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Immergas EOLO Superior PLUS 24, Technical Documentation Manual, Page: 17 / 27

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Immergas EOLO Superior PLUS 24 Technical Documentation Manual Download Page 17

Technical documentation

Technical documentation

STESP ed 02/02

17

EOLO SUPERIOR PLUS

ELECTRICAL CIRCUIT

CENTRAL-HEATING PHASE

(*) only on the Honeywell VK 4105 gas valve, the main coils are powered at mains voltage by means of a
diode bridge (fitted in the connection connector)

When the mainr switch (IG) is in WINTER position, it powers the modulation card and enables operation in
central heating mode.
When the room thermostat contact (TA) is closed, the low-voltage circuit starts the pump (MP) by closing the
contact of relay RP.
The circulation of water causes the pump pressure switch (SP) to close and, because this is connected in series
with the NC contact of the flue pressure switch (SV), the coil of relay K5 is energised.
Meanwhile, the adjustment circuit causes the deviation of the relay contact R3V.
This way, the motor (M) is powered of the 3-way valve (VD), which continues to operate until the limit
switch "A" opens once the central heating position has been reached.
If the temperature read by the NTC heating sensor (NR) is below that set on the control panel with the heating
potentiometer, the low-voltage circuit excites the relay K5 and starts the fan (MV) commanding the relay RV.
The consequent deviation of the flue pressure switch (SV) powers the relay RT the contact of which, on
closing, enables the control unit (IGN. CARD) to start the ignition cycle, commanding first of all the ignition
electrodes (E1-E2) and then, with the consensus of the overheating thermostat (TS), both the main coils of the
gas valve (V/G).
Ignition of the burner is detected by the control unit (IGN. CARD) by means of the ionisation electrode (E3).

Operation with Remote Friend Control

The main switch (IG) in SUMMER position powers the modulation board and remote control (CAR).
If the conditions found by the remote control (CAR) require ignition in central heating phase
(

SUM/WINT switch in WINTER position, central-heating temperature setting above that read by the

central-heating sensor NR requested by the time programmer, room temperature adjustment above that
read)

, the board powers pump MP through relay RP contact.

Burner ignition then occurs as described above.

NOTE

: In both cases, at each switch-off due to temperature having been reached, the modulation board

stops burner operation during central-heating phase for 180 seconds., which can be reduced to 30
seconds by intervening on the special bridge (J1) 

(see modulation card operation).

Summary of Contents for EOLO Superior PLUS 24

Page 1: ...ures a standard anti frost device which protects it down to temperatures of 5 C The hydraulic circuit features a high head copper water gas exchanger an electric 3 way valve and an adjustable system by pass Combustion air flow into the sealed chamber and flue extraction are ensured by a fan the correct operation of which is controlled by a differential pressure switch The appliance is prearranged ...

Page 2: ...I MI 1 2 3 4 3 4 V power connection G gas supply RB boiler return MB boiler flow A system filling RI system return MI system flow STORAGE TANK UNIT DIMENSIONS mm 80 l 105 l 120 l HEIGHT 850 1020 850 WIDTH 500 500 600 DEPTH 500 500 600 CONNECTIONS SYSTEM DOMESTIC HOT WATER RB MB E U RC 3 4 1 2 1 2 1 2 V power supply U d h w outlet RB boiler return MB boiler flow E d h w inlet RC recirculation optio...

Page 3: ...ustion chamber 13 Overheat safety thermostat 14 Circulator 15 3 bar safety valve 13 Pump pressure switch 17 3 way valve 18 Adjustable automatic by pass 19 Positive signal pressure point 20 Negative signal pressure point 21 Draught diverter 22 Primary exchanger 23 Ignition and detection electrodes 24 Burner CONTROL PANEL 1 Green heating operating indicator 2 Heating temperature selector 3 D h w tem...

Page 4: ...IOR PLUS PLUS STORAGE TANK MAIN COMPONENTS Storage tank 80 l Storage tank 105 l Storage tank 120 l 1 D h w NTC sensor 2 D h w drain valve 3 Thermometer 4 D h w expansion vessel 5 Coil 6 Anode CONTROL PANEL 1 Storage tank ON OFF thermostat setting cap 2 Storage tank thermometer ...

