My point, I am very interested in technical stuff, I like exploring possibilities and limits, I like to optimize, I like to investigate.
In the end, if I came over a wreck of a 2551 and pulled the main control board from it, what would I need to do to get that board to work in a 2051...
As a side note. Previously I installed a lot of residential heat pumps from Toshiba. They had a serie, labeled XXXX-10, XXXX-13, XXXX-16 etc size. On the outdor units the only difference was, absolutely nothing, still the outdoor units knew if it was a 10, a 13 or a 16 size. The way this was done was that there was three wire links which could be cut. From factory all was uncut, and one had to cut to a spesific pattern to configure the outdoor unit to the correct size.
I would hazard a guess it could be as simple as this that Ricoh also have done with the controller board to distinguish wheter it should act as a 2051 ot a 2551, except it is not as obvious as a wire link, it could be a smd resistor with different values for example.
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