The setpoint for the differential pressure controller (SpDiffP) is supplied by a client tool, e.g. ABT Go or an automation station. The primary differential pressure (configuration 1: DiffPPrim / configuration 2: PrDiffPPrim) serves as a control variable to the differential pressure controller and directly controls the valve position.
Function overview
In the control mode "Differential pressure control" the following functions are available:
Maximum volume flow limit
Intelligent Valve is an ePICV (PICV = pressure independent control valve) – i.e. it is fundamental that the maximum volume flow is independent of the current operating mode. The maximum volume flow limitation is always activated.
The setting is done via the object VflMax:
- Default: Nominal volume flow of the specific valve type V100 = VflNomVlv
- Setting range: 5…100 % of V100
Self-test
A self-test is performed during the hydronic balancing. The self-test can be initiated and stopped via ABT Go or by pressing the SVC button.
- During this time, the SVC LED flashes blue.
The following criteria are tested, and a corresponding report can be generated:
- Flow sensor
- Max. volume flow
- Differential pressure at max. volume flow
- Valve position at max. volume flow
- Leakage rate
Forced max. volume flow
This function temporarily overrides the present setpoint. The valve supplies 10 minutes of maximum volume flow (VflMax) when the function is enabled.
- During this time, the SVC LED flashes yellow.
- Self-tests are not possible while this function is active.
The function can be started as well as stopped via ABT Go or the SVC button.