Buderus GB402-320-5, Installation And Maintenance Instructions For Contractors

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10 Inspection and servicing
Logano plus GB402 – 6 720 820 700 (2018/01) 41
▶ Pull out the fan towards the front.
Fig. 61 Dissembling the components of the ventilation air collector
[1] Assembly plate
[2] Carriage
[3] Rear screw
[4] Front screw
[5] Fan
▶ For completing maintenance see

Chapter 10.9, page 41.
10.9 Refitting detached parts
▶ Reassemble all boiler parts that were removed for inspection and
maintenance purposes in the reverse order.
▶ Check all gaskets for wear and damage.
▶ Replace gaskets if required.
10.9.1 Fitting the fan
▶ Push the fan underneath the screws undone on the underside of the
carriage. Lower the fan slightly at the front and insert a new gasket
[1] into the groove in the carriage.
▶ Secure the fan to the carriage using all 4 screws.
Fig. 62 Replacing the fan/carriage gaskets
▶ After the fan installation, check the gasket for correct seating.
10.9.2 Fitting the ventilation air collector and the gas valve
▶ Secure the mounting plate on the fan. Position the rear semi-shell of
the ventilation air collector on the studs of the mounting plate and
push the fan inlet over the studs towards the semi-shell, then secure
it. Insert an inlet adaptor at boiler capacity 320 kW.
▶ Push the impeller onto the studs, so that the marking points
upwards.
▶ Secure the front semi-shell with clips to the ventilation air collector.
▶ Push the compensation hose onto the ventilation air collector.
▶ Secure the gas valve with the nozzle plate on the studs.
10.9.3 Fitting the burner
▶ Insert the gasket on the top of the carriage.
▶ Insert the O-ring into the mixture manifold.
▶ Preassemble 2 screws with sleeve at the heat exchanger site.
▶ Insert the mixture manifold assembly with the burner rod into
combustion chamber and both fitted screws with sleeve.
▶ Secure the mixture manifold on the carriage using 2 other screws
with sleeve.
▶ Push the carriage towards the boiler block.
▶ Secure the mixture manifold on the carriage using 4 screws with
sleeve.
▶ Secure the mixture manifold at the front section of the boiler using 4
nuts.
▶ Plug all necessary cables into the gas valve and fan, and the plug-in
connections into the electrode block. During this step, route
ionisation cable [1] as shown in Fig. 63 (below the guide rod).
Fig. 63 Plug-in connection at the electrode block
Observe the specified replacement interval for gaskets
(

Chapter 10.13, page 42).
When fitting the impeller ensure that the marking points
upwards.
DANGER: Risk to life through escaping flue gas!
▶ During installation, look out for faulty gaskets and
ensure they are seated correctly. Replace faulty
gaskets.
▶ Observe the order of assembly described.
There is an indicator window on the top of the flange so
you can check from the outside that a gasket has been
inserted.