Ferroli SIGMA Installation And Servicing Instructions page 24

02 Adjusting central heating flow temperature
Central heating water temperature is adjusted by rotating the control knob (fi g. 5 ). Rotate the knob clockwise
to increase water temperature, anticlockwise to reduce water temperature. Temperature can be varied from a
minimum of 60°C to a maximum of 8 °C.
However, we recommend not operating the boiler below 50°C.
0 Adjusting room temperature (when a room thermostat is fi tted)
Room temperature is controlled by positioning the room thermostat knob to the re uired value. The thermostat
automatically controls the boiler, temporarily interrupting the electrical supply subject to the room heat
re uirements.
0 Adjusting central heating s stem pressure
The pressure of water in the central heating system is adjusted as described in the paragraph .0 .0 .
To avoid incurring unnecessary expense, in the event of boiler shut down, check that this is not caused by a lack of
electricity or gas, or low water pressure before calling the Customer Technical ervice Helpline.
0 etermining com ustion e cienc and the composition o the flue gases
n the boiler there are two test points, one for ue gas and the other for air.
To carry out the tests, proceed as follows
1) pen the air and ue gas test points
2) ntroduce the probes
) witch the boiler
To ensure correct readings the boiler must have reached normal operating temperature Testing the boiler
e ore thermal e uili rium has been attained will gi e incorrect readings
The following adjustment and conversion operations must be carried out by ualifi ed personnel. FERR L
accepts no liability for damage to property or
unauthorised persons.
To convert the boiler from
versa, the burner injector must be replaced (see fi g. 3).
Gas pressures must then be adjusted on the gas valve as
described in the paragraph .01.
ote A ter con erting the oiler rom natural gas to
li uid gas t the orange plate in the con ersion it
near the data plate
ote injector diameters and pressures at the main
urner are gi en in echnical
Sigma
atural gas to LPG and vice
ata 1 0 )
personal injury resulting from tampering with the boiler by
Injector
Gas valve
Gas cock
Full sequence
automatic control
ig
Limited