When buying a second-hand old van / van / converted camper , often it is equipped with a “Trimix” period fridge.
But what is this beast there?
What are the advantages, disadvantages, and why to change for a compression refrigerator more recent ?
“Sort” for three energies "mix" because it is able to change energy with a simple snap of a finger (or rather pressing a button).
A Trimix refrigerator therefore has an advantage, can operate in three modes :
- Electric 12V: when driving, the engine (rather the alternator), operates the fridge. The major drawback is that the old technology used makes it very (very very) energy-intensive and when stopped, it can drain the entire auxiliary battery in just a few hours. Not really ideal so...
- Gas (propane or LPG): to counter the 12V fault, this is the preferred mode when stationary so as not to be left without electricity. Generally, in this mode, it is necessary to pump with a small pump integrated into the fridge before using the piezo ignition to light the system. It works very well (when it wants to start well), and with a 12L bottle, we are quiet about 15 days on average by running it constantly. Not bad, but it still consumes a little. The downside is maintenance. Over time, you have to clean the burnt gas exhaust chimney (often the cause of a fridge that won't start), the piezo can do its thing, etc... In short, it ages badly and the parts are more and more hard to find.
- 220V / 110V: If you go to the campsite or to friends, you can directly connect the van to an electrical outlet and switch the fridge to this last mode. Thus, we end up with a fridge, almost like at home. Great ! But hey, the van is made to move anyway...
On paper a Trimix fridge therefore has the advantage of never running out of energy there are so many possibilities to keep it cold (or rather cool when it's very hot outside). Yes, but as we said the problem is consumption and the generated cold report…
These refrigerators are sometimes more than 30 years old (we made things to last at the time anyway), and they often reach the end of their life.
Since technology has evolved and new fridges have appeared: compression fridges.
Trimix refrigerators therefore use old technologies, and today the new ones compression fridges 100% electric are so energy efficient that Trimix have become totally obsolete.
quickly became the new standards, they are therefore naturally found on all new converted vehicles today. They operate at a single energy 12V (sometimes also in 220V/110V, but it is quite rare or optional).
But why remove the gas function? Because with a battery, even of low capacity, can easily last 2-3 days without moving and without reloading. And with a solar panel on the roof, the operating autonomy is further increased. The gas mode is therefore no longer an advantage at all, on the contrary it takes up space unnecessarily. In effect, by removing the gas system, manufacturers have been able to gain in useful volume. For the same outside dimension of fridge, we end up with almost 1/3 more refrigerated volume!
When we have changed the fridge our dear Popo (our orange T3 in America), for a model of the brand Webasto model Cruise 49 compression (49L capacity), what advantages have we drawn from it? If you have read correctly, you already know:
- a fridge that stays cold even at high temperatures and who even makes ice cubes in the freezer compartment.
- a gas autonomy that has gone from two weeks to 6 months! (only two gas hobs left to power).
- more internal volume to put food and therefore more autonomy on the road to go further.
- the comfort of a modern fridge : lighting, adjustable thermostat, etc…
So many advantages in the end, and we do not regret. So much so that when we completely restored “Kaktus”, our second VW T3 Syncro in Europe, (see the complete restoration in video here) we naturally changed the refrigerator directly for the same model Webasto.
For the installation nothing more simple, two wires to connect and plug the old gas chimney outlet and you're done.
In addition with a little ingenuity, we were able to keep the original door of the Westfalia kitchen cabinet of our two T3, to integrate them perfectly. What else ?!
Basically, a Trimix fridge manages to generate an internal temperature that is 20°C lower than the outside temperature. When it is 25°C outside everything is fine, we manage to have 4-5°C in the fridge, which is the perfect temperature. But when the temperature, mount them conservation issues depending on the food arrives…
Do we tell you about the time we were in Death Valley in California by 53°C? We let you do the math...
> Do not hesitate to ask your questions in the comments, we will be happy to answer them <