NPE-210A2 'Descale Mode' in Advanced Menu

[RCY]

I just had a Navien NPE-210A2 installed. In the advanced menu, there is #5. 'Descale Mode' listed after item #4 - Special Operations, however, the owner's manual makes no mention of this mode and doesn't show it in the Advance Menu settings in the owner's manual, despite the message showing to Refer to Owner's Manual. The Owner's Manual only shows up to #4.

Does anyone have any insight into this setting? I'm hoping it does something magical when it's time to descale the unit.

Thanks.

 

[RCY]

So, I tried using the descale mode and it activates the internal recirculation pump (in the A2). I stopped it without digging any further.

Thoughts? Do you think this means that there's no need for an external pump when descaling the heater? Wondering if I can just fill a bucket with vinegar, connect two hoses to the service valves and activate the Descale Mode, and the internal pump will take care of the circulation?

I asked Navien and they avoided answering the question by stating that a professional should descale (despite the fact that the descaling instructions are in the User's Manual).

Thanks.