Wiring Diagram; Troubleshooting; Converting The Water Heater To Other Types Of Gas; Checks Following Conversion To Another Type Of Gas - Immergas CAESAR 14 3 E Instruction Booklet And Warning

3.2 WIRING DIAGRAM.

230 Vac
50 Hz
Power supply
THE X6 CONNECTOR IS
USED FOR AUTOMATIC
INSPECTION

3.3 TROUBLESHOOTING

N.B.: maintenance interventions must be carried
out by a qualified technician (e.g. Immergas
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
occur on the burner ramp. The fan may start
but the safety air pressure switch does not
switch the contact over. Make sure:
1) 1) the intake-exhaust duct is not too long
(over allowed length).
2) 2) the intake-exhaust pipe is not partially
blocked (on the exhaust or intake side).
3) the diaphragm of the flue gas exhaust is
adequate for the length of the intake-exhaust
duct.
4) that the sealed chamber is kept in good
conditions.
5) the fan power supply voltage is not less than
196 V.
- Irregular combustion (red or yellow flame).
This may be caused by: dirty burner, incorrect
combustion parameters, intake - exhaust
terminal not correctly installed. Clean
the above components and ensure correct
installation of the terminal.
- Frequent activation of the overheating
temperature 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. 2.6 and 1.4 (electric
connection).
- Low water flow: if, as a result of lime scale
(calcium and magnesium), the domestic hot
water system does not work properly contact a
qualified technician for descaling e.g. Immergas
N.B. THE USER INTERFACE
IS ON THE WELDING SIDE
OF THE BOILER BOARD
After-Sales Technical Service according to good
practice. To preserve integrity and efficiency
of 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 boiler has to be converted to a different gas
type to that specified on the data plate, request
the relative conversion kit for quick and easy
conversion.
Boiler conversion must be carried out by a
qualified technician (e.g. Immergas After-Sales
Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- remove the voltage from 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;
- apply voltage to the appliance;
- Use the push button control panel to select 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 devices (if adjusted);
- after completing conversion, apply the sticker,
present in the conversion kit, near the data-
plate. Using an indelible marker pen, cancel
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).
17 - IE
Key:
B2 - Domestic hot water probe
B6 - Domestic hot water flow meter
B9 - DHW inlet probe
DS1 - Display
E3 - Ignition/detection electrodes
F1 - Phase fuse
F2 - Neutral fuse
M20 - Fan
R5 - Domestic hot water temperature selector
S2 - Stand-by - On Button
S3 - Reset button
S6 - Flue pressure switch
T2 - Ignition transformer
Y1 - Gas valve
Y2 - Gas valve modulator
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 technician
(e.g. Immergas After-Sales Technical Assistance).
Burner adjustment 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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