Numerous factors determine how your heating system keeps you warm during cold winter months, furnace gas pressure being among them. If the pressure is too high or too low, it can throw a wrench in your heating system’s performance and cause safety issues if left unchecked.
If there’s one thing Georgia Air Conditioning & Heating Repair understands, it’s furnace repair in Richmond Hill, GA. Below, we’ll share the signs that the gas pressure in your furnace isn’t quite up to par.
What Is Furnace Gas Pressure?
Natural gas furnaces work by drawing fuel and air through the gas supply pipe. First, the thermostat initiates the cycle startup, which opens the gas valve. As fuel moves through the valve from the supply pipe, it enters the combustion chamber.
Once the combustion chamber draws enough gas, the valve closes again. Furnace gas pressure measures how much gas can make it to the combustion chamber at the start of a cycle. Low and high pressure can affect each cycle’s heating efficiency.
Even though high and low-pressure levels are opposite problems, they both cause similar issues:
- Soot buildup: A little soot is normal and indicative of complete combustion, but excessive buildup means the combustion process doesn’t come full circle.
- Expensive utility bills: High gas pressure uses too much fuel, while low gas pressure forces your furnace to work harder during a cycle’s startup.
- Carbon monoxide release: Since high and low pressure can cause partial combustion, they can also cause the furnace to leak carbon monoxide, which triggers CO alarms and can have lethal consequences.
While the pressure differences share the above-listed problems, they also diverge in their symptoms. Let’s explore those differences more in depth below.
How Can You Tell Your Gas Pressure Is Too Low in Richmond Hill, Georgia?
Low furnace gas pressure might occur because of:
- Gas meter problems
- Leaky or blocked supply lines
- Tight gas valve
- Malfunctioning regulators
Your furnace has too little fuel combined with too much air to initiate and sustain a full heating cycle. Take a look at your furnace to see if the below issues crop up.
Small, Weak Pilot Flame
The pilot light should appear steady and blue in color. It should look proportional to the component that contains it. Gas line leaks or blockages will change its appearance.
You will observe a smaller, pale-yellow flame that flickers. This flame doesn’t have the heat or intensity to initiate a stable heating cycle.
Shortened Heating Cycles
When the furnace in your Richmond Hill building begins cycling, it has trouble maintaining a sustained, productive heating cycle. It will start up like it normally would, but may shut off without warning. It can’t access enough fuel to sustain the full 15 to 20-minute operation.
Sounds That Interrupt the Heating Cycle
If cycles do continue at normal intervals, strange, sudden noises will punctuate them. After a normal startup, you might hear sharp whistling or repeated clicking sounds. The whistling comes from excessive air entering the chamber, while clicking indicates repeated attempts to draw fuel and ignite the pilot flame.
You could have furnace gas valve issues on your hands, like a tight or clogged valve. An HVAC technician can likely fix these issues during a maintenance tune-up in Richmond Hill, Georgia.
What About High Pressure?
High furnace gas pressure can also come from a gas valve malfunction or maladjusted regulators. However, you have too much fuel entering the chamber instead of too little. The problem causes similar but opposite issues.
Oversized, Volatile Pilot Flames
If you inspect the pilot light, you might discover that the flame looks too tall or moves aggressively. It might also look orange instead of pale yellow. Irregular pilot flames are often the first indicators of significant furnace safety concerns.
Longer Heating Cycles
We mentioned above that furnaces need a balanced mix of air and fuel for productive combustion. Too much fuel creates excessive heat that the furnace must somehow release. This leads to long cycling.
Loud Startup Noises
While low pressure makes a racket during the cycle, high pressure causes disruptive cycle initiations. You’ll hear sustained roaring or whooshing noises as combustion begins because the excess fuel creates a hotter, more volatile internal environment. You need a Richmond Hill HVAC technician to perform furnace troubleshooting.
Trust Georgia Air Conditioning & Heating Repair To Tune Up Your Furnace in Richmond Hill, Georgia
Furnace gas pressure dictates how much fuel enters the combustion chamber. An excessive or inadequate amount causes problems, much like running a furnace without a filter. Contact Georgia Air Conditioning & Heating Repair about furnace troubles in Richmond Hill, Georgia.