Garmin GHP 20 Marine Autopilot System for Steer-by-Wire, Installation Instructions Manual

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Item Description Important Considerations
À
Helm control
Á
12–24 Vdc battery The pump can be connected to a 12–24 Vdc power source.
The NMEA 2000 power cable must be connected to a 9–16 Vdc power source.
Â
Pump
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NMEA 2000 network The helm control and the CCU must be connected to a NMEA 2000 network using the included T-connectors ( page 2 ).
If there is not an existing NMEA 2000 network on your boat, you can build one using the supplied cables and
connectors (
page 12 ).
Ä
CCU The CCU must be installed in the front half of the boat, no higher than 10 ft. (3 m) above the waterline.
Hydraulic Layouts
NOTICE
If the steering system in your boat does not match any of the
hydraulic layouts in this manual and you are unsure how to
install the pump, contact Garmin Product Support.
Before you start the pump installation, identify the type of
hydraulic steering system in your boat. Each boat is different,
and you must consider certain aspects of the existing hydraulic
layout before deciding where to mount the pump.
Important Considerations
• The pump must be reconfigured if the boat is equipped with
an unbalanced steering cylinder ( page 2 ).
• Garmin recommends using T-connectors to connect the
hydraulic lines to the pump.
• To allow for easy pump disabling and removal, Garmin
recommends installing shut-off valves in the hydraulic lines
between the pump manifold and T-connectors.
• Teflon
®
tape must not be used on any hydraulic fitting.
• An appropriate thread sealant should be used on all pipe
threads in the hydraulic system.
Single-Helm without Power Assist Layout
6