Question about Honeywell Heat/Cool Thermostat

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My john wood hot water tank over flows through the relief valve every 3 - 6 months. The hot water is too hot and I can't seem to adjust the Aquastat L4103 on the hot water heater to a good temperature. What should I really be looking at when I am setting the temp? Should I look at the 6 oclock position or the marking on the 10 oclock position????

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There should be plate on the front of the hot water heater tank.. Pop that off..
There might be some insilation to move and you should see a set screw for adjusting the temp..
If there are no indications for hotter or cooler - then do a 1/8 turn to a 1/4 turn counter clockwise..

Hope this helps !I
rate me good ;o)

Posted on Jul 14, 2009

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If the release valve referred to is the pressure release valve, then a water leak out the attached vent pipe is an indication that the valve is failing. To change the valve, the water must be allowed to cool (turn off AC power or gas) and the water level inside the tank must be lowered (drained) to below the level of the pressure relief valve. Once this is accomplished the vent pipe is unscrewed from the relief valve and the pressure relief valve is unscrewed from the water tank. A new pressure relief valve with a sealant on the threads, is then screwed and tightened into place with the outlet port facing downward. The vent pipe is attached to the new valve and the tank refilled with water. A hot water facet must be opened to allow air to exit while filling. Upon becoming full (water will begin to flow from facet), turn off the facet and restore AC power or gas, therefore allowing the water heater to heat up. When the first hot water is utilized there may be some air expelled from the facet.

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How to Clean Hot Water Heater


You may just think that you need to clean it out or you may be getting cloudy dirty water from it. Anyway, you want to clean out the hot water heater but have no ides how to do it.
Here are the steps you need to take to get the job done.

Before beginning it is a good idea to have a new pressure and temperature relief valve and a new drain valve on hand to use if needed. If you don not have a valve on your cold water line going into the hot water heater then you need to install one or have one installed.

First you need to shut off the gas or electric to your hot water heater, which ever way you heat your hot water.

Next hook up a hose to the bottom drain valve of the hot water heater. Run this hose outdoors or to a floor drain.

Open the drain valve to start the water flowing out of the tank. The relief valve will then need to be opened to allow air to go in to replace the water going out. If you do not allow air to go into the tank it will air lock and no water will flow out.

When the tank is empty you can then start the cleaning process. To do this you will need to open the cold water valve full on for a half minute or so. Then let the water and sediment drain out. Reopen the cold valve again and then drain. Repeat this process until you get clean clear water when you drain the water. Then you know that the tank is clean.

If the drain valve gets plugged when empting the water, you may need to use a wire to unplug it or even replace the drain valve.

The relief valve will often leak after opening it to allow the air in. It is best to replace it to be sure you will not have a leak.

Be careful of the hot water as you initially drain the tank.

Refill the tank and open a hot faucet to release all the air from the tank as you fill it.
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You now have a nice clean hot water heater again!!


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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

Adjusting water level on hot water heater


The water heater should be filled to the top at all times, there is no water level adjustment. The relief valve is probably failing and needs replaced.

Dec 27, 2012 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

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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...


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Problem1 is excessive electric bill.
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1 Answer

Pressure releif valve leaking


Hot water pressure relief valves serve two functions. The first is to remove high-pressure water from the hot water tank. The second function is to act as a high temperature valve to remove water that exceeds a predetermined point for the valve. Both of these relief settings are preset at the valve factory. Many pressure relief valves will come with a metal tag that identifies these release points. If you're attempting to remove the hot water heater pressure relief valve, pay careful attention to ensure that you replace with the correct valve.

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  • 3

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