Index: firmware/App/Modes/ModeChemicalDisinfect.c
===================================================================
diff -u -re8f6f5fda0c67cd09a0a7968e3cf305691e75101 -r135b257c835e406f036dfbdec1d8cd9c51e1c526
--- firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision e8f6f5fda0c67cd09a0a7968e3cf305691e75101)
+++ firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 135b257c835e406f036dfbdec1d8cd9c51e1c526)
@@ -8,7 +8,7 @@
 * @file    ModeChemicalDisinfect.c
 *
 * @author  (last)      Dara Navaei
-* @date    (last)      11-Jan-2023
+* @date    (last)      27-Feb-2023
 *
 * @author  (original)  Sean
 * @date    (original)  04-Apr-2020
@@ -178,6 +178,14 @@
 static DISINFECT_NV_OPS_T disinfectNVOps;                                                                      ///< Disinfect non-volatile memory operations.
 static BOOL haveDrainParamsBeenInit[ NUM_OF_DG_RESERVOIRS ];                                                   ///< Boolean flag to indicate whether the drain parameters have been reset or not.
 
+#ifndef _RELEASE_
+/* Nelson Labs is in charge of testing the efficacy of the disinfects (heat and chem). The codes that contain the name Nelson are used to
+ * support the special conditions that are needed to be created to test the disinfects. The support codes are not compiled in a release
+ * build.
+ */
+static NELSON_SUPPORT_T nelsonSupport;                                                                         // Nelson support.
+#endif
+
 // ********** private function prototypes **********
 
 static DG_CHEM_DISINFECT_STATE_T handleChemicalDisinfectStartState( void );
@@ -207,6 +215,10 @@
 static void monitorModeChemicalDisinfect( void );
 static void writeDisinfectDataToNV( DG_USAGE_INFO_ITEMS_T info );
 
+#ifndef _RELEASE_
+static void setNelsonSupportConditions( void );
+#endif
+
 /*********************************************************************//**
  * @brief
  * The initChemicalDisinfectMode function initializes the chemical
@@ -237,7 +249,7 @@
 
     chemDisinfectState                         = DG_CHEM_DISINFECT_STATE_START;
     prevChemDisinfectState                     = DG_CHEM_DISINFECT_STATE_START;
-    stateTimer                                 = 0;
+    stateTimer                                 = getMSTimerCount();
     isThisLastDrain                            = FALSE;
     stateTrialCounter                          = 0;
     rsrvr1Status                               = NUM_OF_DG_RESERVOIR_STATUS;
@@ -261,15 +273,20 @@
     alarmDetectedPendingTrigger                = ALARM_ID_NO_ALARM;
     flushCircWaitTime                          = 0;
     flushDisinfectantWaitTime                  = 0;
-    primeAcidSteadyStateCounter                = 0;
     rsrvrFillStableTimeCounter                 = 0;
     rsrvrFillToFullStableTimeCounter           = 0;
     R1FullVolume                               = 0.0F;
     R2FullVolume                               = 0.0F;
     disinfectantMixRatio                       = 0.0F;
 
+#ifndef _RELEASE_
+    setNelsonSupportConditions();
+#endif
+
     initPersistentAlarm( ALARM_ID_DG_CHEM_DISINFECT_TARGET_TEMP_OUT_OF_RANGE, DISINFECT_TEMP_OUT_OF_RANGE_TIMEOUT_MS, DISINFECT_TEMP_OUT_OF_RANGE_TIMEOUT_MS );
     initPersistentAlarm( ALARM_ID_DG_CHEM_DISINFECT_TARGET_COND_OUT_OF_RANGE, DISINFECT_COND_OUT_OF_RANGE_TIMEOUT_MS, DISINFECT_COND_OUT_OF_RANGE_TIMEOUT_MS );
+
+    requestConcentratePumpOff( CONCENTRATEPUMPS_CP1_ACID, PARK_CONC_PUMPS );
 }
 
 /*********************************************************************//**
@@ -289,7 +306,12 @@
 
     setCPLDCleanLEDColor( CPLD_CLEAN_LED_YELLOW );
 
