Step 1: Turn off the power feeding your existing controller at the breaker box.
Step 2: Unscrew four plastic corner screws off the front of the controller
Step 3: Unplug and label the output ribbon cable, 24v wire, and common wire
Step 4: Now that the old top lid is uninstalled, we can install the new lid assembly
Step 5: At this point install the CH add on board attached to your new lid assembly into the relay
board in the bottom of the enclosure. See Figure 1 below.
Figure 1: CH add on board pins connected into headers on bottom relay board.
Step 6: Plug ribbon cable in housed header marked in yellow on the lid. See Figure 2 below.
Figure 2: Ribbon cable plugged into top board.