Page 5: ... RB Storage tank return MB Storage tank flow G Gas supply U Hot d h w outlet E Cold d h w inlet RC Re circulation optional PRIMARY CIRCUIT BOILER CIRCUIT The primary circuit with relevant control and safety devices operates every time there is a central heating or d h w request OPERATION The heat contained in the combustion products is absorbed by the copper blades of the water gas exchanger 5 whi...

Page 6: ...on its position gives the system greater or less head The graph below refers to the pump operating at top speed with A Bypass disconnected screw fully tightened B Standard bypass adjustment screw tightened by 4 5 turns with respect to fully tightened position C Bypass open screw fully loose PRIMARY EXCHANGER This is a water gas blade type exchanger with copper pipes and fins at the outlet of which...

Page 7: ...e or no water in the boiler circuit Prevents primary exchanger overheating Automatic air vent 4 Automatically expels any gaseous substances in the boiler circuit Secured to the water side of the expansion vessel 3 bar safety valve 2 Fitted to the front part of the 3 way monobloc and prevents safety pressure 3 bar being exceeded in the circuit When this trips water exits from the flow pipe One way ...

Page 8: ...nsequent movement of the valve to d h w position see 3 way electric valve closes the system return pipe RI and at the same time opens the return pipe of the storage tank coil RB This way circulation is allowed in the coil 3 which through its walls enables the cold domestic water to absorb the heat contained in the primary circuit water In this phase the central heating function is disconnected as ...

Page 9: ...the top part of the storage unit near the cold domestic water inlet Besides an 8 bar valve 7 d h w circ which prevents safety pressure being exceeded inside the storage tank it comprises a flow limiting device 12 l min 80 l and 105 l versions only an one way valve 8 d h w circ to prevent the increase in pressure resulting from d h w heating causing a return towards the cold water system ON OFF the...

Page 10: ...ed by energising the motor 1 Operation When the central heating or d h w position has to be achieved the motor 1 is operated by the modulation board Operation of the motor whose number of revs is reduced by a special system of gears involves rotation of a disc 6 fastened eccentrically on the shaft of the motor Movement of this disc causes the movement of a special coupling 5 which at each 180 rota...

Page 11: ...n alongside Then proceed as follows depending on the gas valve fitted to the boiler VALVE VK 4105 M with yellow protection cap Minimum pressure adjustment After interrupting the power supply to the modulation coil turn screw 3 clockwise to increase pressure to the burner and anticlockwise to decrease it Maximum pressure adjustment operation to be performed after minimum pressure adjustment Do a d ...

Page 12: ...lockwise to increase the burner pressure and anticlockwise to decrease it Minimum pressure adjustment to be done after maximum pressure adjustment After interrupting power to the modulation coil turn screw 2 clockwise to increase burner pressure and anticlockwise to decrease it 1 Modulation coil 2 Minimum output set screw 3 Maximum output set screw 4 Gas valve outlet pressure point 5 Gas valve inl...

Page 13: ...AND EXHAUST SYSTEMS see extraction and exhaust end instructions EXHAUST See EOLO Maior EXTRACTION See EOLO Maior EXTRACTION EXHAUST KIT Coupling type horizontal concentric kit 60 100 See EOLO Maior Coupling type horizontal concentric kit 80 125 See EOLO Maior Coupling type vertical concentric kit 60 100 See EOLO Maior Coupling type vertical concentric kit 80 125 See EOLO Maior Coupling type separa...

Page 14: ...croprocessor electronic board that controls boiler functions The control and safety devices work in part at mains voltage and in part at low voltage 230 V AC CIRCUIT SAFETY DEVICES AND CONTROLS Detection electrode E3 This detects ignition of the burner by whose flame it is invested It is connected to the detection circuit of the ignition unit Fuse This interrupts power to the circuit when amp draw...

Page 15: ...d in summer or CAR or winter see modulation board operation LOW VOLTAGE CIRCUIT SAFETY DEVICES AND CONTROLS Central heating sensor NR Allows the modulation board to detect the temperature of the primary circuit water flow If this sensor stops working burner operation stops both in central heating and d h w modes It is positioned at the outlet of the main exchanger Sensor NTC 10 kohm 25 ºC Control ...

Page 16: ...d See Remote Friend Control operation CAR Room thermostat TA external optional This enables operation in central heating phase when the room temperature is below that required In case of CAR installation the room thermostat must be disconnected without resetting the pre existing bridge P1 Double clean contact switch LOADS Display card This displays burner operation orange LED operation in d h w ph...

