Control and signalling units ø 22 Simplicity, speed, choice! Anti rotation Tab w w 2 w w w 1 Auto-grip ring Fixing head held firmly in the drilling hole during assembly Locking ring to fix the head Locate block onto head and lock in place with rotating metallic latch ÿ ADVANTAGES Our objective is to simplify and shorten time of installation: - Head held firmly in place by auto-grip ring, allows single-hand mounting - Foolproof method of positioning the block sub-assembly correctly on the head - Rotating metallic latch easily accessible with a screwdriver where space is limited - Anti rotation tab to be aligned with notch of panel cut-out (p. 95), retracts when not required Method for tightening the locking ring: Tightening torque: 3 Nm or tightened with fixing tool (p. 82) to hand tight after pressure point plus another half turn. 10