Connecting a relay to a Nord refrigerator: diagrams, tools and step-by-step algorithm

1. Types of relays in Nord refrigerators: how to distinguish them?

In refrigerators Nord two types of relays are used, and they are often confused. An error in determining the type leads to incorrect connection and the risk of burning the compressor. Here's how to recognize them:

• 🔧 Start relay (induction or posistor) - connect directly to the compressor, usually attached to its body. It has 2-3 outputs and is used to start the motor. In models Nord before 2015, the type RLS-8 or DANFOSS 103N0020.
• 🌡️ Thermal control relay (thermostat) is often found - located inside the refrigeration chamber, next to the lighting lamp. It has capillary tube a connector with 3-4 wires. Popular models for Nord: K-59, TAM-133.

Visually, the starting relay looks like a small box (often black or gray) with a metal fastening, and the thermal relay looks like plastic block with temperature control knob. If in doubt, look at the markings: the starting relay will indicate current and voltage (for example, 220V 1.5A), and on the thermal relay - temperature range (for example, -24°C..+8°C).

In models Nord with system No Frost (for example Nord 510-6) the thermal relay can be combined with an electronic control unit. In this case, its replacement requires reflashing the module - it is better to entrust this to a service center. But the starting relay in such refrigerators is changed according to the standard scheme.

2. Tools and materials: what you need for work

Before disassembling the refrigerator, prepare everything you need. The absence of even one tool can delay the process for hours:

• 🔨 Screwdrivers: cross (PH2) and flat (3-4 mm) In some models. data-i="91">(for example, Nord (For example, Nord 233-4) screws with a non-standard head are used - a screwdriver may be required Torx T10.
• 📸 Camera or smartphone - to fix the original position of the wires and connectors. This will save you from mistakes during reassembly.
• ⚡ Multimeter (tester) - to check the integrity of the circuits and the functionality of the new relay. Even a budget model with a dialing mode is suitable.
• 🔌 New relay - must correspond to the refrigerator model. data-i="99">relays are suitable Nord fit relays RLS-4, RLS-6, DANFOSS 103N0216 (for compressors SEC/ACC).
• 🧲 Magnet or marker - to temporarily fix small parts (screws, springs) and not lose them inside the case.

If you are working with a thermal relay, you will additionally need silicone grease for the capillary tube (for example, WD-40 SpecialistWithout it, the tube may break during installation. For the starting relay, lubricant. not needed, but useful heat shrink tube (diameter 3-4 mm) for insulating contacts.

⚠️ Attention: In refrigerators Nord with inverter compressors (series Inverter Pro) the starting relay is integrated into the control board. Replacing it requires soldering and setting parameters through the service menu - without experience it is better not to take risks.

3. data-i="122">The starting relay is the most common culprit of breakdowns. Its connection seems simple, but there are pitfalls. Follow the algorithm:

The start relay is the most common culprit of breakdowns. Connecting it seems simple, but there are pitfalls. Follow the algorithm:

1. Disconnect the refrigerator from the mains and wait until the capacitors are discharged (5-10 minutes) In models Nord with electronic control (for example, Nord 518-7) plug from the socket for 30 minutes to reset errors.

2. Remove the back cover. compressor. It is secured with 3-4 screws. Carefully set it aside - there is often a connection diagram on the inside.

3. Disconnect the wires from the old relay. Remember or take a photo of their location! A relay type RLS usually has 3 contacts:

   • 🔌 C (Common) - common wire (most often black or brown).
   • 🔥 S (Start) - starting (usually red or orange).
   • ⚡ R (Run) - working (white, yellow or blue).

After connecting, turn on the refrigerator and check the operation of the compressor. It should start without any extraneous sounds (knocking, grinding) and after 1-2 minutes go into normal mode (quiet humming). data-i="144">or does not start or turns off immediately, the problem may be:

• 🔌 Incorrect connection of the wires (check the diagram again).
• 🔋 Discharged starting capacitor (needs replacement).
• 🛠️ Jammed compressor (requires diagnostics by a technician).

4. Connecting a thermostatic relay: nuances and diagrams

The thermostat is responsible for maintaining the temperature. Replacing it is more difficult. starting, due to the capillary tube and many wires. In refrigerators Nord two main connection schemes are used:

Algorithm for replacing the thermal relay:

1. Disconnect the refrigerator and remove all products from the chamber. Turn the thermostat knob to position 0 (off).

2. Remove the plastic cover inside the chamber (usually secured with latches). Under it you will see a relay block with a capillary tube.

3. Carefully remove the tube from the mount. Don't pull it by the base - it's fragile! In models Nord the tube is often fixed with a plastic clamp.

4. Disconnect the wires, having previously photographed their location. If the wires are connected through terminals, use a flathead screwdriver to carefully disengage them.

5. Install a new relayby connecting the wires according to the diagram. Fix the tube in the same position as the old one - its bend affects the accuracy of measurements!

⚠️ Attention: In refrigerators Nord with two chambers (models 518-7, 520-8) is used two thermal relays — one for each camera. They should not be confused: the relay for the freezer has a lower temperature range (up to -24°C).

5. Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when connecting the relay. Here the most common of them and ways to prevent them:

• 🔌 Mixed wires on the start relay. If you connect Start . If you connect Run in the wrong places, the compressor will try to start, but will not be able to. Consequence: combustion of the motor windings Always check the circuit on the compressor cover or in. instructions.
• 🌡️ Improper position of the capillary tube. If the thermal relay tube touches the walls of the chamber or is bent at a right angle, the temperature readings will be incorrect. Consequence: the compressor runs without stopping or, conversely, does not turn on. The tube must be secured parallel to the rear wallwithout sharp bends.
• ⚡ Ignoring the test with a multimeter. defective! Before installation, check it in the continuity mode: between the contacts 3 and 4 (for a thermal relay), the resistance should change when the knob is rotated.
• 🛠️ Forget about the capacitorIn some models Nord (For example, Nord 243-5) the starting relay is paired with a capacitor. If you replace only the relay, the compressor will not start. The capacitor is checked with a multimeter in capacitance measurement mode (should be 15-25 uF).

Another typical mistake is using a relay from another model. For example, a relay from Atlant may physically fit Nord, but have different current or temperature characteristics. Always check the markings for refrigerators! compressors Nord with compressors SEC relays of the series RLSare suitable, and for ACC — DANFOSS.

6. Checking operation after connection

Successfully replacing the relay is only half the battle. Now you need to make sure that the refrigerator is working correctly:

1. Listen. compressor within 5 minutes after turning on:

   • ✅ Normal: quiet hum, no knocking or vibration.
   • ❌ Problem: compressor does not start (check the relay and capacitor) or turns off immediately (possibly the protection against overheating).