Alan if you are a tennant why worry. If you are the owner or manager
you need to balance the system from top to bottom, time consuming, but
as an owner it will save alot of money from not overheating areas.
First get your self a good IR thermometer like Rayteck not
Radioshack, Rayteck reads the same tenp trigger to trigger, Radio Shack
can vary 3 degrees on the same site. And 2 thermometers at least for
each apartment that can be calibrated to one master by sliding the bulb,
cheap Taylors. Mount them in the same location and same hight in each
apt and record every room at same time walking through the building.
This will show your imbalance.
If it is an apt you don`t want tennants to be able to control the
vents so Gortons are good. Gortons come in many grades of venting, maybe
5. 2-3-4-5-C-D. You realy need the same design everywhere as in all
Gorton or cross refrence the venting #. Cheap chinese are junk and don`t
close evenly even though they cross refrence. D should only be used in
difficult to heat areas as a last resort. Basicly it means taking a hot
area and throttle it down to a smaller size and a cold area go larger.
Since you have Ds in cold areas get smaller upstairs, What is upstairs
now. Dole, Gorton ? Buy a range of 3- 4 -5 -C and start to lower the
upstairs till the heat is more even. Also the main and return boiler
feeds could have bad vents. Is the area hard to heat nearby or at the
end, main venting will do this. It is a trial and error process.
Removing radiators is a last resort that should have not been done yet
as it imbalances everything. Also when you lower upstairs heat you will
force more to the first floor through the Ds. You may end up removing
the Ds also. It can take weeks of everyday checking and changing vents,
be sure to keep a log of every apt and every change and temp
differential noted as to where you started and results so you are not
guessing. I just did my 16 unit it started with 10 degree differential
now it is 2. With steam it never will be perfect and will vary from when
it is -10 to 50f on eveness. A pro would charge alot for this as it is
extremely time consuming and detailed work. What vents are in the
building now? You need a list before you realy start to know what you
need to replace. There are adjustable Dole 1-10, but the resident usualy
cranks them then opens a window.
Old vents can be soaked in vinegar it usualy frees them up. Anything
stronger like CLR can eat the plating.