I think you pull the bypass handle to open the bypass and push it in to close the bypass and engage the cat. It should be apparent when the cat is engaged. Smoke should stop emitting from the chimney. A catalytic probe thermometer also will help.
The manual is located here:
https://www.hearth.com/talk/wiki/jotul-stoves/?noRedirect=1
download the Jotul 8 newer catalytic manual - Jotul 8_1097.pdf
The manual is located here:
https://www.hearth.com/talk/wiki/jotul-stoves/?noRedirect=1
download the Jotul 8 newer catalytic manual - Jotul 8_1097.pdf
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