Thermal Expansion Valve: What a TXV?

Thermostatic Expansion Valve in Mooresville, NC

In recent years, manufacturers of air conditioning systems have been working on various technologies to improve energy efficiency. A thermal expansion valve (TXV) is a device in the compressor that regulates refrigerant flow. Here is an outline of how a TXV works and how it can boost efficiency for your HVAC system.

How the TXV Works

The thermal expansion valve controls the amount of refrigerant that flows through the evaporator. The TXV regulates refrigerant flow depending on the evaporator’s temperature and pressure, commonly known as “superheat.”

Managing the refrigerant’s flow into the evaporator coils is critical for optimizing your air conditioner efficiency. It prevents the excess fluid from flowing back into the compressor. The phenomenon is referred to as a floodback and is a prevalent issue in HVAC systems.

HVAC Systems and Floodbacks

Typically, the compressor receives the refrigerant in vapor form. When some of it flows back as a liquid, it can cause a problem with your HVAC system. Sometimes the issue can be mistaken for compressor failure.

When your air conditioning system has a floodback, you may notice a reduction in its efficiency. Higher levels of refrigerant will force your AC unit to overwork. Since the compressor cannot handle the pressure, your equipment may eventually fail. If you suspect your unit is losing its efficiency, contact Putnam Mechanical in Frederick.

A floodback can also limit the distribution of lubrication to parts of the system. Most units integrate the lubrication and the refrigerant system, which is pumped by the compressor. When the compressor fails, some components will overheat or break down faster.

What Is the Cause of Compressor Floodback?

One of the reasons your AC may have a floodback is the accumulation of frost on the unit. Ice on the evaporator coil in summer is not unusual. Sometimes it is an issue with airflow and can be solved by replacing the filter or removing airflow blockages.

An incorrect defrost cycle can trigger floodback issues. If the ice takes time to thaw after a defrost cycle, your system might be faulty. A prompt repair service can prevent further damage to your system.

A flood back may also be due to an overcharge of refrigerant in the system. During maintenance, the refrigerant levels are restored to the manufacturer’s standards. If the levels are too high, the compressor will overwork to push the fluid through the system.

Another cause of the problem could be with some of the components, such as the expansion valve. A technician will assess the condition of the valve and recommend an adjustment or replacement.

How TXVs Are Beneficial for HVAC Systems

Thermal expansion valves can cut down the high running costs of your HVAC system. They prevent refrigerant floodback, which can shorten the lifespan of your air conditioning unit. Frequent incidences of a refrigerant floodback can damage critical internal components of the compressor.

A TXV can also minimize the adverse effects of overcharging the refrigerant. If the coolant in the system exceeds the recommended level, a thermal expansion valve can control the pressure and temperature. It regulates the flow of refrigerant more precisely and can minimize damage to your system.

How to Keep Your AC Efficient

Even though a thermal expansion valve can minimize damage and boost the system’s efficiency, it is just one factor. Other factors, such as the maintenance of your equipment, will determine the performance of your air conditioner.

So, it is always advisable to schedule regular maintenance of your AC at least once a year. Putnam Mechanical‘s maintenance team in Frederick can tune up components to restore the performance of your system. A tune-up often involves cleaning critical components such as the evaporator coil to prevent frost and other issues.

Our technicians have the experience to spot problems within your AC system before they become complicated repair issues. If your AC needs an expansion valve, a technician has the tools to check the refrigerant charge and recommend lasting solutions.

Additionally, it is always wise to seek repairs promptly whenever you detect problems with your HVAC system. A fault with the TXV could damage other parts of your AC.

Certified technicians can also determine if you need a thermal expansion valve. Sometimes the issue could be your ductwork limiting airflow. By hiring a professional, you will be saving instead of buying unnecessary components.

Putnam Mechanical is a Lennox Premier Dealer and Rheem Pro Partner in Frederick. We can fix virtually all models and makes of HVAC systems. Our highly qualified staff has been a recipient of the Best of Home Advisor Award in 2019. We also offer 24/7 emergency repairs in Frederick. Talk to our staff to book an appointment today.

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