A sudden stop of the compressor or its humming without starting often indicates a failure of the starting mechanism. In refrigerators Nord this unit is responsible for supplying a starting pulse to the motor windings, and its breakdown makes the operation of the entire cooling system impossible. Replacing this element does not require deep knowledge in electronics, but requires strict adherence to safety precautions and sequence of actions.
Before starting disassembly, you need to make sure that the problem lies in the relay, and not in the compressor or wiring itself. Starting relay is a compact device that wears out over time: the contacts burn out, and the internal spring loses its elasticity. In this article, we will look in detail at how to correctly diagnose a malfunction, select the appropriate analogue and make the connection to get your refrigerator working again.
Diagnostics of a faulty starting device
The first sign that start relay requires replacement, there is a characteristic click, followed by the hum of the motor, but the start itself does not occur. After a few seconds the thermal protection is activated and the sound stops. If you hear this cycle repeating every few minutes, there is most likely a problem with the starter or motor windings. However, before purchasing a new part, it is worth conducting a visual inspection.
Remove the back panel of the refrigerator Nord and get to the compressor. Carefully remove the plastic casing that hides the electrical part. Pay attention to the appearance of the relay: if traces of burning, melting or cracks are visible on the body, its performance is in question. It is also worth checking the contacts for oxidation, which often occurs due to high humidity or condensation.
For more accurate diagnostics, you can use a multimeter in resistance measurement mode. Ring the relay contacts: in a normally closed state, the resistance should be close to zero. If the device shows infinity or the values deviate greatly from the norm, the part is faulty. Remember that even if visually the device looks intact, the internal mechanics may have worn out.
Preparation for replacement and selection of components
For successful replacement you will need a minimum set of tools: flat and Phillips screwdrivers, pliers and, preferably, a multimeter. Before starting any work be sure to unplug the refrigerator from the electrical outlet. Working with live electrical appliances is strictly prohibited and can result in serious injury or electric shock.
The key point is to select the correct new relay. Devices for refrigerators Nord may differ in connection type (2 or 3 contacts) and power. An article number or marking is usually stamped on the body of an old part, for example, RTP, RT or RZ. If the markings are erased, it is better to remove the part and take it with you to the store for comparison.
The table below shows the main types of relays used in various models of refrigerators Nordand their compatibility:
| Relay type | Number of contacts | Compressor power | Application in Nord models |
|---|---|---|---|
| RTP-1 | 2 contacts | up to 1/4 hp | Old models, low power units |
| RTK-X | 3 contacts | up to 1/3 hp | Classic two-chamber refrigerators |
| RZ-1 | 3 contact | universal | Modern models with inverter motors |
| PZR-10 | 3 contacts | up to 1/2 hp | Powerful industrial and household models |
When purchasing, pay attention to the build quality of the case and the mobility of the internal elements (if the design allows you to see them). Cheap Chinese analogues can work unstably, which will lead to rapid failure of the compressor itself.
Can universal relays be used?
Universal starting relays often have different pinouts of contacts. They can be used if you resolder the wires correctly or use adapters, but it is better to look for original spare parts or complete analogues in the manufacturer’s catalog.
Step-by-step instructions for dismantling the old relay
The process of removing the faulty part begins with removing the compressor protective casing. It is usually secured with latches or screws. Be careful, the plastic on old refrigerators Nord can be brittle and brittle. After removing the casing, you will see the compressor with the relay block and thermal switch attached to it.
The relay is held on by three pins coming out of the compressor. To remove it, you need to gently rock the device from side to side, while simultaneously pulling it towards you. Do not use excessive force to avoid damaging the copper tubes or breaking the pins. If the relay is stuck, you can slightly warm it up with a hairdryer, but not with an open fire.
☑️ Checklist before dismantling
After removing the relay, disconnect the wires. Before doing this, it is strongly recommended to photograph the connection diagram or sketch it. Wire colors may vary between versions, and an assembly error may result in a short circuit. Typically, black, red and white wires are used.
