Operation of autonomous refrigeration equipment requires the owner to have a clear understanding of the physical processes occurring inside the absorption system. Unlike conventional compressor models, which operate from the mains and emit characteristic motor noise, gas refrigerator operates on the basis of a thermodynamic cycle, where the source of energy is the open flame of the burner. This makes it indispensable in conditions where there is no centralized electricity: in campsites, at remote cottages or in autonomous traders.
However, before starting the first start, you need to realize that working with open fire and flammable gas requires strict precautions. An incorrect sequence of actions during ignition can lead not only to the breakdown of expensive equipment, but also create an emergency situation. In this article, we will analyze in detail each stage of preparing and activating the device so that you can safely enjoy the cold far from civilization.
The startup process is not instantaneous; absorption systems require time to reach operating cooling mode. You will have to check the tightness of the connections, ensure proper ventilation and carefully light the wick, adjusting the intensity of the flame to achieve the optimal temperature. Understanding these nuances will extend the service life of your absorption unit and guarantee its efficient operation in any conditions.
Principle of operation and preparation for launch
The basis of the operation of such a refrigerator is the absorption system in which the mixture circulates ammonia, hydrogen and water. This mixture is heated in a generator under the influence of a gas burner. Unlike electric heating elements, a gas flame requires a constant supply of oxygen for combustion and removal of combustion products, therefore ventilation is a critical safety factor. If the device is installed in a confined space without proper air exchange, there is a risk of carbon monoxide accumulation.
Before attempting to ignite gas, make sure that the refrigerator is installed strictly horizontally. Tilting the housing can disrupt the natural circulation of refrigerant inside the tubes, resulting in water hammer or no cooling at all. Use a building level to check the position of the unit along all axes, since even a slight misalignment can block the operation of the entire system.
Also at the preparatory stage, it is necessary to conduct a visual inspection of the gas line. Check the hoses for cracks, kinks, or signs of rodents, which often damage soft tubes during long periods of inactivity. Make sure that the propane or butane cylinder is securely fastened and is not in direct sunlight, which can lead to a dangerous increase in pressure inside the container.
⚠️ Attention: It is strictly prohibited to operate a gas refrigerator in enclosed spaces without functioning exhaust ventilation. Gas combustion products are odorless and colorless (except for the added odorant), but are deadly if inhaled.
Required tools and leak check
For a safe connection and launch, you will need a minimum set of tools, which every owner of autonomous equipment should have on hand. First of all, it is a soap solution, which is the most reliable and simple way to detect gas leaks. Professional leak detectors are expensive and require calibration, while ordinary soap suds will instantly show bubbles at the point of depressurization.
The leak test should be carried out before the burner is ignited. Open the valve on the gas cylinder and listen carefully to the connections for a characteristic hissing sound. If the leak cannot be detected by ear, apply a soap solution to all joints: at the connection point of the hose to the cylinder, reducer and inlet fitting of the refrigerator. The appearance of even small bubbles indicates a leak in the connection.
It is also important to check the condition of the pressure reducer. The gas in the cylinder is under high pressure, which must be reduced to the operating value for the refrigerator burner. A faulty gearbox can lead to too strong a flame, soot, or, conversely, to the wick fading. Make sure that the gearbox membrane is elastic and not damaged.
☑️ Check before starting
Step-by-step instructions: igniting the burner
The most crucial moment is direct ignition. In most models, such as Dometic or Indel, this process begins with opening the gas tap on the refrigerator itself. It is usually located next to the burner, often hidden behind a decorative panel at the bottom of the housing. Turn the tap to the “open” position and wait 10-15 seconds for the gas to displace the air from the pipeline and fill the combustion chamber.
After purging the line, bring the fire source (a special long gas lighter or match) to the igniter. Do not hold your finger on the piezo ignition button for too long without sparking, so as not to damage the piezo element. As soon as the pilot flame appears, you must immediately press and hold the special temperature sensor (thermocouple) button. This button mechanically opens the gas supply valve to the main burner.
Hold the button for 20-30 seconds. This time is necessary for the thermocouple, heated by the flame, to generate an electric current sufficient to hold the solenoid valve open. If you release the button ahead of time, the thermocouple will cool down, the current will disappear, and the valve will shut off the gas for safety reasons.
After you have released the button and the flame does not go out, you can adjust the height of the wick. The optimal flame height is about 2-3 centimeters. It should be smooth, blue in color, without yellow tongues or soot. A yellow flame indicates incomplete combustion of the gas and a lack of oxygen, which requires adjustment of the air damper.
Setting and adjusting the flame
Correctly setting the combustion intensity directly affects the cooling efficiency and gas consumption. A flame that is too weak will not be able to heat the generator to the required temperature, and the refrigerator simply will not work. An excessively strong flame will lead to overheating of the system, the formation of carbon deposits on the heat exchanger and excessive fuel consumption, which is especially critical in conditions of autonomous travel.
Adjustment is carried out using a special screw or lever located next to the burner. As you turn the knob, watch the size of the flame change. In hot weather, when the temperature difference between the environment and the inside of the chamber is large, the power should be set to maximum. In the cool season or at night, the intensity can be reduced to save the life of the cylinder.
