The process of commissioning a chassis-based refrigeration unit DAF 105 requires strict adherence to the sequence of actions, since the durability of the compressor and the quality of cargo safety depend on this. Unlike their household counterparts, transport refrigerators have a complex climate control system, which is connected to the vehicle’s on-board network and an independent diesel generator. Incorrect initialization temperature controller can lead to false sensor readings or even blocking the installation engine from starting.
Before pressing the start button, you must make sure that all mechanical connections are checked and the refrigerant level is within acceptable limits. Often, drivers and logisticians are faced with a situation where the system does not respond to commands due to the fact that the main ground switch is not activated or the fuel valve is not open. Thermoking, Carrier or Thermo Kinginstalled on DAF have their own nuances, but the basic preparation algorithm is the same for all heavy mainline tractors.
In this article we will analyze each stage in detail: from visual inspection to reaching the operating temperature regime. We will pay special attention to working with the control panel, since this is where most mistakes are made during the initial launch. Understanding the logic of operation electronic control unit will help to avoid downtime during the trip.
Preliminary diagnostics and visual inspection
Any work on the refrigerator begins not with a button, but with a careful inspection of the unit. Make sure that the evaporator and condenser are free of any dirt, leaves or snow that may have gotten there while parked. Clogged radiators lead to a sharp surge in pressure in the system, which forces automatic safety to urgently turn off the engine.
⚠️ Attention: If you find oil stains under the unit or on the pipes, it is strictly prohibited to start the installation. This is a direct sign of a freon or oil leak, which requires the intervention of a service center.
Check the tension of the compressor and fan drive belts. On the chassis DAF 105 vibrations during movement can weaken the fastenings, so manual inspection before the flight is a mandatory procedure. A weak belt can slip, preventing the compressor from developing the required speed, which will lead to ineffective cooling.
Make sure that the electrical connectors connecting the unit to the tractor cab are intact. Oxidized contacts or frayed wires can cause unstable operation controller. Inspect the corrugation going from the cab to the body, since it is in this place that breaks most often occur due to constant friction.
Preparation of the fuel system and power supply
Refrigeration units on the DAF 105 are usually powered by fuel from the main tank of the car or have their own small tank. If a common tank is used, the corresponding fuel intake valve must be opened. In winter, this is a critically important stage, since condensation could form in the tank.
The power supply system requires connection to a 24 Volt on-board network. The power indicator on the control panel should light up. If this does not happen, check the fuses in the driver's cab and directly on the refrigeration unit housing. Often the problem lies in the oxidation of contact group battery.
☑️ Check before starting
It is important to remove air from the fuel line if the unit has been idle for a long time. For this purpose, many models have a manual fuel pumping button or a corresponding function in the service menu. The lack of fuel in the pump when trying to start can damage the plunger pair.
Algorithm for turning on the control panel
After checking the mechanics, we move on to the electronics. There is a Power button on the front panel. After pressing it, the system performs a self-test, during which all display segments light up. If the screen remains black, there is a power problem or the display module itself has burned out. Modern controllers, such as display module.
Modern controllers such as Micro-Link or their analogues, require entering a password or selecting an operating mode if the system has been mothballed. Standard mode is usually selected automatically, but sometimes you need to manually specify the load type. In the settings menu you can find parameters Set Point (temperature setpoint) that need to be set before starting.
Sequence of actions on the panel:
- 🔘 Press and hold the button On/Off for 3 seconds until the logo appears.
- ❄️ Wait for the self-diagnosis of the sensors to complete (takes about 10-15 seconds).
- 🌡️ Set the required cargo temperature using the navigation arrows.
- 🚀 Press the button Start to start the installation engine.
Some modifications for the DAF 105 require activation of the "Standby" mode before full start-up, especially in the cold season. This allows the oil in the compressor crankcase to warm up, which reduces wear on rubbing parts during startup. Ignoring warm-up can lead to scuffing in the cylinders.
Starting the engine and entering mode
When you press the start button, the starter begins to turn the engine of the unit. Normal startup takes 2 to 5 seconds. If the engine seizes and stalls, or the starter idles, you need to stop trying and look for the cause. Frequent unsuccessful starts drain the tractor's battery.
