Lathem DDC2 - Manual (Page 15)

Page 9 Digital Display Wall Clock Guide
AC Return) Attach the ground wire of the cord (normally green) to the green ground screw located on the
inside back of the case. Slide the lens and circuit board assembly back into the case, replace the end cap
and secure with the four phillips head screws.
DDC4-RS
Remove the two phillips head screws from the left or the right end cap and remove. Slide the front panel
assembly out of the case. Carefully flip the front panel assembly over and lay it face down on a clean,
smooth work surface. Remove one of the vent caps from the case of the wall clock and route the power
cord through it to the back of the display panel. (If the power cord will be routed through the back-of-the-
clock conduit access, route the cord through the gang box and conduit access hole to the back of the circuit
board assembly). Strip away 1/2" of the protective shield from each wire of the power cord. Locate the two
black wires leading from J1 (see figure 2, page 9) and attach the AC In line of the cord to one and the AC
Return line to the other (normally black is AC In and white is AC Return). Attach the ground wire of the
cord, (normally green) to the green ground screw located on the inside back of the case. Slide the front
panel display back into the case, replace the end cap and secure with the two phillips head screws.
Wiring Installation - DDC2/4-RS Series
Secondary Wiring
The DDC Wall Clock comes with a detachable wiring harness to make installation easier. The wiring
harness can be removed from the back of the main circuit board at position J1 as shown in figure 2 so
wiring from the master clock can be attached to the wiring harness with the clock's Electronic Assembly
removed. The leads from the wiring harness should be connected as shown in the diagrams in Appendix A.
RS485 Wiring
The DDC Wall Clock comes with a detachable wiring block to make installation easier. The wiring block
can be removed from the back of the main circuit board at position JP4 as shown in figure 2 so wiring from
the master clock can be attached without the need of holding the Wall Clock itself. Wiring should be
connected as shown in the diagrams in Appendix C.
DDC-TC Wiring
The DDC Wall Clock comes with a detachable wiring block to make installation easier. The wiring block
can be removed from the back of the main circuit board at position JP2 as shown in figure 2 so wiring from
the Timer Control Panel can be attached without the need of holding the Wall Clock itself. Wiring should
be connected as shown in the diagrams in Appendix D.