Heating Conundrums (part the third)

This is becoming quite the serialized mystery tale. Today we had a team of two repairmen out here for 6 hours (they estimated the job would take 4 hours) and we still have not solved the problem.

To recap, our heating system is not heating all the rooms of our house evenly. Some get no heat at all, others are just fine. We've tried bleeding the system completely, bleeding a little out of each baseboard, fixing the piping, turning on/off the pump to different loops--and nothing seems to help. After coming out twice for no charge just to take a look and make some suggestions, this plumber/heating guy proposed a solution that would involve moving the master bedroom loop so that it wasn't fed from a pipe that led to the whole house (thus taking water away from the rest of the system). He would connect that loop directly to the boiler. So that would result in two circuits both coming directly out of the boiler - both with pumps to keep the water moving. While he was at it, he also would install auto-bleeders on both, to reduce the number of air bubbles in the system.

You can see the difference between the left and right pictures how much pipe-work he did. It's easy to recognize what's new, because it's done in shiny copper.

Here's a close-up of the two pumps. He connected them in a way that we could shut the valves above and below them if they should ever need to be replaced.

Each one has a little black box on it to control how much oomph goes into moving the water. Hypothetically, this means we can alter the percentage of hot water to each section, if one side gets warmer than the other.

Here are the fancy new bleeders (you can't quite see them in the first picture, but they're there, hiding behind our service form):

Creating the new loop meant a lot of restructuring down in the basement. They closed off two connections - one each to the main outgoing and incoming/return pipes (circled in red). The new copper pipes represent the new outgoing and return pipes for the new bedroom loop. They aren't attached to the thick, black steel pipes - they go all the way back to the boiler.

They also fixed the little section of pipe that got leaky from our last heating experiment.

This all sounds impressive, right? Well it seemed like it to us. And we were pretty sure this would fix the problem, based on which pipes were hot and which were cold when the system was running. The problem is that after 6 hours of work, our workmen ran the system and........no improvement. SERIOUSLY! We couldn't believe it. They couldn't believe it. The master bedroom still gets no heat.

It was right about then that they realized they'd spent way longer at our house than they were expecting and one of the guy's brother-in-law called to ask for help because the water boiler in his restaurant stopped working. So they asked us to keep experimenting with bleeding the system, didn't charge us, and promised to be back in touch early next week to continue to figure out what to do.

We are starting to wonder if the loop they created never went to the bedroom at all. We all figured that it did, since it was the only cold pipe and the bedroom was the only cold room. The problem is that we are operating by process of elimination. We don't have a schematic for what pipes lead where behind the walls. It isn't really this company's fault, since we thought the same thing. Though we certainly won't be paying up until we get some resolution. I guess this problem remains "to be continued..."