Thanks for your response but it seems you missed my main point, which is when using the Infinity control with the ventilator attached via a NIC, you do NOT have proper control of the ventilation. I have tested this system in other houses also and the controls do not provide the necessary control of the ventilation system.
I have eliminated the connection to the Infinity unit, installed a stand alone control and my system now works perfectly. I have proper ventilation and proper humidity for my climate in the winter.
We have about 10 days a year where an EVR would be nice but for 355 days an HVR is the correct ventilation unit in Minneapolis. On those 10 days I run the A/C to dehumidify.
My system is sized properly, additionally I have a hybrid system with a heat pump and a 3 stage high effecient furnace. My supply air temp is around 100 degrees so the heating system has a small drying effect.
Running your EVR constantly may; A)ventilate properly, B)under ventilate, or C) over ventilate.
Without testing, measuring, and calculating what the proper volume of air which is required for your situation and measuring the amount of air the ventilator provides and factoring in the occupancy load and life style, you are just guessing.
You need to have control over the ventilation device so you can control the volume of air you are exchanging in the house. Additionally you can adjust is volume of air - by fan speed and duration/runtime. A you want to be able to easily change it if the situation changes, like a party with 20 of your closest friends or a teenage sleep over... Chances are you need to crank up the ventilation...
OR if you have one or two adults who don't cook and take their showers at the gym, in a 3000 sq ft house you need less volume of air being exchanged.
You have to have this kind of control for the system.