EOLO Mini 24-28 Export - Manual Tehnic - Ed 07-07 Centrala Termica [PDF]

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EOLO Mini 24-28 Export

EOLO Mini 24 S Export Compact wall-hung for central heating only boilers with sealed-room

S.C FUTURE LINE INSTAL S.R.L str. Biharia nr.67-77, sector 1, Bucuresti, ROMANIA

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Dispecerat Non Stop Tel. Fix : 021-201.11.14

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EOLO Mini 24-28 Export EOLO Mini 24 S Export

Compact wall-hung instantaneous boilers with sealed-room

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EOLO MINI 24-28 Export

Compact wall-hung instantaneous boiler with sealed-room (type C) fan-assisted.

EOLO Mini 24 EOLO Mini 28

General features. EOLO Mini is a wall-hung, room-sealed, fan-assisted boiler for central heating and producing domestic hot water and is distinguished by its compact size. It is available with an output power of 24 kW (20,640 kcal/h) and 28 kW (24,080 kcal/h). A microprocessor controlled electronic board adjusts and controls the appliance (burner ignition, temperature adjustment, flame modulation and diagnostics) and the operating parameters can be displayed and set by means of a digital interface with display panel and push buttons. With the new electronics the boiler can be connected to the Remote Digital Control for controlling the boiler remotely with the utmost ease and also integrates the timer/room thermostat, boiler diagnostics and delivery temperature thermoregulation functions. The boiler is fitted with a safety antifreeze system as a standard feature that protects it against temperatures as low as -5 °C. The hydraulic circuit is equipped with a copper water-gas exchanger, a pump unit in a composite material and a new electric 3-way valve unit that, according to requirements, allows the boiler water to circulate in the central heating system or in a stainless steel plate exchanger for the instant production of domestic hot water; the primary circuit also features an automatic by-pass and a 3-bar safety valve.

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Combustion air intake inside the sealed chamber and the expulsion of gases are ensured by a fan. A differential pressure switch controls correct fan operation.

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EOLO Mini 24 S Export

Compact wall-hung room-sealed fan-assisted boiler for central heating only (type C).

EOLO Mini 24 S

General features. EOLO Mini S is a wall-hung, room-sealed, fan-assisted boiler for central heating only with an output power of 24 kW (20,640 kcal/h) which, using an optional kit comprising a 3way electric valve and domestic hot water probe and necessary wiring (that can be connected directly to the integrated board), can be combined with a separate storage tank for the production of domestic hot water. A microprocessor controlled electronic board sees to adjusting and controlling the appliance (burner ignition, temperature setting, flame modulation and diagnostics) which, by means of a digital interface complete with display and push buttons, lets you see and adjust the operating parameters. With the new electronics the appliance can be connected to the Remote Digital Control for controlling the boiler remotely with the utmost ease and also integrates the timer/ room thermostat, boiler diagnostics and delivery temperature thermoregulation functions. The boiler is fitted with a safety antifreeze system as a standard feature that protects it against temperatures as low as -5 °C. The hydraulic circuit is equipped with a copper water-gas exchanger, a pump unit in a composite material and a delivery manifold on which an automatic by-pass and safety valve, calibrated at 3 bar, are housed.

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Combustion air intake inside the sealed chamber and the expulsion of fumes are ensured by a fan. A differential pressure switch controls correct fan operation.

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EOLO Mini 24 main dimensions and connections.

Height (mm)

Width (mm)

Depth (mm)

745

450

250

GAS

DOMESTIC WATER

Connections SYSTEM

G

AC

AF

R

M

3/4”

1/2”

1/2”

3/4”

3/4”

Legend: G AC AF R M V -

Gas supply Domestic hot water outlet Cold water inlet System return System delivery Electrical connection

EOLO Mini 28 main dimensions and connections.

Height (mm)

Width (mm)

Depth (mm)

450

310

745

Connections DOMESTIC WATER

GAS G

AC

AF

R

M

3/4”

1/2”

1/2”

3/4”

3/4”

Legend: G AC AF R M V -

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SYSTEM

Gas supply Domestic hot water outlet Cold water inlet System return System delivery Electrical connection

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EOLO Mini 24 S main dimensions and connections.

