Conversion From One Gas Type To Another - Riello TAU 55 UNIT Installation And Maintenance Manual

CONVERSION FROM ONE GAS TYPE TO ANOTHER

This TAU UNIT boiler comes configured for use with G20
(methane) gas. It can 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
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.
Converting the TAU 55-75 UNIT to G31 gas
(using the kit provided with the boiler)
- Loosen the screw (3) and remove the gas valve (1)
from the venturi assembly (2).
- Remove the diaphragm (4) 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 gas valve back and perform the necessary
calibrations as instructed in the section "Calibrating
combustion parameters" on page 45.
b
The following pressures are required from the gas
supply:
- G20 gas = 20 mbar
- LPG (G31) gas = 37 mbar
64
TECHNICAL ASSISTANCE SERVICE
r
's Technical Assistance
b
Conversions must only be performed by quali-
r
fied personnel from
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.
Calibrated diaphragm diameter (Ø)
TAU 55 UNIT TAU 75 UNIT
G20
G31
's Technical Assistance
1
2
3
4
7,7 9
5,1 6,6