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I have a Honeywell L7224U1002 aquastat and I am unsure how to turn the temperature down. The water is 180 degrees.

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I fixed it by holding in the 3 puch buttons for 3 seconds and then I was able to lower the temp by using the up and down buttons.

Posted on Jul 24, 2008

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Boiler Aquastat - How to set it


It is the coldest day of the year and your boiler is chugging along. However you notice that your house is slowly cooling off even though the boiler is running. Then you notice that the boiler is shutting down even though your house is not up to the thermostat temperature setting.

You look into the situation farther and notice that you boiler temperature is below say 180F. What is shutting the boiler off? The device that controls the temperature of your boiler is called an aquastat. This device senses the temperature of the water in your boiler, and then fires the burners to keep the water at the temperature call for by the aquastat.

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The other role that this device may play is to keep the boiler from getting too hot and making steam. However for this time we will concentrate on the lower side and the heat of the water. If you have a house that has barely enough baseboard or radiators for that really cold day then you need your water to be very hot or around 200F. This will give the water enough BTU's to carry around the piping to give off to keep your house warm. The downside is that it also makes your boiler less efficient when it needs to heat the water this hot.

So, now you know that if you need more heat you can turn the aquastat up higher to get more heat and turn it lower on the milder days to save energy. Another way to do this is to buy and install a smart control that will do that automatically for you. These are called an outdoor reset control and will vary your boiler temperature according to the outdoor temperature, saving you money and keeping you warm all at the same time.

Now, the one thing you need to know yet. The aquastat is usually a gray box with a screw driver slot in a little wheel that has numbers on it. It is often hidden pretty well and may take some looking to find it. Some of the newer boilers may have a digital one that is in a bigger gray box. Read the instructions to learn to change the temperatures.

Setting your aquastat correctly can save a lot of money and it can be the difference between keeping you warm or not.

on Dec 08, 2009 | Heating & Cooling

1 Answer

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...

2 Answers

How do I adjust the faucet to get the water hotter?


If you have a hot water heater there's where you turn you heat up for your water if its hot oil its on the furnace boiler

Mar 05, 2013 | Plumbing

1 Answer

Want to raise the water temp


Stand alone water heaters have temperature controls in different locations.

11_23_2012_12_50_47_pm.jpg
Most residential electric water heaters operate on 240 volts. Please, shut off power first whenever you need open or remove panels for adjustments or servicing.

"Traditional" electric water heaters have them behind removable panels - like the top and bottom gray panel on the water heaters on the right side of the photo. Both panels have adjustable controls behind them and both should be adjusted to the same setting.

Some newer electric water heaters use electronic controls. These may be accessible without removing panels and even have digital displays. Others have controls that are located on the top of the heater - behind a panel. Electronically controlled water heaters may or may not need to be powered on when making adjustments. Check your manual if in doubt.

Gas (propane & natural gas) type water heaters have the temperature control on the gas valve. There are often two controls on the valve, one for the pilot (off, light and on positions) and a second for temperature adjustment.

A tankless water heater built into your home's furnace is controlled by an "aquastat". An aquastat is a fancy term for a thermostat to control water temperature. A typical aquastat is mounted directly on or very near the furnace and looks like this:

11_23_2012_1_08_47_pm.jpg
Inside, are several temperature settings. Here's a photo of the interior of the Honeywell aquastat:


11_23_2012_1_12_16_pm.jpg
The Hi dial should never be set to a value lower than the Lo dial. "Safe" settings are Hi = 180, Lo = 160 and Diferential (above "Lo") = 10. You'll need to tweak these up a bit to make water hotter. You should read more about settings for these aquastats here. Skip down to the section titled "What Settings To Use on a Heating Boiler Aquastat Combination Control"

I hope this helps & good luck!

Nov 22, 2012 | General Electric GE SmartWater Household...

1 Answer

I've lost my manual, and am unsure what the heat


You posted under water heater.
Open following link for adjusting water heater temperature on typical gas and electric water heaters:
State electric has ABC
White Rodgers gas thermostat has ABC
Honeywell gas valve has ABC
Each is shown on following link:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

60 degrees C is 140 degrees F.
You can get burned pretty quick at 140 F.
I suggest 125-130 F and see if that works
First aid for burns is to apply cool water immediately.

Jul 09, 2011 | Rheem Water Heaters

1 Answer

Is it possible to lower the top temperature on the thermostate. I can change the lower temp but not the max which I wish to set below the 180 level. Thanks


there is a high and a low limit on these units, the two control knobs are actually the reverse of what you are trying to accomblish,first lower the bottom or low cut off temp first then the high temp ,it must cycle a couple times for it to adjust

Jun 06, 2011 | Honeywell L4103A1019 combination aquastat....

1 Answer

If i am away for any length of time, do i put the temp on vacation? does the water still get warm?


Since you didn't provide the brand & model of the thermostat, only generic help can be provided.

Most furnaces that run on oil or gas, make hot water all the time, 24 / 7 - winter, summer and everything between so to speak. They are controlled by an aquastat that may be set for any value between 140 - 180 degrees F. This is called "hot start" - simply because when the thermostat is set to a temperature higher than the room (turning heat ON), the water is already hot in the furnace, and is circulated immediately. If it was a "cold start", you'd have to wait for the water in the furnace to heat up from room temperature. This would substantially increase the amount of time it would take to heat the room.

Generally, the "vacation mode" simply halts the program from running. If your thermostat changes temperatures several times during the day / night, it will simply hold the lowest temperature - or a predetermined temperature built in - or chosen by you. You'll need to consult your manual to determine just how your thermostat handles the vacation mode setting. Post again if you can't find the manual - but tell us what brand and model it is.

I hop ethis helps - good luck!

Many heating thermostats don't allow for setting a temperature below 45 degrees F so freeze ups shouldn't be a problem.

Sep 30, 2010 | Heating & Cooling

1 Answer

Short burn cycles


if thats a new themostst it sounds like you didnt set the cycle dip switches correctly,the type of heat you have is unknown to the thermostat so you have to tell it or it may short cycle or overheat

May 02, 2009 | Honeywell Heating & Cooling

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