Bosch Condens 8300i W - Checking the Non-Return Valve in the Mixing Device; Checking the Electrical Wiring; Checking the Expansion Vessel; Check the Strainer in the Cold Water Pipe and the Turbine

Inspection and maintenance
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Condens 8300i W – 6721841531 (2022/10)
9.10 Checking the non-return valve in the mixing device
1. Disconnect the transformer.
2. Loosen the screw [1] and nut [2] on the mixing device.
3. Remove the mixing device.
Fig. 50 Removing the mixing device
1. Remove the non-return valve.
2. Check the non-return valve for contamination and cracks.
Fig. 51 Non-return valve in the mixing device
▶ Install the non-return valve.
▶ Install the mixing device.
▶ Tighten the screw and nut ([1] and [2], Fig. 50) on the mixing device
with 5.5+0.5 Nm.
9.11 Checking the electrical wiring
▶ Check the electrical wiring for mechanical damage.
▶ Replace defective cables.
9.12 Checking the expansion vessel
The expansion vessel must be checked every year.
▶ Depressurise the appliance.
▶ Adjust the pre-charge pressure of the expansion vessel to the static
head of the heating system, if necessary.
9.13 Check the strainer in the cold water pipe and the
turbine
1. Remove the clip.
2. Loosen the cold water pipe.
3. Pull the strainer out of the cold water pipe and check for
contamination.
Fig. 52 Removing the strainer from the cold water pipe
1. Remove the clip.
2. Pull out the turbine.
Fig. 53 Removing the turbine at the cold water pipe
▶ Select the volumetric flow rate of the turbine with service function 1-
b2.
▶ Blow in the flow direction of the turbine.
▶ If nothing appears on the display, replace the turbine.
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