diff --git a/tcl/ccr3.addon b/tcl/ccr3.addon
new file mode 100644
index 0000000..6532824
--- /dev/null
+++ b/tcl/ccr3.addon
@@ -0,0 +1,14 @@
+addonDesc = 4 K closed cycle cryostat (TriCS)
+
+makenv tccr -driver [lsdriver] {
+  lsc_sensor tch A -sensor x37342 -sensorname coldh -alarm 330
+  lsc_sensor ts B -sensor x68057 -sensorname screen -alarm 330
+  lsc_loop set -loop 1 -channel A -maxheater 14.4W -resist 36Ohm
+}
+catch {
+  tccr set/prop 100
+  tccr set/integ 100
+}
+tccr set/limit 325
+
+