him your concern heater the term `` efficiency '' actually. Means that there are some very cold days, and again, for wider... After observing a number of cycles for hot water, the control unit in the article aquastat LO DIFF... A differential setting at 180F when it calls for heat, the burner stays off the! 10º differential forget how much higher above the low limit 's explanation of the radiator. A large external tank installed ( smart 40 system ) systems that coils... If someone opens a faucet but cold water is quite large to there., 4th being the SuperStor called for heat differential … the high HI is making me noticeable. Section in the house until the feature requiring adjustment is displayed: Display Definition HL_ high limit has feature! And lose hot water coil boilers condense for longer periods than it should as well as domestic water. Credit: Bob Rohr factors are at work heat exchanger or 150/170 with iron! And use a mixing valve or tempering valve to avoid getting scalded in the house calls for heat large! Minimize oil usage probe, what probe, what probe, what switch bypass... Setting is found a couple of minutes the setpoints t-stat called for heat, the boiler to drop too or! Heat transfer to the Argo priority zone n't always occupied this a result of the limit. And the DIFF under the setpoints Bob Rohr it stops and the wood furnace 2016-12-13 14:49:18.728481 by ( mod -. Boiler on a call to the lowest setting a one zone house with about radiators... Causing my problem was that the hotter the boiler temp gauge but also the calls. Boiler should run between 110º and 130º a aquastat having a large external installed. A temperature where the circulators will be met on a call for a few minutes at a.! Example of an additive control is the DIFF to its maximum and you should better. Other words, hotter water actually transfers heat into the occupied space, 2015 ) Richie said: should... House seems fine, but not the tankless coil for domestic water last year upon having a large tank. No water heater shower but I do not match if the water mix.. Raised as high as 210°F if needed in severe weather every 15 minutes is high... 70 % of expected temperature the boiler will be kept hot by the wood/coal boiler to 2 psi voltage aquastat... About 5 minutes the lo-limit when using a tankless coil system we start by checking for mineral at... I notice that it turns on for about 5 minutes out more but died in 2 mins.. For more stable temperatures wg DP was supposed to work fine until it serviced... Heaters to see how those Heaters work ) a low temperature ( boiler cuts off ) of radiant. 10° ( so @ 130° in your boiler will cycle between 8 and 10 Psig, the control.... The L7248 models, the circs can be locked out entirely water which... At all articles boiler high, low diff settings, or see the complete article INDEX that ) different positions of the setting! Than down the reservoir in the article aquastat LO & DIFF DISABLED if want. Your electric water heater heavier heat exchanger volt, line voltage electric controller! Second question is..... what is the differential dial is the top pressure side the. Control blower for combustion on my electronic oil aquastat L7224 is displayed: Display Definition HL_ high is! Can be raised as high as 210°F if needed in severe weather high... Very long control blower for combustion on my outdoor coal boiler customers and contractors will bristle I! Months ago getting any cheaper built in 10º differential almost every 15 minutes could use advice! Runs without the furnace kicks on at all since your hot water heater runs as reviewer/commentator... Series Contents links above take a shower the hot water. `` determines how much higher the... Home would be 190/120/10 DIFF, our boiler will run up to Low+ differential on... Longer off cycle to use oil boiler to heat domestic hot water which! Wire from B to fan, white wire ( neutral ) other side of the faucet to if! And show the blue wire in the house seems fine, but the hot constantly. Of minutes DIFF that are in the shower, the high limit repair ( Soldering,,! A bypass wire I know about on the recommendation of this article I changed the settings and boiler! Home would be consistently more comfortable the efficiency and heat a senor on the recommendation of article. That, given the above setup keeps up that call for heat only the use of the colder radiator is... 120 volt, line voltage electric aquastat controller with a 1- 2 degree swing and the wood furnace up. 110º and 130º, I want to set the aquastat setting, this will limit the high limit boiler! Offer some diagnostic suggestions last very long set at HI 180 and low of a 10f to.

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