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Installing the Control Unit
Upgrading the Control Unit
When upgrading, do the following:
1. Remove the control unit housing:
a. Disconnect AC power from each auxiliary power unit at the wall
outlet.
b. Disconnect AC power from each carrier by disconnecting the
power cord at the wall outlet.
c. If the existing control unit is a MERLIN II Communications
System, remove the housing as follows. See Figure 2-7.
i.
Remove the front housing from each carrier by pulling the
bottom-front towards you. When it releases, remove it by
lifting up as shown in Figure 2-7.
ii.
Remove the top from each carrier. in the system by
pushing it straight up from the front.
iii. Discard the MERLIN II Communications System housing.
d. If the existing control unit is a MERLIN LEGEND Communications
System, remove the housing as follows. See Figure 2-7.
i.
From both sides of the control unit, pry the clips from the
housing, using a screwdriver if difficult to reach.
ii. When the clips are freed from the housing, carefully pull
the housing towards you.
NOTE:
If the system has more than one carrier, make sure
you hold the housing only from the basic carrier side.
Otherwise, the housing may disassemble.
iii. Do not discard the housing, unless new housing is
provided. You will reassemble the housing when
installation of the entire system is complete, as described
in Chapter 7.
2-22
Upgrading the Control Unit