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Troubleshooting AC expansion valve malfunction  

by Uneeb Khan

People often complains regarding expansion valve which fails to operate properly. This is a problem that occurs frequently in a wide variety of cases. Thankfully, the process is not all that challenging to go through. Having the services of 7 Days Aircon Servicing Pte Ltd can help pinpoint the problem and resolve it. will help us to go through how to modify an expansion valve. We additionally clarify how these parts work and why they need to have their settings modified appropriately.      

Important safety instructions:

When dealing with HVAC systems, safety should be your top priority. To protect yourself from receiving an electric shock, make sure that the HVAC system is turned off, and that it is unplugged from the electrical socket before you begin. Wear gloves to shield your hands from debris and some safety goggles to shield your eyes against any splashes of refrigerant or other liquid.

Stay in a well-ventilated place to prevent breathing in any potentially hazardous gases and make sure there is adequate ventilation. You should read the manual that came with your system in order to become familiar with any unique safety recommendations and warnings. If you follow these safety procedures, you will be able to operate more efficiently and without incident. It is recommended to have professionals at marvellous.sg perform the task as they are well-known in this field and know all safety precautions.

Identify expansion valve type:

Correctly identifying the expansion valve type dictates the adjustment procedure. Standard capillary and thermostatic expansion valves are the main types. Refer to the system’s manual to identify them. The kind of valve fitted should be specified in your HVAC system manual. Expansion Valve has a temperature-sensing bulb and is more complicated.      

The bulb controls refrigerant flow based on temperature. This bulb is usually fastened to the vacuum line which is close to the evaporator. If needed, seek professional advice, if the handbook or visual inspection cannot identify the valve type. Incorrect identification might cause system damage from inappropriate modifications.   

Identify the expansion valve’s location:

In order to make the necessary adjustments, it is essential to locate the expansion valve. To find the location of the valve, consult the user handbook for your HVAC system. An expansion valve is frequently found in close proximity to the evaporator coil.

Check for identifying marks or labels. Know whether it is a standard and thermostatic valve, knowing whether the valve is standard or thermostatic will alter how it should be adjusted. If you can’t identify a part, you can end up damaging the system instead of fixing it.

Opening the valve cover:

Once found, the expansion valve must be accessed. Take off any required cover. You might require taking off access panels to work on your HVAC system. Put a screwdriver and wrench to good use.   

It is advisable to store screws and dismantled pieces in a secure location to facilitate their subsequent reassembly. Systematically relocate any wires or components to create sufficient space for the valve, thereafter ensuring the region is free from any obstructions. Thorough pre-operative planning for valve accessibility will significantly facilitate the process of valve adjustment.

Modifying the valve’s position:

Valve adjustment requires care and precision. Adjustment can be made by following the steps outlined below .The valve may be marked with the location of the refrigerant flow controlling screw. While a wrench will work for the majority of basic valves, additional tools may be required for thermostatic valves.

Make small changes to slowly adjust the screw, and watch how the system reacts. The opposite is true for anticlockwise turns, they increase rather than decrease flow. This process requires patience and attention to guarantee the system performs at its best after improvements have been made.   

Verify and Complete:

After making modifications to the system, it is necessary to perform testing. Re-install any panels and coverings that you removed by making use of the wrenches and screwdrivers that you used before. The systems replenish energy after checking the performance of the cooling, as well as any noises or odd behavior.

When you see that the device is not functioning in the way that was anticipated, you should make the appropriate extra adjustments. After all of the necessary adjustments have been made, this last check will determine whether or not the system is operating as intended.

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