Heating Help

pump

@ March 6, 2010 2:10 PM in No heat in 2nd floor zone

I did not make myself clear, I did mean that the pump does not run when it is below 20. I meant that the second floor zone does not get circulation when the others turn on. The pump runs, but it starves the second floor. It has been purged by everybody and their brother, that is only a temporary fix.

pump runs

@ March 6, 2010 2:03 PM in No heat in 2nd floor zone

I did not make myself clear, I did not mean the pump doesn't run. What I meant was that the upstairs zone does not get heat in extreme cold weather. The other zones are OK. It seems when all the other zones start up the top zone is starved. It has been purged by everybody, air is not the problem.

gauge

@ March 6, 2010 11:25 AM in No heat in 2nd floor zone

I put it on the zone purge valve on the troublesome zone. I left the valve open of course.

Tested pressure

@ March 6, 2010 11:00 AM in No heat in 2nd floor zone

I put a gauge on the system it showed 8 pounds while it was running. I raised it with the makeup water to 15 it seems to be holding 14 with all the zones running.
I don't know what the pipes are made out of Copper, pex etc. I know the hoses coming out are car radiator types. This house has a another set of under concrete radiant heat pipes that were there from the begining (35) years.
The boiler is a crown AWI162SNST1PSU output 132,000
installed in 2005
I did not own the house when any of this work was done.

pressure

@ March 5, 2010 10:06 PM in No heat in 2nd floor zone

I will get a gauge tomorrow and check it. Do you mean put gage on one of the Boiler drains above the zone valve?
Thanks 

Picture

@ March 5, 2010 8:55 PM in No heat in 2nd floor zone

I am new at this!

Pictures

@ March 5, 2010 8:53 PM in No heat in 2nd floor zone

Pictures for no heat post

No heat in 2nd floor zone

@ March 5, 2010 8:50 PM in No heat in 2nd floor zone

I just bought this house about two months ago. It has four zones one of which was done about two years ago. The original  boiler was replaced in 2005. There have been problems with an upstairs zone since we bought the house.
 
When the temperature gets down to the 20’s the upstairs zone will stop getting circulation. I can purge the system and shut two zones off and it will get working again. Then a few days later it will stop circulating again. I can repeat the above to get it going again.
 
I heard from the gas company who has the repair contract ( they do not work on anything connected with water) that that system has had trouble ever since the fourth zone was added for an addition. It does not appear to get air in the system. Would it be possible that when several zones open at once the pump is not powerful enough to pump the higher second floor?
 
Also the addition has radiant heat under the tiles, I don’t know what is buried in the floors, but there are two manifolds, return and supply of ¾ black iron with three rubber hoses of 5/8 id to each. They look like car radiator hose, I do not know if that is used under the tile. The straight heat that goes to all zones goes there also.
 
Any ideas for a solution? I have had a few heating people look at it but only got vague answers on what is wrong with it.