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ROTEX GCU compact -

Set-up and installation

4.4.3 Remove the sound insulation hood

4.5

Air/flue system (LAS)

4.5.1 General instructions for flue system

Minimum requirements

Observe country-specific regulations and EN 15287 for the
design and measurement of the flue gas system.

Basically, for the flue gas system, you can use each flue gas pipe
according to EN 14471 with EU label, which meets the following
minimum requirements:
–

Suitable for gas.

–

Suitable for flue gas temperatures of at least 120°C (temper-
ature class T120 or higher).

–

Suitable for at least 200 Pa overpressure (pressure class P1
or H1).

–

Humidity-resistant (condensation resistance class W).

–

Sufficiently corrosion-resistant (corrosion resistance class 1
or 2).

The properties of the flue gas system must be identifiable on the
installed system (nameplate in the installation room).

Type of connections

–

Directly backwards (fig. 4-1:

SET H,

15 50 79.08

–

At the side towards the back (fig. 4-2:

SET K,

15 50 79.09

–

Direct roof penetration (fig. 4-7, variant 2 and 3:

SET L,

15 50 79.10

For other details and connection dimensions for the three ver-
sions of the flue gas pipe, see section 4.5.3.

–

Each flue gas line must be installed with a suitable test
adapter for checking and setting the combustion values. The
ROTEX LAS construction sets each include a test adapter

(D8PA,

15 50 79.00 93

Installation position and line height

–

The maximum permitted flue gas counter pressure is

200 Pa

The pressure loss in the supply line must not exceed

50 Pa

–

Angle of entry of the flue gas pipe into the chimney or instal-
lation shaft:

at least 3°

–

Slope for horizontal parts of the flue gas pipe:

at least 3°

Counter-slopes are not allowed at any point in the flue gas
pipe.

–

If the flue gas duct needs more than 3 deflections >45° for the
flue gas duct, the maximum height for the flue gas duct
reduces by at least

1 m per deflection

(flue gas calculations

may be needed).

–

If the horizontal connecting piece is extended, the maximum
permitted height of the flue gas pipe is reduced by exactly that
length.

–

Flexible flue gas lines must not be used in horizontal connec-
tion sections.

Flue gas system resistance

For a safe burner start and stable flue gas values in the lower
output range, a minimum resistance in the flue gas line is nec-
essary, especially for liquid gas units.

After the initial burner start, the ROTEX GCU compact switches
at first into the storage tank charging mode. In this mode, the
burner blower runs with max. speed.

Switch the burner on (see chapter 15.2 "Emissions
measurement").

Measure the resistance with a differential pressure
measurement unit on the flue gas measurement location
between the flue gas and intake air measurement openings
(differential pressure for the ROTEX GCU compact at least
0.45 mbar).

If the differential pressure is not reached when the burner
blower is at maximum speed, a silencer will need to be fit-
ted (

E8 MSD, 15 45 78

E11 MSD, 15 45 79

)

The tab. 4-2 shows the maximum permissible height of the flue
gas line to ensure that the ROTEX GCU compact can be op-
erated in the rated power range.

Tab. 4-2 Maximum height for the flue gas duct in m

The characteristics for the flue gas calculation can be obtained
from fig. 4-12 and chapter 15.1 "Data for designing the flue gas
pipe".

WARNING!

There will be a

risk of poisoning

caused by flue gas

escaping within enclosed rooms that are inadequately
ventilated.

Install only approved flue gas systems.

The stipulated ventilation and rear ventilation must
be ensured, depending on the set up variant.

Coverings of the flue gas mouth are not allowed.

Installation

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