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Return preheating
Arrangement / Opt. functions / Add new function / Return preheating
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Relay
Relay selection
system dependent
system dependent
Sen. Return Return sensor selection
system dependent
system dependent
Sen. HS
Heat source sensor selection system dependent
system dependent
D
Ton
Switch-on temperature
difference
2.0 … 30.0 K
6.0 K
D
Toff
Switch-off temperature
difference
1.0 … 29.0 K
4.0 K
Summer off Summer switch-off option
Yes, No
No
Sensor
Outdoor sensor selection
system dependent
system dependent*
Toff
Switch-off temperature
10 ... 60 °C
20 °C*
Funct.
Activation / Deactivation
Activated, Deactivated Deactivated
* When a heating circuit has been activated, the value adjusted in the corre-
sponding parameter in the heating circuit menu is adopted as factory setting.
The Return preheating function can be used for transferring heat from a heat
source to the heating circuit return.
The allocated relay is energised when both switch-on conditions are fulfi lled:
• the temperature difference between the allocated sensors has exceeded the
switch-on temperature difference
• the temperature at the outdoor temperature sensor has fallen below the
adjusted outdoor temperature
With the summer switch-off option, the return preheating can be suppressed out-
side the heating period. If the heating circuit concerned is controlled by the con-
troller, the adjustments automatically adapt to the heating circuit.
Heat source
sensor
Relay
Return
sensor
Summary of Contents for SC5.14
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