Immergas HERCULES Condensing 26 2 E Manual page 29

Technical Documentation
HERCULES Condensing 26 2 E = 4.7 kW (4.042 kcal/h) (20
% of the nominal output).
HERCULES Condensing 32 2 I = 6.9 kW (5.934 kcal/h) (20
% of the nominal output).
Ignition takes place by means of an integrated P.C.B. that
controls the ignition (7) and detection electrodes (9).
Ignition electrodes (7).
They are controlled by an igniter (activated by the integrated
P.C.B.) that causes an electrical spark between the two elec-
trodes on which, on contact, the air-gas mixture ignites.
The electrode (8) has no ceramic insulation and is connected
directly to earth (blind electrode).
They are positioned on the right side of the burner and fixed
onto the flange (4) of the same.
Note: If the igniter must be replaced, for correct connection
of the ignition electrodes, follow the lay-out given below
(otherwise no discharge is obtained).
Detection electrode (9).
It is controlled by the integrated P.C.B. and detected burner
ignition.
It also acts as a flue safety device when any air intake problems
or problems with the evacuation of combustion products make
the burner function below minimum output.
In this case the flame block due to no detection by the elec-
trode.
In order to protect the combustion circuit, the same type of
block prevents the module from filling with water when there
is difficulty draining condensate (trap blocked, etc).
It is fixed onto the left side of the burner flange (4).
IGNITER DRAWING
STHCkW ed 04/09
Technical Documentation
9
1
2
3
Note: In the case of ignition block, check the distances of the
ignition and detection electrodes keeping to the heights stated
in the figure below.
27
AIR
4
5
P2
P1
GAS
HERCULES Condensing Export
8
7
6