Wiring Diagram; Troubleshooting; Converting The Water Heater To Other Types Of Gas; Checks Following Conversion To - Immergas Caesar 14 4 ERP Instruction And Recomendation Booklet

3.2 WIRING DIAGRAM.

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3.3 TROUBLESHOOTING.

N.B.: maintenance operations must be carried
out by an authorised company (e.g. Authorised
After-Sales Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing efficiency of gas intake
circuit.
- The fan works but ignition discharge does not
take place on the burner ramp. The fan may
start but the safety air pressure switch does not
switch the contact over. Make sure:
1) that the intake-exhaust duct is not too long
(over allowed length).
2) that the intake-exhaust duct is not partially
blocked (on the exhaust or intake side).
3) the diaphragm of the flue exhaust is adequate
for the length of the intake-exhaust duct.
4) that the sealed chamber is sealed perfectly.
5) the fan power supply voltage is not less than
196 V.
- Irregular combustion (red or yellow flame).
Can be caused by: dirty burner, clogged lamel-
lar pack, intake - exhaust terminal not installed
properly. Clean the above components and
ensure correct installation of the terminal.
- Frequent activation of the overheating tem-
perature or safety thermostat. It can depend
on an anomaly on the water heater P.C.B. or
and anomaly of the regulation NTC probe.
- Ignition block see par. 2.5 and 1.4 (electric
connection).
- Poor water flow: if, as a result of lime scale (cal-
cium and magnesium), the domestic hot water
system does not work properly contact an au-
thorised company for descaling e.g. Authorised
After-Sales Technical Service according to good
practice. To preserve integrity and efficiency of
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the heat exchanger, a non corrosive descaler
must be used. Cleaning must be carried out
without the use of tools which can damage the
heat exchanger.
3.4 CONVERTING THE WATER HEATER
TO OTHER TYPES OF GAS.
If the appliance needs to be converted to a dif-
ferent gas type to that specified on the data plate,
request the relative conversion kit for quick and
easy conversion.
The gas conversion operation must be carried
out by an authorised company (e.g. Authorised
Technical After-Sales Service).
To convert to another type of gas the following
operations are required:
- disconnect the appliance;
- replace the main burner injectors, making sure
to insert the special seal rings supplied in the
kit, between the gas manifold and the injectors;
- re-power the appliance;
- Use the push button control panel to select the
the gas parameter type (P2) and then select
(nG) in case of Methane supply or (LG) in the
case of LPG;
- adjust the water heater nominal heat output;
- adjust the water heater minimum heat output;
- seal the gas flow rate regulation devices (if set-
tings are modified);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near
the data nameplate. Using an indelible marker
pen, delete the data relative to the old type of
gas.
These adjustments must be made with reference
to the type of gas used, following that given in
the table (Par. 3.13).
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Key:
B2 - Domestic hot water probe
B6 - Domestic hot water flow meter
B9 - Domestic hot water inlet probe
DS1 - Display
E3 - Ignition / detection electrode
F1 - Phase fuse
F2 - Neutral fuse
M20 - Fan
R5 - Domestic hot water temperature selector switch
S2 - Stand-by / ON Button
S3 - Reset button
S6 - Flue pressure switch
T2 - Ignition transformer
Y1 - Gas valve
Y2 - Gas valve modulator
1 - 230 Vac 50 Hz power supply
2 - The X6 connector is used for automatic inspec-
tion
3 - N.B.: the user interface is on the welding side of
the boiler board
4 - Blue
5 - Brown
6 - Yellow/Green
7 - Black
8 - Grey
9 - White
10 - Red
3.5 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
After making sure that conversion was carried
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that:
- there is no flame in the combustion chamber
- the burner flame is not too high or low and that
it is stable (does not detach from burner)
- the pressure testers used for calibration are
perfectly closed and there are no leaks from
the gas circuit.
N.B.: all water heater adjustment operations
must be carried out by a qualified company (e.g.
Authorised After-Sales Assistance). Burner ad-
justment must be carried out using a differential
"U" or digital type pressure gauge, connected to a
Y-shaped pipes to be placed on the small silicone
pipe that goes from the gas valve to the sealed
chamber and to the gas valve outlet pressure
point (part. 4 fig. 3-3), keeping to the pressure
value given in the table par. 3.13 according to the
type of gas for which the water heater is prepared.
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