Thermostatic expansion valves are normally fairly dependable parts of a refrigeration system, but they can develop issues like any other part of the system and require troubleshooting. For the best solution of expansion valve, pay a visit to https://www.airconservicing.org/.
In order to reduce the problems of valve, it is crucial for service technicians and homeowners to have a thorough understanding of thermal expansion valves and how they work. To find more solutions, go to http://www.marvellous.sg/.
- Double-check the thermal expansion valve correction:
For optimal performance, a refrigeration system of AC relies on a thermostatic expansion valve (TEV) that has been properly adjusted. TEVs usually have their default location positioned in the middle of the stem. To fine-tune it, turn the stem counterclockwise by a half turn to a full turn every 15 minutes until it reaches the desired level of brightness. With this knob, you can regulate the superheat. System performance is maximized with the right amount of superheat.
- Verify the position of the sensor bulb:
The TEV’s sensor bulb needs to be attached to a spot on the suction line that is both spotless and straight. For precise temperature readings, a specific placement for the bulb is required. The bulb should be installed at either 4 or 8 o’clock on the horizontal axis for suction lines that are 7/8 inches or greater. On shorter lines, you have more leeway, but you still want to keep the bulb away from the very bottom, where oil might diminish its sensitivity. In systems with several evaporators, make sure the sensing bulb is not impacted by the flow from one valve to another.
- Make sure there is no moisture present:
Problems can arise at the expansion valve if there is moisture in the system. The flow rate is reduced if water or oil and water mixture freezes in the valve. Moisture problems can arise even if the system has been shut down for a long time. The release of moisture due to rising temperatures can be avoided with regular condenser repair and leak detection. When a condenser has a gradual leak, a filthy coil, or a broken fan motor, the temperature of the liquid in the valve will rise.
- Make sure the liquid is non-volatile:
Incorrect TXV adjustment can be the cause of vapor in the liquid path in some cases. The TXV requires a sub-cooled, non-volatile liquid to be supplied. The evaporator can overflow if the condensation temperature is too low. A sight glass installed before the TXV in the liquid line can ensure that only liquid refrigerant is being supplied.
- Make sure the valve body is clean of any debris:
Contaminants might impede the proper functioning of a system. Some of these materials can pass through conventional strainers and clog the TEV’s port. Turn off the pumps, take apart the TEV, and clean it thoroughly. If there is concern that contaminants may have made it past the main liquid line filter and into the restricted TEV, a filter-drier should be installed in front of the TEV.
- Set the valve appropriately:
For detailed information on the valve, check the manufacturer’s specs. Valve settings are recommended in these documents based on system type and size. The valve should be adjusted to fit this position. This may require adjusting a spring or rotating a screw, according to the type of valves you have.
There have been reports of TXVs being flawed due to production issues. You’ll need to consult the valve’s product description for this information. The valve must be replaced if it does not conform to these requirements.
- Make sure the TXV is working properly by testing the system:
When you have finished servicing and replacing components, start the vehicle and activate the air conditioning. The airflow should remain constant and there shouldn’t be any strange noises coming from the system if it’s functioning properly.
- Regular maintenance:
Preventive measures, such as routine maintenance, are usually the most effective. Maintaining your refrigeration system on a regular basis will allow you to catch any problems with the expansion valve before they become catastrophic. Maintaining a fit HVAC system involves more than just changing filters and cleaning coils. Regular expert maintenance is recommended to check the expansion valve and other parts for proper operation.
