Service Handbook OEB/OES/OGB/OGS
4.4.2 Steam generator cleaning and descaling (only in OEB and OGB)
Check:
Descaling of the steam generator is necessary when the pins of the water level probe or
the various steam generator openings (after removing a part) show evidence of heavy
scaling or when the immersion heating element is burnt out due to heavy scaling.
i
Information:
When a lot of scale has collected due to water fluctuation in the settling area 4 in the
steam generator, it can be that the longer pin on the water level probe 5 is covered in
scale and therefore makes contact and completes the electrical circuit. This means that
when the unit is switched on and the steam generator 1 is empty, the immersion heating
element 2/ steam generator burner will immediately switch on although there is not
enough water in the steam generator. This can lead to a malfunction in the unit.
Check filling gap is
free of scale!!
1 = Steam generator 5 = Water level probe
2 = Immersion heating element* 6 = Steam generator pump
3 = Steam outlet opening B4 = Preheating probe
4 = Settling chamber B8 = Safety thermostat
* = In OGB steam generator-heat exchanger
Notice:
When the immersion heating element 2 / steam generator heat exchanger become over
heated, the error code E27 is triggered in the Excess temperature probe B8 plugged into
the convection heating element / pipe next to the burner chamber. The immersion heating
element 2 / steam generator burner will switch off before burning out.
AS/11-2011 4_04e_CONVOTHERM Descaling_b
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