Figure 158  Detector Head Removal 
2.  Remove and invert the top part of the Detector head. Examine the base moulding seal and replace if 
damaged or perished, see Figure 159. 
 
Screw Removal  
     
Figure 159  Base Moulding Seal  
Caution:  Do not press the fan, only handle the outer housing. 
3.  Using the Pulling Tool, Figure 160, remove the Fan Retaining Plug by capturing the shoulder and 
pulling. Carefully remove the Fan from its mountings, Figure 161.