22 30 00 PLUMBING EQUIPMENT

.01 Domestic Water Heaters

1. Sizing
1. Caution should be exercised in sizing electric hot water generators located at the Commonwealth Campuses.  The general trend has been for designers to oversize these units.
2. The University prefers to use design criteria obtained from the Werden-Spielvogel report prepared for the Edison Electric Institute Commercial Building Water Heating Research Project (EEI Project RP61).
2. Hot Water Generators
1. The shell of the generator shall be designed for a working pressure of 150 psig and shall bear the ASME code for Unfired Pressure Vessels and shall meet the Commonwealth of Pennsylvania, Department of Labor and Industry regulations.
2. All heating coils of hot water generators installed at the University Park Campus shall be constructed of cupronickel alloy containing 10 percent nickel.
3. Hot water generators shall be a tank type, similar to Patterson Kelley Compact 400 Series.  The unit shall be complete with ASME rated pressure and temperature relief valves, inlet and outlet thermometers, pressure gauges upstream and downstream of the control valve, bronze body circulating pump, condensate strainer, float and thermostatic trap, control valve, vacuum breaker, steam line strainer and all auxiliaries necessary to compose a complete working unit.  Where campus compressed air is available, the steam control valve shall be air-loaded (if air is available).
4. Instantaneous hot water generators shall not be used unless approved in advance by the University.  When approved, instantaneous hot water generators shall contain a cupronickel coil (10 percent nickel) and all the auxiliaries required for the above type generator with the exception of the circulating pump.  The steam control valve on instantaneous hot water generators shall be air-loaded (if air is available) or steam actuated.  Self-contained valves are not accepted.  Instantaneous hot water generators shall be similar to Leslie Constantemp or Aerco.

22 31 00 DOMESTIC WATER SOFTENERS

.01 Water Conditioners

1. The need for water softening shall be determined on an individual project basis and approved by OPP Engineering Services.
2. At University Park Campus, water softening by ion exchange technologies shall be prohibited.  Water treatment for the removal of hardness shall be performed with other technologies, such as reverse osmosis.  

22 32 00 DOMESTIC WATER FILTRATION EQUIPMENT

.01  Water Filtration Devices

1. The need for water filtration shall be determined on an individual project basis.
2. Units shall be similar to Kumo.