10
Inspection and servicing
Logano plus GB402 – 6 720 820 700 (2018/01)
33
Fig. 39 Removing the front panel
[1]
Front panel
10.2
General work
The following work is not described in any further detail in this
document. It must, nevertheless, still be carried out:
▶ Check the general condition of the heating system.
▶ Visual inspection and function check of the heating system.
▶ Check the ventilation air and flue gas routing for function and safety.
▶ Check all gas and water pipes for signs of corrosion.
▶ Replace any corroded lines.
▶ Check the pre-charge pressure of the diaphragm expansion vessel.
▶ Check the concentration of any antifreeze/additives that may be
used in the system fill/top-up water annually.
▶ If necessary, check installed water treatment cartridges (in the
backfeed section) to ensure they are functioning correctly and for
wear.
10.3
Internal leak test
10.3.1 Determining the test volume
V
test
= V
total
= V
pipe
+ V
gas train
▶ Determine the length of pipe to the main fuel shut-off valve.
▶ Determine the gas train volume (V
gas train
▶ Determine the pipe volume (V
pipe
) using table 15 and table 16).
▶ Calculate the test volume (V
test
) according to the above equation.
Gas valve volume (approximate values)
Gas valve volumes up to 50 kW
0.1
Gas valve volume > 50 kW
0.2
Table 14 Gas train volume (V
gas train
)
Pipe length
Pipework volume (V
pipe
) [l]
Pipework diameter [inch]
[m]
½
¾
1
1¼
1½
2
1
0.2
0.4
0.6
1.0
1.4
2.2
2
0.4
0.7
1.2
2.0
2.7
4.4
3
0.6
1.1
1.7
3.0
4.1
6.6
4
0.8
1.5
2.3
4.0
5.5
8.8
5
1.0
1.8
2.9
5.1
6.9
11.0
6
1.2
2.2
3.5
6.1
8.2
13.2
7
1.4
2.5
4.1
7.1
9.6
15.4
8
1.6
2.9
4.6
8.1
11.0
17.6
9
1.8
3.3
5.2
9.1
12.4
19.8
10
2.0
3.6
5.8
10.1
13.7
22.0
Table 15 Pipework volume (V
pipe
) subject to pipe length and diameter
Pipe length
Pipework volume (V
pipe
) [l]
[m]
Pipework diameter (copper pipe) [mm]
15 x 1
18 x 1
22 x 1
28 x 1.5
35 x 1.5
45 x 1.5
1
0.1
0.2
0.3
0.5
0.8
1.4
2
0.3
0.4
0.6
1.0
1.6
2.8
3
0.4
0.6
0.9
1.5
2.4
4.2
4
0.5
0.8
1.3
2.0
3.2
5.5
5
0.7
1.0
1.6
2.5
4.0
6.9
6
0.8
1.2
1.9
2.9
4.8
8.3
7
0.9
1.4
2.2
3.4
5.6
9.7
8
1.1
1.6
2.5
3.9
6.4
-
9
1.2
1.8
2.8
4.4
7.2
-
10
1.3
2.0
3.1
4.9
8.0
-
Table 16 Pipework volume (V
pipe
) subject to pipe length and diameter
Summary of Contents for GB402-320-5
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