the following is from the frigoboat install manual, unfortunately, very poorly copied. perhaps some of you electrically minded
guys can make heads or tails of it. any wonder i prefer air cooled?
4:2 Grounding and cleaning
Provision is provided for a grounding/bonding wire to be attached. It is very important that the
Cooler is electrically connected to a point that is at the same potential as the boat’s battery
negative, with no switch in the circuit between the Keel Cooler connection and the battery
negative. This connecting wire should be green in color and of 8 AWG or higher.
If the Keel Cooler being installed is the type without zincs, it must be connected to the vessel’s
bonding system and also to a sacrificial zinc anode. This is an important safety
does not alter the fact that a connection must be made between the Keel Cooler and a point that is at
the same potential as the boat’s battery negative, whether the Keel Cooler has zincs or not. Bonding
wire should be green in color and of 8 AWG or higher.
If the installer is in any doubt as to how to make the grounding/bonding connections, a marine
electrical technician should be consulted.
The connections must be checked with a multi-meter after installation
to ensure that Keel Cooler and
the battery negative post are at the same potential.
The sintered “Ground Plate” Keel Cooler should not be painted unless heavy and consistent fouling
proves to be an issue. Clean occasionally with a brush, never with a metal scraper. All models of
Keel Cooler must be inspected periodically for corrosion.
NOTE: Never operate a Keel Cooled system while the boat is out of the water
without having first
rigged some form of temporary water cooling
on the Keel Cooler. If a Capri
air cooled condensing
unit or an Air Add-On air cooled condenser is installed together with a Keel Cooler, ensure that
the fan is operated when the boat is out of the water but switched off when the boat is launched.