Supplementary Source - Siemens AVS75.39 Series User Manual

Control on flow
temperature control
sensor
Operating mode
Setpoint incr main source
Output limit main source
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Siemens
Building Technologies
6.11

Supplementary source

Supplementary generation can be operated as a supplement to main generation
(boiler).
Release of supplementary generation depends on various parameters which are
explained in detail in the next few pages.
The release occurs via relay release K27.
2-point control occurs via the control relay K32.
The control of the enabled supplementary generation is based on the temperature
deviation on the selected control sensor (flow temperature sensor B10 or buffer
storage tank sensor B4, see line 3725).
Release relay K27 and control relay K32 are switched on if the temperature on the
control sensor drops below the setpoint by 5°C. An integrated switch (line 3720) if
set, must be fulfilled after dropping below 5°C.
Control relay K32 is immediately switched off if the temperature on the control
sensor exceeds the setpoint by the "Switching differential" (line 3722) and the
release relay K27 drops off after the overrun time expires.
Line no. Operating line
3690 Setpoint incr main source
3691 Ouput limit main source
3692 With DHW charging
Locked ¦ Substitute ¦ Complement ¦ Instantly
3694 OT limits with DHW
Locked ¦ Note
For the period of time the supplementary source is released, the setpoint of the
main generator is increased by the value set here, ensuring that it is not switched
off or that the degree of modulation is not reduced.
This prevents the main generator from reducing its output when the supplementary
source is in operation.
When locking the supplementary source, the setpoint of the main source is
continuously shifted again to its own setpoint.
The supplementary source is only released if the main source exceeds the entered
output [%]. This prevents switching on the supplementary source the main source
is modulating at a lower output.
The lock period only starts if the main source exceeds the set output in
percentages.
User manual RVS43.345
The settings in detail
CE1U2354en_021
2013-09-02