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…)
Gas Furnace Troubleshooting Techniques . Electronic ignition for gas furnaces are the modern way for furnaces to light the main burners. Furnace technology has evolved from the standing pilot gas ignition systems. These furnaces continue to be used today however there are less standing pilot furnaces used today than yesterday. When troubleshooting a system it is important to know which type of ignition system the furnace uses. (more…)
Home Humidity Problems - 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 into 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. (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. 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. When we first turn the furnace on we have a slight burning odor which comes from the system. (more…)
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.
Gas Furnace Components 3 - Gas furnace ignition controls vary from furnace manufacturer to furnace manufacturer. Some are proprietary and some are from an engineering company which specializes in gas furnace ignition controls. Honeywell being a major manufacturer of controls for HVAC also makes several gas furnace ignition controls. Gas furnace ignition controls have advanced by leaps and bounds over the last 20 years. The standard was standing pilot ignition. Solid state ignition controls are safer and more efficient than ignition controls of yesteryear. (more…)