-    activateAlarmNoData( ALARM_ID_DG_CHEM_DISINFECT_INSERT_ACID );
+#ifndef _RELEASE_
+    if ( nelsonSupport != NELSON_CHEM_DISINFECT )
+#endif
+    {
+        activateAlarmNoData( ALARM_ID_DG_CHEM_DISINFECT_INSERT_ACID );
+    }
 
     return chemDisinfectState;
 }
@@ -556,6 +578,7 @@
             setValveState( VPI, VALVE_STATE_OPEN );
             setValveState( VPO, VALVE_STATE_NOFILL_C_TO_NO );
             turnOnUVReactor( INLET_UV_REACTOR );
+
             stateTrialCounter = 0;
             stateTimer        = getMSTimerCount();
             state             = DG_CHEM_DISINFECT_STATE_FLUSH_DRAIN;
@@ -598,6 +621,7 @@
         startHeater( DG_PRIMARY_HEATER );
         // The UV reactors will be on for the entire disinfect cycle
         turnOnUVReactor( OUTLET_UV_REACTOR );
+
         flushCircWaitTime = FLUSH_CICRCULATION_INITIAL_WAIT_TIME_MS;
         stateTimer        = getMSTimerCount();
         state             = DG_CHEM_DISINFECT_STATE_FLUSH_CIRCULATION;
@@ -661,7 +685,7 @@
         }
 
         // Check if any of the temperature sensors are out of tolerance
-        if( ( TRUE == isTPoOut ) || ( TRUE == isTD2Out ) || ( TRUE == isCD2Out ) || ( TRUE == isCPoOut) )
+        if( ( TRUE == isTPoOut ) || ( TRUE == isTD2Out ) || ( TRUE == isCD2Out ) || ( TRUE == isCPoOut ) )
         {
             // Check if we have exceeded the number of trials. If not, try another time
             ++stateTrialCounter;
@@ -726,7 +750,8 @@
     handleDisinfectantMixing( getMeasuredFlowRateLPM( RO_FLOW_SENSOR ) * ML_PER_LITER, disinfectantMixRatio );
 
 #ifndef _RELEASE_
-    if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_DISINFECT_CONDUCTIVITY_CHECK ) != SW_CONFIG_ENABLE_VALUE )
+    if ( ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_DISINFECT_CONDUCTIVITY_CHECK ) != SW_CONFIG_ENABLE_VALUE ) &&
+         ( nelsonSupport != NELSON_CHEM_DISINFECT ) )
 #endif
     {
         if ( cd2Conductivity < MIN_PRIME_ACID_CONDUCTIVITY_US_PER_CM )
@@ -1061,6 +1086,14 @@
             chemDisinfectUIState = CHEM_DISINFECT_UI_STATE_FLUSH_AFTER_DISINFECT;
             stateTimer           = getMSTimerCount();
             state                = DG_CHEM_DISINFECT_STATE_DRAIN_R1;
+
+#ifndef _RELEASE_
+            if ( NELSON_CHEM_DISINFECT == nelsonSupport )
+            {
+                deenergizeActuators( NO_PARK_CONC_PUMPS );
+                state = DG_CHEM_DISINFECT_STATE_COMPLETE;
+            }
+#endif
         }
         else
         {
@@ -1238,7 +1271,17 @@
 
     chemDisinfectUIState = CHEM_DISINFECT_UI_STATE_COMPLETE;
 
-    requestNewOperationMode( DG_MODE_CHFL );
+#ifndef _RELEASE_
+    if ( nelsonSupport != NELSON_NONE )
+    {
+        nelsonSupport = NELSON_NONE;
+        requestNewOperationMode( DG_MODE_STAN );
+    }
+    else
+#endif
+    {
+        requestNewOperationMode( DG_MODE_CHFL );
+    }
 
     return state;
 }
@@ -1259,6 +1302,7 @@
     {
         SET_ALARM_WITH_1_U32_DATA( alarmDetectedPendingTrigger, prevChemDisinfectState )
     }
+
     requestNewOperationMode( DG_MODE_FAUL );
 }
 
