I’m not familiar with this bike or know if it should be changing resistance automatically, but you should be connecting (pairing) it as both power and resistance on the pairing screen when first starting up Zwift.
One of the benefits of QZ is that the developer (@Roberto_Viola) will provide a lot of support to debug interoperability problems. He’s helped many people make spin bikes work with Zwift. There is also a qdomyos-zwift Facebook group where you might find other Merach bike owners using QZ.
The Companion app provides an alternate way to pair your equipment, so you could try that as well, but in theory it should not make a difference.
Success, at least for the moment, with the auto resistance. Tried a few minutes of a hilly route, with grades from -2% to +6% and the bike adjusted resistance accordingly, with no need to do anything other than connect to Zwift.
I will try a longer hill ride in the next day or two as time permits, and will update.
Okay, yes, the Merach does in fact change resistance based on Zwift grade percentage. I did a 30 minute ride called something like “Latta Lava” with varying degrees of grade and the bike increased/decreased resistance in time with the changes.
However, as with Merach’s own riding app, on the flats or downhills it stays at level 1. At that level my cadence shoots way up, typically above 100, with hardly any perceived resistance, and it’s practically impossible to get my heart rate into my Zone 2 range. Manually changing resistance defaults after a few seconds to match the bike’s interpretation of Zwift grade…usually back to 1.
I then tried a bit of a HIIT workout called “Sevens”; resistance stayed at Level 1, so to do the intervals I had to increase cadence way above 120, again without much perceived increase in effort.
So, yep, it works, but nope, I’ve not gotten it dialed in to be able to mimic real riding.
I should probably mention that to give you an idea of how easy Level 1 is, at age 75 the effort is not enough to get my heart rate into a basic, low Zone 2 zone.
Perhaps a few suggestions for more vigorous workouts/rides would get me where I want to be…