Removing The Casing - Beretta MYNUTE X C Series Installer And User Manual

3.13

Removing the casing

To access the components inside, remove the casing as indicated below:
- find and unscrew the 2 screws (A - fig. 11) fixing the casing to the boiler levering the two
fixing clips (C - fig. 11), detach the bottom part of the casing
- lift the casing upwards to release it from the top tabs (B - fig. 11), then remove it.
WARNING
b
If removing the side panels, put them back in their initial position, referring to the
adhesive labels on their walls.
b
If the front panel is damaged it must be replaced.
b
The noise absorbing panels inside the front and side walls ensure the airtight seal for the
air supply duct in the installation environment.
b
It is therefore CRUCIAL after the dismantling operations to correctly reposition the
components to ensure the boiler's seal is effective.
3.14 Flue gas exhaust and combustion air suction (Fig. 12)
To evacuate the combustion products, refer to UNI 7129-7131. Always comply with
local standards of the Fire Department, the Gas Company and with possible municipal
dispositions. The evacuation of the combustion products is carried out by a centrifugal fan
and the control board constantly monitors that it is operating correctly. It is essential for
the evacuation of the flue gases and the adduction of the boiler's combustion air that only
original pipes be used (except C6) and that the connection is made correctly as shown in
the instructions provided with the flue gases accessories. A single flue can be connected
to several appliances provided that every appliance is the condensing type. The boiler is
a C-type appliance (with airtight chamber), and must therefore have a safe connection to
the flue gas discharge pipe and to the combustion air suction pipe; these both carry their
contents outside, and are essential for the operation of the appliance.
Both concentric and twin terminals are available.
Suction/discharge pipes length table
25C
Flue gases pipe
Ø 80 mm ("forced open"
110 m
installation)
(type B23P-B53P)
Concentric pipe
10 m
Ø 60-100 mm (horizontal)
Concentric pipe
11 m
Ø 60-100 mm (vertical)
Concentric pipe
25 m
Ø 80-125 mm
Twin pipe Ø 80 mm 60+60 m
b
The straight length includes the first bend (connection into the boiler), terminals
and joints. An exception is made for the vertical Ø 60-100 mm coaxial pipe, whose
straight length excludes bends.
b
The boiler is supplied without the flue gas exhaust/air suction kit, since it is possible
to use the accessories for condensing appliances that best fit the installation
characteristics (see catalogue).
b
The maximum lengths of the pipes refer to the flue accessories available in the
catalogue.
b
It is compulsory to use specific pipes.
b
The non insulated flue gas outlet pipes are potential sources of danger.
b
The use of a longer pipe causes a loss of output of the boiler.
b
Make sure the flue gas discharge pipe is tilted 3° towards the boiler.
b
The exhaust pipes can face in the direction most suited to the installation
requirements.
b
As envisaged by current legislation, the boiler is designed to take in and dispose of
flue gas condensate and/or meteoric water condensate deriving from the flue gas
discharge system using its own siphon.
b
If a condensate relaunch pump is installed, check the technical data (provided by the
manufacturer) regarding output, to ensure it operates correctly.
"Forced open" installation (B23P-B53P) (Fig.13)
In this configuration the boiler is connected to the ø 80 mm flue gases discharge pipe by
means of an adaptor.
- Position the adaptor so that the Ø 60 pipe goes fully into the flue gases turret of the boiler.
- Once positioned, make sure that the 4 notches (A) on the flange connect to the groove
(B) on the Ø 100 of the adaptor.
- Fully tighten the screws (C) that tighten the two locking terminals of the flange so the
adaptor itself is restrained.
Coaxial pipes (ø 60-100 mm) (Fig. 14)
- Position the bend so that the Ø 60 pipe goes fully up against the flue gases turret of the
boiler.
- Once positioned, make sure that the 4 notches (A) on the flange connect to the groove
