Vaillant eco TEC plus 415, Instructions Manual

Page: 28 / 172

Installation and Servicing ecoTEC plus
28
6 Natural gas to LPG conversion
6 Natural gas to LPG conversion
The ecoTEC plus is able to be field adjusted for use on
LPG – propane G31 gas. To enable conversion the use
of a combustion analyser is necessary.
Caution!
After converting from natural gas to LPG,
commission and check boiler function as
described in commissioning section of the
servicing and installation instructions.
Caution!
This conversion must only be carried
out by a competent person in accordance
with the Gas Safety (Installation and Use)
Regulation 1998. In the UK CORGI registered
installers undertake the work to
a safe and satisfactory standard.
Before starting any work.
Isolate the electrical supply to the boiler.
Turn off the gas supply at the gas service cock fitted
to the appliance.
Turn the gas valve “A” throttle screw (Ref fig.6.1) fully
clockwise.
Turn the “A” throttle screw back anti-clockwise the
required number of turns as stated in Table 9.1 for the
boiler installed.
Ensure the gas analyser is set to the correct fuel
setting propane.
To obtain conversion follow the procedure as listed
below.
Ensure that the gas supply pressure is = 34mbar.
The gas inlet working pressure can be checked at the
pressure test point on the gas valve (fig 5.3.).
Turn gas supply on.
Ensure there is an external heat demand.
Enter the test programs by holding the “+” key, see fig
6.2. and turning power on.
Press “+” until “P.1” is displayed for max rate.
Press “ i ” to operate appliance in this mode.
Allow appliance to stabilise.
Measure the CO
2
at the combustion products test
point, see fig 9.1.
Check CO
2
value (for case off) as stated in table 6.1 for
the boiler installed.
If required, using a screwdriver, adjust the “A” throttle
to obtain correct value. (rotating anti-clockwise to
increase).
Appliance will remain in this mode for 15 minutes or
exit by pressing “ i ” and “+” simultaneously.
Repeat the process above and select “P.2” for min
rate.
Press “ i ” to operate appliance in this mode.
Allow appliance to stabilise.
Check CO
2
value (for case off) as stated in table 9.1 for
the boiler installed.
If required, using a 2mm allen key, adjust the “B”
offset to obtain correct value. (rotating clockwise to
increase)
After checking the combustion, exit by pressing “ i ”
and “+” simultaneously
Refit the chassis panel and the inner case.
(Note the CO
2
will increase slightly).
"A" throttle –
"Pmax" rotate
to increase
"B" offset adjustment
"Pmin" rotate
to increase
Fig. 6.1 Gas control valve
Fig. 6.2 ecoTEC plus controls
Table 6.1
NAT.GAS G20 PROPANE G31
CASE OFF CASE ON CASE OFF CASE ON THROTTLE
CO
2
% CO
2
% CO
2
% CO
2
% ADJUSTMENT
ecoTEC
plus 415 9.1+0.2-0.5 9.3+0.2-0.5 10.1+0.5-0.5 10.3+0.5-0.5
5 TURNS
ecoTEC
plus 418 9.1+0.2-0.5 9.3+0.2-0.5 10.1+0.0-1.0 10.3+0.0-1.0
5 TURNS
ecoTEC
plus 428 9.1+0.2-0.5 9.3+0.2-0.5 10.5+0.3-0.8 10.7+0.3-0.8
5 TURNS
ecoTEC
plus 438 8.8+0.2-0.5 9.0+0.2-0.5 9.8+0.2-0.8 10.0+0.2-0.8
8 TURNS
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