After a successful start, the engine begins to operate at higher speeds. At this moment, the primary pumping of refrigerant through the system occurs. You can determine the work by ear compressor: it makes a characteristic rhythmic sound. If a metallic knock or whistle is heard, the unit must be turned off immediately.
| Parameter | Normal value | Critical value |
|---|---|---|
| Revolutions engine | 1500-1800 rpm | < 1000 or > 2200 rpm |
| Boost temperature | Depends on the setpoint | Above the set point by 10°C after 30 min |
| Oil pressure | 2-4 bar | < 1.5 bar |
| Main voltage | 24-28 Volt | < 22 Volt |
In the first 10-15 minutes of operation, the system will operate at maximum power, trying to quickly cool the volume of the body. It is not recommended to open the van doors at this time, as this will disturb the sensors and cause control algorithm to work incorrectly. The controller must stabilize the temperature inside the chamber.
Adjusting temperature conditions and monitoring
Different types of cargo require different settings. Frozen products (meat, fish) require a temperature of about -18°C, while chilled products (vegetables, fruits) require a temperature from 0°C to +4°C. An error in choosing a mode can lead to damage to the cargo. The controller DAF 105 allows you to switch between modes Freeze (freezing) and Cool (cooling).
In cooling mode, the evaporator fan can operate cyclically so as not to freeze the product near the walls. In freezing mode the airflow is constant. It is important to correctly position the cargo temperature sensors (if they are remote) so that they do not touch the walls of the body and are in the air flow.
⚠️ Attention: Never set the temperature on the panel lower than the installation can produce under current conditions. This will cause the engine to run continuously due to wear and tear, since the desired temperature will never be reached.
Modern systems allow you to keep a temperature log. Check the screen periodically for change history. If you see sudden jumps, it is possible that the doors have been opened too often or the seals of the body have been broken. seals body
Typical errors and fault codes
The DAF 105 electronics are equipped with a self-diagnosis system. If problems occur, an error code appears on the display. The most common codes are related to oil pressure, engine temperature, or faulty sensors. Ignoring these signals leads to a major overhaul.
Deciphering the main codes:
- 🛑 Alarm High Engine Temp — overheating of the unit’s motor. Check the antifreeze level and the cleanliness of the radiator.
- 🛢️ Low Oil Pressure —low oil pressure. Perhaps the oil is cold or the level is critically low.
- 🌡️ Sensor Failure — an open or short circuit in the temperature sensor circuit.
- ⚡ Charge Fail — the generator does not charge the battery or the voltage in the network has dropped.
What to do if the error code is on?
Do not try to reset error by repeatedly turning on and off. Find the (instructions) for your specific controller model. Often the code does not indicate the breakdown itself, but its consequence. For example, a pressure error can be caused simply by thick oil in the cold.
If the installation gives an error, but visually everything is fine, try performing a reboot cycle: turn off the power, wait 30 seconds, turn it on again. If the error repeats, call the service. Independent repair of the refrigeration circuit without a license and equipment is prohibited.
Features of operation in winter
Winter start-up of the refrigerator on the DAF 105 has its own characteristics. Diesel fuel becomes waxy at low temperatures, so the use of winter diesel fuel or anti-gel is mandatory. The fuel filter can become clogged with paraffin crystals within a few minutes of operation.
The battery loses capacity in the cold. Before starting the unit in severe frost, it is recommended to warm up the tractor cab and allow the main battery to charge. A weak starter current will not be able to crank the compressor with thickened oil.
Also watch out for the formation of ice in the drainage system. If the condensate does not have time to drain, it will freeze and block the operation of the evaporator. Periodically checking the drainage holes and clearing them of ice plugs is part of winter maintenance.
FAQ: Frequently asked questions
Why does the DAF 105 refrigerator not start the first time?
Most often the reason is airing in the fuel system or discharged battery. It is also possible that a startup block may occur due to low oil level or refrigerant pressure protection. Check the error codes on the display.
How often should you change the oil in the unit?
The recommended oil change interval in refrigeration units is 500-1000 operating hours, depending on the engine model and operating conditions. In difficult conditions (dust, temperature changes), the interval is reduced.
Is it possible to transport products without pre-cooling the body?
It is strictly not recommended. The refrigerator is designed for maintenance temperature, and not for quickly cooling hot cargo. Products must be loaded already cooled to the required temperature.
What does a flashing light on the panel mean?
Flashing usually indicates an active process (for example, defrosting in progress) or a warning (maintenance required, low fuel level). A constant light of the red indicator means an emergency stop.
Is it necessary to turn off the installation during stops?
If the cargo requires a strict temperature regime, the installation cannot be stopped. Modern installations are economical. If the cargo is frozen and the body holds heat well, a short stop is acceptable, but requires constant monitoring of the temperature inside.