Immergas EOLO Star Manual De Instrucciones página 280

3.2 Plumbing diagram - Eolo Star 23 kW.
ES
Key:
PT
1 - Domestic circuit adjustment NTC sensor
2 - Domestic circuit flow switch
3 - Gas valve
4 - Flow limiter
GR
5 - Drain cock
6 - Main burner
7 - Rapid type exchanger
8 - Fume extraction fan
PL
9 - Sealed chamber
10 - Fume pressure switch
11 - Fume extractor hood
TR 12 - Expansion tank
13 - NTC limit and adjustment sensor
14 - Overtemperature safety thermostat
15 - Automatic air valve
CZ
16 - Circulating pump
17 - System water pressure switch
18 - Automatic by-pass
19 - 3 bar safety valve
CS
20 - Filler cock
G - Gas supply
AC - Domestic hot water outlet
SI
AF - Domestic cold water inlet
R - System return
M - System delivery
HU
RU
3.3 Troubleshooting.
RO
N.B.: Maintenance must be performed by qualified personnel (e.g. Im-
mergas Technical Assistance Service).
- Smell of gas. Caused by leaks from gas circuit pipes. Check tightness of
IE the gas supply circuit.
- The fan works but ignition discharge does not occur on the burner train.
The fan may start but the safety air pressure switch does not change the
contact. Make sure:
1) the intake/exhaust duct is not too long (over permissible length).
2) the intake/exhaust duct is not partially blocked (on the exhaust or
intake side).
3) the diaphragm on the fume exhaust is adequate for the length of the
intake/exhaust ducts.
4) the sealed chamber is perfectly tight.
5) the fan power supply voltage is not less than 196 V.
- Irregular combustion (red or yellow flame). This may be caused by a dirty
burner, blocked reed valve, or incorrect installation of the intake/exhaust
terminal. Clean the above components and ensure correct installation of
the terminal.
- Frequent activation of the safety overtemperature thermostat. This may
be caused by low water pressure in the boiler, insufficient water circula-
tion in the heating circuit, blocked circulating pump or by an anomaly
in the boiler control card. Check on the pressure gauge that the system
pressure is within the fixed limits. Check that the radiator valves are not
all closed.
- Presence of air in the system. Check opening of the special air valve cap
(see fig. on page 274). Make sure the system pressure and expansion
tank precharge values are within the set limits; the precharge value for
the expansion tank must be 1.0 bar, and system pressure between 1 and
1.2 bar.
- Ignition block: see pages 276 and 263 (electrical connection).
278
- Reduced water delivery: if, due to scale (calcium and magnesium salts),
a decrease in performance is noted during domestic hot water delivery, it
is advisable to have chemical descaling carried out by qualified personnel
(e.g. Immergas Technical Assistance Service). Chemical descaling must
be carried out on the domestic circuit side of the bithermal exchanger,
in accordance with the required technical procedures. A non-corrosive
descaling product must be used in order to preserve exchanger integrity
and efficiency. Cleaning must be done without using mechanical tools
that can damage the exchanger.
3.4 Converting the boiler to other types of gas.
When converting the boiler for a different type of gas to that specified on
the dataplate, the relative conversion kit must be requested for quick and
easy conversion.
Boiler conversion must be carried out by qualified personnel (e.g. Immergas
Technical Assistance Service).
To convert to another type of gas:
- replace the main burner nozzles, making sure to insert the special seal
rings supplied in the kit, between the gas manifold and the nozzles.
- on the boiler keypad, select the gas type parameter (P1) and then select
(nG) for Methane or (LG) for LPG;
select the gas type parameter (P2) for gas G110;
- adjust boiler rated heat output;
- adjust boiler min. heat output in domestic hot water phase;
- adjust boiler min. heat output in heating phase;
- adjust (if necessary) max. boiler heating power;
- seal the gas flowrate control devices (if the adjustments are modified);
- after completing conversion, apply the sticker, present in the conversion
kit, near the dataplate. 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 on page 283.