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tighten in given order
torque value = 8 Nm
23.5.1
NON RETURN VALVE
Remove the non-return valve from the fan by loosening the nuts and remove the wiring by disconnecting the connector. Check if there is any
moist or any traces of moist on the fan side of the valve. This can indicate that there is a possible leakage of the non-return valve (danger of
recirculation).
Check always if the rubber seat on which the valve closes isn't damaged or if there is any debris on this seat, if so clean or replace the seat. Also
check if the valve itself isn't jammed and can move freely up and down and if the magnet pulls the valve into its seat, if not so replace the
complete non return valve.
23.5.2
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 failures. Check the fan also for any water damages. In doubt
always replace the fan of the water heater.
23.5.3
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 replaced.
Only use the insulation disk that is supplied by the water heater manufacturer.
The same procedure must be applied on the insulation and gaskets fitted on the burner door.
23.5.4
SIPHON
Disassemble the siphon and clean every part of it. Check the siphon connection of the heat exchanger for any blocking or pollution and clean it
(if necessary). Check the functioning of the siphon by pouring clean tap water in the burner room (when burner door is removed). This water
will exit the heat exchanger by the siphon.
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6
A
4
2
Do NOT operate unit without mounted and filled siphon reservoir.
This is a safety measure: the water in the siphon keeps the flue
gases from leaving the heat exchanger via the condensate drain.
Do NOT wet the rear wall insulation
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