Immergas EOLO Mini Technical Documentation Manual

Immergas EOLO Mini Technical Documentation Manual

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Technical documentation
- GENERAL FEATURES
EOLO MINI is a wall-hung boiler for central heating and the production of domestic hot water that
stands out for its compact dimensions (773 x 450 x 250).
The boiler features a microprocessor-controlled electronic board that electronically controls burner
ignition, central heating and d.h.w. temperature and flame modulation.
The unit has a working heat output of 20.000 kcal/h (23,3 kW) and features a standard antifreeze safety
device that ensures operation with temperatures as low as –5°C.
The hydraulic circuit features a copper water-gas exchanger, a 3-way hydraulic valve and a
STAINLESS-STEEL plate exchanger for the instantaneous production of domestic hot water.
Combustion air intake inside the sealed chamber and the expulsion of flues are ensured by a fan. the
correct operation of which is controlled by a pressure switch.
- MAIN DIMENSIONS AND CONNECTIONS
STEME ed 07/03
EOLO Mini
1
Technical documentation
Instantaneous
wall-hung
sealed fan assisted boiler with
compact dimensions
EOLO Mini
DIMENSIONS (mm)
HEIGHT
WIDTH
773
450
CONNECTIONS
HOT WATER
GAS
G
U
E
1/2 "
1/2 "
1/2 "
V - power connection
G - gas supply
U - domestic hot water outlet
E - domestic hot water inlet
R - system return
M - system flow
room
DEPTH
250
SYSTEM
R
M
3/4 "
3/4 "
EOLO MINI

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Summary of Contents for Immergas EOLO Mini

  • Page 1 EOLO Mini - GENERAL FEATURES EOLO MINI is a wall-hung boiler for central heating and the production of domestic hot water that stands out for its compact dimensions (773 x 450 x 250). The boiler features a microprocessor-controlled electronic board that electronically controls burner ignition, central heating and d.h.w.
  • Page 2: Main Component Parts

    7 - Positive signal pressure point 16- D.h.w. exchanger 25- Overheat safety thermostat (100 8 - Negative signal pressure point 17- 3 bar safety valve ºC) 9 - Fan safety pressure switch 18- System drain valve STEME ed 07/03 EOLO MINI...
  • Page 3: Control Panel

    1 - Boiler thermo-pressure gauge 6 - Central heating temperature selector 2 - Flame presence yellow indicator lamp 7 - Programmer clock hole plate 3 - Boiler block led indicator lamp 4 - 0/SUMMER/WINTER/RESET switch STEME ed 07/03 EOLO MINI...
  • Page 4: Hydraulic Circuit

    20 - Overheat safety thermostat (TS2) (from serial number 2238341) (fitted until serial number 2238340) G - Gas supply U - Hot water outlet E - Hot water inlet R - System return M - System delivery STEME ed 07/03 EOLO MINI...
  • Page 5: Operation

    - A = Circulator at top speed - B = Circulator at second speed - C = Circulator at top speed with by-pass (optional) on - D = Circulator at second speed with by-pass (optional) on STEME ed 07/03 EOLO MINI...
  • Page 6: Primary Heat Exchanger

    105 ºC (2) and the NTC delivery The outlet pipe features the 100 °C safety sensor (7). thermostat (6) and the NTC delivery sensor (7). On the outlet pipe is fitted anything. STEME ed 07/03 EOLO MINI “S”...
  • Page 7 0.8 bar and a capacity of 6 l. It is connected to the return manifold (2) by means of a copper pipe (5) with threaded fittings. STEME ed 07/03 EOLO MINI...
  • Page 8: Secondary Circuit

    (1). From serial number 1511772 for NIKE Mini and from serial number 1507922 for EOLO Mini, the hydraulic coupling to the 3-way valve (cold water inlet) is of the coupling type with OR seal (2), while previously it was obtained by means of a threaded union with flat seal.
  • Page 9 To perform this operation, the lid (6) will have to be removed and the two parts separated that make up the valve body after loosening the socket-head retention screws (9). The 3-way valve assembly also features the housings for the system filling stopcock (13) and the 8 l/min flow limiting device (8). STEME ed 07/03 EOLO MINI...
  • Page 10 “8”. At the end of the supply, the pressure difference upstream and downstream of the d.h.w. valve “3” is cancelled out, allowing the valve to return to idle position. STEME ed 07/03 EOLO MINI...
  • Page 11: Gas Circuit

    This is a low-voltage coil controlled by the modulation circuit of the adjustment board. This controls the gas valve stabiliser and permits changing the outlet pressure in a way proportionate to the signal that runs through it. STEME ed 07/03 EOLO MINI...
  • Page 12 Detection electrode (4) This is controlled by the adjustment board and detects burner ignition. It is positioned on the front of the burner on the ramp alongside the ignition electrodes. STEME ed 07/03 EOLO MINI...
  • Page 13: Gas Adjustments

    1) Modulation coil clockwise to increase burner pressure 2) Minimum output setscrew 3) Maximum output setscrew and anticlockwise to decrease it. 4) Gas valve outlet pressure point 5) Gas valve inlet pressure point 6) Protection cap STEME ed 7/03 EOLO MINI...
  • Page 14: Changing Type Of Gas

