Checking And Setting The Co Content, If Required (Air Ratio Adjustment) - Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

9.11 Checking and setting the CO
quired (air ratio adjustment)
h Note
Checking/adjusting this value is only required
under the following circumstances: Replacing
the gas valve, converting from or to natural
gas/propane during an annual service (if a flue
gas analyser is available) or under suspicion of
faulty combustion!
• Remove the front cover.
• Press the "-" and "+" buttons simultaneously.
The "full load mode" is activated.
• Wait at least 5 minutes until the appliance reaches its
operating temperature.
Fig. 9.11 Measurement of the CO
ure setting
• Measure the CO content at the flue gas analysis
2
point (1) of the flue adapter.
• If required, remove the screw and swing the air inlet
pipe downwards through 90° (do not remove!).
• If necessary, set the corresponding flue gas value
(value with removed appliance front, see Table 9.2) by
turning the screw (2).
-> Turn to the left: Higher CO
-> Turn to the right: Lower CO
Installation and maintenance instructions ecoTEC plus 0020031552_03
content, if re-
2
content; Preparation air fig-
2
content
2
content
2
Note
h
Only for natural gas:
Carry out the setting only in steps of 1/8 turn.
After each setting wait for approx. 1 Minute
until the value has stabilised.
Only for liquid gas:
Carry out the setting only in very small steps
(approx. 1/16 turn.) After each setting wait for
approx. 1 Minute until the value has stabilised.
• Swing the air inlet pipe upwards again.
• Check the CO content again.
2
• If necessary repeat the setting procedure.
• Press the "i" and "+" buttons simultaneously.
The "full load mode" is de-activated. Deactivation of
the full load mode if no button is pushed within a peri-
od of 15 minutes.
• Secure the air inlet pipe.
• Re-fit the front cover.
Settings:
1
CO content after 5 min.
2
Full load mode with
front cladding closed
CO content after 5 min.
2
Full load mode with
front cladding removed
Setting for the
Wobbe-Index W0
2
CO content in full load
mode
Table 9.2 Factory gas settings
Replacing components 9
Natural Propane To-
gas (H) To- lerance
lerance
9.2 1.0 10.2
9.0 1.0 10.0
15 22.5
< 250 < 250
Unit
0.5 Vol.–%
0.5 Vol.–%
kWh/m 3
ppm
57