Pag. 10
The appliance must be supplied with one of the
types of gas whose properties and pressure are
set out in the table below:
Connect the appliance to a special gas pipe
with an internal diameter of at least 16 mm for
G1/2” connections and a diameter of at least
20 mm for G3/4” connections. The pipe may
be fixed or flexible but it must be metal. Place a
rapid stopcock between the mains gas supply and each single appliance in a position that enables it to be easily
opened and closed (the internal diameter must not be less than that of the connecting pipe). After connecting
the pipe, make sure that the joints and couplings have no leaks. Use soapy water or a purpose-designed foam
product to detect leaks.
NEVER USE NAKED LIGHTS!
GAS TYPES
PRESSURE in mbar
NOM.
MIN MAX
NATURAL GAS G20
20
17
25
L.P.G. G30/31 28-30/37 20/25 35/45
Check on the rating plate inside on the left-hand side that the appliance has been tested and approved for the
type of gas that the user uses.
Check that the nozzles on the appliance are suitable for the available gas supply.
Use the rating plate data to check that the pressure reducer installed upstream of the appliance provides the
appliance with sufficient pressure (Fig.2).
The appliance has been set in the company to use a 20-mbar G20.
Do not reduce the diameter of the section between the reducer and the appliance. Fit a gas filter above the pres
-
sure adjuster in order to ensure optimum operation.
CHECKING THERMAL POWER
During initial installation and during maintenance or adaptation to another type of gas nominal heat input must be
measured. It can be measured by using the volumetric method with the aid of a litre counter or a chronometer.
After checking connecting pressure and the diameter of the injectors (which must be stamped on the injector),
measure the hourly thermal flow of the gas and compare the results with the value given on Table of the Technical
Specification under the heading ‘Gas consumption’. Deviation of ± 5% from nominal value is permitted.
CHECKING GAS PRESSURE
1- Pressure inlet point.
2- Pressure outlet point.
3- Pilot light adjustment screw. *
4- Control knob.
5- Minimum flow adjustment screw. *
6- Bulb.
7- Maximum flow adjustment screw. *
* This device has been adjusted, immobilised
and sealed by the manufacturer. Do not tam-
per with it under any circumstances.
Fig. 3
1
2
6
7
3
4
5
Before switching on the appliance, measure appliance pressure at the inlet point (ref. 1) to check whether the
mains gas pressure is adequate for appliance operations.
Gas supply pressure must be measured at the pressure point . Use a flexible pipe, connect a gauge e.g. a liquid
gauge that is accurate to 0.1 mbar) to the pressure point (and measure the intake pressure whilst the appliance
is operating. If the pressure reading does not fall within the upper and lower limits indicated on the table, the ap-
pliance cannot be installed.
Switch off the appliance, disconnect the gauge, close the seal screw and contact the gas company to test main
gas supply pressure.
