Servicing and spares
Bosch Condens 5000W – 6 720 646 195 (2018/10)
42
Cleaning the primary heat exchanger
▶ Access the heat exchanger flue ways by inserting the cleaning brush
(7 716 192 312) through the top access hole in the casing, removal
of panel shown in figure.
▶ Clean heat exchanger flue ways using the cleaning brush removing
any debris from the access point in the sump.
▶ Clean around the sealing surface on the sump.
▶ Replace the access cover.
▶ Using a suitable container to collect water from syphon connection at
the base of the boiler flush heat exchanger with water.
▶ Re-assemble ensuring that the lower baffle [2] and the top baffle [1]
are refitted correctly (refer to figure 77).
▶ Refer to figure when re-fitting the burner to ensure that it fits centrally
within the heat exchanger and location tabs are situated in location
holes.
▶ Ensure that the seal is replaced with a new seal and ensure that the
seal is correctly fitted.
▶ Check the syphon unit is clean before refitting to boiler.
▶ Reassemble and check combustion as stated in Setting the air/gas
ratio section on page 39.
The heat exchanger does not have to be removed for cleaning.
The heat exchanger is shown removed from the boiler to illustrate
cleaning more clearly.
Fig. 79 Cleaning the heat exchanger
CAUTION:
Heat exchanger baffles
▶ The baffles [1] and [2] must be refitted into the heat exchanger in the
order shown in figure 77. Failure to do so may result in damage to the
boiler.
NOTICE:
CO/CO
2
checks
▶ If the joint between the air/gas manifold and heat exchanger is
disturbed the sealing gasket must be replaced.
▶ After completing the service of the boiler, the CO/CO2 must be
checked and set to the limits shown in section Setting the air/gas
ratio on page 39.
▶ When replacing the burner gasket ensure that the clamping plate is
fully tightened down to the heat exchanger.
Cleaning the syphon
There is no need to remove the syphon to clean.
To drain debris from the syphon, release the clips and remove the
drainage cap from the bottom of the syphon.
Catch the debris and condensate from the syphon into a suitable
container.
6.8 Replacement of parts
CAUTION:
Gas and mains supplies
▶ Turn off the gas supply and isolate the mains supplies before starting
any work and observe all relevant safety precautions.
CAUTION:
Replacing components
▶ After replacement of any components always check for gas tightness
where relevant and carry out functional checks as described in
commissioning.
Damaged O-rings or gaskets must be replaced.
6720643895-65.1Wo
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