Bosch Condens 8300i W - Checking the Plate Heat Exchanger; Checking Heating Block

Inspection and maintenance
Condens 8300i W – 6721841531 (2022/10)
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9.14 Checking the plate heat exchanger
▶ Check the strainer in the cold water pipe for contamination
( Chapter 9.13, page 43).
▶ Descale the plate heat exchanger with scale removal agent approved
for stainless steel.
-or-
▶ Remove the plate heat exchanger and replace.
▶ Remove the screw.
▶ Remove the plate heat exchanger.
Fig. 54 Removing the plate heat exchanger
▶ Install the new plate heat exchanger in reverse order.
▶ Make sure that the label "bottom" is facing downwards.
9.15 Checking heating block
▶ Remove cap from test port.
▶ Connect the pressure gauge.
Fig. 55 Test nipple at the mixing device
▶ Check actuating pressure with DHW maximum rated heat output at
mixing device.
The heating block must be cleaned if the following measurements are
obtained:
• GC8300iW 35/40 C < 5.0 mbar
▶ Clean heating block if necessary ( Chapter 9.16).
▶ Remove the pressure gauge.
▶ Attach cap to test port.
▶ Check the gas/air ratio.
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