Vaillant ecoMAX pro SERIES Service Manual download pdf (Page 23)

Instructions for Use, Installation and Servicing ecoMAX pro 23

14 Conversion

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 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 mains electricity supply to the boiler by

disconnecting 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

turns.

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 on

the flue adaptor.

• Turn on the gas service cock.

• Turn on the electrical supply, and slide the on/off control

down to the ‘I’ position to turn on the boiler. Set the timer

to continuous and turn up any room thermostats to call

for demand.

• With the boiler interface in normal operating mode,

press and hold the ‘mode’ button (

) for 10 seconds

until a flashing ‘0’ appears.

• Press the ‘-‘ key and scroll through until ‘96’ (installer

mode) is shown on the screen, then press the

‘mode’button again.

• Press the ‘+‘ key and scroll through until ‘8’ is shown on

the left of the screen, then press the ‘mode’ button again.

• Set the appliance fan speed/burner to maximum by

pressing the ‘+’ key until ‘2’ (burner to Pmax) is shown

on the right hand side of the screen. Press the ‘mode’

button again to confirm.

• Check the CO

value, which should be 10.5 % ± 0.2

%. Allow the boiler time to reach the maximum rate

(approximately 5-10 minutes).

• Adjust the maximum rate CO

with the (‘A’) throttle

using a screwdriver to 10.5 % (rotate anti-clockwise to

increase).

Fig 14.1

12702

Fig 14.3

12704

Fig 14.2

12703

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Vaillant ecoMAX pro SERIES Service Manual Page 23

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