Rinsing And Pumping System - Bosch SRU53E05AU Repair Instructions

4.13

Rinsing and pumping system

A NTC / temperature controller
B Safety temperature controller
Instantaneous water heater
C
D Circulation pump
E Seal set
F Pump wheel
G Pump sump
* Optional
815_58300000120057_ara_en_d.doc – 25.05.11
H Detergent-solution pump
I Pump wheel cover
Non-return valve
J
K To the lower spray arm
L To the upper spray arm
M Aqua sensor *
The circulation (D) and drainage pumps (H) as well as the
instantaneous water heater (C) are connected to the pump sump (G)
via plug-and-socket connections. The instantaneous water heater (C)
is also screwed securely to the pump sump (G). The filter system
consists of fourfold filtration. The pump sump (G), which houses the
microfine filter, is covered by the surface fine filter. The surface filter
is attached together with the combined coarse and fine filter cylinders
to the base of the pump sump via a bayonet catch. The detergent
solution is drawn into the pump sump by the circulation pump (D)
and forced into the instantaneous water heater (C).
At the appropriate pressure the pressure switch for the heater is
actuated via the flange-mounted membrane. A temperature controller
(B) connected in series disconnects the appliance at 85 °C to prevent
overheating.
In mechanically controlled appliances, this temperature switch (A)
isٔ c ombined with a 65 °C temperature controller and housed in one
module, in electronically controlled appliances it is combined with
an NTC sensor (negative temperature coefficient) and housed
in one module.
The sensor surface is in direct contact with the detergent solution.
The Aqua sensor (M) is situated at the outlet of the instantaneous
water heater (C) in the detergent solution flow and measures the
degree of turbidity. As the drainage pump (H) is attached directly
to the pump sump (G), the impeller wheel and non-return valve are
accessible in the rinsing tank when the cover has been removed.
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