TECHNICAL ASSISTANCE SERVICE
63
CONVERSION FROM ONE GAS TYPE TO ANOTHER
This
TAU UNIT
boiler comes configured for use with G20
(methane) gas. It can also be converted for use with G31
gas (LPG) using the conversion kit provided.
b
Note that all modifications to the gas feed system
are forbidden in Belgium. In Belgium, contact
r
's Technical Assistance Service.
Before starting any conversion work:
- Switch the electricity supply OFF at the system's main
switch and at the control panel.
- Close the gas shut-off cock.
- Loosen the screw (4) and remove the gas valve (1)
from the venturi assembly (2) and gas supply pipe (3).
- Remove the diaphragm (5) from the gas valve and fit
the one supplied.
The table alongside shows the diaphragm diameter
required for the different gas types and boiler models.
- Fit the valve gas back and perform the necessary
calibrations as instructed in the section “Calibrating
combustion parameters” on page 44.
b
The following pressures are required from the gas
supply:
- G20 gas = 20 mbar
- LPG (G31) gas = 37 mbar
b
Conversions must only be performed by quali-
fied personnel from
r
's Technical Assistance
Service, even after the boiler has been installed.
b
On completion of the conversion, adjust the boiler
following the instructions given in the “Calibrating
combustion parameters” section of this manual.
4
Calibrated diaphragm diameter (Ø mm)
1
2
4
4
3
5
TAU 150 UNIT TAU 210 UNIT
G20
10,2
17,5
G31
9,9
12,4
5
