Room temp is not where it should be before furnace shuts down
I have a Fridgidaire furnace, energy efficient, just installed, everything works but the room won't get up to temp before shutting down. It then does a purge cycle then after about five minutes the furnace turns back on blowing hot air
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Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.
If your living space is a single floor plan:
Turn the air conditioning on
Switch the furnace fan from auto to on.
Measure the temperature in each room.
Close the vents by about half in the cooler rooms
This will force more cool air into the warmer rooms.
Keep adjusting the vents until all the rooms have the same temp.
If your living space is on more than one level:
Turn on the air conditioning.
Switch the furnace fan from auto to on.
On the lowest level of the house close half of the vents that are the closest to the stairs.
This will force more cool air to the top floor where it is usually hotter.
Cool air will sink from the upper floors which will keep the area near the stairs cool.
Measure the temperature in all the rooms.
Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.
How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.
75000 to 85000 btu Or British thermal pound. Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound of water by one degree Fahrenheit at normal atmospheric pressure. The input capacity of an oil furnace is often stated using this unit of measure. The second number is the fuel efficiency rating, which is expressed as a percentage. This represents the amount of energy that gets converted to heat, with higher numbers being better. To determine the energy output in BTUs per hour, multiply the input BTU by the efficiency rating. For example, a furnace with 100,000 BTU of input and an efficiency rating of 89 produces 89,000 BTUs of output. One with an efficiency rating of 80 and the same input amount, produces only 80,000 BTUs of output.
If the drip pan switch is shutting the unit down , this means you have a condensate drain issue. Be careful about wiring around any safety switch, especially if the furnace is in the attic or on a second floor. You could have water dripping on the ceiling. The drip pan switch is a safety switch. The best thing to do would be to inspect the furnace. The pan is underneath it. Look inside the pan if you can. If it is full of water, use a shop vac and vac the water out of the pan. If there is no water, you can locate the safety switch, take the two wires loose from it and just wire them together. Caution: This will be wiring around the condensate safety switch that could cause water to leak on the ceiling or floor depending where the furnace is. Don't go too long without getting someone out to clean the condensate drain out.
Maintaining the lowest acceptable setting and leaving it at that temperature is the most economical way to run the unit. If the space is going to be unoccupied for an extended time (several hours), lower temperatures are okay. This minimizes the need to burst the heat to warm the space quicker. As I understand your unit, it minimizes electrical & gas consumption by basing the need on the temperature difference of actual space temperature and setpoint. The larger the gap, the more power and gas is consumed.
In summary, when the space is occupied, maintain a consistent temperature setting. When the space is unoccupied, maintain a lower setpoint.
Is there a heat source close to the thermostat, plug in transformer for a phone mabey, table lamp? If not then you have to have a bad thermostat. Any possible heat source from inside the wall? Will it shut off if you turn the system off? Turning power off to the furnace will shut everything down. If no heat source is driving up the indicated room temp, replace t'stat.
The furnace is likely over heating and the high temp. safety is shutting it down. It then cools and starts again. Things to check: Filter, Blower wheel and indoor A/C coil. If any or all are dirty you are limiting air flow and need to clean them.