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4.02 Adjusting central heating flow temperature
Central heating water temperature is adjusted by rotating the control knob (fig. 52). 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 82°C.
However, we recommend not operating the boiler below 50°C.
4.03 Adjusting room temperature (when a room thermostat is fitted)
Room temperature is controlled by positioning the room thermostat knob to the required value. The thermostat
automatically controls the boiler, temporarily interrupting the electrical supply subject to the room heat requirements.
4.04 Adjusting central heating system pressure
The pressure of water in the central heating system is adjusted as described in the paragraph 2.02.07.
N.B. - 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 Service Helpline.
4.05 Determining combustion efficiency and the composition of the flue gases
On the boiler there are two test points, one for flue gas and the other for air.
To carry out the tests, proceed as follows:
1) Open the air and flue gas test points;
2) Introduce the probes;
3) Switch ON the boiler;
N.B. To ensure correct readings the boiler must have reached normal operating temperature. Testing the boiler
before thermal equilibrium has been attained will give incorrect readings.
5. GAS CONVERSION
The following adjustment and conversion operations must be carried out by qualified personnel. FERROLI Limited accepts
no liability for damage to property or personal injury resulting from tampering with the boiler by unauthorised persons.
To convert the boiler from Natural gas to LPG and vice versa, the burner injector must be replaced (see fig. 43). Gas
pressures must then be adjusted on the gas valve as
described in the paragraph 4.01.
Note: After converting the boiler from natural gas to
liquid gas, fit the orange plate in the conversion kit
near the data plate.
Note: injector diameters and pressures at the main
burner are given in Technical Data (1.03).
Sigma
Injector
Gas valve
Gas cock
Full sequence
automatic control
Fig. 43
21
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