Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Line no. Operating line
4722 Temp diff buffer/HC
If the temperature differential T between buffer storage tank and heat request from the
heating circuit is sufficiently great, the amount of heat required by the heating circuit is
drawn from the buffer storage tank. The heat source is locked.
Note!
When using Temp diff buffer/HC (4722), the mixing valve boost of the heat request
from the heating circuit can be compensated.
B4
E
1K
t
4722
Figure 72: Automatic locks – Temperature difference buffer/heating circuit
Key
Line no. Meaning
4722 Temperature differential of buffer and heating circuit
B4 Buffer sensor
E Heat generation lock
t Time
T Temperature
TVLw Flow temperature setpoint
Line no. Operating line
4724 Min st tank temp heat mode
A minimum buffer storage tank temperature can be set in the parameters for heat
consumers (mixing valves or pump circuits and heat consumers connected via H1/H2).
If the heat source is malfunctioning or locked (or not present), the consumers can be
switched off if the buffer storage tank is too cold.
This function prevents heat consumers from letting their pumps run although no heat is
available.
The heat consumers are locked if the temperature at the warmest sensor in the buffer
storage tank drops by more than 1 K below the minimum level and – at the same time –
no heat source is available. The consumers are released again when the buffer storage
tank temperature returns to the minimum level (or a heat source becomes available).
Note!
Consumers that do not draw their heat from the buffer storage tank are not affected
by this switching off action.
Temp diff buffer/HC
Min st tank temp heat
mode

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English