Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 38

Condition: Gas flow pressure in the permissible range
▶
End check programme P.01.
▶
Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶
Close the gas stopcock.
▶
Remove the pressure gauge and retighten the sealing
screw (A) or (C) for the measuring nipple.
▶
Open the gas stopcock.
▶
Check the test nipple for gas tightness.
▶
Install the front casing. (→ Page 18)
▶
Reset boiler controls for normal operation.
Validity: Great Britain OR Ireland
▶
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commission-
ing checklist.
9.13.5 Checking the CO₂ content and, if necessary,
adjusting it (air ratio setting)
1. Ensure that the heating circuit valves are open.
2. Start up the product with the check programme P.01.
3. Wait at least five minutes until the product reaches its
operating temperature.
1
4. Use a combustion analyser to measure the CO₂ con-
tent at the flue gas analysis point (1).
5. Compare the measured value with the corresponding
value in the table.
Set values, natural gas H
CO₂ after Checking
5 minutes during
in full load start-up
mode with
Checking
front casing
after reset-
closed
ting
CO₂ after Checking
5 minutes during
in full load start-up
mode with
Checking
front casing
after reset-
removed
ting
Set for Wobbe index W₀
O₂ after 5 Checking
minutes during
in full load start-up
mode with
Checking
front casing
after reset-
closed
ting
38
VU 446/5-5 VU 606/5-5
(H-GB) (H-GB)
9.2 ± 1.0 vol. 9.2 ± 1.0 vol.
% %
9.2 ± 0.3 vol. 9.2 ± 0.3 vol.
% %
9.0 ± 1.0 vol. 9.0 ± 1.0 vol.
% %
9.0 ± 0.3 vol. 9.0 ± 0.3 vol.
% %
14.1 kW⋅h/m³ 14.1 kW⋅h/m³
4.5 ± 1.8 vol. 4.5 ± 1.8 vol.
% %
4.5 ± 0.5 vol. 4.5 ± 0.5 vol.
% %
CO content
CO/CO₂ content
Set values, liquefied petroleum gas P
CO₂ after Checking
5 minutes during
in full load start-up
mode with
Checking
front casing
after reset-
closed
ting
CO₂ after Checking
5 minutes during
in full load start-up
mode with
Checking
front casing
after reset-
removed
ting
Set for Wobbe index W₀
O₂ after 5 Checking
minutes during
in full load start-up
mode with
Checking
front casing
after reset-
closed
ting
CO content
CO/CO₂ content
6. Remove the front casing. (→ Page 18)
Validity: VU 446/5-5 (H-GB)
Condition: The CO₂ content must be adjusted
1
▶
Set the CO₂ content (value with front casing removed)
by turning the screw (1).
▶
Only carry out the adjustment in increments of 1/8 turn
and wait approximately 1 minute after each adjust-
ment until the value stabilises.
Note
Turn anti-clockwise: Lower CO₂ content
Turn to clockwise: Higher CO₂ content
Installation and maintenance instructions ecoTEC plus 0020261389_03
VU 446/5-5 VU 606/5-5
(H-GB) (H-GB)
≤ 250 ppm ≤ 250 ppm
≤ 0.0031 ≤ 0.0031
VU 446/5-5 VU 606/5-5
(H-GB) (H-GB)
9.9 ± 1.0 vol.
10.1 ± 1.0 vol.
%
%
9.9 ± 0.3 vol.
10.1 ± 0.3 vol.
%
%
9.7 ± 1.0 vol. 9.9 ± 1.0 vol.
% %
9.7 ± 0.3 vol. 9.9 ± 0.3 vol.
% %
21.3 kW⋅h/m³ 21.3 kW⋅h/m³
5.9 ± 1.8 vol. 5.5 ± 1.8 vol.
% %
5.9 ± 0.5 vol. 5.5 ± 0.5 vol.
% %
≤ 250 ppm ≤ 250 ppm
≤ 0.0029 ≤ 0.0028