Height (mm) 745

Width (mm)

Depth (mm)

450

250

Connections GAS

SYSTEM

G

RR

R

M

3/4”

1/2”

3/4”

3/4”

Legend: G RR R M V -

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WATER

Gas supply System filling System return System delivery Electrical connection

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EOLO Mini 24 main components.

Legend: 1 2 3 4 5 6 7 8 9 10 11 12 13 -

Testing holes (A air) - (F flue) Fan D.h.w. flow switch Gas valve Filling valve Boiler pressure gauge Pressure point, positive signal Pressure point, negative signal Flue pressure switch Sealed chamber Delivery probe Overheating safety thermostat System expansion vessel

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14 15 16 17 18 19 20 21 22 23 24 25

-

Combustion chamber Automatic air vent Circulator boiler 3-bar safety valve D.h.w. exchanger 3-way valve (motorised) Automatic by-pass System draining valve Draught diverter Primary exchanger Ignition and detection electrodes Burner

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EOLO Mini 28 main components.

Legend: 1 2 3 4 5 6 7 8 9 10 11 12 13 -

Testing holes (A air) - (F flue) Fan D.h.w. flow switch Gas valve Filling valve Boiler pressure gauge Pressure point, positive signal Pressure point, negative signal Flue pressure switch Sealed chamber Delivery probe Overheating safety thermostat System expansion vessel

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14 15 16 17 18 19 20 21 22 23 24 25

-

Combustion chamber Automatic air vent Circulator boiler 3-bar safety valve D.h.w. exchanger 3-way valve (motorised) Automatic by-pass System draining valve Draught diverter Primary exchanger Ignition and detection electrodes Burner

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EOLO Mini 24 S main components.

Legend: 1 2 3 4 5 6 7 8 9 10 11 12 13 -

Testing holes (A air) - (F flue) Fan Gas valve Filling valve Boiler pressure gauge Pressure point, positive signal Pressure point, negative signal Flue pressure switch Sealed chamber Delivery probe Overheating safety thermostat System expansion vessel Combustion chamber

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14 15 16 17 18 19 20 21 22

-

Automatic air vent Circulator boiler 3-bar safety valve Automatic by-pass System draining valve Draught diverter Primary exchanger Ignition and detection electrodes Burner

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Control panel.

Legend: 1 2 3 4 5 6 7 8 -

Reset push button Stand-by /summer/winter push button (+) push button to increase d.h.w. temperature (-)push button to reduce d.h.w. temperature (+) push button to increase system water temperature (-)push button to reduce system water temperature Boiler pressure gauge D.h.w. functioning mode

9 10 11 12 13 14 15

-

Visual display of temperatures and error codes Unit of measure Central heating functioning mode Winter Summer Power supplied Flame presence

Note for the EOLO Mini 24 S version: Although push buttons (3) and (4), for setting the domestic hot water temperature, and push button (2), (“summer” mode, symbol “13), are present and can be selected, they are not enabled to work.

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EOLO Mini 24 S hydraulic circuit (central heating only).

Legend: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 G RR R M

-

3-bar safety valve Filling valve Gas valve Burner Primary exchanger Draught diverter Fan Sealed chamber Flue pressure switch Delivery probe Safety thermostat System expansion tank Automatic air vent Boiler circulator Automatic by-pass Delivery manifold Draining valve Gas supply System filling System return System delivery

The primary circuit with relevant control and safety devices is triggered each time there is a request for central heating or antifreeze.

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EOLO Mini hydraulic circuit.

Legend: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 G AC AF R M

-

D.h.w. flow switch Flow limiter Filling valve Gas valve Burner Primary exchanger Draught diverter Fan Sealed chamber Flue pressure switch Delivery probe Overheating safety thermostat System expansion vessel Automatic air vent Circulator boiler D.h.w. exchanger 3-way valve (motorised) Automatic by-pass System draining valve 3-bar safety valve Gas supply Domestic hot water outlet Cold water inlet System return System delivery

The hot water for central heating and domestic use is produced by a primary and a secondary (d.h.w.) circuits that work as required.

Primary circuit (Boiler Circuit). The primary circuit, with relevant control and safety devices, is operated each time either a central heating or d.h.w. request is made.

Operation (see EOLO Mini).

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 circulating inside thanks to the boiler circulator (15). The water is transferred directly into the system or can be devi-

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ated to the instant stainless steel plate exchanger (16). This depends on the position of the motorised 3-way diverter valve (17) which, when idle allows the water to flow to the d.h.w. exchanger (16) while if a central heating request is made it deviates the flow to the system’s delivery (M) and return (R) pipes.

