Programmable Thermostat Wiring Diagrams – Installing a programmable thermostat is not unlike installing any other thermostat for your HVAC system. The key is to get the right thermostat for your HVAC system. And to make sure it is wired properly. (more…)
Troubleshooting Electronic Ignition Gas Furnace – Electronic ignition for gas furnaces is the modern way for furnaces to light the main burners on modern gas furnaces. Furnace technology has evolved from the standing pilot gas ignition systems that continue to be used today however there are less and less standing pilot furnaces used today. If your furnace is not working and you want to troubleshoot a heating system it is important to make sure you know which type of ignition system you have for your furnace.
Troubleshooting Electronic Ignition Gas Furnace
Additionally there are different types of systems and it is important to differentiate between the types of electronic systems before troubleshooting. We will break it all down for you in this series article: “Troubleshooting an Electronic Ignition Gas Furnace“.
Home Humidity Control | Why Its Important for Comfort & Health – Humidity is important to our home and health and it is important to maintain the correct humidity in our homes and workplaces for our health. What is humidity? Humidity is simply little water droplets in the air. Cold air is nearly saturated with these little water droplets because the contents of cold air allow the air to hold more water droplets or humidity. As air is heated it expands and holds less humidity.
Home Humidity Control | Why Its Important for Comfort & Health
When you heat the air in your home using a furnace, boiler, or heat pump this air expands and becomes drier. It is air with less humidity relatively speaking before it was heated and compared to the outside air. Air that is 30° F with 80% humidity will only be 15% humidity at 75° F. That is a big difference in humidity levels in the home after the air is heated. Granted, you are not heating air from 30° F to 75° F with your furnace. Depending on the set up of your thermostat and heating system you are most likely heating air that is 68° F to around 70° F to 75° F depending on the thermostat setting. The point is unless you have a source providing humidity to the air stream you are simply reheating dry air from inside the structure. There will be minimal infiltration humidity but the infiltration humidity will never be enough to bring the humidity levels up to healthy levels inside the structure for the inhabitants, plants, and furniture. (more…)
Home Humidity Problems – Is 60% Humidity in the Home Too High?
HIGH HUMIDITY 60 % +. Within the last month, I moved into a new house. It has dry walls and not plaster walls. The furnace and hot water tank were installed a week or so before we moved in to the house. Last week we determined that there is a humidity issue when the windows were sweating. We are trying to determine the source of the humidity. The contractor feels it may be the high efficiency furnace. I have a Lennox g61mp. The combustion air is pulled from within the un finished basement. Should the air be pulled from the outside? The gases are vented via PVC pipe which slopes back to the furnace.
Could the furnace be causing the humidity problem? If no, what else could be causing the humidity problem? The installer said it is not the furnace. (more…)
Honeywell Chronotherm Plus Thermostat – Trane XL19i Condenser – I have a Honeywell Chronotherm Plus 8624D running a Trane XL19i with a Trane XV90 – all installed new in new construction in 2003. Every winter, during the morning warm-up from 66 to 70, the burners stays on for approximately 1.5 hours at 70, then rises quickly to 73 before finally shutting off. The only way to interrupt the process is to turn the system to OFF at the thermostat. The system is on AUTO with the cooling set at 75 for the winter. I have swapped the thermostats (there are two sets in the house, this is the one in the attic for the second floor) with the same results. I have not swapped the thermostat circuit boards, but I can not see a reason to. The main floor is on the same schedule, but has never done this three degree burst. I have had three different contractors out, with corresponding charges for thermostat troubleshooting with no luck. Have you ever seen this? Any thoughts? Thanks! (more…)
Running New Thermostat Wire – It is possible that you may have to run a new thermostat wire from the air handler or furnace to the location where the existing thermostat is located. Running new thermostat wire can challenging even for professionals. If you must then following these instructions and helpful hints will hopefully help you in this endeavor. Pulling new wire should only be done as a last resort. The purpose of running new thermostat wire is necessary for certain reasons such as: (more…)
Two-Stage Gas Furnaces
2-stage gas furnaces are ever increasing in popularity among HVAC manufactures of gas furnaces. The product lines are ever increasing from single stage gas furnaces to two stage gas furnace. The reasoning is that the two-stage gas furnaces are more efficient than the single-stage furnaces. This is according to tests performed using the Department of Energy’s test guidelines in accordance with testing AFUE ratings for gas furnace. Is this true and is the test of gas furnaces correct in making the claim that the two-stage is more efficient than the single stage gas furnace? Before we make any claims to about the validity of the test we must first observe where the origin of the DOE guidelines for testing heating appliances come from. These test guidelines come from ASHRAE or the American Society of Heating, Refrigerating, and Air Conditioning Engineers. The current standards used to determine AFUE or Annual Fuel Utilization Efficiency was written and adopted by DOE in 1993 from multiple revisions dating back to 1982 where the origin of AFUE was made. The tests are applicable to gas furnaces/boilers, oil furnaces/boilers for determining AFUE.
Dangerous Cracked Heat Exchangers in Furnaces
Everyone wants heat when old man winter arrives in the fall. Many times we take it for granted that when the temperature falls all we have to do is go to the thermostat and turn the heat on. Usually, this is not a problem. We turn the thermostat on and the heat comes on. Whether we have boilers or a furnaces at the beginning of the season when we do first turn the furnace on we have a slight burning odor which comes from the system. Usually, many of us ignore this odor because it does eventually, usually, go away. This is normal and is usually dust particles that have accumulated on the furnace’s heat exchanger burning off. How many people actually think it is carbon monoxide and called a professional HVAC technician to make sure it is not a problem? There are some people who do call but a majority of people just ignore and enjoy the heat being produced by their furnace. After all, carbon monoxide is a colorless and odorless byproduct of burning fossil fuels so even if an unsafe condition existed with their furnace they would probably never know it. This is why it is important, before old man winter arrives, to call a professional, qualified furnace technician to inspect the furnace. First, the furnace technician can make sure that the furnace will start and second of all the furnace technician can make sure you will have a safely operating furnace. You want to make sure the furnace does not have a cracked heat exchanger and a good qualified HVAC technician will look for a furnace cracked heat exchanger. Heat safety is paramount so have your furnaces inspected immediately for a cracked heat exchanger. Have a safe heating season.
Trane 90 Plus High Efficiency Gas Furnace – This is a Trane High Efficiency gas furnace. It is also called a Trane 90 plus gas furnace because it offers efficiency ratings up to 90 percent plus. Gas or oil furnaces generally cannot achieve efficiency ratings over 95% because of impurities in the fuel including moisture. This is the reason why no fossil fuel furnace sold to the general public has a rating of more than 95% efficient.
Trane 90 Plus High Efficiency Gas Furnace – Fuel Quality
The biggest impurity in many fuels is moisture which is difficult to remove because it is in the distribution and storage places where the fuel is distributed and stored. If these impurities were removed from the fuels before they were introduced to the furnace the cost of the fuel would be much higher and the cost to benefit ratio would not be effective.
Boiler Stainless Steel Exhaust Flue Stack
This is a photo of a boiler stainless steel exhaust stack which is used for venting corrosive boiler combustion gases. As the flue gases leave the boiler they cool and depending on the dew point of the gas the gas will experience a change of state from a gas to liquid. This liquid is highly corrosive and only special flues like stainless steel vent can be used when this occurs to prevent premature failure of the boiler vent. There are many considerations to consider with a new installation of a heating system and the type of vent to be utilized to vent the gases from the boiler or furnace.