Question about Heating & Cooling

Open Question

L4080B1295 hi-limit Aquastat This is a temperature control on a hot water heater.

Posted by on

2 Suggested Answers

refritech08
  • 149 Answers

SOURCE: I want to adjust the

To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed:
• HL —High Limit.
• LL— Low Limit.
• Ldf —Low Limit differential.
Then press the UP and/or DOWN buttons to move the set point to
the desired value. After 60 seconds without any button inputs, the
control will automatically return to the READ mode.

(copied from honeywell's instructions)

to clarify the differential is cut in minus the cut out.
Hope i can be some help to you.

Posted on Apr 21, 2008

walterkunesk
  • 683 Answers

SOURCE: Im trying to install a

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

Tip

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.

12798d5.jpg

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

Why will my boiler not fire up for heating but works fine on hot water


you have a triple aquastat that maintains a temperature level needed to provide hot water. but you are not getting the thermostat to operate the central heating. The thermostat is a switch that operates by temperature. if you have tried raising the thermostat and the system did nor kick in try jumping the thermostat terminals in the aquastat . if that works then the problem is either in the thermostat or the wiring to the thermostat. also with a electrical tester." while the thermostat is jumped" test the c1 and c2 terminals to see if power is going to the circulator. If not then you need a new aquastat. if you have power and the pump is not moving water replace it.

Oct 11, 2014 | Water Heaters

1 Answer

Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"
this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

Feb 02, 2013 | Water Heaters

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

Does the boiler thermostat control the heat of the radiators as well as the hot water temperature? Does the thermostat control the water temperature and the pump - as our pump seems to be on all the...


There should be a control called an aquastat that regulates the temperature of the boiler. The thermostat will turn on the circulator to start the flow of water through the radiators. If the water coming back from the radiators is very cold, a control will shut off the circulator until the boiler can come up to a predetermined temperature then start the flow of water again. If you have a tankless coil for domestic hot water, you now have a triple aquastat that maintains the temperature for domestic as well as the boiler temp. So yes the boiler thermostat (aquastat) does control the heat of the radiators and domestic hot water. No the pump is regulated by your house thermostat. You should take an amp draw on the boiler and componants to find out what is drawing more electricity than it should and popping your fuse.

Feb 19, 2011 | Heating & Cooling

1 Answer

Boiler overheating


the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

Oct 08, 2008 | Water Heaters

1 Answer

I want to adjust the hi and low water temp limits for my oil hot water boiler; I have a Honeywell L7224 aquastat but I cannot find any temperature indicators; how can I do this?


To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed:
• HL —High Limit.
• LL— Low Limit.
• Ldf —Low Limit differential.
Then press the UP and/or DOWN buttons to move the set point to
the desired value. After 60 seconds without any button inputs, the
control will automatically return to the READ mode.

(copied from honeywell's instructions)

to clarify the differential is cut in minus the cut out.
Hope i can be some help to you.

Apr 21, 2008 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

203 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2398 Answers

Dan Webster
Dan Webster

Level 3 Expert

8205 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...