I put this up as a place holder for now and throw up a few pictures tonight. I did a walk through of several buildings on a military base over the past two days. This was supposed to be part of an energy retrofit and with the final goal of getting rid of the central utility plant. The plant is old enough that quite a bit of the under ground piping is needing replacement. Were talking miles of piping. This particular plant uses 300 plus degree water at high pressure(super heated hot water). I consider it dangerous as hell. I was at one of the buildings that was under construction and a guy knocked over a piece of pipe and busted off a gauge. Well once this system loses pressure it flashes to steam. In this case everbody made it out of the mech room but it evacuted the whole building and brought in the fire department. I honestly feel safer around high pressure steam than this superheated hot water. Many of these buildings mech systems are in rough shape.
Well after 2 days of walking around I will share some pictures of mainly the controls of some buildings. I'm a control guy so thats what interest me most. The first day I didn't take my camera and didn't start taking pictures until half way through the second. The buildings range from late 70's to a couple year old installations.
Here's when I couldn't take it any more and started taking pictures. This unit has an 06 serial number but I suspect it was installed some time in 07. This is a 40 to 50 ton condensing unit thats serves whole building. Two stories and shaped like and L that the best I can tell is a single zone. Suspect the original design from the 60's but equipment and controls replaced in the mid to late 90's with the brand new condensing unit.
Notice the wires coiled up it the lower left. Those wires are disconected and the wires coming from the controls located in the building. Also notice the transformer sitting there. It has nietehr the line or load hooked up. I also like the blue wires pulled off the factory teminal strip at the top and taped to the white wires flown to the terminal strip on the bottom.
Also complete with gator clipped jumper wires.
Here's a couple pics of the control panel that may or may not be controlling the system at this point. I'm sure it didn't start out looking like this.
Here's some of whats left of the control wiring on the side of the unit.
Heres the return fans starter. This is a three phase fan but notice the three phase starter and the missing center pole one the contactor.
Two things that I also remember about this building that I didn't get pictures of.
1. The hot water coil was not hooked up and the valve was missing. Was told its been like that for atleast 2 years.
2. The supply fan starter had parallel #8 on the load side. If I remember the elec code correctly you can't do parallel feeders under the 1/0 wire size.
Here is another picture I took to show the general state of the mech room.