Index: firmware/App/Modes/ModePreTreat.c
===================================================================
diff -u -rb6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7 -rbbf4e1a170f66ce07af12908a1d0fe101a934e9e
--- firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision b6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7)
+++ firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision bbf4e1a170f66ce07af12908a1d0fe101a934e9e)
@@ -39,6 +39,8 @@
 // ********** private data **********
 
 static BOOL treatStartReqReceived = FALSE;                              ///< Flag indicates user requests treatment begin.
+static BOOL confirmInstallRequested = FALSE;                            ///< Flag indicates user confirms disposable installation.
+
 static BOOL alarmActionStopReceived = FALSE;                            ///< Flag indicates an alarm w/ stop property was triggered.
 static BOOL alarmActionResumeReceived = FALSE;                          ///< Flag indicates alarm action resume received.
 
@@ -156,6 +158,22 @@
 
 /*********************************************************************//**
  * @brief
+ * The signalUserConfirmInstallation function handles user confirmation of
+ * disposable installation.
+ * @details Inputs: none
+ * @details Outputs: treatStartReqReceived, send response to treatment start
+ * @return TRUE if signal accepted, FALSE if not
+ *************************************************************************/
+void signalUserConfirmInstallation( void )
+{
+    if ( ( MODE_PRET == getCurrentOperationMode() ) && ( HD_PRE_TREATMENT_CART_INSTALL_STATE == currentPreTreatmentState ) )
+    {
+        confirmInstallRequested = TRUE;
+    }
+}
+
+/*********************************************************************//**
+ * @brief
  * The signalUserBeginningTreatment function handles user start of a
  * treatment.
  * @details Inputs: none
@@ -251,6 +269,8 @@
 static void resetSignalFlags( void )
 {
     treatStartReqReceived = FALSE;
+    confirmInstallRequested = FALSE;
+
     alarmActionStopReceived = FALSE;
     alarmActionResumeReceived = FALSE;
 }
@@ -324,9 +344,12 @@
 {
     HD_PRE_TREATMENT_MODE_STATE_T state = HD_PRE_TREATMENT_CART_INSTALL_STATE;
 
-    // TODO: handle install verification and transition
-    transitionToDrySelfTests();
-    state = HD_PRE_TREATMENT_SELF_TEST_DRY_STATE;
+    if ( TRUE == confirmInstallRequested )
+    {
+        confirmInstallRequested = FALSE;
+        state = HD_PRE_TREATMENT_SELF_TEST_DRY_STATE;
+        transitionToDrySelfTests();
+    }
 
     return state;
 }
Index: firmware/App/Modes/ModePreTreat.h
===================================================================
diff -u -rb6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7 -rbbf4e1a170f66ce07af12908a1d0fe101a934e9e
--- firmware/App/Modes/ModePreTreat.h	(.../ModePreTreat.h)	(revision b6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7)
+++ firmware/App/Modes/ModePreTreat.h	(.../ModePreTreat.h)	(revision bbf4e1a170f66ce07af12908a1d0fe101a934e9e)
@@ -48,6 +48,8 @@
 void initPreTreatmentMode( void );                                  // Initialize this module
 void transitionToPreTreatmentMode( void );                          // Prepares for transition to pre-treatment mode
 U32  execPreTreatmentMode( void );                                  // Execute the pre-treatment mode state machine (call from OperationModes)
+
+void signalUserConfirmInstallation( void );                         // Signal that user confirms disposable has been installed
 BOOL signalUserBeginningTreatment( void );                          // Signal that user requests treatment begin
 void signalAlarmActionToPreTreatmentMode( ALARM_ACTION_T action );  // Execute alarm action as appropriate for pre-treatment mode
 
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r3d079c1d9ca782edcdf2bd962929a1adcfef9ade -rbbf4e1a170f66ce07af12908a1d0fe101a934e9e
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 3d079c1d9ca782edcdf2bd962929a1adcfef9ade)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision bbf4e1a170f66ce07af12908a1d0fe101a934e9e)
@@ -61,7 +61,8 @@
 
 static U32 serializeMessage( MESSAGE_T msg, COMM_BUFFER_T buffer, BOOL ackReq );
 static BOOL sendTestAckResponseMsg( MSG_ID_T msgID, BOOL ack );
-static BOOL sendAckResponseMsg( MSG_ID_T msgID, COMM_BUFFER_T buffer, BOOL ack );
+static BOOL sendAckResponseMsg( MSG_ID_T msgID, COMM_BUFFER_T buffer, BOOL ack );
+static BOOL sendUIResponseMsg( MSG_ID_T msgID, BOOL accepted, U32 reason );
 
