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4
USE AND MAINTENANCE
4. 1
D.H.W. PRODUCTION
The preparation of hot water is guaranteed
by the glass storage tank unit with magne-
sium anode for the protection of the boiler
unit and inspection flange for its control and
cleaning.
The magnesium anode must be checked
annually and substituted when it is worn,
pain the forfeiture of the guarantee of the
storage tank.
If the boiler does not produce hot water,
make sure that the air has been released
by pressing on the manual vents after hav-
ing switched off the main switch.
4.2
GAS VALVE
The boiler is supplied as standard with a
gas valve, model SIT 848 SIGMA (Fig. 16).
4.3
GAS CONVERSION (fig. 17)
This operation must be performed by
authorised personnel using original Sime
components.
To convert from natural gas to LPG or vice
versa, perform the following operations
–Close the gas cock.
–Replace the nozzle (1) and the gasket (2)
using those supplied in the conversion kit.
–Test all the gas connection using soapy
water or special products. Do not use
open flames.
–Apply the nameplate with the new gas
flow layout.
–Calibrate the maximum and minimum
pressures of the gas valve following the
instructions provided in paragraph 4.3.2.
4.3. 1
New fuel configuration
For access to the installer's parameters,
press simultaneously keys
5 seconds (3 fig. 12).
The parameters will scroll up and down
with the keys
and
pane will show the values of the parameter
PAR 1. If the boiler is a 25/55 methane
(G20) model, SET 20 will be displayed:
To change the fuel to propane (G31), it is
necessary to set SET 22, by pressing the
key
.
The standard display will automatically
return after 10 seconds.
90
The table below shows the SET settings to
enter when the type of gas fuel is changed.
GAS
-
-
and
for
. The display
-
METHANE
(G20)
PROPANE
(G31)
-
-
-
4
5
3
6
2
1
MODELS
PAR 1
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
25/55
20
30/55
21
25/55
22
30/55
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
KEY
1
Upstream pressure intake
2
Intermediate pressure intake
3
Air signal inlet (VENT)
4
Downstream pressure intake
5
Capacity step
6
OFF-SET
1
2
4.3.2
Calibrating the gas valve
pressures
Measure the CO
values with a combustion
2
analyzer.
Sequence of operations:
1) Press and hold the button down for a
.
few seconds
2) Press the button for a few seconds
3) Identify the CO
values at max. power by
2
adjusting the shutter (5 in Fig. 16):
MAX power
CO
(Methane)
CO
(Propane)
2
2
9,0 ±0,3
10,0 ±0,3
4) Press the button for a few seconds
5) Identify the CO
values at min. power by
2
adjusting the OFF-SET regulation screw
(6 in Fig. 16):
MAX power
CO
(Methane)
CO
(Propane)
2
2
9,0 ±0,3
10,0 ±0,3
6) Press the buttons several times to
check the pressures
and
ge them if required.
7) Press the button
once more to quit
the function.
Fig. 16
Fig. 17
.
.
chan-
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