Connecting the collector to the refrigerator: a step-by-step guide with diagrams and tips

Connecting the collector to the refrigerator is a task that is faced owners when upgrading the cooling system, replacing a compressor or installing additional circuits. Despite the apparent complexity, the procedure is quite doable with your own hands if you strictly follow the technical requirements and observe safety measures. In this article we will analyze all stages of connection —from choosing components to testing the system—and also consider typical errors that can lead to equipment failure.

The manifold in the refrigeration system acts as a distribution unit, ensuring uniform distribution of the refrigerant throughout the circuits. Its connection is required in cases where the standard highway cannot cope with the load (for example, when adding a second camera) or when repair after a freon leak. It is important to understand that improper installation can cause uneven coolingincreased wear on the compressor or even equipment failure. Therefore, before starting work, be sure to study the diagram of your refrigerator model - there may be nuances in the arrangement of pipes and fittings. Samsung, LG And Indesit There may be nuances in the arrangement of pipes and fittings.

If you have never worked with refrigeration equipment, we recommend that you first practice on unnecessary tubes or invite an assistant. In the process you will need special tools (rolling, pipe cutter, pressure gauge), as well as consumables - freon, solder, sealing tape. Do not forget that working with refrigerants requires compliance with safety precautions: the room must be well ventilated, and your hands must be protected with gloves.

When is it necessary to connect the manifold to the refrigerator?

The manifold is not a standard element of household refrigerators - its installation is justified only in specific cases. Here are the most common scenarios in which you cannot do without it:

• 🔧 Upgrading the cooling system: adding a second or third chamber (for example, when converting a single-chamber refrigerator into a two-chamber one).
• 🔄 Replacing the compressor to a more powerful one, requiring distribution of the refrigerant over several circuits.
• 💧 Eliminating freon leaks at the branching point of the tubes (the manifold allows you to reliably seal the connections).
• ❄️ Uneven cooling: if one of the chambers freezes more than the other due to improper distribution of the refrigerant.
• 🔌 Connecting an additional evaporator (for example, for a system No Frost or freshness zone).

It is important to distinguish the collector from a conventional tee. The manifold provides uniform pressure distribution all outlet pipes, while the tee simply branches the flow, which can lead to an imbalance in the operation of the system. For example, in refrigerators Atlant with two compressors, the manifold is often installed at the factory, and in budget models Biryusa you have to add it yourself during an upgrade.

Before making a decision about installation, check whether it is easier to solve the problem in another way. For example, if the refrigerator does not freeze well, it may be enough to diagnose the compressor or to top up the freon. Connecting a manifold is irreversible design changewhich may void your warranty (if the equipment is under warranty service).

The necessary tools and materials

To connect the collector You will need specialized tools, some of which can be rented at service centers. Below is a complete list indicating where you can save money and what you shouldn’t.

In addition to tools, prepare consumables:

• 🔹 Collector (choose with the number of outputs corresponding to the number of circuits).
• 🔹 Copper tubes with a diameter of 6–10 mm (depending on the refrigerator model).
• 🔹 Solder and flux for soldering (for example, Castolin 192 FB).
• 🔹 Sealing tape or sealant for threaded connections.
• 🔹 Nitrogen (for purging the system before refueling).

⚠️ Attention: If you work with freon R600a (isobutane), remember that it It is explosive! It is better to entrust filling with such refrigerant to professionals. Also, avoid using open fire near the cylinder.

Preparing the refrigerator for connection

Before starting work, the refrigerator must be completely prepared. This stage is often skipped, which leads to moisture or debris getting into the system, and subsequently to corrosion or clogging of the capillary tube.

Step 1. Shutdown and defrosting.

• 🔌 Unplug the refrigerator and let it thaw for 12-24 hours.
• ❄️ Remove all ice and moisture from the internal surfaces (you can use a hair dryer).
• 🧹 Vacuum the back wall thoroughly to prevent dust from getting into open tubes.

Step 2. Removing the rear panel.

Remove the protective cover of the compressor and the back panel of the refrigerator. In most models (Samsung RL-34, LG GA-B489) it is attached with screws or latches. Be careful - electrical wires and tubes run behind the panel. refrigerant. Do not pull the wiresso as not to tear off the terminals!

Step 3. Bleeding the freon.

If there is refrigerant left in the system, it must be vented. this:

1. Wear safety glasses and gloves.
2. Connect the gauge manifold to the service port (usually located on the compressor).
3. Slowly open the valve to allow the freon to escape to the atmosphere (do this outdoors or in a well-ventilated area room!).

⚠️ Attention: Bleeding freon without special equipment (for example, through a puncture of the tube) is dangerous! Refrigerant under pressure can cause frostbite to the skin.

Step 4. Purge the system with nitrogen.

