Drain Cycle; Filter Plate; The Filter System; Removing And Cleaning The Drain Filter And Filter Plate - Fisher & Paykel DishDrawer DD605 Service Manual

599447A

3.11 Drain Cycle

The drain pump is a self-priming centrifugal pump that only pumps when the motor is rotating in the drain direction (anti-
clockwise). It has a five bladed impellor pushed into a spline on the lower end of the rotor shaft.
The drain pump housing, which incorporates an inlet and outlet pipe, is welded to the motor housing, hence captivating
the motor.
The inlet pipe plugs straight into the drain sump in the tub and is sealed there by a small 'O' ring.
The outlet pipe has a non-return flap valve to prevent soiled water returning to the tub.
The drain hose is an extruded blow moulded hose that is routed over the link assembly and exits out of the base of the
product and is connected to a domestic drain.
The pump speed during the drain cycle is approx. 4200 rpm. In hardware output diagnostics test mode it is set to the
same speed to aid diagnosing drain problems.
On a double product, the drain motor on the tub which is not being used will run for a short time during the final drain
phase of a wash cycle. This is to remove any drain water that may have back flowed in to the unused tub. This
concurrent drain will not happen if the unused tub is open. If the user presses the power button after water has been
placed in the tub, the product will initiate a "power off" drain and empty the tub.

3.12 Filter Plate

The filter plate is a stainless steel disk positioned below the dish rack and spray arm and completely encompasses the
base of the tub.

3.12.1 The Filter System

The tub has vanes that swirl the water around and over the filter plate. At the front of the tub, located as part of the filter
plate, is the drain filter. Large soils collect in the drain filter and only smaller soil flows through its micro-mesh filter,
eliminating re-depositing of soil during the wash. The drain filter should be regularly checked and cleaned.

3.12.2 Removing and Cleaning the Drain Filter and Filter Plate

The drain filter can be emptied with the dish rack in place by removing the cutlery basket and opening the plastic section
of the dish rack. The filter plate is removable for cleaning by removing the dish rack and spray arm and unlocking the
locknut by turning it anti-clockwise. Turning it too far will also release the rotor and may allow it to be lifted out with the
filter plate.

3.13 Drying Cycle

Immediately after water from the final hot rinse has been drained from the tub, the drying cycle begins.
The drying fan draws air through the vent in the rear into the tub where it absorbs water from the dish load. The
moisture-laden air is then mixed with a larger quantity of ambient air (drawn from the kitchen), to minimise the amount of
vapour visible when air is exiting from the bottom of the drawer front.
A flap valve is located in the fan housing. This is closed to prevent moist air from entering the space behind the door
panel during the wash, reducing the possibility of damage to the controller and LCD. It opens whenever the fan is
running.
The fan runs continuously during the drying cycle for various times depending on the program selected, and will restart if
the tub is opened and closed again. After the wash program is complete (when it beeps and the LCD shows 00), the lid
drives up, and the fan continues to run for anything up to 120 minutes depending on the program, but will not restart if the
tub is opened or if a button is pressed.
Note: Dry enhancement mode, available on DD603 products, is not available on DD605 products.
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