Hallberg-Rassy HR 310 - The Water System and Water Heater; Water System Maintenance

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The water system and the water heater
The water is drawn from the tank by an electric pump to the taps under pressure. Between the pump
and the taps there is a pulsation damper and sometimes a water heater and a filter. The equaliser is filled
with air and should not be opened or vented. See sketch.
The insulated water heater needs no regular attention. It’s fitted with a safety valve which will let water
come out if it gets overheated. If you notice that the water gets warmer when heated by the engine than
by electricity this is normal. The thermostat is set at a lower temperature to avoid rapid lime stone to
build up. As the shore electricity in some marinas have imperfect earth, which may cause heavy
corrosion on the inside of the heater. The only way to avoid this is to disconnect the shore power or to
have an insulation transformer fitted on the power intake,
In some places the pipe water contains amounts of salt which make it very corrosive when heated.
Mallorca is well-known for this phenomenon.
As the water filter house is transparent you can easily see when the cartridge needs to be replaced.
(HR 40 – HR 64).
To do this: switch off the fresh water pump at the panel and open one of the taps to release the
pressure. After this you can unscrew the lower part by hand. The cartridge can be washed, or better
replaced. If a replacement cartridge, which is normally available at well stocked dealers, should not be
available, it can be left out.
After refitting the filter housing, the air should be let out through a tap or at the vent on the top of the
filter
The HR 64, 62 and 54 have two water tanks, one on port and one on SB with no connection between
them. Both tanks has a separate pump, filter and equaliser, but share the same water heater. You can
choose which tank to use on the switchboard.
The equalizer shall have 1-1.2 bar. It is only possible to check the pressure in a pressure less system.
That means no water in the hoses. Shut off the pressure water pump and open the tap. Check the
pressure. Fill up pressure until you have 1 bar. This must be repeated until the water in the hoses is
gone.