Here is how it works. The blower and servo are controlled by the same basic logic, which is the HM using PID parameters along with Pit Probe temperature data to assign a speed/position. The servo position always correlates with the HM 0-100% position (unless set to open/close only mode) but the fan will follow the Min/Max/Startup rules in addition to the HM %. So if Startup max is 100% and Max is 50% the fan will blow at 100% until the pit temp is achieved the first time, from then on when the HM is at 100% the fan will actually be at 50%, and when the HM is at 80% the fan will actually be at 40% etc. With the fan "on at Max Only" setting selected, in the above scenario, the fan will blow at 100% until the pit temp is achieved the first time, when the HM backs down to 99% or below the fan will go OFF and the damper alone will operate from 0-99%. However, if the HM ever reaches 100% again the blower will turn on at 50% (the MAX value) until the HM goes back down to 99% or below, at which time it will turn back off...
Bryan, for the new on above %, if you wanted it to be on at max only, would you set it to 99% or 100%?
Thanks!
Well IDK what to say then, I just did that test several times... You can see it there on my graph...
Is there anything else in my setup that may cause this behavior, like carrying over HM settings or something?