AS 4032.4:2014 Water supply—Valves for the control of heated water supply temperatures
4.4.2 Cold water isolation
When tested in accordance with Appendix D, the thermal shut-off under cold water isolation of each thermostatic tap, when pre-adjusted to supply mixed water at temperatures of 38 ±1°C, 45 ±1°C and the manufacturer’s nominated maximum setting, shall not exceed the temperature rises and durations given in Table 4.1 during both the period of shut-off of the cold water supply and immediately following the restoration of the cold water supply.The mixed water shall stabilize to within 2°C of the preset temperature, in not more than 20.0 s following restoration of the cold water supply.
4.4.3 Heated water isolation
When tested in accordance with Appendix D, the thermal shut-off under heated water isolation of each thermostatic tap, when pre-adjusted to supply mixed water at temperatures of 38 ±1°C, 45 ±1°C and the manufacturer’s nominated maximum setting, shall not exceed the temperature rises and durations given in Table 4.1.
The amount of water discharged following thermal shut-off under heated water isolation of each thermostatic tap shall not exceed 0.75 L within 5–35 s following heated water supply isolation.
The mixed water shall stabilize to within 2°C of the preset temperature, in not more than 20.0 s following restoration of the heated water supply.
4.4.4 Electronic taps—Power failure
If electrical power is not available when outlet water flow commences, the outlet water temperature shall not exceed 50°C.
If electrical power failure occurs while the tap is delivering water, then the outlet water temperature shall not exceed 50°C under steady supply pressures and temperatures (see Appendix D).
4.5 MIXED WATER TEMPERATURE OVERSHOOT ON STARTING FROM AMBIENT
When tested in accordance with Appendix E, the mixed water temperature overshoot,starting from ambient for each thermostatic tap when pre-adjusted to supply mixed water at temperatures of 38 ±1°C, 45 ±1°C and the manufacturer’s nominated maximum setting,shall not exceed the temperature rises and durations given in Table 4.1.
4.6 TEMPERATURE STABILITY OF MIXED WATER
When tested in accordance with Appendix F, at the prescribed flow rates (see Table D1,Appendix D), the temperature of the mixed water shall stabilize to within 2°C of the preset temperature, in not more than 20.0 s following an applied change in the water supply
conditions.
The duration of temporary rises in the temperature of the mixed water, within the 20.0 s stabilization period, shall not exceed the values given in Table 4.1.