Fix case w/o secondary flow sensor

Author: AntoineGautier

Buildings/Templates/Plants/Boilers/HotWater/Components/Interfaces/PartialController.mo

@@ -44,6 +44,7 @@ block PartialController
             Buildings.Templates.Plants.Boilers.HotWater.Types.PumpsSecondary.None
           and (cfg.have_boiCon and cfg.have_pumHeaWatPriVarCon
           or cfg.have_boiNon and cfg.have_pumHeaWatPriVarNon)));
+  // At least one flow sensor is needed, either in primary or secondary loop for staging.
   final parameter Boolean have_senVHeaWatPriCon =
     cfg.have_boiCon
       and (if cfg.have_pumHeaWatPriVarCon and
@@ -176,6 +177,13 @@ block PartialController
       iconTransformation(extent={{-20,-20},{20,20}},
         rotation=-90,
         origin={100,-60})));
+  Buildings.Controls.OBC.CDL.Routing.RealExtractSignal VHeaWatSec_flow(
+    nin=cfg.nLooHeaWatSec,
+    nout=cfg.nLooHeaWatSec)
+    if cfg.typPumHeaWatSec <>
+      Buildings.Templates.Plants.Boilers.HotWater.Types.PumpsSecondary.None
+    "Secondary HW flow (handles none, single or multiple sensors)"
+    annotation(Placement(transformation(extent={{-210,-90},{-190,-70}})));
   protected
   Buildings.Templates.Components.Interfaces.Bus busBoiCon[cfg.nBoiCon]
     if cfg.have_boiCon
@@ -273,6 +281,14 @@ equation
     annotation(Line(points={{-160,200},{-180,200},{-180,0},{-260,0}},
       color={255,204,51},
       thickness=0.5));
+  // HACK: Using an explicit range for bus.VHeaWatSec_flow avoids Dymola's warning
+  // "Note: since there are connections to elements of pla.bus.VHeaWatSec_flow[]
+  // we have to expand pla.boiCon.bus.VHeaWatSec_flow[] (which is connected to it)."
+  connect(bus.VHeaWatSec_flow[1:cfg.nLooHeaWatSec], VHeaWatSec_flow.u)
+    annotation (Line(
+      points={{-260,0},{-260,-14},{-240,-14},{-240,-80},{-212,-80}},
+      color={255,204,51},
+      thickness=0.5));
 annotation(Icon(coordinateSystem(preserveAspectRatio=false)),
   Diagram(coordinateSystem(preserveAspectRatio=false,
     extent={{-260,-280},{260,280}},