Servicing and spares
Bosch Condens 5000W – 6 720 646 195 (2018/10)
40
6.7 Checking the heat exchanger
NOTICE:
Combustion testing
▶ Setting of the gas ratio must be carried out by an authorised person.
Setting of the gas ratio must not be attempted unless the person
carrying out the test is equipped with a calibrated combustion
analyser and is competent in it‘s use.
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.
There is an accessory kit available designed for cleaning the heat
exchanger, part number: 7 716 192 312.
▶ Isolate the power to the boiler and remove outer case and base panel.
1. Refer to figure 73 and remove the clip from gas valve outlet.
If the plastic elbow can not be easily removed, undo the nut to push the
plastic elbow out of the fitting.
2. Pull the gas outlet elbow free from the gas valve.
Fig. 73 Upper gas valve connection removal
▶ Remove electrical connector and earth wire from fan.
To prevent damage to the electrodes when removing the air/gas
manifold, disconnect the leads to the electrodes.
▶ Disconnect spark electrode and flame sensor connections.
1. Refer to figure 74 and undo the securing nut on the top of the heat
exchanger and remove the retaining plate assembly.
Fig. 74 Air/gas manifold securing nut
1. Refer to figure 75 and rotate fan and air/gas manifold assembly
around the top of the heat exchanger until it stops at the lug.
▶ Lift up assembly and remove from boiler.
2. Remove the cover panel by removing retaining screw.
Fig. 75 Rotate air/gas manifold
1.
2.
6720643895-72.1Wo
1.
6720643895-60.1Wo
6720643895-63.1Wo
1.
2.
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