4
x
Set-up and installation
– If the horizontal connecting piece is extended to more than
2 m, the maximum permitted height of the flue gas duct is
reduced by exactly that length.
– Flexible flue gas lines may not be used in horizontal connec-
tion sections.
– Straight pipe sections must be fastened at intervals of < 2 m
using suitable wall brackets. Suitable spacers must be used
within vertical shafts.
Flue gas system resistance
A minimum resistance in the flue gas line is necessary, especially
for liquid gas units, to ensure a safe burner start and stable flue
gas values in the lower output range.
After the initial burner start, the ROTEX GCU compact first
switches to storage tank charging mode. In this mode, the burner
blower runs at maximum speed.
●
Switch on the burner (see chap. 15.2).
●
Measure the resistance with a differential pressure gauge on
the flue gas measurement section between the flue gas and
supply air measurement openings (differential pressure for all
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 must be installed
(
DN 80: E8 MSD,
15 45 78
or
DN 110: E11 MSD,
15 45 79
)
Tab. 4-2 shows the maximum permissible height of the flue gas
line to ensure that the ROTEX GCU compact can be operated in
the nominal output range.
Tab. 4-2 Maximum height for the flue gas line in m
You can find the characteristics for the flue gas calculation in
fig. 4-15 and chap. 15.1.
The flue gas mass flow of the system depends on the burner
output of the ROTEX GCU compact.
4.5.2 Connecting a flue gas line
Requirements
– The flue gas system fulfils the requirements described in
chap. 4.5.1.
– The flue gas system fulfils any required other national or
regional safety requirements.
– The ROTEX GCU compact is installed correctly.
Connection
●
Connect the ROTEX GCU compact to the flue gas system
inside the installation room (fig. 4-1 / fig. 4-2).
For dimensions, see tab. 4-1.
●
Place the nameplate of the flue gas duct in the installation
room.
Installation
version
(according to
Max. permissible height of the flue gas
line
4)
GCU compact
315 / 515 320 / 520
524
528
1
1)
, 2, 3, 4
10
2)
, 7
3)
15
2)
, 11
3)
14
2), 3)
10
2)
, 15
3)
5
1)
, 6
1)
25
2), 3)
25
2), 3)
25
2), 3)
25
2), 3)
1)
Shaft cross-section at DN 60: 115 mm x 115 mm,
at DN 80: 135 mm x 135 mm
2)
Concentric flue gas/supply line: DN 60/100
3)
Concentric flue gas/supply line: DN 80/125
4)
Design for natural gas (G20), a horizontal connecting line with a length of 2 m
and a deflection of 87°are taken into account
a
A
Natural gas E/H (G20)
B
Natural gas LL/L (G25)
C
Liquid gas (G31)
m
AG
Flue gas mass flow
P
Burner load
Fig. 4-15 Flue gas mass flow in relation to the burner load ROTEX
GCU compact (all types)
We recommend use of the associated ROTEX LAS
construction sets (see fig. 4-18). They satisfy all
requirements and are also fitted with special acid-proof
seals.
The associated assembly instructions must be observed for in-
stalling the flue gas and supply air holding system components
or their means of attachment.
A
Front view
RV
Inspection section
PA
Test adapter
Fig. 4-16 Top view of GCU compact flue gas connection on the rear with
Summary of Contents for GCU compact 315
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