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ASSE LEC 2012

Listing Evaluation Criteria for Packaged Plumbing and Mechanical Systems for Continuous Microbiological Mitigation

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Organization: ASSE
Publication Date: 1 February 2021
Status: active
Page Count: 24
scope:

Description

This LEC covers PPMS's that are designed to inactivate and disinfect waterborne pathogens and microorganisms within hot water distribution systems from replicating and infecting humans. These PPMS's 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, chemical injection connections, 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 send regular and as-needed 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 UL1995.

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 a minimum cold water inlet temperature of 33 °F (0.5 °C).

Working Pressure

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

Document History

June 1, 2021
Listing Evaluation Criteria for Packaged Plumbing and Mechanical Systems for Continuous Microbiological Mitigation
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....
ASSE LEC 2012
February 1, 2021
Listing Evaluation Criteria for Packaged Plumbing and Mechanical Systems for Continuous Microbiological Mitigation
Description This LEC covers PPMS’s that are designed to inactivate and disinfect waterborne pathogens and microorganisms within hot water distribution systems from replicating and infecting humans....

References

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