A gas furnace can have coils, particularly when it is part of a split HVAC system that includes air conditioning. These coils, known as evaporator coils or indoor coils, play a crucial role in the heating and cooling process.
Purpose and Function of Coils in Gas Furnaces
What is the purpose of coils in a gas furnace?
The primary purpose of the coils in a gas furnace is to act as a heat exchanger. During the heating season, the coil absorbs the heat generated by the gas furnace, allowing the blower to distribute this warm air through the ductwork. In cooling mode, the coil functions as part of the air conditioning system, transferring heat from the indoor air to the refrigerant.
How do the coils work in a gas furnace?
The coils in a gas furnace are typically located either within the furnace assembly or in a separate casing near the furnace. When the furnace is in heating mode, the coil absorbs the heat generated by the gas burners, and the blower then circulates this warm air through the ductwork and into the living spaces. In cooling mode, the coil acts as the evaporator, allowing the refrigerant to absorb heat from the indoor air, which is then expelled outside by the outdoor condenser unit.
Installation of Furnace Coils
What is the process of installing furnace coils?
The installation of furnace coils typically involves the following steps:
- Matching the Coil: Ensure the coil is compatible with the gas furnace and the overall HVAC system by selecting a coil that matches the furnace’s capacity and configuration.
- Location: The coil is usually installed in the furnace assembly or in its own casing near the furnace.
- Tools and Materials: Required tools include wrenches, screwdrivers, and possibly specialized tools for connecting refrigerant lines. Materials may include the coil itself, mounting hardware, and possibly additional ductwork or electrical connections.
- Installation Process:
- Disconnect power to the HVAC system.
- Secure the coil in its designated location, ensuring proper airflow and connection to the furnace and ductwork.
- Connect the refrigerant lines to the coil, following manufacturer instructions.
- Connect any necessary electrical connections to the coil and furnace.
- Turn on the power and test the system to ensure proper operation.
Common Furnace Coil Problems
What are some common problems with furnace coils?
- Dirty Coils:
- Symptoms: Reduced energy efficiency, overheating, and system shutdowns.
- Solution: Regular cleaning, ideally during seasonal tune-ups.
- Mold and Mildew:
- Symptoms: Poor indoor air quality, visible mold or mildew.
- Solution: Ensure proper drainage and cleaning of the coil to prevent moisture buildup.
- Leaks or Damage:
- Symptoms: Refrigerant leaks, reduced system performance.
- Solution: Inspect and repair or replace the coil as necessary.
Furnace Coil Cleaning
How often should furnace coils be cleaned?
Furnace coils should be cleaned annually, typically during the fall before the heating season. Regular cleaning helps maintain the efficiency and performance of the HVAC system.
What is the best way to clean furnace coils?
The best way to clean furnace coils is to hire a professional HVAC technician. Attempting to clean the coils yourself can be challenging and risky, as the coils are often difficult to access and improper cleaning can cause damage or void the manufacturer’s warranty.
Feasibility of DIY Installation
Can homeowners install or clean furnace coils themselves?
It is generally not recommended for homeowners to attempt to install or clean furnace coils themselves. Proper installation and maintenance require specialized training and tools, and there are significant safety risks involved, such as electrical shock and refrigerant exposure. Attempting DIY tasks can also void the manufacturer’s warranty. It is advisable to hire a professional HVAC technician for these tasks to ensure the system is properly installed, maintained, and operating safely.
Reference:
1. King Heating Blog: What is the furnace coil, and what are things that can go wrong with it?
2. Trane Commercial HVAC: Gas Furnaces and Indoor Coils
3. Budget Heating & Air Conditioning: Home Gas Furnace Heating Systems