After bleeding the freon, moisture remains in the tubes, which, when mixed with the refrigerant, forms an acid that corrodes copper. To avoid this:

1. Connect a nitrogen cylinder to the service port through the reducer.
2. Purge the system for 10–15 minutes (pressure 6–8 bar).
3. Close the valve and leave the system under pressure for 1–2 hours to check tightness.

Selecting and installing a manifold: connection diagrams

Manifolds for refrigerators are of two types:

• 🔄 Distribution - evenly divide the refrigerant flow between circuits (used in systems with one compressor).
• 🔀 Reverse - collect refrigerant from several evaporators into one line (used in multi-compressor systems).

For household refrigerators most often used distribution manifolds with 2–3 outputs. When choosing, pay attention to:

• 🔹 Inlet/outlet diameter (must match the diameter of the tubes of your refrigerator).
• 🔹 Material (preferably copper or brass - they are resistant to corrosion).
• 🔹 Presence of service port for refilling freon.

Below are two diagrams for connecting the collector:

Scheme 1. Connection to one compressor (two-chamber refrigerator).

Compressor → Condenser → Collector → Freezer evaporator
↘
Refrigerator evaporator

Scheme 2. Connection to two compressors (system Dual Cooling).

Compressor 1 → Condenser 1 → Freezer evaporator
Compressor 2 → Condenser 2 → Collector → fridge compartment evaporator

↘
Additional circuit (freshness zone)

In models with No Frost (for example Bosch KAN92VI30), the collector is installed in front of the evaporator to evenly distribute refrigerant through the blowing channels. In refrigerators with a drip system (Indesit DF 4180) it is mounted closer to the compressor.

⚠️ Attention: If you connect the collector to a system with with an inverter compressor, make sure that the collector model is designed for variable pressure. Some budget collectors may not withstand the load and burst.

How to check the compatibility of the collector with the compressor?

Check the compressor's passport for the maximum operating pressure (for example, for Embraco EGX 90 this is 25 bar). Compare with the characteristics of the collector - its limit should be 20-30% higher. Also pay attention to the thread diameter: most household refrigerators use metric thread M6 or M8.

Step-by-step instructions for connecting the collector

Now let's move on to the most important stage - installation of the collector. Follow the instructions strictly step by step to avoid mistakes.

Step 1. Marking and cutting the tubes.

• 📏 Measure the distance between the compressor and the installation site of the collector. The tubes should go without tension, but also without sagging.
• ✂️ Cut the tubes with a pipe cutter (do not use a hacksaw - it leaves burrs!).
• 🔍 Clean the edges with a file and remove the shavings.

Step 2. Rolling the tubes.

Using by rolling, form sockets at the ends of the tubes (flare). The opening angle should be 45°, and the depth should be 1–2 mm. Check that the tube fits tightly onto the manifold fitting without play.

Step 3. Soldering the connections.

1. Apply flux to the socket and fitting. collector.
2. Heat the joint with a torch to the melting temperature of the solder (about 250–300°C).
3. Apply the solder to the joint - it should spread evenly along the seam. Do not overheat the copper, otherwise it will lose strength!

Step. 4. Installation of the manifold.

• 🔧 Secure the manifold to the rear panel of the refrigerator using clamps or brackets. It should not hang on the tubes!
• 🔄 Connect the inlet pipe of the manifold to the condenser, and the outlet pipe to the evaporators.
• 🔒 Tighten the threaded connections with a torque wrench (tightening torque - 1.5–2 Nm).

Step 5. Check for tightness.

After installation, check the system for leaks:

1. Connect the pressure gauge and pump nitrogen to a pressure of 10–12 bar.
2. Apply a soap solution to all connections. If bubbles appear, there is a leak.
3. Eliminate defects by soldering or tightening fittings.

Freon charging and system testing

After installing the manifold, the system must be charged with refrigerant. This stage requires special care, as incorrect charging can occur. lead to compressor overheating or insufficient cooling.

Step 1. Evacuate the system.

• 🔄 Connect the vacuum pump to the service port.
• ⏱ Pump out the air for 20-30 minutes (the pressure should drop to -1 bar).
• 🔒 Close the valve and leave the system under vacuum for 10 minutes to check the tightness.

Step 2. Refilling freon.

1. Connect the freon cylinder to the pressure gauge manifold.
2. Open the cylinder valve and slowly charge the refrigerant, monitoring the pressure using the pressure gauge.
3. For R134a working pressure on the low pressure side is - 0.5-1 bar, at high - 8-12 bar.
4. Refill in portions, allowing the system to stabilize.

Step 3. Check the operation of the refrigerator.

• 🔌 Turn on the refrigerator and let it run for 1-2 hours.
• ❄️ Check the temperature in the chambers (in the freezer it should be -18°C, in the refrigerator +4°C).
• 👂 Listen to the sound of the compressor - it should work smoothly, without any extraneous knocks.
• 🔍 Inspect the manifold and tubes for freezing (this may indicate a leak or incorrect filling).

