Gas Inlet Working Pressure; Checking The Gas Rate - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

5.9.2 Gas inlet working pressure

Check the inlet pressure as described below:
• Remove the front case from the boiler.
• Close the gas shutoff valve fitted to the boiler.
Fig. 5.13 Checking the gas supply pressure
• Loosen the sealing screw marked "in" (1) on the gas
valve assembly.
• Connect a digital or a U gauge (2).
• Open the gas shutoff valve fitted to the boiler.
• Put the boiler into operation (refer to the Instructions
for Use supplied with the boiler).
Maximum net
Appliance
heat input in kW
ecoTEC plus 612
ecoTEC plus 615
ecoTEC plus 618
ecoTEC plus 624
ecoTEC plus 630
ecoTEC plus 637
ecoTEC plus 824
ecoTEC plus 831
ecoTEC plus 837
ecoTEC pro 24
ecoTEC pro 28
Table 5.1 Gas rates
Instructions for installation and servicing ecoTEC / 839592_09
Natural gas in m
nominal
12.2 1.29
15.3 1.62
18.4 1.95
24.5 2.59
30.6 3.24
37.8 4.00
23.5 2.49
31.6 3.34
37.8 4.00
23.5 2.49
28.6 3.03
• Check the U gauge reading and ensure the inlet gas
pressure is between the pressures detailed below.
Caution! Natural gas:
DO NOT proceed with adjustment or attempt to
put the unit into service if the inlet working
1
pressure lies outside the 17–25 mbar range.
Caution! LPG:
DO NOT proceed with adjustment or attempt to
put the unit into service if the inlet working
pressure is lower than 37 mbar.
• Turn off the appliance, remove U gauge.
• Tighten the test point screw and check for leaks.
• Record appliance working gas inlet pressure (mbar) in
the Benchmark gas boiler commissioning checklist.

5.9.3 Checking the gas rate

The boiler is fitted with a fully modulating automatic gas
valve which ensures that the precise air/gas ratio is pro-
vided under all operating conditions.
The gas rate has been set during production and does
not require adjustment.
The gas rate of the boiler should be checked with the
front case fitted as follows:
• Activate full gas rate mode by simultaneously press-
ing the "+" and "–" buttons on the display system (for
ecoTEC combination boilers fully open the hot water
tap to maximum water flow rate).
• Wait at least 5 minutes, or until the boiler has reached
its operating temperature.
2
• With all other gas appliances turned off measure the
gas rate at the gas meter. Check that the gas rate is
as stated in Table 5.1.
Caution!
If the measured gas flow volume lies outside
the tolerance limits specified in Table 5.1, do
not operate the appliance and inform the
Vaillant Customer Service.
Gas rate
3
/h
+ 5% - 10%
1.36 1.16
1.70 1.46
2.04 1.75
2.72 2.33
3.40 2.91
4.20 3.60
2.61 2.24
3.51 3.01
4.20 3.60
2.61 2.24
3.18 2.72
Commissioning Part I 5
Propane in kg/h
nominal + 5%
0.95 1.00
1.19 1.25
1.43 1.50
1.90 2.00
2.38 2.50
2.94 3.08
1.83 1.92
2.45 2.58
2.94 3.08
1.83 1.92
2.22 2.33
- 10%
0.85
1.07
1.29
1.71
2.14
2.64
1.64
2.21
2.64
1.64
2.00
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