Pag. 30/50
protection switches available on the market have a current tolerance of less than 50%;
therefore, a suitable switch should be chosen.
-
Connect only one single appliance to each switch.
In some cases, after long periods of inactivity or with a new installation, it is possible that the
appliance trips the safety switch when it is turned on. The reason for this is usually moisture in the
insulation. The problem can be solved by a short pre-heating that bypasses the safety thermostat.
Checking gas tightness and pressure (fig. 11 – pag. 5)
Before proceeding to check the pressure, it is necessary to check the tightness of the gas installation
up to the nozzle with a leak-finder spray to ensure that no damage has been done to the appliance
during transportation. Then it is possible to proceed with checking the inlet pressure, which is done
by means of a gauge for liquids , either a "U" gauge or an electronic gauge with a minimum
definition of 0,1 mbar. To carry out the reading, the screw (1) must be removed from the pressure
outlet (2) and the rubber pipe of the gauge connected. Open the gas supply valve of the appliance,
check the pressure output and close the valve. Remove the pipe of the gauge and put back the
screws correctly into the pressure outlet. The pressure valve must be within the minimum and
maximum values shown below:
(*These gases belong to II
2HS3B/P
category, which is used only in Hungary)
If the pressure reading is not within the limits of the table, find out the cause. After solving the
problem, check the pressure again.
Checking the power
Normally, it is sufficient to check that the nozzles installed are the right ones and that the burners
function properly. If desired, further check the power absorbed by using the "Volumetric Method".
With the help of a chronometer and a counter, it is possible to read the volume of gas output to the
appliance in time units. The right comparison volume [E] can be obtained with the formula shown
overleaf in litres per hour (l/h) or in litres per minutes (l/min), by dividing the nominal and
minimum outputs (power) shown in the table of burner features for the lowest heat capacity of the
type of gas foreseen for use with the appliance. This value can be found in the norm tables or can be
provided by the local gas supply company.
The reading must be done when the appliance is already in function.
Type of gas
P
n
[mbar]
P
min
[mbar]
P
MAX
[mbar]
G20 (Methane)
20
17
25
G20 (Methane)*
25
20
30
G25 (Methane)
25
20
30
G25.1 (Methane)*
25
20
30
G30 (Butane)
30
20
35
G31 (Propane)
37
25
45
Power
Heat capacity
E =
