H136/276 and H756???
a. Turn off main power.
b. Remove control box cover
c. Unplug transformer cord from board.
d. Unplug sensors and pressure switch cords to board.
e. Disconnect topside phone type plug.
f. Remove the screws holding to the fingers of the board. Save screws.
g. There is a screw holding the board; remove and save for reuse.
h. Now the only thing holding the board to the control box are the nylon posts.
Press the center clip toward the middle of the nylon posts and the board will
release.
i. At this point I swing the old board out and install the new. Then unplug the wires
off the old and place on the new board.
Reverse to install.
F574/6
a. Turn of main power.
b. Remove control box cover.
c. Unbolt the 2 bolts holding the copper straps to the board. Save for reuse.
d. Unplug phone type cord from board.
e. Label incoming power line to which terminal they are attached to and loosen.
f. Unplug 2 black sensor and 1 pressure switch connectors from the board.
g. There are 2 screws holding the board to the control box. One on the lower
right; the other on the upper left. Remove and store for reuse.
h. There are 3 nylon posts holding the board to the control box. Press the center
clip toward the middle of the nylon posts and the boards will release.
i. Carefully slide the board up and out. It might seem the pressure switch is
making the board unmovable but with care, you can pull it out.
j. At this point I swing the old board out and install the new. Then unplug the wires
off the old and place on the new board.
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