diff --git a/@MyCeCryo/MyCeCryo.m b/@MyCeCryo/MyCeCryo.m
index 5154cb4..b632d50 100644
--- a/@MyCeCryo/MyCeCryo.m
+++ b/@MyCeCryo/MyCeCryo.m
@@ -1,65 +1,166 @@
 % Class for controlling the auto manifold of ColdEdge stinger cryostat.
 % The manifold is managed by an Arduino board that communicates with 
 % computer via serial protocol. 
 
 classdef MyCeCryo < MyScpiInstrument
     
+    properties (GetAccess = public, SetAccess = protected, ...
+            SetObservable = true)
+        
+        % If a long term operation (e.g. starting a cooldown or pumping the 
+        % capillary) is in progress
+        operation_in_progress
+        
+        % Time for the recirculator to pump down helium from the capillary 
+        % before closing it off
+        tr = 20
+    end
+    
+    properties (Access = protected)
+        Timer
+    end
+    
     methods (Access = public)
         function this = MyCeCryo(interface, address, varargin)
             this@MyScpiInstrument(interface, address, varargin{:});
             
+            this.Timer = timer();
+            
             % Buffer size of 64 kB should be way an overkill. The labview
             % program provided by ColdEdge use 256 Bytes.
             this.Device.InputBufferSize=2^16;
             this.Device.OutputBufferSize=2^16;
         end
         
-        function switchAllOff(this)
+        function delete(this)
+            try
+                stop(this.Timer);
+            catch ME
+                warning(ME.message);
+            end
+            
+            try
+                delete(this.Timer);
+            catch ME
+                warning(ME.message);
+            end
+        end
+        
+        % Abort the current operation
+        function abort(this)
+            stop(this.Timer);
+            this.operation_in_progress = false;
+            
+            writePropertyHedged(this, ...
+                'valve1',       false, ...
+                'valve2',       false, ...
+                'valve3',       false, ...
+                'valve4',       false, ...
+                'valve5',       false, ...
+                'valve7',       false, ...
+                'recirc',       false, ...
+                'cryocooler',   false);
+        end
+        
+        function startCooldown(this)
+            assert(~this.operation_in_progress, ['Cannot initiate' ...
+                ' cooldown stop. Another operation is in progress.'])
+            
+            writePropertyHedged(this, ...
+                'valve2',       false, ...
+                'valve3',       false, ...
+                'valve5',       false, ...
+                'valve7',       false);
+            
             writePropertyHedged(this, ...
-                'valve1',   false, ...
-                'valve2',   false, ...
-                'valve3',   false, ...
-                'valve4',   false, ...
-                'valve5',   false, ...
-                'valve7',   false, ...
-                'recirc',   false, ...
+                'valve1',       true, ...
+                'valve4',       true, ...
+                'recirc',       true, ...
+                'cryocooler',   true);
+        end
+        
+        function stopCooldown(this)
+            function switchRecirculatorOff(~, ~)
+                writePropertyHedged(this, ...
+                    'valve1',       false, ...
+                    'valve2',       false, ...
+                    'valve3',       false, ...
+                    'valve4',       false);
+                
+                % Switch off the recirculator after all the valves are
+                % closed
+                writePropertyHedged(this, 'recirc', false);
+                
+                this.operation_in_progress = false;
+            end
+            
+            assert(~this.operation_in_progress, ['Cannot initiate' ...
+                ' cooldown stop. Another operation is in progress.'])
+            
+            % Switch off the cryocooler, close the recirculator supply 
+            % valve (1) and at the same time open the valves bridging the 
+            % recirculator return and supply (2 and 3).
+            writePropertyHedged(this, ...
+                'valve1',       false, ...
+                'valve2',       true, ...
+                'valve3',       true, ...
                 'cryocooler',   false);
+            
+            % Wait for the helium to be pumped out of the capillary by the
+            % recirculator and then switch the recirculator off
+            this.Timer.ExecutionMode = 'singleShot';
+            this.Timer.StartDelay = this.tr;
+            this.Timer.TimerFcn = @switchRecirculatorOff;
+            
+            start(this.Timer);
+            this.operation_in_progress = true;
         end
     end
     
     methods (Access = protected)
         function createCommandList(this)
             
             % Valve states
             for i=1:7
                 if i == 6
                     continue % No valve 6
                 end
                 
                 tag = sprintf('valve%i',i);
                 cmd = sprintf(':VALVE%i',i);
                 addCommand(this, tag, cmd,...
                     'default',  false, ...
                     'fmt_spec', '%b', ...
                     'info',     'Valve open(true)/clsed(false)');
             end
             
             addCommand(this, 'recirc', ':REC',...
                 'default',  false, ...
                 'fmt_spec', '%b', ...
                 'info',     'Recirculator on/off');
             
             addCommand(this, 'cryocooler', ':COOL',...
                 'default',  false, ...
                 'fmt_spec', '%b', ...
                 'info',     'Cryocooler on/off');
             
             addCommand(this, 'press', ':PRES',...
                 'default',  false, ...
                 'fmt_spec', '%e', ...
                 'access',   'r', ...
                 'info',     'Supply pressure (PSI)');
         end
     end
+    
+    methods
+        function val = get.operation_in_progress(this)
+            try
+                val = strcmpi(this.Timer.Running, 'on');
+            catch ME
+                warning(ME.message);
+                val = false;
+            end
+        end
+    end
 end
 
diff --git a/GUIs/GuiCeCryo.mlapp b/GUIs/GuiCeCryo.mlapp
index c5cd6f1..927adaa 100644
Binary files a/GUIs/GuiCeCryo.mlapp and b/GUIs/GuiCeCryo.mlapp differ