I likewise have been having enormous trouble reducing the hours outside of
the throttling range for my design case building. In the winter months in
the morning I will have multiple hours outside of the throttling range for
multiple zones and this exceeds 300 hours.

Things I have varied but did not solve the problem include:

1. Occupancy schedule
2. Heating Design Day Schedule
3. Night Setback Temperature
4. Boiler Size
5. Loop Capacity
6. Pump Size
7. Delta T for heating and Pre-heating coils
8. Minimum Outside Air
9. Throttling Range
10. Design temperature

At this point I am randomly changing settings to reduce the amount of hours
outside of throttle range, but I would like to have a more deductive
process.

I have a suspicion that there was a setting in the wizard that is overriding
my inputs, but that is conjecture.

My engineer designed the system in Trane Trace and oversized it by 25% so
the designed heating equipment should be adequate.

Thank you,

James F. Geers