TRVs on a slightly oversized boiler?

JH_2

Hi All-



A couple of months back I came here for advice on my system:

<a href="http://www.heatinghelp.com/forum-thread/127286/Steam-experts-how-does-this-install-look">http://www.heatinghelp.com/forum-thread/127286/Steam-experts-how-does-this-install-look</a>



Based on your responses I made a lot of improvements that really worked wonders.

- I found a good local  steam guy to install the missing indirect limit controller  and tuneup the boiler.

- I insulated all my mains and installed new main vents per Steamheads suggestion

- I fixed the pitch of some radiators that were sloped wrong due to settled floors

- I rebalanced all the radiator vents using the venting chart

- I replaced the thermostat (they had a cheap model that didn't have steam settings)



So far so good, house heats much faster now and thankfully its not short cycling even though we measured the boiler at 40% oversize.



However I still have a couple of minor issues. The biggest concern is that the 2nd floor overheats  on a long heat call. I've tried really slow vents on those radiators so the first floor heats longer, but its not enough.  Now I'm considering installing TRVs on the 2 radiators up there to address this.



My question is:   Is there any downside to installing TRVs on the second floor radiators to control overheating?  Would they possibly cause short cycling?

(The 2nd floor radiators are about 25% of the total house EDR)



Thanks,

Jeremy