scope:

Description

These devices shall consist of a hot water inlet connection, a cold water inlet connection, a mixed water outlet connection, a temperature controlling element and a means for adjusting the mixed water outlet temperature while in service. The device shall also have a means to limit the maximum outlet temperature under normal operating conditions. Provisions shall be made so that the temperature cannot be inadvertently adjusted.

Connections

Pipe threads and other connections shall conform to 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 J 512.

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

Push fit connections shall comply with ASSE 1061.

Minimum Flow

Devices covered by this standard are for plumbed emergency equipment with a minimum flow rate of 1.5 GPM (5.7 L/m).

Maximum Working Pressure

The device shall be designed to function at a working pressure of 125.0 psi (861.9 kPa) or greater.

Temperature Range

Inlet Water Temperature Range

The hot water inlet temperature range shall be 120.0 °F to 180.0 °F (48.9 °C to 82.2 °C) and the cold water inlet temperature range shall be 40.0 °F to 70.0 °F (4.4 °C to 21.1 °C). The cold water supply shall be at least 10.0 °F (5.5 °C) lower than the outlet water temperature setting.

Outlet Water Temperature Range

The device shall be capable of supplying the emergency fixture with an adjustable range, a portion of which falls within 65.0 °F to 95.0 °F (18.3 °C to 35.0 °C). The outlet temperature shall not exceed 100.0 °F (37.8 °C) under normal operating conditions.

Hot Water Failure

Upon hot water failure, for valves rated less than 20.0 GPM (75.7 L/m), the cold water shall continue to flow at a minimum of 1.5 GPM (5.7 L/m) or the manufacturer's rated by-pass flow rate, whichever is greater, at 30.0 psi (206.9 kPa) differential pressure.

For valves rated at 20.0 GPM (75.7 L/m) or higher, the cold water shall continue to flow at a minimum of 15.0 GPM (56.9 L/m) or the manufacturer's rated by-pass flow rate, whichever is greater, at 30.0 psi (206.9 kPa) differential pressure.

Cold Water Failure

Upon cold water failure, the outlet temperature shall not exceed 100.0 °F (37.8 °C) prior to the reduction of the flow to the values listed in Table 1 and the hot water shall continue to flow at a rate not to exceed the values listed in Table 1.

Cross Flow

The device shall include a means of preventing cross flow.