@@ -1569,9 +1613,9 @@
         }
         else
         {
-            uiData.chemDisinfectCountdownTime = 0.0;
-            data.R1FillLevel                  = 0.0;
-            data.R2FillLevel                  = 0.0;
+            uiData.chemDisinfectCountdownTime = 0.0F;
+            data.R1FillLevel                  = 0.0F;
+            data.R2FillLevel                  = 0.0F;
         }
 
         data.chemDisinfectUIState             = chemDisinfectUIState;
@@ -1632,7 +1676,7 @@
     }
 
 #ifndef _RELEASE_
-    if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_CAPS_MONITOR ) != SW_CONFIG_ENABLE_VALUE )
+    if ( ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_CAPS_MONITOR ) != SW_CONFIG_ENABLE_VALUE ) && ( NELSON_NONE == nelsonSupport ) )
 #endif
     {
         // If the dialysate cap is open during any state, alarm
@@ -1697,3 +1741,66 @@
 }
 
 /**@}*/
+
+// ********** Nelson Support Functions **********
+
+#ifndef _RELEASE_
+/*********************************************************************//**
+ * @brief
+ * The setNelsonSupportMode function sets the requested Nelson support
+ * mode (i.e. inoculate, ...)
+ * @details Inputs: none
+ * @details Outputs: nelsonSupport
+ * @param support the type Nelson support (i.e. inoculate, heat disinfect)
+ * @return none
+ *************************************************************************/
+void setChemNelsonSupportMode( NELSON_SUPPORT_T support )
+{
+    nelsonSupport = support;
+}
+#endif
+
+#ifndef _RELEASE_
+/*********************************************************************//**
+ * @brief
+ * The setNelsonSupportConditions function sets the disinfect variables for
+ * Nelson support.
+ * @details Inputs: nelsonSupport
+ * @details Outputs: chemDisinfectState, flushCircWaitTime, stateTimer
+ * @return: none
+ *************************************************************************/
+static void setNelsonSupportConditions( void )
+{
+    switch ( nelsonSupport )
+    {
+        case NELSON_CHEM_DISINFECT:
+            // Set the valves to start flush circulation
+            setValveState( VPI, VALVE_STATE_OPEN );
+            setValveState( VBF, VALVE_STATE_CLOSED );
+            setValveState( VPD, VALVE_STATE_OPEN_C_TO_NC );
+            setValveState( VDR, VALVE_STATE_DRAIN_C_TO_NO );
+            setValveState( VRC, VALVE_STATE_DRAIN_C_TO_NO );
+            setValveState( VPO, VALVE_STATE_NOFILL_C_TO_NO );
+            setValveState( VRF, VALVE_STATE_R2_C_TO_NO );
+            setValveState( VRO, VALVE_STATE_R1_C_TO_NO );
+            setValveState( VRI, VALVE_STATE_R1_C_TO_NO );
+            setValveState( VRD1, VALVE_STATE_CLOSED );
+            setValveState( VRD2, VALVE_STATE_CLOSED );
+            setROPumpTargetFlowRateLPM( RO_PUMP_TARGET_FLUSH_FLOW_RATE_LPM, MAX_RO_PUMP_FLUSH_FILL_PRESSURE_PSI );
+            setHeaterTargetTemperature( DG_PRIMARY_HEATER, CHEM_DISINFECT_HEATER_CONTROL_TEMPERATURE_C );
+            startHeater( DG_PRIMARY_HEATER );
+            turnOnUVReactor( INLET_UV_REACTOR );
+            turnOnUVReactor( OUTLET_UV_REACTOR );
+
+            flushCircWaitTime  = FLUSH_CICRCULATION_INITIAL_WAIT_TIME_MS;
+            stateTimer         = getMSTimerCount();
+            chemDisinfectState = DG_CHEM_DISINFECT_STATE_FLUSH_CIRCULATION;
+            break;
+
+        case NELSON_NONE:
+        default:
+            // Do nothing for these cases.
+            break;
+    }
+}
+#endif