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lnstalling the Control Unit
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4. See the Control Unit Diagram on Form 1, System Planning.
If you will be adding an expansion carrier, remove the rightmost
module from the control unit and put it aside.
CAUTION:
If you remove the cords from the module, make sure they are
labeled first.
5. If housing clips are already installed on the existing control unit,
remove them:
a.
b.
c.
d.
e.
Remove the rightmost module from the control unit. See
“Removing a Module” later in this chapter for instructions.
Using a flat-blade screwdriver, unscrew the upper-right corner of
the carrier only far enough to free the clip.
Pull the top-right corner of the carrier toward you while grasping
the housing clip and pushing it away from you (to free it from the
carrier).
When the clip is free enough to clear the screw molding on the
back of the carrier, slide the clip out and discard it.
Compare the Control Unit Diagram with the existing control unit.
If you will be installing an additional expansion carrier in this
upgrade, do not replace the clip on the right side until the last
expansion carrier is installed. If no more carriers are to be
installed, replace the clip now, making sure the clip is as far to
the right as possible.
Secure the screw, and then repeat Steps b, c, and d for the
lower-right corner of the carrier.
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Upgrading the Control Unit