Setting up the refrigerator relay: instructions with diagrams and nuances

A relay in a refrigerator is a small but critical element that is responsible for starting the compressor and maintaining the set temperature. Incorrect settings can lead to overheating of the motor, increased energy consumption, or even breakdown of the unit. In this article, we will look at how to independently adjust start-protective i thermostatic relay, what tools you will need, and what to look for when working with different models of refrigerators - from Soviet Biryusa to modern Samsung i Liebherr.

It is important to understand that setting the relay does not always require intervention: in 80% of cases, problems with the operation of the refrigerator are associated with dirty contacts, wear of parts, or incorrect thermostat parameters. Before you start making adjustments, check whether the reason lies elsewhere - for example, a compressor malfunction. If you are not confident in your abilities, it is better to contact a specialist: an error in setting the relay can cost more than calling a specialist. freon leak or compressor malfunction. If you are not confident in your abilities, it is better to contact a specialist: a mistake in setting up a relay can cost more than calling a specialist.

Types of relays in the refrigerator: which one is responsible for what

Two types of relays are usually installed in the refrigerator, and they should not be confused:

• 🔧 Start-protective relay —starts the compressor and protects it from overloads. Located next to the motor, often in a plastic or metal case with the inscription R1, RLS or Overload Protector.
• ❄️ Thermal control relay (thermostat) - controls the temperature in the chamber and sends a signal to turn the compressor on/off. It can be mechanical (with an adjustment knob) or electronic (with a display).

In modern models (for example, LG No Frost or Bosch VitaFresh) the relay functions are often combined into a single electronic control unit. In old refrigerators (ZIL, Minsk), the relays are mechanical and are adjusted manually. Before you start adjusting, determine the type of your relay - this affects the algorithm of actions.

💡 How to distinguish a relay malfunction from other breakdowns? If the refrigerator does not turn on at all, the problem is most likely in the start-up relay or compressor. If the motor runs without stopping, but the temperature does not drop, the thermostat or a refrigerant leak is to blame.

Tools and preparation: what you will need to set up

To adjust the relay, you don’t need professional tools, but you can’t do without a minimum set. Here's what will come in handy:

• 🔧 Phillips and flathead screwdriver (for removing covers and accessing the relay).
• 📏 Multimeter (for checking resistance and voltage).
• 🧲 Magnet or marker (so as not to mix up the wires when disconnecting).
• 🔍 Flashlight (illumination of hard-to-reach places).
• 🧤 Rubber gloves (protection against static electricity).

Before starting work be sure to unplug the refrigerator and defrost it (if required). If the relay is located on the back wall, provide access - move the refrigerator away from the wall. In models with a bottom-mounted compressor (for example Indesit or Atlant), you may need to remove the bottom panel.

⚠️ Attention: Do not touch the relay contacts with your bare hands if the refrigerator was turned on less than 10 minutes ago - the residual charge may shock electric shock Use tools with insulated handles.

Setting up the start-up protection relay: step by step

The start-up protection relay is responsible for starting the compressor and protecting it from overheating. If the refrigerator does not turn on or the machine knocks out when starting, the problem is in this unit. Let's look at how to set it up.

Step 1. Removing the relay. Carefully remove the relay from the compressor by disconnecting the terminals. In most models it is secured with latches or screws. There is usually an arrow on the relay body indicating the correct installation position - remember it.

Step 2. Checking the contacts. Inspect the contacts for oxidation or burning. If they turn black, clean them with fine sandpaper (zero). Severely damaged contacts will have to be replaced.

Step 3. Adjusting the current. There is a screw on the relay body (sometimes hidden under a plug), which is responsible for the strength of the shutdown current. Standard values:

For To make adjustments, use a screwdriver with a thin blade. Turning the screw clockwise increases the shutdown current, counterclockwise decreases it. After changing the setting, be sure to check the operation of the compressor with a multimeter in ammeter mode - the current should not exceed the rated current by more than 20%.

Inspect the housing for cracks|Check the circuit with a multimeter (winding resistance)|Clean contacts|Adjust the shutdown current|Check the operation of the compressor after installation-->

Adjusting the thermostatic relay (thermostat)

The thermostat is responsible for maintaining the temperature in the chamber. If the refrigerator works without stopping or, conversely, turns on too rarely, the problem is in the thermostat settings. In mechanical models, adjustment is carried out by rotating a knob or screw, in electronic ones - through the settings menu.

For mechanical thermostats (for example, Danfoss KP or Ranco K59):

1. Remove the temperature adjustment knob (it can be attached to a latch or screw).
2. Under use the handle to find the adjusting screw (usually with a spring).
3. Turning the screw clockwise increases the shutdown temperature (the refrigerator will turn on less often), counterclockwise - decreases (turn on more often).
4. The adjustment step is ¼ turn. After each change, wait 6-8 hours for the temperature to stabilize.

1. Press and hold the "Super Freeze" (or "Fridge") button for 5-10 seconds.
2. In the menu, find the "Temperature Calibration" or "Offset" item.
3. 0.1). A positive value increases the temperature, a negative value decreases it.