 /*********************************************************************//**
  * @brief
@@ -204,10 +205,44 @@
 
     return result;
 }
+
+/*********************************************************************//**
+ * @brief
+ * The sendUIResponseMsg function constructs an UI response message for a
+ * handled UI message and queues it for transmit on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: response message constructed and queued for transmit.
+ * @param msgID ID of handled message that we are responding to
+ * @param accepted T/F - request accepted?
+ * @param reason reason code if rejected
+ * @return TRUE if response message successfully queued for transmit, FALSE if not
+ *************************************************************************/
+static BOOL sendUIResponseMsg( MSG_ID_T msgID, BOOL accepted, U32 reason )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = msgID;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &reason, sizeof( U32 ) );
+
+    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
+
+    return result;
+}
+
 
 // ***********************************************************************
 // ***************** Message Sending Helper Functions ********************
 // ***********************************************************************
+
 
 /*********************************************************************//**
  * @brief
@@ -506,28 +541,12 @@
  * @details Inputs: none
  * @details Outputs: Sample water command response msg constructed and queued.
  * @param accepted T/F - was sample water request accepted?
- * @param rejReason reason why request was rejected (or zero if accepted)
+ * @param reason reason why request was rejected (or zero if accepted)
  * @return TRUE if msg successfully queued for transmit, FALSE if not
  *************************************************************************/
-BOOL sendSampleWaterCmdResponse( BOOL accepted, U32 rejReason )
+BOOL sendSampleWaterCmdResponse( BOOL accepted, U32 reason )
 {
-    BOOL result;
-    MESSAGE_T msg;
-    U08 *payloadPtr = msg.payload;
-
-    // Create a message record
-    blankMessage( &msg );
-    msg.hdr.msgID = MSG_ID_HD_SAMPLE_WATER_CMD_RESPONSE;
-    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
-
-    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
-    payloadPtr += sizeof( BOOL );
-    memcpy( payloadPtr, &rejReason, sizeof( U32 ) );
-
-    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
-    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
-
-    return result;
+    return sendUIResponseMsg( MSG_ID_HD_SAMPLE_WATER_CMD_RESPONSE, accepted, reason );
 }
 
 
@@ -554,6 +573,20 @@
         sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, FALSE );
     }
 }
+
+/*********************************************************************//**
+ * @brief
+ * The handleInstallationConfirm function handles user confirms disposable
+ * installation msg from the UI.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none.
+ *************************************************************************/
+void handleInstallationConfirm(  MESSAGE_T *message )
+{
+    signalUserConfirmInstallation();
+}
 
 /*********************************************************************//**
  * @brief
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r3d079c1d9ca782edcdf2bd962929a1adcfef9ade -rbbf4e1a170f66ce07af12908a1d0fe101a934e9e
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 3d079c1d9ca782edcdf2bd962929a1adcfef9ade)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision bbf4e1a170f66ce07af12908a1d0fe101a934e9e)
@@ -162,11 +162,14 @@
 void handleSampleWaterCmd( MESSAGE_T *message );
 
 // MSG_ID_HD_SAMPLE_WATER_CMD_RESPONSE
-BOOL sendSampleWaterCmdResponse( BOOL accepted, U32 rejReason );
+BOOL sendSampleWaterCmdResponse( BOOL accepted, U32 reason );
 
 // MSG_ID_UI_SAMPLE_WATER_RESULT
 void handleSampleWaterResult( MESSAGE_T *message );
 
+// MSG_ID_UI_INSTALLATION_CONFIRM
+void handleInstallationConfirm( MESSAGE_T *message );
+
 // *********** public DG command functions **********
 
 // MSG_ID_SET_DG_DIALYSATE_TEMP_TARGETS