⚠️ Attention: If after filling the compressor runs without stopping or the chambers do not cool, air may have entered the system. In this case, you need to repeat the evacuation and filling.

Typical mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when connecting the collector. Here are the most common ones and ways to prevent them:

Error	Consequences	How to avoid
Insufficient soldering of connections	Freon leakage after 1-2 months	Use high-quality flux and heat the joint evenly
Overheating of tubes during soldering	Weakening of copper, risk of cracks	Control the burner temperature (not higher than 300°C)
Wrong choice of collector	Uneven cooling of chambers	Check compatibility by pressure and diameter
Refilling the wrong freon	Compressor breakdown or poor cooling	Use only refrigerant indicated on the nameplate
Lack of evacuation	Moisture ingress, pipe corrosion	Evacuate the system for at least 20 minutes

Another common problem is freezing of the collector. This happens if:

• 🔹 The refrigerant is charged in excess.
• 🔹 The collector is installed too close to the evaporator.
• 🔹 In the system air or moisture remains.

If freezing appears, turn off the refrigerator, bleed off the freon and repeat evacuation. When refilling, reduce the amount of refrigerant by 10-15% of the recommended amount.

What to do if the refrigerator does not freeze after connecting the collector?

1. is the compressor turned on (it should hum and heat up).

2. Measure the pressure with a control pressure gauge: on the suction side it should be 0.3–0.7 bar, on the discharge side - 8–15 bar.

3. If the pressure is low, there may be a leak or undercharging of freon.

4. If the pressure is high, there is probably a blockage in the capillary tube or an excess of refrigerant.

Diagnostics of faults after connection

If after installing the manifold the refrigerator does not work correctly, it is necessary to carry out diagnostics:

1. The compressor runs without stopping.

Possible reasons:

• 🔹 Lack of freon (pressure on the suction side is below 0.3 bar).
• 🔹 Leakage at the soldering point or threaded connection.
• 🔹 Clogged capillary tubes (discharge pressure above 15 bar).

2. One of the chambers is not cooling.

This is a typical problem when the refrigerant is not distributed correctly. Check:

• 🔹 Whether all outlet pipes of the collector are heated evenly (they should be the same temperature).
• 🔹 Are there any kinks in the tubes going to the evaporator of the problem chamber.
• 🔹 Is the cross-section of the tubes selected correctly? (tubes that are too narrow create excess resistance).

3. Extraneous noise (knock, hum).

Possible reasons:

• 🔹 Vibration of the collector (insufficiently rigid mounting).
• 🔹 Hydraulic shock due to moisture entering the system.
• 🔹 Compressor wear (if noise appears after refilling, the refrigerant may be incompatible with the oil in the compressor).

For accurate diagnosis, use a pressure manifold and a thermometer. Measure the discharge temperature (should be 20-30°C above the condensing temperature) and suction temperature (should be close to the evaporation temperature). If the parameters are outside the norm, contact a specialist.

FAQ: Frequently asked questions about connecting the manifold

❓ Is it possible to connect the manifold to a refrigerator with an inverter compressor?

Yes, but you need to choose a manifold designed for variable pressure (usually these are models marked Inverter Ready). Also make sure that the refrigerant is compatible with the oil in the compressor (for example, polyester oil is used). R600a polyester oil is used).

❓ How much freon is needed for refilling after installing the manifold?

The amount of freon depends on the length of the pipes and the volume of the system. On average, household refrigerators require 60–120 grams. The exact weight is indicated on the compressor nameplate or in the refrigerator passport. When adding a collector, add 10–15 grams for every meter of new pipes.

❓ How to check that the collector is working correctly?

After filling with freon, check:

1. The temperature at the outlet pipes of the collector - it should be the same (permissible difference is 2-3°C).
2. Pressure on the pressure gauge (on the suction side - 0.3-0.7 bar, discharge - 8-12 bar).
3. Cooling in the chambers (the freezer should reach -18°C in 2-3 hours).

❓ Is it possible to do without nitrogen when purging the system?

Technically yes, but it is risky. Nitrogen removes moisture, which, when mixed with freon, forms an acid that corrodes the tubes. If nitrogen is not available, use dry air from the compressor, but then evacuate the system for at least 30 minutes. Ideally, repeat the procedure 2 times.

❓ What to do if, after connecting the collector, a burning smell appears?

The burning smell may indicate:

• Overheating of the compressor (if there is too little or too much freon).
• Ingress of foreign particles into the system (for example, shavings after cutting tubes).
• Electrical problems (check the compressor terminals for melting).

Immediately turn off the refrigerator and check:

1. The pressure in the system (should be at normal).
2. Condition of the compressor contacts.
3. Cleanliness of the tubes (if necessary, purge the system with nitrogen).