40 6820 / 6820EVS Manual P/N LS10144-001SK-E:C  09/28/2017
 Follow these steps to flush mount the 6855
1. The back box dimensions are 9-9/32” W x 8-3/8” H. The minimum depth 2". The back box can be mounted prior to the complete 
installation of the 6855 using any of the mounting holes shown in Figure 4.17.
Figure 4.17  Back Box Mounting Holes
2. Remove knockout holes as needed for wires. See Figure 4.18 for backbox knockout locations
Figure 4.18  Back Box Knockout Locations
3. Wire the Annunciator board to the main control panel. See Figure 4.9.
Mounting Holes
Mounting Holes
Wire Knockouts
Wire Knockouts
Wire Knockouts