In this page you can find a detailed description of "It's 5 o'clock" achievement that you can unlock in Get Even. You get this trophy for bringing John Keating, one of the hospital's patients, some water.
You get the chance to solve this puzzle when you visit the Asylum's block C as Black for the first time. However, there is a requirement - YOU CAN'T RELEASE any patients during your previous two visits in the Asylum (in two different parts of the building B). Only then, in one of the block C rooms, you can meet John Keating (otherwise he would be killed). Listen to his short speach from which you learn that you need to solve his new puzzle.
In this puzzle you must interact with nearby valves in a such way that the water will start running in Keating's room. The first valve is right from the glass entrance to Keating's room. Turn it. You can also use thermal vision in your phone. By doing that you will receive an acknowledgment that water started to run in this pipe.
You can start exploring the area and, on your way, you can search for all interactive tracks that were mentioned in the variant A (objects that can be collected or scanned). Reach the stairs and go on the floor. There, you must head to the room with a few valves which is presented in the picture. Turn the valves in the order presented in the picture and by doing that the water will start running.
Now you must go to one of the smaller adjacent rooms. There, you can find a single valve (the picture above).
Finally, you must return to the ground floor and look at the sink presented in the picture. Open the door below it and turn the last valve. For this action you receive the trophy.