    (see table below) can be done by means of the respective trimmers mounted on the modulation board (see modulation board operation). Soft ignition values in mbar (mm H Natural gas EOLO Mini 5 (50) 13 (130) STEME ed 07/03...
  • Page 15 In the same way, the negative pressure point (9) is connected to a Y-pipe (11) which is in turn connected to the draught diverter (5) and to the negative pressure point of the flue pressure switch (4). STEME ed 07/03 EOLO MINI...
  • Page 16: Flue Pressure Switch

    (5) from which it extracts the flue and conveys these into the exhaust pipes to which the boiler is to be connected. This is controlled by the adjustment board and its operation essentially coincides with that of the burner. STEME ed. 07/03 EOLO MINI...
  • Page 17 Technical documentation EXTRACTION AND EXHAUST SYSTEMS (see extraction and exhaust end instructions ) EOLO Mini is set for connecting to the special extraction/exhaust coupling ducts. - EXHAUST Connection to the exhaust ducts is done by means of a flange (1) or a curved flange to be fitted to the connector (4) on the top part of the sealed chamber, placing in between a special shaped seal (6).
  • Page 18 φ 125 mm external concentric pipe. Max possible length (extraction + exhaust) is 33 straight metres. To prevent condensation problems, the exhaust pipe should not be more than 12 m long STTEME ed. 07/03 EOLO MINI...
  • Page 19: Electrical Circuit

    - Flame presence yellow led - Room thermostat jumper The electrical circuit of the EOLO MINI boiler is fully controlled by an electronic modulation board that controls all the electrical devices on the machine. Depending on the type of request and the state of the safety devices, the board ignites the burner and regulates the temperature of the d.h.w and central heating.
  • Page 20: Low-Voltage Circuit

    - hot water and heating operation (WINTER) button (IG) - resets after the no ignition or high temperature RESET safety device have been activated (the RESET position operates at mains voltage, closing a contact that acts on the ignition circuit) STEME ed 07/03 EOLO MINI...
  • Page 21 If fitted together with clock (OP) it must be connected to terminals 8 and 9 of connector M3 after removing jumper P1. LOADS Modulation coil This is powered by the modulation board with a variable signal. (MOD) Permits changing gas pressure to the burner. STEME ed 07/03 EOLO MINI...
  • Page 22: Heating Phase

    RELAY V/G powers both coils of gas valve (VG). Burner ignition is detected by the ionisation electrode (E3). NOTE: Every time the boiler shuts off after reaching the set temperature, the adjustment circuit stops burner operation in heating phase for 180/30 seconds. STEME ed 07/03 EOLO MINI...
  • Page 23 With the consensus of the overheating thermostats (TS1 and TS2 ), the closing of the RELAY V/G contact energises both coils of the gas valve (VG). Burner ignition is detected by the ionisation electrode (E3). STEME ed 07/03 EOLO MINI...
  • Page 24 NIKE Mini, controls the fan (MV) and flue pressure switch (SV). The EOLO Mini board can also be used on the NIKE Mini (and not vice versa) without any adjustment or controls and safety device bypass being required.
  • Page 25 With main switch (IG) in SUMMER or WINTER position, when the temperature read by the NTC supply sensor (NM) falls below 8ºC, the board triggers the generator in heating phase with burner at minimum heating output until a boiler temperature of 43°C is reached. STEME ed 07/03 EOLO MINI...
  • Page 26 Permits energising the programmer clock at 230 V AC (optional). This can be fitted on Programmer clock the boiler dashboard after removing the closing plate. (OP) The signal is operative with main switch in 0, SUMMER and WINTER position STEME ed 07/03 EOLO MINI...
  • Page 27: Fan Relay

    (from serial number 2238341) The tripping of the safety device is indicated on the control panel by the lighting up of led LD2 (red) and the flashing of led LD1 (yellow). STEME ed 07/03 EOLO MINI...
  • Page 28 OFF = 1 s (no water, pump blocked etc.) - burner operating flashing - overheating block or presence of parasite flame - ignition failure block - flue pressure switch (SV) interception failure simultaneous flashing STEME ed 07/03 EOLO MINI...
  • Page 29 Technical documentation Technical documentation EOLO Mini OPERATION SEQUENCE Heating phase Hot water phase POWER SUPPLY POWER SUPPLY Main switch in WINTER position Main switch SUMMER or WINTER position ⇓ ⇓ CLOSING OF ROOM THERM. SWITCH HOT WATER OPERATION REQUEST Room thermostat request Drawing of hot water ⇓...
  • Page 30 Technical documentation Technical documentation EOLO MINI TECHNICAL DATA Nominal heat input kW (kcal/h) 25.6 (21978) Minimum heat input kW (kcal/h) 10.9 (9412) Nominal heat output (useful) kW (kcal/h) 23.3 (20000) Minimum heat output (useful) kW (kcal/h) 9.3 (8000) Efficiency at 100 % 91.0...
  • Page 31: Combustion Parameters

    13000 15,1 1,81 1,35 12,9 1,33 16,6 12000 14,0 1,68 1,25 11,1 1,23 14,3 11000 12,8 1,55 1,16 1,14 12,2 10000 11,6 1,42 1,06 1,04 10,2 9000 10,5 1,29 0,96 0,95 8000 1,16 0,86 0,85 STEME ed 07/03 EOLO MINI...

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