(B) on the Ø 100 of the bend.
- Fully tighten the screws (C) that tighten the two locking terminals of the flange so the
bend itself is restrained.
Maximum straight length Pressure drop
Bend
30C 35C 40C
65m 65m 53m 1 m
6 m 6 m 6 m 1.3m
7 m 7 m 7 m 1.3m
15 m 15 m 15 m 1 m
33+33 m 35+35 m 28+28 m 1 m
Twin pipes (ø 80 mm) (Fig. 15)
The combustion air suction pipe should be selected from the two inputs, remove the closing
plug fixed with the screws and fix the specific air deflector.
- Position the adaptor on the flue gases pipe so that the Ø 60 pipe goes fully up against
the flue gases turret of the boiler.
- Once positioned, make sure that the 4 notches (A) on the flange connect to the groove
(B) on the Ø 100 of the adaptor.
- Fully tighten the screws (C) that tighten the two locking terminals of the flange so the
adaptor itself is restrained.
If the Ø 60-100 to Ø 80-80 splitter kit is used instead of the twin pipe system, there is a loss
in the maximum lengths as shown in the table (fig. 15a).
- Place the splitter so that the Ø 60 pipe goes fully up against the flue gases turret of the
boiler.
- Once positioned, make sure that the 4 notches (A) on the flange connect to the groove
(B) on the Ø 100 of the splitter.
- Fully tighten the screws (C) that tighten the two locking terminals of the flange so the
adaptor itself is restrained.
Loss of length (m)
Coaxial pipes (ø 80-125 mm) (Fig. 16)
- Place the adaptor vertical attachment so that the Ø 60 pipe goes fully up against the flue
gases turret of the boiler.
- Once positioned, make sure that the 4 notches (A) on the flange connect to the groove
(B) on the Ø 100 of the adaptor.
- Fully tighten the screws (C) that tighten the two locking terminals of the flange so the
adaptor itself is restrained.
- Then fit the Ø 80-125 adaptor kit on the vertical fitting.
Twin pipes with Ø 80 pipework (Ø50 - Ø60 - Ø80) (Fig. 17)
Thanks to the boiler characteristics, a Ø80 flue gas exhaust pipe can be connected to
the Ø50 - Ø60 - Ø80 piping ranges.
b
Bend
For the pipe, you are advised to make a project calculation in order to respect the
45° 90° relevant regulations in force.
The table shows the standard configurations allowed.
Table of standard pipe configuration (*)
1.5 m
Air suction
1.6m
1.6m
Flue gas discharge
1.5 m
1.5 m
(*) Use flue gas system accessories made of plastic (PP) for condensing boilers: Ø50
and Ø80 class H1 and Ø60 class P1.
The boilers are factory set to:
25C: 6,200 r.p.m. in heating mode and 7,600 in domestic hot water mode and the maximum
attainable length is 5m for Ø 50 pipe, 18m for Ø 60 pipe and 98m for Ø 80 pipe.
30C: 5,800 rpm in heating mode and 6,900 in domestic hot water mode, and the maximum
length that can be reached is 2m for Ø50, 11m for Ø60 pipe and 53m for Ø80 pipe.
35C: 6,900 rpm in heating mode and 7,800 in domestic hot water mode, and the maximum
length that can be reached is 2m for Ø50 pipe, 11m for Ø60 pipe and 57m for Ø80 pipe.
40C: 6,900 rpm in heating mode and 9,100 in domestic hot water mode, and the maximum
length that can be reached is 7m for Ø60 pipe and 42m for Ø80 pipe (not applicable for
Ø50 pipe).
Should greater lengths be required, compensate the pressure drop with an increase in the
r.p.m.of the fan, as shown in the adjustments table, to provide the rated heat input.
b
The minimum calibration should not be modified.
Table of adjustments
Fan rotations
Heating
6,200
6,300
6,400
6,500
6,600
25C
6,700
6,800
6,900
7,000
7,100
Ø50 Ø60
0.5 1.2
1 Bend 90° Ø 80
4.5m pipe Ø80
1 Bend 90° Ø 80
4.5m pipe Ø80
Reduction from Ø80 to Ø50 from Ø80 to Ø60
Flue base bend 90°, Ø50 or Ø60 or Ø80
For ducting pipe lengths see table
Pipework ducts
r.p.m.
Maximum length [m]
DHW Ø 50 Ø 60
7,600 5
7,700 7 (*) 23 (*)
7,800 9 (*) 28 (*)
7,900 11 (*) 33 (*)
8,000 13 (*) 38 (*)
8,100 15 (*) 43 (*)
8,200 17 (*) 48 (*)
8,300 19 (*) 53 (*)
8,400 22 (*) 58 (*)
8,500 24 (*) 63 (*)
ENGLISH
Ø80
5.5 for flue gases pipe
7.5 for air pipe
ΔP at boiler
outlet
Ø 80 Pa
18 98 174
125 (*) 213
153 (*) 253
181 (*) 292
208 (*) 332
236 (*) 371
263 (*) 410
291 (*) 450
319 (*) 489
346 (*) 528
7