Pay attention to the color of the flame. Perfect combustion produces an even blue color. If you see orange or red hues, this is a sign that the injector is dirty or the gas/air mixture is incorrect. In such cases, it may be necessary to clean the nozzle with a thin wire or purge the system, but only after it has completely cooled down and turned off the gas.
⚠️ Attention: If the flame goes out immediately after releasing the thermocouple button, despite holding it for 30 seconds, the thermocouple itself may be faulty or the contacts have oxidized. Do not try to fix the button with tape or a weight - this is dangerous!
Control of operation and time to enter the mode
After successful ignition, do not expect instant cold. Absorption systems require considerable time to initiate the refrigerant cycle. Typically, the first signs of cooling appear 30-40 minutes after the wick is burning steadily. It may take from 3 to 6 hours to fully reach the operating temperature inside the chamber, depending on the volume of the refrigerator and the ambient temperature.
During the first hours of operation, it is recommended to periodically check the condition of the burner. Make sure that wind or drafts do not blow out the flame. If the refrigerator is installed outdoors or in a poorly protected room, it is necessary to use special wind screens that do not block the access of oxygen.
Control the temperature inside the chamber using the built-in thermometer or a separate device. If after 4-5 hours of operation the temperature does not drop below +10...+12°C, then the system is not working efficiently. The reasons may lie in insufficient flame power, airing of the system, or a malfunction of the absorption unit.
Why does the refrigerator not cool when the fire is running?
The reason may be crystallization of the solution inside the tubes. Sometimes light tapping on the generator body helps (only when it has cooled down!) or briefly increasing the flame to “shake” the system, but this requires caution.
Safety precautions and emergency situations
The operation of gas equipment is always associated with risks, which can only be minimized by strict discipline. The main enemy in this case is human carelessness. Never leave a working gas refrigerator unattended for a long time, especially if there are children or animals in the room who could accidentally touch the cylinder or hose.
If a persistent smell of gas appears (even if the flame is burning), you must immediately close the valve on the cylinder, open all windows and doors for ventilation and evacuate people from the room. Do not turn on electrical appliances or create sparks. Only after the gas has completely evaporated can you begin to search for a leak using a soap solution.
It is also worth remembering about the fire hazard. There should be no flammable objects around the refrigerator, especially in the burner and ventilation area: curtains, paper, aerosol cans, rags. The minimum safe distance to flammable materials should be at least 50-70 centimeters, and to walls with fire-resistant coating - 10-15 cm.
| Parameter | Norm / Value | Action in case of deviation |
|---|---|---|
| Color flame | Smooth blue | Cleaning the nozzle, adjusting the air |
| Wick height | 20-30 mm | Adjustment with the gas supply screw |
| Button holding time | 20-30 sec | Checking the thermocouple and contacts |
| Cylinder pressure | According to the reducer | Replacement gearbox during surges |
| Smell during operation | Absent | Urgently turn off the gas, ventilate |
Frequent problems when starting
Even if all instructions are followed, users may encounter with difficulties. One of the most common problems is air entering the system after a long period of inactivity or replacement of the cylinder. An air lock prevents gas from reaching the burner. In such cases, the gas supply procedure (without ignition) is repeated several times to completely purge the line.
Another common problem is condensation or freezing of the gearbox. With intense gas consumption, the cylinder may cool down, the pressure will drop, and the refrigerator will stop working. In winter or in cold climates, it is recommended to use special thermal covers for cylinders or heating pads to maintain the gas evaporation temperature.
If the wick constantly smokes, forming black deposits on the heat exchanger, this reduces the efficiency of the device. It is necessary to remove the burner and carefully clean the nozzle from dust and cobwebs. Often it is small insects that clog the thinnest channels of the jets during summer storage of equipment.
FAQ: Frequently Asked Questions
Is it possible to turn on a gas refrigerator while the car is moving?
Technically, many models allow operation while moving, but this carries increased risks. Vibration can disrupt the stability of the flame, and in the event of an accident, open gas becomes a factor in the disaster. It is recommended to use the power supply mode (12/220V) while driving, and switch the unit to gas only when parked.
How long does the refrigerator run from one cylinder?
Gas consumption depends on the ambient temperature, power settings and volume of the refrigerator. On average, a standard 5-liter propane-butane cylinder at moderate summer temperatures provides about 150-200 hours of continuous operation. In winter, consumption can increase by 30-40%.
Why does the refrigerator hum or click?
Absorption refrigerators operate almost silently. If you hear gurgling sounds, this is normal; refrigerant is circulating. However, loud clicks or humming may indicate unstable combustion, foreign objects entering the burner area, or a malfunction of the gas valve.
Is it necessary to defrost a gas refrigerator?
Yes, regular defrosting is necessary. The ice crust on the evaporator acts as a heat insulator, causing the system to work harder and consume more gas. Defrosting should be done with the power off and the door open, without using sharp objects to chip the ice.
What to do if the smell of gas is felt only when you turn it on?
A short-term smell during ignition (the first seconds) is acceptable, since a little gas remains in the tubes. If the smell persists or intensifies, turn off the supply immediately. The tightness of the connection between the burner and the generator is probably broken or the gasket has burned out.