Natural Gas To Lpg Conversion (Ecomax Pro 28E Only) - Vaillant ecoMAX pro SERIES Instructions For Use Installation And Servicing

14 Conversion
14 Natural Gas to LPG conversion
(ecoMAX pro 28E only)
The ecoMAX pro 28E is able to be field adjusted for use
on LPG – propane G31 gas. To enable conversion the use
of a combustion analyser is necessary.
Important!
After converting from Natural Gas to LPG, recommission
and check boiler function as described in commissioning
section of the servicing and installation instructions.
Important!
This conversion must only be carried out by a compe-
tent 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 mains electricity supply to the boiler by dis-
connecting the plug at the socket outlet (if there is only
an isolating switch remove the fuse from the switch).
Turn off the gas supply at the gas service valve fitted to
the boiler.
Remove the front panel, the inner front panel and the
lower front panel to access the gas valve.
Turn the gas valve throttle screw (Fig. 14.4) fully
clockwise.
Turn the throttle back anti-clockwise 5
Ensure that the gas analyser is set to the correct fuel
setting - Propane.
To obtain conversion follow the procedure as below:
- Connect a CO combustion analyser to the test point
2
on the flue adaptor.
- Turn on the gas service cock.
- Turn on the electrical supply, and slide the on/off con-
trol down to the 'I' position to turn on the boiler. Set
the timer to continuous and turn up any room ther-
mostats to call for demand.
- With the boiler interface in normal operating mode,
press and hold the 'mode' button (
until a flashing '0' appears.
Fig. 14.1
22
- Press the '-' key and scroll through until '96' (installer
mode) is shown on the screen, then press the 'mode'-
button again.
Fig. 14.2
- Press the '+' key and scroll through until '8' is shown
on the left of the screen, then press the 'mode' button
again.
1
/ turns.
2
Fig. 14.3
- Set the appliance fan speed/burner to maximum by
pressing the '+' key until '2' (burner to Pmax) is shown
) for 10 seconds on the right hand side of the screen. Press the 'mode'
button again to confirm.
- Check the CO
Allow the boiler time to reach the maximum rate
(approximately 5-10 minutes).
- Adjust the maximum rate CO
using a screwdriver to 10.5 % (rotate anti-clockwise to
increase).
value, which should be 10.5 % ± 0.2 %.
2
with the ('A') throttle
2
Instructions for Use, Installation and Servicing ecoMAX pro