Immergas HERCULES Condensing 26 2 E Manual page 30

Technical Documentation
Disassembly of combustion circuit main components.
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15
17
18
16
19
21
20
Before disassembling the components, make sure the gas cock
is closed.
Gas nozzle replacement (19).
Loosen the gas pipe (16) in order to access the gas nozzle (19)
positioned at the entry of the Venturi pipe and then replace it
with the gas nozzle that has the suitable diameter for the type
of gas (see gas transformation).
N.B.: on re-assembly of the nozzle (19), pay particular atten-
tion to the correct positioning of the gas gasket.
Important: in the 32 kW model functioning with natural
gas (G20) the gas nozzle (19) is not present and must not be
installed.
Burner disassembly (10).
Loosen the gas pipe (16) and unscrew the two screws (21) that
fix the manifold to the fan, and then loosen the 6 blind nuts
(15) that block the gas manifold flange to the condensation
module (8). To replace the burner gasket in graphite (11)
loosen the 4 screws (24).
N.B.: on re-mounting the burner unit/manifold pay particular
attention to the correct positioning of the cord packing (23),
gas gasket (25), gas pipe gasket (16) and gasket between fan
flange and gas collector (13).
Disassembly of the condensation module (8) and flue
hood (1).
Before carrying out the operation drain off all water present
inside the module.
STHCkW ed 0409
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10
11
12
13
23
9
22
7
8
24
25
7
26
26
Loosen the tightening bolts on the system flow and return pipes
and of the condensate discharge pipe positioned in the lower
part of the module. Loosen the two screws (7) and (9) that fix
the condensation module to the support back using brackets
and sheet steel. Loosen the screws (2) positioned above the flue
hood and push the stub pipe down (4) in a way to release the
flue hood from the flange with sample points.
N.B.: when restoring the connection between the flue hood
and flange with sample points, check the status of the two
flue gaskets (3).
Flue hood disassembly from the condensation module.
Loosen the three nuts (26) that fix the flue hood to the rear
of the condensation module (8) and then separate the hood
from the module.
N.B.: when restoring the connection between condensation
module and flue hood, pay particular attention to the correct
positioning of the lip gasket (6) and the containment gasket
(5).
Disassembly and replacement of ignition and detection
electrodes.
Loosen the two fixing screws on the ignition electrodes unit
(22). Loosen the two fixing screws on the detection electrode
(14).
N.B.: on re-mounting the ignition electrodes, make sure that
the gasket is also re-mounted correctly. For the detection elec-
trode check re-mounting of the O-ring. For both electrodes
scrupulously follow the minimum heights stated in the drawing
in the page at the side.
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Technical Documentation
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HERCULES Condensing Export
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