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Possible Modification to Heat Exchanger Water Outlet

Valves (to be ABOVE normal external water level):
Centre: Normally OPEN - Close to isolate the two sections.

Left: use to bleed any air in the system
and to 'back flush' the outlet with (mains pressure ?) hose

Right: use to bleed any air in the system
and to 'back flush' the inlet - via heat exchanger external jacket with hose

POSSIBLE problem with ABOVE method:
When cruising, is air likely to build up and need regular bleeding ?
I would think that when cruising, water pressure would remove any air ?

Alternative Method below.
Uses current position and valves are LOW (below external water level).
Vertical pipes to rise ABOVE external water level - to allow valves to be open without flooding.
Before flushing, vertical pipes can easily be 'primed' with water to aid flushing.
In both methods some type of hose connection to be installed at top of the two pipes.

With FIRST method any problems with valves is easily sorted - they are ABOVE external water level.

NOTE: With BOTH methods, when cruising, care must be made to ensure that BOTH side valves are CLOSED and the central valve OPEN. Mel Ashton, July, 2007