Buffer Upper Water Temperature Control

The domestic hot water temperature setpoint is defined as shown in the table below:

Table 2.   DHW Control Setpoint

DHW setpoint

Condition

DHW_TempSp

Auto operation - time schedule

  • DHW_TempSp >= SYS-01: occupied setpoint.
  • DHW_TempSp < SYS-01: un-occupied setpoint

parameter DEX-01

DHW setpoint during extended operation

parameter LEG-01

DHW setpoint during anti-legionella operation

According to the currently-valid Drinking Water Guidelines, the DHW setpoint should be at least 60 °C, to guarantee a minimum circulation temperature of 55 °C.

The calculated setpoint can be increased by the:

The behavior of the internal domestic hot water control signal is shown in the figure below:

Fig. 2.   DHW Temperature Control