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STEMkW Special ed 01/08

EOLO Mini kW Special

Technical Documentation

EOLO Mini 24-28 kW Special

Compact instantaneous wall-hung room sealed

fan-assisted boiler (type C).

EOLO Mini 24 kW Special

EOLO Mini 28 kW Special

EOLO Mini kW Special is a wall-hung room-sealed fan-assi-

sted boiler (type C) for central heating and producing domestic

hot water, characterised by its extremely compact size.

The boiler is available with an output power of 24 kW Special

(20,640 kcal/h) and 28 kW Special (24,080 kcal/h).

The boilers of the EOLO Mini kW Special series are type-

approved also for installation outside the building in a partly

sheltered location.

Note: By a partly sheltered location we mean a place where the

appliance is not exposed directly to the weather (rain, snow, hail,

etc.).

The boiler is fitted with a new microprocessor controlled p.c.b.

that electronically controls burner ignition, central heating and

d.h.w. temperatures and continuous flame modulation.

With the new electronics the boiler can be connected to a

Remote Control (CAR or CRD) letting you easily control the

boiler remotely.

One of the standard features on the boiler is an

antifreeze

system

that protects against temperatures as low as

-5°C

(optional down to -15°C).

The hydraulic circuit is equipped with a water-gas exchan-

ger in copper, a pump group made in a composite material

and a new 3-way electric valve group

that allows, according

to requirements, boiler water to circulate in the central heating

system or in a STAINLESS STEEL plate exchanger for the

General features.

instant production of domestic hot water. The primary circuit

is fitted with an automatic by-pass and a 3-bar safety valve.

A d.h.w. flow switch enables boiler activation if there is a

d.h.w. request.

The supply of combustion air inside the sealed chamber and

the expulsion of fumes are ensured by a fan whose correct

operation is controlled by a differential pressure switch.

The boiler’s operating parameters are set by turning the knobs,

with the visual display of status, mode and malfunctions by

means of the LEDs on the easy-to-read display panel.

Содержание EOLO Mini

Страница 1: ...EOLO Mini 24 28 kW Special Compact wall hung instantaneous boilers with sealed room EOLO Mini 24 28 kW Special ...

Страница 2: ......

Страница 3: ...tinuous flame modulation With the new electronics the boiler can be connected to a Remote Control CAR or CRD letting you easily control the boiler remotely One of the standard features on the boiler is an antifreeze system that protects against temperatures as low as 5 C optional down to 15 C The hydraulic circuit is equipped with a water gas exchan ger in copper a pump group made in a composite m...

Страница 4: ...pecial main dimensions and connections EOLO Mini 28 kW Special main dimensions and connections Legend G Gas supply AC Domestic hot water flow AF Domestic cold water inlet R C h return M C h flow V Power supply connection Height mm Width mm Depth mm 790 450 310 Connections GAS DOMESTIC WATER SYSTEM G AC AF R M 3 4 1 2 1 2 3 4 3 4 Height mm Width mm Depth mm 790 450 250 Connections GAS DOMESTIC WATE...

Страница 5: ...ssure point 8 Flue pressure switch 9 Sealed chamber 10 Flow probe 11 Safety thermostat 12 System expansion vessel EOLO Mini 24 kW Special main components 13 Combustion chamber 14 Automatic vent valve 15 Boiler pump 16 3 bar safety valve 17 D h w heat exchanger 18 3 way valve motorized 19 Automatic by pass 20 Draining valve 21 Flue hood 22 Primary heat exchanger 23 Ignition and detection electrodes...

Страница 6: ...ssure point 8 Flue pressure switch 9 Sealed chamber 10 Flow probe 11 Safety thermostat 12 System expansion vessel 13 Combustion chamber EOLO Mini 24 kW Special main components 14 Automatic vent valve 15 Boiler pump 16 3 bar safety valve 17 D h w heat exchanger 18 3 way valve motorized 19 Automatic by pass 20 Draining valve 21 Flue hood 22 Primary heat exchanger 23 Ignition and detection electrodes...

Страница 7: ...ure LED Malfunction circulation insuffi cient 5 Temperature LED Malfunction flow probe 6 Temperature LED Malfunction ignition block Control Panel 7 Temperature LED Malfunction overheating block 8 Temperature LED Malfunction flue pressure switch 9 D h w stand by selector Remote Control D h w and C h Reset 10 D h w temperature selector 11 C h temperature selector 12 Boiler gauge ...

Страница 8: ...ety devices is operated each time either a central heating or d h w request is made Operation The heat contained in the fumes produced by combustion is absorbed by the copper blades of the water gas primary exchanger 6 which in turn transfers it to the water circula ting inside thanks to the boiler circulator 15 The water is transferred directly into the system or can be deviated to the instant st...

