Ariston 41-116-05 GAS Adjustments, Maintenance, Rffi, Changing the Type of GAS

5. GAS ADJUSTMENTS TABLE 5.1

CATEGORY II2H3+

Lower Wobbe Index (15°C;1013mbar)

Nominal Delivery Pressure

Minimum Delivery Pressure

15 RFFI

Main Burner: n. 8 jets (ø ) Restrictor

Consumption (15°C; 1013mbar) Consumption (15°C; 1013mbar) Gas Burner Pressure:

max - min

MJ/m3h mbar mbar

mm

ø

m3/h Kg/h

mbar

Methane Gas

G20

45.67

20

17

1.30

---

1.62

----

8.5

Liquid Butane Gas	Liquid Propane Gas
G30	G31
80.58	80.58
29	37
20	25
0.77	0.77
3.3	3.3
----	----
1.21	1.19
22.1	28.8

[1 mbar = 10,197 mmc.a.]

5.1CHANGING THE TYPE OF GAS

FIG. 5.1

VG002Ab

6.MAINTENANCE

The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid. The maximum pressure of the gas to the burner will be equal to the nominal delivery pressure minus the head loss within the gas valve.

The boiler can be converted to use either methane (natural) gas (G20) or LPG (G30 - G31) by an Authorised Service Centre.

The operations that must be performed are the following:

1.Replace the jets on the main burner (see table in section 5);

2.Pay attention to put the gas restrictor if convert the boiler from NG to GPL and to take it out when pass from LPG to NG;

2.Adjust the maximum and minimum thermal capacity values for the boiler (see table in section 5);

3.Replace the gas rating plate;

4.Adjust the maximum thermal power setting;

5.Adjust the soft-light feature (open the cover of the regulation screw on the gas valve (see FIG. 5.1). Rotate clockwise from min. to max. as per installation requirements).

It is recommended that the following inspections be carried out on the boiler at least once a year:

1 - Check the seals for the water connections; replace any faulty seals.

2 - Check the gas seals; replace any faulty gas seals.

3 - Visual check of the entire unit.

4 - Visual check of the combustion process or analysis of combustion by-products (see section 4.5) and cleaning of the burner if needed.

5 - If called for by point. 3, dismantling and cleaning of the combustion chamber.

6 - If called for by point. 4, dismantling and cleaning of the burner jets.

7 - Visual check of the primary heat exchanger:

-check for overheating in the blade assembly;

-clean the exhaust fan if needed.

8 - Adjustment of the flow rate of the gas: flow rate for lighting, partial load and full load.

9 - Check of the heating safety systems:

-safety device for maximum temperature (overheat thermostat);

-safety device for maximum pressure (safety valve).

10- Check of the gas safety systems:

-safety device for lack of gas or flame ionisation (detection electrode);

-safety device for gas cock.

11- Check of the electrical connection (make sure it complies with the instructions in the manual).

12- General check of the combustion by-products of the discharge/ventilation system.

13- Check of the general performance of the unit.

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