Mistral Evaporative Air Con Repair (With Video)
Here in Australia, it gets hot – very hot. But what most people don’t realise is that it also gets very cold. Where I live in New South Wales at an elevation of 702M, the temperatures range from 40°C in the summer, to a chilly -10°C in the winter.
So to say that we need both good heating and cooling is an understatement.
In my little automotive workshop, I use 2 cooling fans. Firstly a small industrial fan that sits on the ground and also an evaporative air conditioner and heater that I picked up off the side of the road – someone else’s cast off.
On this particular day, the mercury was heading toward the 40°mark and you guessed it – that was when my trusty curb-side-find finally gave up.
Most of the features worked – it had power, the fan worked, the heater worked (not that I needed it at this point), but the main complaint was that the recirculating mat that moves the water from the base of the unit, past the fan to provide cooling, would not operate.
Disaster had struck! Repair of this unit became a priority so that I could have cooling back in the workshop again!
The electric motor that drives the rotating mat refused to work. After checking for voltage, the LED indicated that a section of the circuit was working, but the motor was not being supplied the necessary voltage.
After tracing the wiring back to the control circuit board, I could see that a series of triacs (VA 0607 V89S) were used to control the switching of the features. Although some strange readings were seen on-board, after removal from the board, the triacs tested fine. Nearby resistors also were tested and were within parameters.
The main issue was with the triac listed as ‘cool’, so after focusing on the testing it off-board, it was time to test it again, this time on-board.
It seems that dry solder joints were the issue, since the flow operated correctly as soon as I soldered the triacs back on the board.
Just to confirm the repair, I measured the voltage and switching of the triacs. They all operated correctly and after assembly of the cooler and mat assembly with lubrication of the rolling mechanism, I let the appliance operate for 2 hours before calling it a fix.
Everyone one was happy with the result and cool was restored to the workshop.
If you are interested in this repair, you can see a video on my channel following the link below:
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article below: