HVAC manufacturers are constantly researching methods to improve the efficiency of air conditioning systems for the sake of the homeowner. A device HVAC technicians started to install in the mid-2000’s to help with the efficiency of air conditioning systems, is the thermal expansion valve (TXV). Thermal expansion valves were a game changer for allowing a precise amount of refrigerant into the evaporator coil, instead of just one constant flow of refrigerant.

What Does a TXV Do?

The thermal expansion valve is connected to the smaller line of copper connected to your air handler, either on the inside or the outside of your air handler. It is located right in front of the evaporator coil so it can control the amount of refrigerant flowing into the evaporator coil. It does this by having a sensing bulb that measures the temperature of your suction line, which basically tells the thermal expansion valve how much it is to close, or to open, to allow the correct amount of refrigerant into the evaporator coil to cool your home properly, and efficiently.

Thermal expansion valves can either be screwed into the air conditioning system or will have to be brazed directly into the copper lines. In the past, before HVAC technicians were installing thermal expansions valves, a fixed orifice was inside the copper lines that allowed for one constant amount of refrigerant to flow into the evaporator coil. With the installation of a TXV into your evaporator coil, this allows for more refrigerant to flow through the evaporator coil, absorbing more heat, cooling your home faster, and your air conditioning system to run for shorter periods of time resulting in less electricity use. This can save homeowners money on their electricity bills.

TXV Operates with 410-A Refrigerant

When new products are introduced, there is always the possibility of problems that will need to be fixed. When thermal expansion valves were first installed into evaporator coils using 410-A refrigerant, HVAC technicians discovered that chemical reactions inside of the TXV led to tiny deposits forming on the inside which then led to the spring controlling the flow of refrigerant to stick in place. This problem would lead to the TXV either being all the way open or all the way closed. This incorrect amount of refrigerant flow will ultimately lead to the failure of your air conditioning system. After this discovery, TXV’s were redesigned to operate correctly with 410-A refrigerant. If your air conditioning system is operating correctly with a thermal expansion valve, your air conditioning system will operate more efficiently, and you’ll have more money in your pocket due to a lower electricity bill.

Integrity Comfort Solutions is constantly working to inform not only our clients but all homeowners of accessories and components for air conditioning systems to ensure that there are no surprises when it comes to Integrity Comfort Solutions HVAC technicians or other HVAC technicians repairing and maintaining AC equipment. If you have any questions about TXV’s or your air conditioning system, we’ll be happy to provide the information you need – call us at (281) 346-3095.