The mechanical rooms in the OGT all have a different layout but all use the same concept. The city's water supply line is the large pipe coming up from the ground into your mechanical room (FIG 1), and generally comes into your unit with a pressure of 85-110 pounds per square inch (PSI). This pipe then splits into two lines -  a smaller pipe and the continuing large pipe (FIG 2). The smaller pipe carries the Domestic Water Supply for your unit, while the larger pipe is the water supply for your unit's Fire Suppression System (Sprinkler System).  It is important to note that you CANNOT TURN OFF the Fire Suppression System (Sprinkler System) AT ANY TIME! (FIG 3).

Some of the pipe layout may vary slightly from one unit to another but the concept is exactly the same.

As the name implies, the Domestic Water Supply provides all water to the unit. As one moves along the DWS pipe, the first thing that you will find is the first, of several water shut-off lever. This lever when opened is parallel to the water pipe. To shut-off the water turn the lever 90 degrees clock-wise. The next item that you will find is the Pressure Reducing Valve (PRV). This valve reduces the incoming city water pressure to approximately 60-70 PSI. After the PRV, you will find the water meter, which measures each unit's water consumption.  Each unit is slightly different in its configurations, however all units will have shut-off levers before the PRV and after the water meter.

The hot water system is composed of the  Hot Water Tank (HWT), the Hot Water Recirculating Pump (HWRP) and a Hot water Expansion Tank (HWET), if installed in your unit. For additional information on the Hot Water System, click HERE.

Learn more about potential leaking issues with the Hot Water Recirculation Pump HERE