33
Instructions for installation and servicing ecoTEC / 839592_09
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.
1
2
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).
• 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
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.
• 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.
Commissioning Part I 5
Appliance
Maximum net
heat input in kW
Gas rate
Natural gas in m
3
/h
Propane in kg/h
nominal
+ 5%
- 10%
nominal
+ 5%
- 10%
ecoTEC plus 612
12.2
1.29
1.36
1.16
0.95
1.00
0.85
ecoTEC plus 615
15.3
1.62
1.70
1.46
1.19
1.25
1.07
ecoTEC plus 618
18.4
1.95
2.04
1.75
1.43
1.50
1.29
ecoTEC plus 624
24.5
2.59
2.72
2.33
1.90
2.00
1.71
ecoTEC plus 630
30.6
3.24
3.40
2.91
2.38
2.50
2.14
ecoTEC plus 637
37.8
4.00
4.20
3.60
2.94
3.08
2.64
ecoTEC plus 824
23.5
2.49
2.61
2.24
1.83
1.92
1.64
ecoTEC plus 831
31.6
3.34
3.51
3.01
2.45
2.58
2.21
ecoTEC plus 837
37.8
4.00
4.20
3.60
2.94
3.08
2.64
ecoTEC pro 24
23.5
2.49
2.61
2.24
1.83
1.92
1.64
ecoTEC pro 28
28.6
3.03
3.18
2.72
2.22
2.33
2.00
Table 5.1 Gas rates
Summary of Contents for ecoTEC pro 24
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