Vaillant ecoTEC plus 937 Service Manual download pdf (Page 51)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 51

8.1.4 Adjusting the CO

concentration (or the air

ratio)

Danger!

Increased risk of poisoning due to incorrect

settings!

Incorrect setting may increase the risk of poi-

soning.

If one of the flue gas values is greater than

the acceptable values in Table 8.1 then

check

- the integrity of the complete flue gas

installation

- the integrity of the combustion circuit

seals

- the gas inlet working pressure

- the gas flow rate.

If the flue gas value needs to be adjusted,

unfasten the screw (Fig. 8.1, 2) and

fold the air intake pipe (Fig. 8.1, 3) forwards through

90°. Do not remove the air intake pipe.

Specify the required flue gas value if necessary

(value with front casing of boiler removed, see

Table 8.1) by turning the screw of the main throttle

(Fig. 8.1, 1)

Use a 4 mm hexagon socket spanner to turn

the screw.

Turn to the left: higher CO

concentration,

Turn to the right: lower CO

concentration.

Natural gas: Only perform the adjustment in

increments of 1/8 turn and wait approxi-

mately 1 minute after each adjustment until

the value stabilises.

Liquid gas: Only perform the adjustment in

very small increments (approximately 1/16

turns), and wait approximately 1 minute after

each adjustment until the value stabilises.

After performing the adjustments, fold the air intake

pipe back up.

Check the CO

concentration once again.

If necessary, repeat the setting process.

Push the „i“ button to deactivate the full load mode.

The full load mode is also deactivated if no button is

pushed for 15 minutes.

The adjusting screw shall be sealed after the adjust-

ment.

Re-secure the air intake pipe with the screw (2).

Put the front casing back on.

Settings Natural gas (H)

Tolerance

Propane

Tolerance

Unit

after 5 minutes full

load mode with

boiler front casing closed

9.2 1,0 10.2 0,5 Vol.–%

after 5 minutes full

load mode with boiler

front casing removed

9.0 1,0 10.0 0,5 Vol.–%

Set for Wobbe-Index W

15 22.5 kWh/m

CO value with full load < 250 < 250 ppm

CO/CO

< 0,0031 < 0,0026

Table 8.1 Factory gas settings

Danger!

Risk to life due to poisoning!

CO is an extremely toxic gas. Risk to life due

to excessive CO concentrations.

f you are not able to adjust the boiler cor-

rectly and the flue gas values remain

higher than allowed in Table 8.1, call the

Vaillant Service Solutions.

Do not start up the boiler!

Inspection and maintenance 8

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Vaillant ecoTEC plus 937 Service Manual Page 51

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