Siemens LMS14 User Manual page 148

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Building Technologies Division
Note!
If using Funct input EX21 module x (6024, 6026, 6028) Limit thermostat HC on an
extension module, please note that the heating circuit actuator (where applicable:
valve) is switched off directly by the extension module.
When switching off by the limit thermostat becomes inactive again, the delayed heat
request remains inactive so that the heat source resumes operation before an
installed heating circuit valve releases the heating circuit.
Note!
For the instantaneous water heater, it can be selected whether the residual heat
resulting from overrun shall be delivered to the instantaneous water heater or the
heating circuits – Overrun via InstWH
the delayed heat request becomes inactive.
If the heat resulting from overrun is supplied to the heating circuit, the heating circuit's
actuating element must first be opened. If it is a valve, it might not be possible to
supply the residual heat to that heating circuit.
Note!
For the DHW diverting valve, parameter Pump off change div valve (5732) can be
used to set the period of time the pump shall be off. Using Delay pump off (5733), a
time shift between pump shutdown and control of the diverting valve can be
parameterized.
To ensure the heating circuit's actuating element releases the heating circuit before
the heat source is put into operation, parameter Delay heat request (746, 1046,
1346) must be increased by the amount of time the DHW diverting valve requires to
change over.
Note!
Parameter Delay heat request (746, 1046, 1346) is used to delay the heat request of
the respective heating circuit to the heat source while the valve is already controlled.
If the heat request results from a special function of the heat source (e.g. Chimney
sweep function), the delay becomes inactive. In this case, parameter Delay heat
request special op (2470) must be set as well.
User Manual LMS14...
6 The settings in detail
5489). When supplied to the heating circuits,
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CC1U7471en
07.05.2014