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How to adjust thermostat on a firebird boiler

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It is a oil boiler had to call a plumber a friend who fixed it

Posted on Aug 28, 2008

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I have installed a Honeywell DT92E which keeps turning off the boiler before room temperature is reached


Hello David, I don't know if you installed this thermostsat or had someone else to install it. If you don't have the manual for your DT92E thermostat, I found a PDF file online that coveres both DT92A and DT92A. If you scoll down the PDF file after opening it, towards the bottom, you will see how to adjust the boiler timing. Maybe the timing is still in default mode and needs to be adjusted for a longer burn time? Hope this helps out.

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Symptoms bad thermostat


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Boiler runs to long


Adjust the high limit on the control.

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Baxi boiler


Make sure the gas inlet & outlet pressures are correct (manometer) & that the primary air mixture is adjusted correctly. Check to make sure you have 1 square inch of outside air for combustion per 2000 BTU's rating on the boiler.

Nov 24, 2013 | Heating & Cooling

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

2 Answers

I have just had a new boiler fitted and wanted to run the thermostat (honeywell cm921) on auto, the electrician set the timer to come on at 1 & off at 2 disabled at 3 & 4 and on again at 5 and off...


Complicated because I need more info....but in General a Boiler should not be on a Programmable Thermostat as it takes too long to heat etc...do you have Radiators in your house???Or ductwork for heat???It will make a difference...if you put the boiler on a program it may come on anyway as some boilers maintain there own internal temperature regardless of the thermostat.....if you want to run it on a program adjust the temperatures so there is only about a 2 degree swing....70...down to 68....back to 70.....etc...there should also be a switch in the thermostat to set for Boiler...or Electric heat...make sure that switch is on...otherwise its difficult to give you a more conclusive answer

Nov 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Need to wire a honeywell RTH7400D thermostat to 3 wire hot water


Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Oct 18, 2009 | Honeywell Electronic Programmable...

1 Answer

Chronotherm Three thermostat vs Buderus Logamatic Computer.


The outdoor thermostat senses the the temp of the outside air, and adjust the boiler water temp according to what it knows is best. The reason that the boiler is running longer is the old boiler used to be constantly sending 180ish degree water to the baseboard, now that water may only be 140ish degrees. The idea behind this is to reduce off cycle heat loss, as the greater the temp difference between the air temp and water temp, the quicker you loss heat. The theory in boiler run time is this, the less times it starts and stops, and the long run times will give you the best efficiency. Hope this answers you questions.

Sep 28, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

SYMPTOMS: BOILER SEEMS TO IGNITE AND FIRE UP EVEN WITH BOTH THE HEATING AND HOT WATER OFF. DO YOU THINK IT IS A BYPASS VALVE ADJUSTMENT PROBLEM? I HAVE A DU145, HOW DO I ADJUST IT? HARISH LATHIA


Some boilers must maintain temperature for proper operation. Not sure what a DU145 is?! Give us a brand name and a model number and any additional information you can such as thermostat setting, Aquastat setting (if you can) etc...

Jun 08, 2008 | Honeywell Heating & Cooling

1 Answer

How can I adjust my boiler ? the water is only at 140 degres


The thermostat may have gone bad on your espresso machine.

Saeco parts and cleaning supplies:

www.CeriniCoffee.com

Apr 19, 2007 | Saeco Classico Espresso Machine

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