Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -r27e8758fa6199e72b914e1199786a4396ce74d06 -r61061e547ac63df8f0090cc3a3ba81079c88ce9f
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 27e8758fa6199e72b914e1199786a4396ce74d06)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 61061e547ac63df8f0090cc3a3ba81079c88ce9f)
@@ -19,6 +19,7 @@
 #include "Conductivity.h"
 #include "ConcentratePumps.h"
 #include "DialysatePumps.h"
+#include "DryBiCart.h"
 #include "FpgaDD.h"
 #include "Heaters.h"
 #include "ModeStandby.h"
@@ -41,6 +42,7 @@
 #define BAL_CHAMBER_DATA_PUBLISH_INTERVAL           ( 250 / TASK_GENERAL_INTERVAL )             ///< Interval (ms/task time) at which the balancing chamber data published.
 #define BAL_CHAMBER_FILL_PRES_DROP_MS               ( 200 / TASK_GENERAL_INTERVAL )             ///< Time (ms/tasktime) to confirm the balancing chamber filling started and corrosponding valves opened.
 #define BAL_CHAMBER_FILL_COMPLETE_MS                ( 300 / TASK_GENERAL_INTERVAL )             ///< Time (ms/tasktime) to confirm the balancing chamber fill completed and pressure is within range
+#define DRY_BICARB_CHAMBER_MAX_TIMEOUT_COUNT        ( 20 * SEC_PER_MIN )                        ///< Periodic bicarb chamber fill request.
 
 /// Payload record structure for balancing chamber switch only request
 typedef struct
@@ -71,7 +73,9 @@
 static F32 lastTdDialysateFlowrate;                                                             ///< Previous TD dialysate flow rate
 static F32 freshDialPressure;                                                                   ///< Fresh side dialysate pressure
 static F32 spentDialPressure;                                                                   ///< Spent side dialysate pressure
-
+#ifdef __DRY_BICARB__
+static U32 dryBiCarbChamberFillTimeoutCount;                                                    ///< Counter for checking the timeout for drybicart chamber fill request.
+#endif
 // ********** private function prototypes **********
 
 static BAL_CHAMBER_EXEC_STATE_T handleBalChamberState1FillStart( void );
@@ -125,6 +129,9 @@
     isPressureDroppedDuringFill                 = FALSE;
     freshDialPressure                           = 0.0F;
     spentDialPressure                           = 0.0F;
+#ifdef __DRY_BICARB__
+    dryBiCarbChamberFillTimeoutCount            = 0;
+#endif
 }
 
 /*********************************************************************//**
@@ -192,6 +199,17 @@
     // Increment counter indicating fill is in progress.
     currentBalChamberSwitchingCounter += 1;
 
+#ifdef __DRY_BICARB__
+    //Increment counter for dry bicarb chamber fill
+    dryBiCarbChamberFillTimeoutCount += 1;
+    // Fill bicarb chamber once every 60secs.
+    if ( dryBiCarbChamberFillTimeoutCount >= DRY_BICARB_CHAMBER_MAX_TIMEOUT_COUNT)
+    {
+        setBicarbChamberFillRequested();
+        dryBiCarbChamberFillTimeoutCount = 0;
+    }
+#endif
+
     // execute current balancing chamber exec state
     switch ( balChamberExecState )
     {