Siemens LMS14 User Manual page 360

DHW operating modes
Frost protection
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Building Technologies Division
In the case of DHW systems with instantaneous water heater, the following operating
modes can be selected via operating mode changeover (operator terminal/room unit):

DHW mode Off (no bar on the display)

DHW mode ECO On (single bar on the display)

DHW mode On (double bar on the display)
When selecting DHW mode Off, frost protection for DHW remains activated. With DHW
mode ECO On, DHW heating is activated, but Keep hot operation is deactivated. In
general, Keep hot operation is only enabled with DHW mode On.
In operating mode Off, frost protection for DHW remains active.
Frost protection becomes active as soon as the temperature acquired by sensor B38
drops below 5 °C.
In that case, a heat request is sent to the burner.
The temperature setpoint for the burner is generated by adding the parameterized Flow
setpoint boost (5420) to the Setpoint keep hot (5460).
Frost protection is ended when the temperature acquired by sensor B38 reaches a
level of least 7 °C.
When frost protection is ended, pump overrun starts.
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015