⚠️ Attention: Never try to remove the relay with a jerk. A sudden movement can damage the compressor outlet pipes, which will lead to depressurization of the system and leakage of freon. Repair in this case will become economically unfeasible.
Connection diagram and installation of a new device
Installation of a new one starting relay is carried out in the reverse order of dismantling. First of all, you need to correctly connect the wires to the contacts of the new part. Refer to previously taken photographs or markings on the case. Typically, the upper contact is responsible for the starting winding, and the lower one is responsible for the working winding.
It is important to ensure a tight fit of the contacts. If the wire terminals are loose, they can be carefully tightened with pliers. Poor contact will cause the relay to spark, heat up and burn out again. Make sure that the wires do not touch the compressor housing, as it can reach high temperatures during operation.
After connecting the wires, slide the relay onto the compressor pins. It should fit tightly and without play. The orientation of the relay matters: there is often an arrow on the body indicating the "Up" or "Top" direction. Installation upside down will result in incorrect operation of the mechanism and the inability to start the engine.
The final stage of installation is checking the fixation. Pull lightly on the relay to ensure it is securely attached to the compressor terminals. Only after this can the protective casing and the metal back panel of the refrigerator be reinstalled Nord.
Checking functionality after replacement
After completing the installation work, the most important stage begins - testing. Plug in the refrigerator. In the first seconds, you should hear the compressor start confidently without prolonged buzzing or clicking. If the motor runs smoothly, it means connection diagram it is assembled correctly.
Pay attention to the temperature of the relay housing during operation. After 10-15 minutes of operation, it should not heat up to the point where it is impossible to touch it. Slight heating is acceptable, but a strong increase in temperature indicates problems with contacts or power mismatch.
It is also worth checking the operating cycle of the refrigerator. It should gain temperature, turn off and turn on again according to a timer or thermostat readings. If the compressor operates continuously, perhaps the problem was not only in the relay, or the tightness of the circuit is broken.
Typical errors during self-repair
One of the most common mistakes is ignoring the relay orientation during installation. Many craftsmen forget that the mechanism inside works under the influence of gravity, and an inverted device simply will not close the contacts to start. This leads to a false diagnosis of a malfunction of the new part.
Another mistake is poor stripping of contacts or the use of wires with damaged insulation. There is always vibration in the compressor area, and any weak contact will sooner or later lead to sparking. Always check the condition of the wires before installing a new relay.
Some people try to repair old relays by sanding the contacts with sandpaper. In modern production conditions, this is a temporary measure. The contact material burns out, and after a short time the problem returns. In addition, violation of the factory calibration of the spring can lead to sticking of the contacts.
⚠️ Attention: If after replacing the relay the compressor hums but does not start, immediately turn off the refrigerator. Long-term operation in this mode (more than 10-15 seconds) can burn the motor windings, and then repairs will cost much more.
Frequently asked questions (FAQ)
Is it possible to install a relay from another manufacturer on a Nord refrigerator?
Yes, it is possible if the electrical characteristics and type match fastenings The main thing is that the voltage, current and number of contacts match the original. Universal relays of the PZR or RTK series are often suitable.
Why does a new relay burn out after a few days?
There may be several reasons: the compressor itself is faulty (interturn short circuit), problems with the network voltage or incorrect installation (inverted position). It is also worth checking the thermal relay, which is paired with the starting relay.
Is it necessary to evacuate freon to replace the relay?
No, replacing the starting relay is done electrically and does not require intervention in the refrigeration circuit. The system remains sealed and freon does not come out unless you damage the tubes during careless dismantling.
How to distinguish the starting relay from the protective one?
The starting relay is usually larger in size and has a plastic case in black or white. A protective (thermal) relay is often a tablet or a small block that is placed directly on the pins of the compressor in front of the start relay or is located under it.
How much does it cost to replace the relay in the service compared to self-repair?
Independent replacement will cost the cost of the part itself (from 500 to 1500 rubles). At the service center, the cost of calling a technician and work will be added to the cost of the part, which can increase the amount by 2-3 times.