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Heat Timer MPC Gold issues in 1 pipe steam multifamily coop
Before I get to the problem, I need to provide a short history... I manage a 40-unit coop building in northern Manhattan that is 100 years old. We have a 1-pipe steam system powered by an HB Smith 28 series 12 section boiler installed in 2002 with Heat Timer MPC Gold controls. The system has worked very well for us until last November when an apartment on the top (5th) floor complained of no or very little heat. The super changed all the valves which made no difference. The only way the apartment would get heat was to put the boiler on bypass and heat the heck out of the whole building which obviously is not sustainable. Thinking it was a distribution issue, we hired a company to:
-install master vents at the end of each main in the basement
-install a new operating pressure control for the boiler
-vent the risers in each of the top floor apartments (2 per apartment) with Gorton D vents
-Install a Gorton D vent before the radiator shut off valve on each of the radiators in the 8 top floor apartments.
It was also recommended that we install Hoffman #40 vents and TRVs on ALL of the building's radiators. We chose to hold off on these measures due to cost and until we could see how the master and top floor venting performed. The results were dramatic. The problem apartment was now toasty and we were able to ease back the controls so our boiler was running less. Of course now that the problematic unit was getting heated, most of the other apartments were being overheated leading to open window syndrome.
We looked closer at our heat timer and realized that the indoor heating sensor is located in the boiler room on the wet return line! The manual states that this sensor should be installed on the last radiator in the system to get warm. Unfortunately we have overlooked this major oversight for MANY years and we need it corrected. Furthermore, the heat timer does not seem to be calibrated well which is no surprise since no one has really touched it since it was installed. I would really like to bring in an experienced controls/steam heat person who can install a new sensor for us and calibrate the Heat Timer which I believe is the missing piece to our solution. Any thoughts on all of the above or recommendations on NYC and environs companies or individuals are welcome. Thanks guys!