ATDDC4 Series Installation & User’s Guide
5.Slide the circuit board assemblies in partially and secure the required wiring.
6.Slide the circuit board assemblies in fully, then slide the front lenses into place. Note: the inside of the lens has a paper backing which should not be removed. The end with wider paper should go to the right. Replace the end caps and secure each with two Phillips head screws.
ATDDC4 Series Installation & User’s Guide
To set the display format, use the jumper (J1) located on the back of the circuit board which can be accessed by removing the right side end cap and sliding the circuit board out slightly.
Back Side of Circuit Board
Jumper J1 
On = 12 Hour display
Off = 24 Hour display
Mounting the Enclosure
The ATDDC4 Series Wall Clock can be mounted directly to a wall, to a single gang outlet box or, with optional mounting kits, as
Remember that 120VAC power is needed when selecting the clock’s mounting location (24vAC Power optional).
Select a method from among the following options:
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