34
OFF SET ADJUSTMENT
REGOLATION GAS - AIR
Fig. 33
Fig. 34
8.3 CHANGES FOR DIFFERENT GAS TYPE USED
In case of methane gas isn’t supplied but a different
type of gas is used, it is required to adjust some devices
on the gas line.
This operation shall be carried out by expert operator,
trained on the gas-fired heater function and safety and
only certified parts shall be used.
Once replaced the concerned items the gas valve
adjustment shall be carried out, based on the CO
2
values shown in table n.16.
8.4 MAINTENANCE
Maintenance shall be carried out in accordance to the
local regulation about gas-fired heating system.
However it is recommended to perform the unit
maintenance and general cleaning of the unit (exhaust
test, heat-exchanger and air blower grid).
Every year at least, before the cold season and the
Heater use.
Any maintenance work shall be carried out by qualified
operator, trained on the gas-fired heater function and
safety.
Generally, if the limit thermostat activates often,
the above mentioned test and cleaning shall be
performed.
However, before re-starting the heater always ensure
the failure cause is removed.
VALUES OF CO2 FOR GAS VALVE
ADJUSTMENT
METHANE
9,8% - 10,2 %
LPG 10,8 % - 11,2%
Table n. 16
Gas pressure intermediate
P
int
Gas pressure
P
out
Air signal Pa
Air signal Pa
