Replacement of refrigerant in a refrigerated container

We perform reefer container refills throughout Ukraine — in Kyiv, Odesa, Kharkiv, Dnipro, and other cities. We use only certified refrigerants R-134a and R-404a and strictly adhere to technological requirements.

When is a refrigerant refill needed for a cooling unit?

There are several signs indicating that a refrigerated container requires a refill:

• the container cannot maintain the set temperature;
• visible or confirmed refrigerant leakage;
• increased noise level during operation;
• significant increase in energy consumption;
• reduced cooling speed.

If you notice these signs, do not delay contacting specialists. Attempting to refill the system yourself may lead to equipment damage and increase future repair costs.

How refrigerant replacement is performed: step-by-step process

Refrigerant replacement in refrigerated containers is a multi-stage procedure requiring a professional approach, precision, and strict adherence to standards. GCS specialists work with two main types of refrigerants — R-134a and R-404A — and perform refilling in accordance with manufacturers’ technological recommendations. The main focus is proper system preparation, complete removal of moisture and air, and accurate control of the refrigerant amount. All work is performed using specialized equipment and is strictly regulated.

1. System preparation — evacuation and dehydration

Before refilling the cooling unit with refrigerant, we perform a complete system evacuation. The goal is to remove air and moisture to prevent corrosion and internal component degradation.

Main preparation stages:

1. Connecting a vacuum pump, vacuum gauge, and manifold gauge set.
2. Creating a deep vacuum down to 500 microns (0.67 mBar).
3. Holding the vacuum for 5–10 minutes to rule out leaks.
4. Optional nitrogen purging to prevent ice formation under high humidity.
5. Repeated evacuation after purging.

This thorough preparation eliminates the risk of acid formation in the system, prolongs equipment lifespan, and ensures stable operation of the unit.

2. Refrigerant charging: R-134a and R-404A

After successful preparation, the main phase begins — the refrigerant refill. The method depends on the type of refrigerant used in the system.

• R-134a (two-stage filling). Vapor charging through the suction line to about 2 bar (boiling temperature 0 °C) prevents freezing of residual moisture. Then the process switches to liquid charging through the liquid line until reaching the required amount. Constant weight monitoring is required based on the unit’s technical specifications.
• R-404A (liquid charging only). Filling is done in the liquid phase through the liquid port strictly with the unit turned off. Weight-based control prevents component separation since R-404A is a zeotropic mixture.

These actions ensure even cooling and stable operation of the refrigerated container under all conditions.

3. Final inspection and startup

After the refill, the system is turned on and undergoes a full inspection:

1. Leak diagnostics of all components (compressor, welds, condenser, capillary tube).
2. Checking the evaporator and suction line operation.
3. Adjusting the refrigerant level if necessary.
4. Running the system and sealing the service tube.

Only after these steps is the system considered fully ready for operation. This sequence minimizes failure risks and extends the service life of the cooling unit.

Refrigerant replacement in refrigerated containers must be performed exclusively by a qualified specialist. Attempting self-service without equipment can cause serious damage. Contact GCS to receive guaranteed results in full compliance with all standards.

Why choose GCS?

GCS is not only a container supplier but also a professional service provider throughout Ukraine. Our team includes qualified technicians ready to arrive at your site in Kyiv, Odesa, Kharkiv, Dnipro, and other cities. Our advantages:

• we perform refrigerant charging for reefer containers of any complexity;
• we use certified refrigerants only;
• we provide a warranty for all services;
• we offer maintenance services across Ukraine;
• we provide optimal price/quality ratio;
• we service both new and used units.

Our technicians undergo training and work with modern equipment, ensuring precision and safety at every stage.

Order reefer container refrigerant charging with a guarantee

If your container isn’t cooling properly, consumes too much energy, or requires maintenance, contact GCS. We will refill the cooling unit with refrigerant, perform a full diagnostic, and restore the equipment’s functionality.

Reefer container charging is performed strictly according to regulations and safety standards. You can order the service by phone or via the website form. GCS is your reliable partner for reefer container maintenance.

We work quickly, professionally, and across all of Ukraine.