diff --git a/tcl/drivers/ccu4.tcl b/tcl/drivers/ccu4.tcl
index 8c99f2e..576a6c0 100644
--- a/tcl/drivers/ccu4.tcl
+++ b/tcl/drivers/ccu4.tcl
@@ -123,7 +123,7 @@ proc stdConfig::ccu4 {{title CCU4} args} {
 
     node hav out
     prop newline 1
-    prop enum 1
+    prop enum none,int,ext
     prop label "He lev. available"
   
     node h upd -secop=helev
diff --git a/tcl/drivers/ccu4ext.tcl b/tcl/drivers/ccu4ext.tcl
index 4c56ec6..4292795 100644
--- a/tcl/drivers/ccu4ext.tcl
+++ b/tcl/drivers/ccu4ext.tcl
@@ -143,6 +143,9 @@ proc ccu4ext::fillExt {type} {
   } else {
     set valve [sctval /cc/hv]
     set auto [sctval /cc/ha]
+    if {[sctval /cc/hav] != 2} {  # must be on 2=ext
+      hset /cc/hav 2
+    }
   }
   set errtxt ""
   set sm [expr [DoubleTime] > [silent 0 sct change_time] + 10]
diff --git a/tcl/ma10.config b/tcl/ma10.config
index bc041b8..0b3f939 100644
--- a/tcl/ma10.config
+++ b/tcl/ma10.config
@@ -15,6 +15,9 @@ makenv tt -driver [lsdriver] {
 tt set/limit 310
 
 makeCCU4 ma10 nv_release_blocked he_ilm
+hefill minfillminutes 20
+hefill maxfillminutes 60
+
 hupdate /nv/set 1.8
 
 makenv mf -driver ipsmag -port ma10-ts:3001 -controller _mf