KSB Calio S, Инструкция по установке и эксплуатации

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7 Operation
37 of 52
Calio S
1157.8117/01-EN
7.3 Functions
7.3.1 Setback operation
Function
If the Setback Operation function is enabled, the pump set identifies minimum heat
demand when the fluid temperature sinks continuously. The pump set automatically
reduces the setpoint by 30 %. When heat demand rises again, the pump set reverts
to its previous setpoint. For applications with small differences between supply
temperature and return temperature disabling the Setback Operation is
recommended (e.g. for underfloor heating systems combined with condensing
boilers or heat pumps).
When the Setback Operation function is active, the pump set switches between night
mode and day mode.
Night mode is active in the following cases:
▪
The fluid temperature sinks by 15 °C within 2 hours.
Day mode is active in the following cases:
▪ The fluid temperature rises by 3 °C.
▪
The pump set has been in night mode for more than 7 hours.
The figure below illustrates an example of the criteria used by the boiler and pump
set to switch between day mode and night mode:
< 2 h
> 15 K
> 3 K
22 6
A
B
C
Fig. 14: Switchover between day mode and night mode
A Boiler mode
B Fluid temperature
C Pump mode