Draining The System; Gas Adjustments; Changing The Type Of Gas - Ariston GENUS 27 PLUS Installation Instructions Manual

3.9

Draining the System

4.

GAS ADJUSTMENTS

CATEGORY II2H3+
Lower Wobbe Index (15°C;1013mbar)
Nominal Delivery Pressure
Minimum Delivery Pressure
GENUS 27 BFFI PLUS
Main Burner: n. 15 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Cock Outlet Pressure
max - min
(1mbar = 10,197column of water)
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.
4.1 Changing the Type
of Gas
18
Draining the heating system.
The heating system must be emptied as follows:
- Turn off the boiler;
- Open the drain valve for the system and place a container below to catch the water
that comes out;
- Empty the system at the lowest points (where present). If you plan on not using the
heating system for an extended period of time, it is recommended that you add
antifreeze with an ethylene glycol base to the water in the heating lines and radiators
if the ambient temperature drops below 0°C during the winter.
This makes repeated draining of the entire system unnecessary.
Draining the domestic hot water system.
Whenever there is the danger of the temperature dropping below the freezing point,
the domestic hot water system must be drained as follows:
- Turn off the general water valve for the the household plumbing system;
- Turn on all the hot and cold water taps;
- Empty the remaining water from the lowest points in the system (where present).
MJ/m 3 h
mbar
mbar
mm
m 3 /h
Kg/h
mbar
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 4);
2. Adjust the maximum and minimum thermal capacity values for the boiler (see
table in section 4);
3. Replace the gas rating plate;
4. Adjust the maximum thermal power setting;
CATEGORY II2H3+
Recommended Soft-light Pressure
(mbar)
5. Adjust the soft-light feature;
6. Adjust the delayed lighting feature for the heating system (can be set from 0 to 2
mins.).
Methane Gas Liquid Butane Gas
G20
45.67
20
17
1.25
3.16
----
11.0- 2.0
Methane Gas Liquid Butane Gas Liquid Propane Gas
G20
5-5.4
Liquid Propane Gas
G30
80.58 70.69
30
20
0.72
----
2.35
(*) - 5.0 (*) - 7.0
G30
13.4
G31
37
25
0.72
----
2.32
G31
13.4
400