Страница 9: ... the circulator is working which depending on the position gives the system a bigger or smaller head The characteristic curves are shown in the following graphs A Head available to the system at third speed with automatic by pass B Head available to the system at second speed with automatic by pass EOLO Mini 28 kW Special EOLO Mini 24 kW Special Head m H 2 O Flow rate l h Head kPa A B A B Head m H...

Страница 10: ... outlet flow the central heating NTC flow probe 6 and the overtheating safety thermostat 2 are located The four pipes it is made of are connected in series 1 It is connected to the circulator flow and to the primary circuit flow by means of push fitted pipes 3 and O rings 5 and locked with forks 4 The exchangers of the 24 and 28 versions differ in the number of fins 86 in the 24 version and 103 in...

Страница 11: ...tter 4 moves into both positions The hydraulic part consists of a brass unit 2 Operation in the central heating mode The shutter s 4 counteracting spring 3 is not compressed central heating position keeping passage to the d h w plate exchanger closed and passage to the system flow open Both the spring 3 and shutter 4 are located inside the 3 way brass body 2 Operation in the d h w mode The standar...

Страница 12: ...utomatic air vent 1 It automatically expels gaseous substances from the boiler circuit It is mounted on the circulator flow directly on the pump unit 2 3 bar safety valve 5 This valve prevents the safety pressure being exceeded in the primary circuit 3 bar It fitted on the front of the pump unit 2 and fixed on the outside by means of a fork When this valve triggers water exits from the boiler retu...

Страница 13: ... In this way circulation in the central heating system is preven ted while it is allowed in the plate exchanger inside which the domestic cold water absorbs the heat from the primary circuit water see d h w exchanger So in this phase central heating is off domestic hot water having priority The water water heat exchange occurs inside the d h w exchan ger 3 which is secured to the d h w inlet 1 and...

Страница 14: ...ment board to start the domestic hot water priority phase It consists of two parts one in brass and one in plastic that are coupled together and locked with a pin A G1 4 thread on its body connects it to the filling unit 3 An 7 1 l min 2 bar for model 24 and a 9 2 l min 2 bar flow limiter 1 for model 28 is installed at the flow switch exit D h w exchanger It is a water water exchanger made of stai...

Страница 15: ... B when the burner has to be ignited They are electrically connected in parallel and supplied by mains voltage through a connector 2 Modulating coil 1 This is a low voltage coil controlled by the integrated P C B It controls the gas valve stabiliser and allows the outlet pres sure to be varied in a way proportionate to the DC current running through it Gas circuit Burner The burner consists of hor...

Страница 16: ...ts temperature selector on maximum Turn the brass nut 3 clockwise to increase pressure to the burner and in the opposite direction to reduce it Setting minimum pressure to be done after setting maximum pressure After turning power off to the modulating coil turn the screw 2 clockwise to increase pressure to the burner and in the opposite direction to reduce it Converting the gas type There are spe...

Страница 17: ...burner ignition Air fumes testing holes 7 8 There are two holes at the top on the outside of the sealed chamber which can be accessed from the front they are used to sample combustion air 7 and fumes 8 The two holes are closed by the one plastic cap 6 Flue pressure switch signal pressure points 9 10 There are two pressure points with screw closing at the top on the outside of the sealed chamber Th...

Страница 18: ...e points located at the top of the sealed chamber 9 10 When this switch trips it causes a contact S6 to close that acts on the integrated P C B enabling or preventing burner ignition Intervention pressures Flue pressure switch ON Head mm H2 O OFF Head mm H2 O EOLO Mini 24 28 kW Special 52 5 3 42 4 3 Fan 3 The extractor works downstream from the combustion cham ber and is secured vertically to the ...

Страница 19: ... figure on the right By using the cover 1 on top of the sealed chamber the boiler can be installed outdoors in a partly sheltered place Note in the 28 kW Special version besides the cover 1 the counterframe covering sheet 4 must also be mounted fixing it to the frame with two screws Intake In order to mount the cover 1 the two plates 3 closing the holes at the top of the sealed chamber have to be ...

Страница 20: ...d seal in between 6 The flange differs according to whether the system is used split or concentric In the first case the passage for the intake of combustion air 5 is closed while in the second case it is used To ensure correct operation of the boiler it is necessary to put a diaphragm 7 on the exhaust fitting between it and the flange used 1 There are different diameter diaphragms mounted accordi...

Страница 21: ...oiler are done using the two specific flanges that allow discharge 4 from the centre fitting and aspiration 3 from one of the two side holes The maximum permitted length aspiration exhaust is 33 straight horizontal metres and 41 straight vertical metres To avoid condensate problems the exhaust pipe is limited to a maximum of 5 metres NOTE For the EOLO Mini 28 kW Special version it is compulsory to...

