Strebel S-CB Px 120, Installation Operating & Maintenance Manual

Page: 102 / 118

S-CB Px 120 Manual 102
Burner door gaskets
When these gaskets have changed colours at some parts, the rubber has cured and/or has damages, these gas-
kets must be replaced. Notice: only use the gaskets that are supplied by the boiler manufacturer.
Fan
When the fan blades are polluted and dirty, carefully clean the blades with a soft brush. Notice: do not use too
much force on the blades or else the fan might be out of balance and run irregularly, causing noises and fan fail-
ures. Check the fan also for any water damages. In doubt always replace the fan of the boiler.
Insulation
The insulation of the heat exchanger (located on the rear wall inside the heat exchanger and burner door) must be
inspected. If this insulation disk shows any signs of (water) damage or degradation it should be exchanged. Also
check if there are any indications in the burner room of a high condensate level (caused by a blocked siphon) that
might have wetted the rear wall insulation. When this has happened the rear wall insulation should also be re-
placed.
Only use the insulation disk that is supplied by the boiler manufacturer.
The same procedure must be applied on the insulation and gaskets fitted on the burner door.
Siphon
The siphon must be checked at least once a year. Disassemble the siphon and clean every part of it. Check the
functioning of the siphon by filling it with water. Then blow into the top condensate inlet and gently increase the
pressure. At some point water starts coming out of the siphon outlet. During this the float/ball should gradually
drop into its seat. By doing this, the ball then should close the outlet (almost) completely.
Heat exchanger and burner room
After the removal of the complete burner unit check if there is any debris and dirt in the heat exchanger. The coils
of the heat exchanger can be cleaned by using a non-metallic brush. After this the dirt and dust can be removed
with a vacuum cleaner and by flushing the burner room with water. Don’t forget afterwards to clean the siphon
once again.
Cleaning the burner room with acid or alkali products is prohibited.
D = 8 - 10 mm
D = 0.315 - 0.393 inch D
3.5 mm / 0.14 inch
Point of view in next picture
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