General Description: On the radiators themselves there are two types of adjustments(at least they both *look like* adjustments): A large knob close to the floor at one end of each radiator. And, two screws, one at each end 'fin', about 1/3rd way up from the bottom of the unit. See: http://www.salvosites.com/images/userimgs/10756/52632_4.jpg (Look carefully towards bottom - you will see screw I'm referring to) At top of fin on one end is the bleeder valve - no explanation necessary.
Question#1: What is the "nominal" or "default" position of those knobs - I'm assuming 1/2way. That way rooms needing more heat can just be opened up a little more and those needing less heat can be closed a little. Currently, I have the units upstairs turned fully counter-clockwise - Open as indicated on the knob-, and the units downstairs(closest to the thermostat) halfway open. Please advise.
Question#2: What is function of the flat-head screws in each end-fin of each radiator unit, and how should they be ajdusted.
Notes: Some of these radiators have received multiple coats of paint so turning items in Q#2 will be difficult at best. All radiators get plenty hot, especially this past weekend with lows in the low teens, and are evenly hot - no coldspots.