Страница 22: ... Detection electrode E4 Safety thermostat F1 Neutral fuse F2 Line fuse M1 Boiler pump M20 Fan M30 3 way valve R5 D h w temperature trimmer R6 Central heating temperature trimmer R10 Main switch S4 D h w flow switch S6 Flue pressure switch S8 Gas type selector S20 Room thermostat optional T2 Ignition transformer X40 Room thermostat jumper Y1 Gas valve Y2 Gas valve modulator 0 0 530 6 5 1SJNBSZ 4FDP...

Страница 23: ...rom the central heating system to the d h w plate exchanger and vice versa Powered by the integrated P C B 3 way valve M30 Low voltage circuit Allows remote control of boiler operation SUMMER WINTER switch temperature adjustment and display alarm display reset etc and acts as a weekly timer thermostat When CAR is installed the pre existing X40 jumper is to be eliminated Comando Amico Remoto remote...

Страница 24: ... exchanger outlet Safety thermostat E4 Klixon thermostat with normally closed contact It allows the integrated P C B to feel temperature of flow water in the primary circuit Should the probe malfunction the burner is shut down preventing both central heating and DHW operation The probe is located on the main heat exchanger outlet Flow probe B1 NTC probe 10 kΩ 25 C It enables operation of central h...

Страница 25: ...oing the ignition cycle starts first controlling the ignition electrodes E1 and then both gas valve coils Y1 Burner ignition is detected by the integrated P C B via the ionisation electrode E2 Operating with the Remote Control The Remote Control CAR is enabled when the main switch R10 is in the SUMMER and CAR position If the conditions found by the Remote Control CAR require switching on in the ce...

Страница 26: ...ontact the motor M of the 3 way valve M30 is powered which keeps working until limit switch 1 opens when the d h w position is reached In the meanwhile if the contact of the flue pressure switch S6 is idle NC the adjustment circuit powers the fan M20 by means of relay K3 With the enable of the safety thermostat E4 and consequent switching over of the flue pressure switch to NO S6 the P C B sees to...

Страница 27: ...de When the contact of the room thermostat closes S20 the integrated P C B powers the boiler circulator M1 by means of the K2 relay and by the switching over of the K4 relay contact powers the motor M of the 3 way valve M30 which keeps working until limit switch 1 opens when the central heating position is reached In the meanwhile if the contact of the flue pressure switch S6 is idle NC the adjust...

Страница 28: ...thermostat parameter it is possible to establish that when the set value 8 C is exceeded the contact of the K1 relay opens reclosing as soon as the temperature drops 6 5 C correlated d h w set point Antifreeze request When the temperature measured by the heating flow probe B1 drops below 4 C the P C B enables ignition and keeps the boiler working with the burner at minimum central heating power un...

Страница 29: ...zones control unit function Zones control unit CZ external optional It is a switch with clean contacts closing a circuit low voltage on the integrated P C B enabling central heating operation when ambient temperature is less than desired Room thermostat S20 optional Open Central heating OFF Closed Central heating ON It enables burner ignition by powering K1 relay when flue are properly discharged ...

Страница 30: ...ne see Zone Control Unit function Zone control unit CZ option boiler externally installed Such BUS signal displays boiler temperature DHW or central heating function mode the codes of any activated alarms and the temperature reading of outdoor probe on the remote control display Comando Amico Remoto remote control CAR op tion see CAR function The single pole relay controls the fan M20 and is actua...

Страница 31: ...ill not enable beginning of the ignition cycle Flue pressure switch malfunction S6 Pump M1 and 3 way valve M30 operate for 30 seconds after 24 hours of boiler inactivity when set to SUMMER mode 3 hours of boiler inactivity when set to WINTER mode Pump 3 way valve anti block device When safety thermostat encounters a high resistance contact not perfectly closed or worn out the integrated P C B proc...

Страница 32: ...function is signaled by flashing of no 5 LED and the boiler stops running whether in central heating and DHW mode NTC flow probe B1 malfunction In order to avoid water gas exchanger from overheating at the end of every central hea ting antifreeze or chimneysweep request the pump M1 continues operating for 150 seconds Pump post circulation At the end of any request and after the burner has switched...

Страница 33: ...flashing simultaneously 07 Connection to the Remote Control LED 2 and 3 on fixed Signaled malfunction LED flashing Remote display Remote Control malfunction offline not compatible or RS232 offline LED 2 and 3 flashing alternately CAR E31 CRD 00E No ignition malfunction LED 6 01 Flue pressure switch malfunction LED 8 11 Insufficient circulation LED 4 27 Flow NTC probe malfunction LED 5 05 Overheati...

