Siemens AVS75.39 Series User Manual page 163

Siemens
Building Technologies
Error message/alarm (digital)
By closing input Hx, an external error message can be forwarded and displayed.
Consumer request CC1 and CC2 (Digital)
When input Hx closes, a consumer request (heating or cooling) is forwarded to the
controller. The flow setpoint for the corresponding consumer circuit is controlled to
the value set for the consumer request (OL1859 or 1909).
A voltage-proportional demand for heat occurs via the setting "Cons request 10V
for CC1 and CC2.
Enable swimming pool source (Digital)
Closing input Hx (e.g. manual switch) causes the heat source to release the
swimming pool heater.
Overtemperature dissipation (Digital)
Active dissipation of excessive heat enables consumers (heating circuit, DHW
storage tank, Hx pump) to draw excessive heat by delivering a forced signal.
The parameter "Excessive heat draw" can be used to determine for every
consumer whether or not it should take account of the "forced" signal, and hence
whether or not that consumer should participate in the dissipation of heat.
Local effect
When using LPB device address 0 or >1, excessive heat dissipation only acts on
the local consumers connected to the controller.
Central effect (LPB)
When using LPB device address = 1, excessive heat dissipation also acts on the
consumers connected to the other controllers in the same segment.
The distribution of excessive heat from segment 0 across other segments of the
system is not possible.
Release swimming pool solar (digital)
You can externally (e.g. manual switch) release the solar swimming pool heater
through the use of one Hx input.
Using two Hx inputs allows you to set the charge priority for the swimming pool
heater versus the storage tank.
(For a description of the function, refer to operating line 2065 "Charging priority
solar").
Operational level HC1, HC2, HC3 (digital)
Closing the corresponding contact changeover the operating mode to "Reduced" if
the selected heating circuit is in "Automatic" operating mode.
When the contact closes, cooling circuit 1 changes from "Automatic" mode to "Off".
The setting can be used to control the heating circuits/cooling circuit via an external
time switch, for instance.
Room thermostats HC1, HC2, HC3 (Digital)
A connected room thermostat transmit the "demand" or "no demand" signal to the
H input.
In comfort, a heat request is triggered upon demand from the room thermostat for
the corresponding heating circuit to the setpoint selected under "Flow step room
thermostat" (see line 742 for HC1, 1042 for HC2 and 1342 for HC3).
User manual RVS43.345
The settings in detail
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CE1U2354en_021
2013-09-02