Water Softener (Where Fitted) - Fisher & Paykel DishDrawer DD603 Service Manual

March 2004 Manual 599082
The fan runs continuously during the drying cycle and will restart if the tub is opened and closed again. After the
wash program is complete, the lid drives up, and the fan continues to run for 30 minutes, but will not restart if the tub
is opened.

3.14 Water Softener (where fitted)

The Water Softener uses a softening material (resin) to prevent most of the elements that cause hard water from
being present in the wash water. The resin can only treat a limited amount of water before it needs to be
regenerated. Regeneration is achieved by pumping salty water (brine) through the resin, and flushing away the hard
elements to the drain. The process of delivering softened water, and regeneration is controlled by the Electronic
Controller.
Delivering Softened Water:- Supply water arrives from the inlet valve. In the water softener it passes through a
piper interrupter (air break) and a diverter valve. It is then either directed through the resin to the dispenser, or
directly to the dispenser, then into the tub. The electronic controller measures the volume of water treated, and adds
an appropriate amount of non-treated water, to deliver a mix which is at the required hardness according to a pre-
determined schedule. Water is treated according to its supply hardness. The customer is able to select one of 5
settings in option adjustment mode.
Regeneration:- Regeneration is triggered when the amount of water that has been treated since the last
regeneration nears the capacity of the Water Softener. The quantities treatable for each of the 5 settings of supply
hardness have been predetermined, and are stored in the electronic controller. When triggered, immediately after
filling for the main wash, the brine pump is activated and delivers a volume of salty water into the resin, at an amount
appropriate to the hardness setting. When the wash cycle finishes, the resin is flushed with supply water, and the
by-products of regeneration are delivered into the wash water, and drained with it away to waste. Normal treatment
of incoming water then resumes.
Salt:- the customer is required to fill the salt tank with dishwashing salt from time to time. Salt is used in the water
softener by mixing it with water to produce the salty water (brine) used in regeneration. When the salt level is low, a
salt level detector causes a glowing red light to appear in the salt bung, and a "Salt" symbol appears in the LCD.
When this happens, the customer should remove the salt bung, and using the salt container provided, pour salt into
the salt reservoir until salt can be seen at the opening. The "Salt" symbol on the LCD will disappear and the red light
will not be visible when the salt tank bung is replaced. In areas where the supply water is moderately hard (21 dH –
degrees of hardness, 375ppm – parts per million, Water Softener Setting 3) the salt reservoir will need to be filled
about once a month, and in harder areas more frequently. Delivery of treated water from one fill of the salt reservoir:
240 litres at 30 – 100 ppm from 375 ppm supply water
144 litres at 30 – 100 ppm from 625 ppm supply water
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