Inspection and maintenance
37
Condens 7000 FP – 6721846699 (2022/12)
Fig. 43 Detail overview of the components, side view left side (shown:
without combustion air inlet hose, gas pipe and thermal
insulation 500 kW rating)
[1] Mains power supply plug
[2] PWM signal plug
[3] High limit safety cut-out (on the first centre section, on the left
under the thermal insulation)
[4] Ignition transformer
11.3 General work
The following work is not described in any further detail in this
document. However, they have to be carried out:
Check the general condition of the heating system.
Perform a visual inspection and function check of the heating system.
Check the supply air and flue gas routing for function and safety.
Check all pipes in contact with gas and water for corrosion.
Replace any corroded pipework.
Check the pre-charge pressure of the expansion vessel.
Check the concentration of antifreeze / additives that may be used in
the heating water annually.
If necessary, check installed water treatment cartridges
(in the backfeed section) to ensure they are functioning correctly and
for wear.
During the annual inspection, check the correct function of all
regulating, control and safety equipment and, where applicable, for
correct settings.
11.4 Internal tightness test
11.4.1 Determining the testing volume
Measure the length of the pipeline up to the fuel shut-off valve.
Calculate using value for volume of air/gas ratio control valve
(Table 11).
Table 11 Volume of air/gas ratio control valve (V
air/gas ratio control valve
)
Determine the pipe volume (V
pipe
) using table 12 and table 13.
Calculate the test volume (V
test
) using the equation.
V
test
= V
tot
= V
pipe
+ V
air/gas ratio control valve
Table 12 Pipework volume (V
pipe
) in litres, subject to pipe length and diameter
Table 13 Pipework volume (V
pipe
) in litres, subject to pipe length and diameter
Volume of air/gas ratio control valve V
Air/gas ratio control valve
[l]
Volume of air/gas ratio control valve ≤ 50 kW 0.1
Volume of air/gas ratio control valve > 50 kW 0.2
Pipe length Pipework diameter [inch]
[m] ½ ¾ 1 1 ¼ 1 ½ 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
Pipe length Pipework diameter [mm] (copper pipe)
[m] 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 –
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