Page 17: ...age circuit excites the relay K5 and starts the fan MV commanding the relay RV The consequent deviation of the flue pressure switch SV powers the relay RT the contact of which on closing enables the control unit IGN CARD to start the ignition cycle commanding first of all the ignition electrodes E1 E2 and then with the consensus of the overheating thermostat TS both the main coils of the gas valve...

Page 18: ... this is connected in series with the NC contact of the fume pressure switch SV the coil of relay K5 is energised Meanwhile the adjustment circuit causes the deviation of the relay contact R3V This way the motor M is powered of the 3 way valve VD which continues to operate until the limit switch N opens once the d h w position has been reached The low voltage circuit excites the relay K5 and start...

Page 19: ...rol panel by means of the central heating potentiometer RISC the adjustment circuit excites relay K5 and starts the fan MV controlled by relay RV The consequent deviation of the contact of the fume pressure switch SV results in relay RT being powered and the relevant contact closing This powers the control unit IGN CARD and starts the ignition cycle During the ignition phase the power to the modul...

Page 20: ... the difference between the temperature set by means of the d h w potentiometer D H W and that measured by the d h w sensor NB When the temperature measured by the d h w sensor NB exceeds that requested the contact of relay RT is opened and after post operation times also the contacts of relays RP pump and RV fan When the temperature drops again the relays are once again powered to start the new i...

Page 21: ...ates whether d h w operation mode SUMMER or d h w and central heating mode WINTER are enabled closed WINTER open SUMMER Overheating lock IC1 This is a signal which through an optoinsulator indicates input to the main coils of gas valve V G This permits the board to pinpoint and indicate with an error code E02 any operation of the safety overheat thermostat TS 230 Vac coils powered 0 Vac coils not ...

Page 22: ...lve Permits changing the pressure of the gas to the burner Pump relay RP This is a single pole relay that powers the circulator MP and which is excited when operation is required Remote control CAR external optional see CAR operation This signal permits displaying on the remote control panel the boiler temperature operation in d h w or central heating modes the codes of the alarms that have trippe...

Page 23: ...uently the pressure of the gas to the burner during the ignition phase from min up to 2 3 of max regulated on the valve By keeping the reset button PU1 pressed during d h w or central heating the power to the coil is blocked at the slow ignition setting SAFETY DEVICES Circulator antilock The circulator MP is operated for 150 seconds after 24 hours of inactivity with the SUM WINT switch in SUMMER p...

Page 24: ...g d h w antifreeze and chimneysweep mode The value set during the heating and domestic hot water circuit temperature adjustment for 5 seconds the letters CE with the CAR installed and the main switch in position The code number of the safety device that has tripped 01 no ignition lock 02 overheating safety device thermostat lock 03 flue pressure switch contact not deviated NO 05 NTC flow sensor fa...

Page 25: ...rd powers the circulator and the electric 3 way valve The valve is moved to d h w position CLOSING OF PUMP PRESSURE MICROSWITCH The circulation of water inside the primary circuit causes the closing of the pump pressure switch FLUE PRESSURE SWITCH CONTACT CONTROL The card checks the correct position of the flue pressure switch contact NC normally closed FAN POWER SUPPLY The modulation board powers...

Page 26: ...re of heating circuit ºC 90 Adjustable heating temperature ºC 38 85 Total volume of expansion vessel l 8 Expansion vessel preloading bar 0 8 Amount of water in boiler l 4 0 Available head capacity 1000 l h kPa m H2O 39 4 0 Working heat output for the production of hot water kW Kcal h 27 9 24000 D h w adjustable temperature ºC 20 60 80 l and 105 l storage tank unit d h w flow limiting device l min ...

Page 27: ...ner nozzle pressure mbar mm H2O Burner gas flow kg h Burner nozzle pressure mbar mm H2O Burner gas flow kg h Burner nozzle pressure mbar mm H2O 24000 27 9 3 18 9 9 101 2 37 28 2 287 2 33 35 7 364 23000 26 7 3 05 9 0 92 2 27 26 1 266 2 24 32 8 334 22000 25 6 2 92 8 2 83 2 18 24 1 246 2 14 30 0 306 21000 24 4 2 79 7 4 75 2 08 22 2 226 2 05 27 5 280 20000 23 3 2 67 6 7 68 1 99 20 4 208 1 96 25 0 255 ...

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