Страница 34: ...mporarily turning the main selector switch round to RESET until the LED relative to the parameter switches off and then release it When the ok has been given for the selection go to the second level where the value of the parameter selected can be set The value is indicated by the slow flashing of one of the LEDs between 1 to 8 The value is selected by turning the central heating tempera ture knob...

Страница 35: ...ms i e zone systems with mo torised thermostat valves etc it might be necessary to delay ignition Central heating ignitions delayed due to Room thermostat or Remote control requests continuous variation LED flashing slow 0 seconds Standard setting LED 1 54 seconds LED 2 131 seconds LED 3 180 seconds LED 4 206 seconds LED 5 355 seconds LED 6 400 seconds LED 7 510 seconds LED 8 Domestic hot water th...

Страница 36: ...utput Hot water hot water adjustable temperature Hot water circuit flow limiter Hot water circuit min pressure dynamic Hot water circuit max working pressure Min draw of hot water Specific flow rate ΔT 30 C Continuous service capacity ΔT 30 C Loaded boiler weight Empty boiler weight bar C C l bar l kPa m H2 O kW kcal h C l min bar bar l min l min l min kg kg 3 90 35 85 4 5 1 0 2 4 23 7 2 42 24 0 2...

Страница 37: ...working temperature of central heating circuit Central heating temperature range Total volume of system expansion vessel Expansion vessel factory set pressure Appliance water content Available head at 1000 litres hours flow rate Hot water production useful heat output Hot water hot water adjustable temperature Hot water circuit flow limiter Hot water circuit min pressure dynamic Hot water circuit ...

Страница 38: ...45 116 8 1 20 14 97 152 7 13 4 11500 1 58 4 31 43 9 1 17 10 62 108 4 1 16 13 91 141 8 11 0 9500 1 32 3 05 31 1 0 98 7 48 76 3 0 97 9 85 100 4 9 3 8000 1 12 2 20 22 4 0 84 5 30 54 1 0 82 7 00 71 4 NATURAL GAS G20 BUTANE G30 PROPANE G31 Heat output Heat output burner GAS FLOWRATE burner nozzle PRESSURE burner GAS FLOWRATE burner nozzle PRESSURE burner GAS FLOWRATE burner nozzle PRESSURE kW kcal h m3...

Страница 39: ...ol unit kit for zone systems code 3 011668 External probe code 3 014083 Connections set kit only for EOLO Mini 24 Special code 3 015229 Connections set kit only for EOLO Mini 28 Special code 3 016671 Top cover kit code 3 017179 Polyphosphate dispenser kit code 3 016305 Cut off cock kit code 3 4297 Universal connection kit code 3 011667 Antifreeze electric heating element kit 15 C code 3 015348 Add...

Страница 40: ...errupt any domestic hot water requests The pump starts N B LED n 3 must light up at the same time corresponding to the heating request No Check the presence of theTA jumper on clamps 40 41 of the P C B N B the jumper must not be present when external devices are installed such as TA CAR CRD programming clock etc Check the effective request from any external devices TA CAR CRD programming clock See...

Страница 41: ... thermostat b No The boiler reaches and stays at the set heating temperature No Check the maximum heat parameter and adjust it to maximum if necessary See section D Yes The heating request is satisfied The boiler reaches and maintains the set DHW temperature No See section D No Check that the withdrawal of domestic hot water is not greater than that the boiler can distribute see technical data pow...

Страница 42: ...the P C B Over temperature safety thermostat block LED n 7 flashing a The wiring between the safety thermostat and P C B is OK No Restore the electric connection replace the wiring Yes Check replace the safety thermostat If the anomaly should persist replace the P C B b The pump operates correctly N B make sure that the pump operates at maximum speed No See section B Yes Any heating system zone va...

Страница 43: ... replace the wiring Yes Replace the NTC flow probe If the anomaly should persist replace the P C B Parasite flame block LEDs n 1 and 7 flash simultaneously The detection electrode and relative wiring are integral No Check replace the detection electrode Yes Replace the P C B Insufficient circulation LED n 4 flashing The circulation pump functions correctly N B make sure that the pump operates at m...

Страница 44: ...lace 3 way motor valve D At least20 VDC are present on the gas valve modulation coil wires N B carry out the measurement by disconnecting the coil wires see gas circuit chapter No Check wiring and replace the P C B if necessary Yes The gas valve modulation coil has a resistance of 20 25 Ohm SIT 845 N B carry out the measurement by disconnecting the coil wires see gas circuit chapter No Replace the...

Страница 45: ...ter is at least 1 5 l min No Check the correct opening of any cocks cleanliness of pipes filters flow rate limiters etc on the DHW system Yes The flow switch operates correctly No Check clean replace the flow switch Yes The wiring between the flow switch and board is OK No Restore the electric connection replace the wiring Yes Replace the P C B ...

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