Furuno CSH-53, Installation Manual

Page: 10 / 74

6
Shortening the retraction tank
The retraction tank is 900 mm in length when supplied. Shorten the tank as necessary so that
the transducer is placed well below the keel when it is lowered. The following table provides
guidelines for shortening the tank. Refer also to the retraction tank installation drawing at the
back of this manual.
Installation
Method
XDCR Travel
800 mm Remove 0 to
220 mm from
bottom. Same as left Remove 0 to
220 mm from
bottom.
Length D must
be less than
1180 mm. Same as left
1200 mm Remove 0 to
50 mm from
bottom. Same as left Remove 0 to
50 mm from
bottom.
Length D must
be less than
1750 mm. Same as left
D D
Figure 3-3 Guidelines for shortening the retraction tank
Note 1: In the 800 mm type hull unit, when 2220 mm is removed and “D” is minimum. the
effect of air foam is minimized when the transducer is fully protruding in water.
Note 2: In the 1200 mm type hull unit, when 50 mm is removed and “D” is minimum, the effect
of air foam is minimized when the transducer is fully protruding in water.