Dhw Release - Siemens LMS14 User Manual

Release
Building Technologies Division

6.7.4 DHW release

Line no. Operating line
1620 Release
24h/day
Time programs HCs
Time program 4/DHW
When DHW heating is On, the release parameter can be used to determine when –
within a 24-hour period – DHW charging shall take place.
Note!
The time of release does not apply to DHW charging with the electric immersion
heater. A specific parameter is used for release of the electric immersion heater
(refer to chapter Electric immersion heater).
DHW heating can be released in 3 different ways:
24h/day
When this setting is used, DHW heating is continuously released as long as it is On.
The DHW setpoint is always the Nominal setpoint, unless the Legionella function has
been activated. Setting Once/day or Several times/day has no impact. When DHW
heating is Off, the Frost Protection setpoint applies.
Example:
0
Figure 32: DHW release – 24h/day
Time programs HCs
When this setting is used, DHW heating is released during the occupancy times of the
connected heating circuits. If at least one of the heating circuits operates at the Comfort
level, DHW heating is released also. If all heating circuits operate at the Reduced level
or in Protection mode, the DHW level is set to Reduced also.
Note!
Evaluated are the time programs of the heating circuits. If the heating circuits are
switched off due to active ECO functions, DHW release is still maintained.
To ensure that the DHW storage tank is already charged when space heating is
started, the release of DHW heating is brought forward in time against the switch-on
point for space heating (including optimum start control). The extent of forward shift
depends on Charging (5010) (Once/day or Several times/day).
When selecting Once/day, the forward shift for the release of DHW heating is 2.5 hours.
When selecting Several times/day, the forward shift for the release of DHW heating is
1.0 hour.
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6 The settings in detail
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