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5.7 Burner mounting (Fig. 11)
The assembly of the burner at the boiler door must ensure perfect tightness for the products of
combustion. Once the burner is installed on the boiler, the space between the burner nozzle and
the refractory material on the door must be filled with the ceramic fiber padding (A) provided.
This prevents the door from overheating, which would result in irreversible warping.
The fuel connections to the burner must be placed so that the boiler door can open completely with
the burner installed.
It is advisable to place a rigid supporting base under the burner to prevent its full weight from neg-
atively affecting the door.
Models
L min. (mm)
100N
230
150N-300N
250
360N-420N
250
500N-950N
320
5.8 Connecting the cooling tube to the flame inspection window
The flame inspection window is equipped with a pressure fitting (1). Once the interior screw is
loosened, it must be connected to outlet 2 on the burner using a silicone hose or copper pipe. This
allows the air blown back by the fan to cool the glass on the window and prevent it from turning
black. Failure to connect the hose or pipe to the window can cause the glass to break.
When disassembling the window for cleaning, check the condition of the seals, replacing them if
necessary. After closing, verify tightness.
5.9 Assembling the panels, mod. PREXTHERM RSH 500N÷950N
a) Carefully position the side panels (pos. 1, 2 - 3 and 4), hooking them onto the supports on the
boiler.
b) Assemble the U (pos. 12).
c) Attach the control panel to the
top front panel (pos. 5).
d) Rest the top panel (pos. 5),
which includes the control panel,
against the side panel (pos. 1),
which includes springs, closing
pins and nuts (pos. 9-10-11).
e) Insert the instrument bulbs in the
sheaths (pos. 13) and make the
electrical connection from the con-
trol panel to the mains, burner, any
pumps, etc. It is advisable to insert
the probes fully into the sheaths to
improve contact. Then secure the
capillary tubes with the springs.
Close the cover on the electrical
panel and pass the burner plug
through the openings on the previ-
ous plate (pos. 14).
Cables and plastic hoses
must pass from the inside of the
casing and exit from the rectan-
gular opening under the door
(pos. 14).
f) Install the top panels (pos. 6-7-8),
hooking them onto the side panels
(pos. 2-3-4), which include springs,
closing pins and nuts (pos. 9-10-
11)
34
EN
L max. (mm)
S
300
-
320
-
360.
-
390
239
cod. A73020821 - 2023-09
PREXTHERM RSH N
fig. 11
fig. 12
fig. 13
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