Plumbing: I cant water to come out of my hot water line for my tub to chlorinate the line. Need help fast!?

I am trying to flush and chlorinate the water lines at my new house to get my permit from the health dept. Everything went perfect and all the lines flowed and flushed ok except for the hot water line to supply a freestanding clawfoot tub. I have a shut off valve on the pipe stub coming out of the wall. The cold water flushed ok here, but I get a little hiss of air and maybe a trickle of water out of the hot side and nothing else. I remembered that there is a pressure balance valve plumbed inline behind the drywall there. I had taken a picture of it so I have a picture I can send from my phone to someone that can help. It looks like each line has a dual check valve before the pressure valve, and they look to be installed in the correct position. The valve is a precision plumbing products tempera trb-2 automatic pressure compensating valve according to the cut sheet left by the rough-in plumber. The picture on their website does not 100% match what my valve looks like. I guess I need to know if I have a defective valve, if the valve has a stop screw that should have been opened before drywall, or if there is a procedure to follow in turning on the water pressure to get the valve to work and let water through the hot side. I have the hot water heater off, and the hot water shut off is actually on the return side of the recirculation line, but I can shut off the whole house after the expansion tank. The cold water has a shut off past the t for the hot water so I can shut it down by itself. I also t-ed the hot and cold together in another bathroom to be able to pressure test the whole house. Would that affect anything? Help! If I have to tear the wall out, I have to rip out bead board paneling and all the baseboard that is installed and perfect. The lines then go into the floor, which is tiled and grouted. I also do not have internet access to be able to check in once I go up to the construction site. If someone knows possibly what my problem is and can give me advice asap, my cel phone is 410-322-9278. I would so greatly appreciate the help. I need this rectified immediately and dont know what else to do! Thanks, Patrick