Dometic SEASTAR POWER ASSIST PA1200-2HP Installation And User Manual page 10

Hydraulic power assist for seastar steering systems
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2-2
Some installers or builders will wire the P/A to turn on with an accessory
switch, or they may wire the accessory switch in series with the engine
ignition signal. In this case you will need to turn the P/A on with a switch.
This feature allows you to turn the power assist off and steer manually in the
event batteries are very low.
In multi-engine setups the P/A can be wired to turn on if any engine is
running, but some installers may elect not to wire it that way. Check with
the installer or builder.
NOTE
When steering loads are high it is possible to turn the helm faster than the
power assist can pump, in which case you will notice an increase in
steering effort. This won't hurt the pump, but it won't make the boat steer
any faster. Simply reduce your steering effort until you just feel an
increased resistance, at which point you'll be steering at the maximum
rate of the P/A pump.
NOTE
Moderate pump noise when steering is normal. The location of the pump
and the material to which it is mounted will affect the volume.
Loss of power assist
If the P/A loses power the steering will revert to a manual hydraulic system.
You will be able to steer the boat normally, but with higher effort. In the
event you lose power assist, slow the boat to reduce steering load and
effort. Refer to the troubleshooting section for assistance.
Autopilot use
The P/A can be used with any hydraulic autopilot system. Simply engage
your autopilot as you normally would. There is no need to turn off the
power assist.
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