Furuno FSV-30 Shortening the retraction tank, Guidelines for shortening the retraction tank

1.1.2 Shortening the retraction tank

The retraction tank is 1300 mm in length when supplied. Shorten the tank as necessary so that the transducer positions well below the keel when it is fully 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				D		D
XDCR Travel
	Remove 280		Remove 280 - 290 mm
	- 290 mm		from the bottom.
1200 mm	from the	Same as left.	Note that the length		Same as left.
	bottom.
stroke			"D" must be less than
			1170 mm.
	Remove		Remove less than
			290 mm from the
	less than				Same as left.
			bottom. Note that the
1600 mm	290 mm	Same as left.
			length "D" must be less
	from the
stroke			than 1570 mm.
	bottom.

Guidelines for shortening the retraction tank

Note 1: For the 1200 mm stroke hull unit, the transducer will not fully protrude unless the tank is shortened by at least 280 mm from the bottom, and cannot be fully retracted if more than 290 mm is removed.

Note 2: For the 1600 mm stroke hull unit, the transducer cannot be fully retracted if the tank is removed more than 290 mm.

Note 3: When 290 mm is removed and “D” is minimum, the effect of air foam is minimized because the transducer fully protrudes in water.

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