Aircon Gas Top Up

Many aircon users have heard the term “refrigerant” but don’t fully understand its crucial role in keeping the system running smoothly. Often, signs of low refrigerant levels go unnoticed until the aircon stops cooling altogether.

Low refrigerant levels can result from various issues such as leaks, faulty installation, or poor-quality copper piping. Over time and with regular usage, refrigerant levels naturally drop, impacting your aircon’s performance.
we diagnose the root cause of refrigerant loss and perform safe, professional gas top-ups to restore your unit’s cooling power.

Why Your Aircon Needs a Gas Top-Up

When refrigerant levels fall below optimal, topping up is necessary to maintain cooling efficiency. Common reasons for refrigerant depletion include:

•  Frequent or heavy usage


•  Leakage in the system


•  Incorrect installation


•  Poor-quality copper piping


•  Extended distance between split aircon units

Leakage is the most common and serious cause of refrigerant loss. Besides reducing cooling efficiency, leaks can harm both your health and the environment.

Signs of Low Refrigerant Levels

•  Poor cooling or insufficient cold air


•  Frost or ice buildup on the evaporator coils


•  Unusual hissing or bubbling noises


•  Higher electricity bills than usual


•  Aircon unit fails to start or frequently shuts down

Our Aircon Gas Top-Up Process

Many people think topping up aircon gas is a simple task, but it’s more complex than it seems. A skilled technician with the right tools is essential—not only to refill the gas properly but also to detect and fix any leaks.

The technician will first perform a thorough inspection, checking air filters, electrical cables, and the compressor for any faults or leaks. Any detected leakage must be repaired before proceeding with the gas refill.

Here are the typical steps involved in the gas top-up process:

•  Locate the suction and discharge lines on the outdoor unit. The suction line is where the gas refill is done.


•  Unscrew the bolt on the suction line and connect the aircon’s manifold gauge.


•  Attach the refrigerant tank’s hose to the manifold gauge and prepare to pump the gas.


•  Turn on the aircon and wait for the compressor to start running.


•  Once the compressor is running, the technician will open the refrigerant tank valve for 4 seconds, then close it for 2 seconds repeatedly. This slow pumping protects the compressor from damage.


•  Monitor the pressure carefully until it reaches the correct level, then close the manifold valve and refrigerant tank knob.


•  Remove the hose from the suction line and securely screw back the bolt.

After topping up the gas, the technician will conduct final checks and troubleshoot the system to ensure your aircon is running efficiently.

Why Choose usServices for Your Gas Top-Up?

Gas top-up is more than just refilling; it demands expert knowledge of refrigerant types, leak detection, and safe handling. Refrigerants are colourless and odorless, making leaks difficult to spot without proper tools.

At usServices, we pride ourselves on identifying and fixing the root cause of refrigerant loss. Along with gas top-up, we offer comprehensive aircon servicing, repairs, maintenance, and chemical cleaning. With years of experience and proven expertise, you can trust us to keep your air conditioning running efficiently and reliably.

Book an appointment with us today and experience professional service you can count on.