scope:

Description

This LEC covers PPMSs that are designed to inactivate and disinfect waterborne pathogens and microorganisms within hot water distribution systems from replicating and infecting humans. These PPMSs include a water heater and distribution mixing valve, or water heater with integral temperature control device, an ultraviolet treatment system that treats incoming and recirculating water, filters, an anti-scaling device, and a connection to drain.

NOTE: The temperature and pressure relief valve required for water heater installations is a part of the water heater sub-assembly.

The PPMS shall include a programmable controller that manages the disinfection and control of the PPMS. The controller includes:

- Ability to generate maintenance alerts;

- Ability to send local and remote alerts;

- Connectivity to external building automation systems (e.g. MODBUS and BACnet).

Connections

Pipe threads and other connections shall conform to the applicable standards.

• Tapered pipe threads shall comply with ASME B1.20.1.

• Dry seal pipe threads shall comply with ASME B1.20.3.

• Compression assemblies shall comply with SAE J512.

• Soldered connections shall comply with ASME B16.18 or ASME B16.22.

• Push fit connections shall comply with ASSE 1061.

• Press connections shall comply with ASME B16.51.

Minimum Heating Capacity

Integral water heaters capacities shall be 399,000 BTU/hr (118kW) and greater. Heating output shall be determined by ANSI Z21.10.3/CSA 4.3 or UL 1995.

Minimum Flow

Minimum hot water delivery flow rate is 5 gpm (18.9 L/min) at a temperature rise of +70 °F (+40 °C).

Minimum Inlet Temperature

The PPMS shall operate with cold water inlet temperature between 33 °F (0.5 °C) and 80°F (27 °C).

Working Pressure

The safety design shall be rated with a maximum allowable working pressure of 150 psi (1034 kPa) or greater.