Ariston HS C 24 FF NG Installation And Servicing page 59

Maximun Heating Power adjustment
The maximum heating power can be adjusted to between the
maximum power allowed by the boiler and the minimum power).
The display shows the value between "100" and 0 of this interval.
To check the maximum heating power, access parameter 231,
check the value and, if necessary, modify it as indicated in the
Table summarising changes.
Checking slow ignition power
The soft light can be adjusted between the maximum power and
the minimum power.
To check the slow ignition power, access parameter 220.
If needed, change the parameter value until suitable pressure
is achieved.
Heating ignition delay adjustment
This parameter can be used to set the delay time, before the
subsequent reignition of the burner after it has switched off on
reaching the desired temperature.
To set the delay in minutes between 0 and 7 minutes, access
parameter 236.
The table indicate the existing relationship between the gas
pressure at the burner and the boiler power level in heating
mode.
Heating gas pressure
Gas/Gaz Heat output / Puissance chaudière (kW)
G20 mbar
Parameter / Paramètre 2 3 1
G31 mbar
Parameter / Paramètre 2 3 1
Table summarising changes
lower Wobbe index
(15°C, 1013 mbar)
Gas inlet pressure
Gas Burner Pressure
maximum D.H.W.
maximum heating absolute
(parameter 230)
minimum
Soft light (param. 220)
Maximum heating power adjustment-
parameter 231
Ignition delay- parameter 236
Main Burner jets
Ø burner jets
max D.H.W.
Max/min consumption
(15°C, 1013 mbar)
max Heating
(G.N.= m /h) (GPL =
3
Kg/h)
minimum
HS C 24 FF NG
G20 G31
MJ/m 45,67 70,69
3
mbar 20 37
12,2 35,5
mbar
12,2 35,5
mbar
(100) (100)
2,3 6,8
mbar
4,5 6,8
mbar
(43) (5)
50 71
3 minutes
11
nr.
1,32 0,8
mm
2,73 2,00
1,59 2,00
1,16 0,85
Checking maximum absolute heating power
(only in case of gas change or P.C.B. replacement)
To check/modify the maximum absolute heating power, access
the gas valve and proceed as follows:
1. Loosen screw "2" (Fig. b) and insert the pressure gauge
connection pipe into the pipe tap.
2. Disconnect the air chamber compensation tube.
3. Switch the boiler on at maximum heating power, enabling
the "Chimney sweep" function (press the RESET key for 10
second).
The supply pressure should correspond to the value shown
in the "Table summarising changes" according to the type of
gas for which the boiler is designed. If it does not correspond,
access parameter 230 and turn the encoder to modify the
value until the pressure has been reached.
4. When the check is complete, tighten screw "2" and make sure
it is securely in place.
5. The "Chimney sweep" function is deactivated either
automatically after 30 minutes or when the E
pressed.
Pression gaz chauffage
9,5 11,9 14,3 16,7 19,1 21,5 24,0
2,3 3,7
0 39
6,8 9,9
0 59
Gas Changeover
The boiler may be adjusted so that it may be used with Liquid
Gas (G31) instead of methane gas (G20) or vice-versa.
The adjustment must be performed by a Qualified Technician
using the special Kit.
The following procedures must be completed:
1. Switch off the electrical supply to the appliance.
2. Shut off the gas valve.
3. Disconnect the electrical connections to the boiler.
4. Access to the combustion chamber, as indicated in
the paragraph "Instructions for opening the casing and
performing an internal inspection".
5. Replace the nozzles and attach the labels as indicated in the
instruction sheet supplied with the Kit.
6. Check that all connections are gas-tight.
7. Start up the boiler.
8. Perform the gas adjustment (refer to the paragraph
"Checking the gas adjustment"):
- check the domestic water maximum power
- check the minimum power
- check the maximum absolute heating power
- adjust the maximum adjustable heating power
- check the slow ignition
- adjust the heating ignition delay
9. Carry out the combustion analysis.
COMMISSIONING
button is
sc
4,8 6,6 8,3 10,4 12,2
45 50 56 61 100
13,9 18,2 24,2 29,1 35,5
67 74 80 85 100
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