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Head flow rate graph.

The course of the curve that represents the flow rate/head ratio available for the system depends on how fast 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.

Head (kPa)

Head (m H2O)

EOLO Mini 24 - 24 S

A B

Flow rate (l/h)

Head (kPa)

Head (m H2O)

EOLO Mini 28

A B

Flow rate (l/h) 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)

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Technical Documentation Boiler circulator (1).

The pump works on the primary circuit return; it is part of the pump body unit made in a composite material. The automatic air vent (2) is housed directly on the body.

2

Technical Documentation Primary exchanger (1).

It is a lamellar water-gas exchanger with copper tubes and fins and at whose outlet (delivery) the central heating NTC delivery 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 delivery and to the primary circuit delivery 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 - 24 S version and 103 in the 28 version) and in the different layout of the delivery and return pipes (see drawing). EOLO Mini 24

1

6

1

2

5

3

4

Delivery

Return

EOLO Mini 28

6

1

2 5 3

4

Return

Delivery

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Motorised 3-way diverter valve for combi models.

It is an electric motor (1) connected to the 3-way unit (2) and locked by a fork that allows, according to the request made (d.h.w. or central heating), boiler water to flow into the central heating system or in the d.h.w. plate exchanger. This depends on the position of the shutter (4) which closes passage to the system while simultaneously opening it to the d.h.w. exchanger (d.h.w. position) or vice versa (central heating position). The motor (1) is made to work by the electronic board and, with each 180° rotation, the shutter (4) moves into both positions. The hydraulic part consists of a brass unit (2).

Exchanger return

Exchanger delivery

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 delivery open. Both the spring (3) and shutter (4) are located inside the 3way brass body (2).

1

Operation in the d.h.w. mode. The standard position of the hydraulic unit is always in the d.h.w. mode. The electric motor (1) pushes the rod (5) to which the shutter (4) is connected which closes passage to the system, simultaneously opening it to the d.h.w. plate exchanger, the shutter’s (4) contrasting spring (3) is compressed (d.h.w. position). Both the spring (3) and shutter (4) are located inside the 3-way valve brass body (2).

D.h.w. exchanger delivery System delivery

5

4

3

EXCHANGER DELIVERY

D.H.W. EXCHANGER DELIVERY

SYSTEM DELIVERY

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Safety devices and checks for combi models. Automatic system by-pass (3). This device guarantees the circulation of water in the central heating circuit even when it would be prevented by the high resistance of the system. It works between the central heating delivery and return, inserted inside the by-pass fitting (4) that connects the pump unit (2) to the 3-way unit.

2

6

System filling unit (7). This is a valve positioned between the boiler circuit and the domestic cold water inlet and makes it possible to pressurise the heating system. This unit is connected to the d.h.w. flow switch (6) by means of a threaded fitting and to the pump unit (2) by means of an O ring.

7

1 Automatic air vent (1). It automatically expels gaseous substances from the boiler circuit. It is mounted on the circulator delivery, 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 return pipe. Expansion vessel (8). It compensates for variations in volume as a result of heating the water which also limits pressure variations. It has a 6-litre capacity (4.5 useful litres) for the 24 model and 7.5 litres (4.5 useful litres) for the 28 model and a preload pressure of 1.0 bar. In the 24 model it is rectangular in shape and located on the right-hand side of the boiler, by the side of the sealed chamber while, in the 28 model it is circular in shape and located at the rear of the boiler, behind the sealed chamber; in both models a copper pipe connects the expansion vessel to the pump unit (2).

2

4

EOLO Mini 28

8

EOLO Mini 24

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3

5

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Safety devices and checks for S models (central heating only). Automatic system by-pass (3). This device guarantees the circulation of water in the central heating circuit even when it would be prevented by the high resistance of the system. It works between the central heating delivery and return, inserted inside the by-pass fitting (4) that connects the pump unit (2) to the delivery manifold.

6

System filling unit (7). This is a valve positioned between the boiler circuit and the domestic cold water inlet and makes it possible to pressurise the heating system. The filling up unit is connected to the cold water inlet coupling (6) by means of a threaded fitting and to the pump unit (2) by means of an O ring.

7

Automatic air vent (1). It automatically expels any gaseous substances there might be in the boiler circuit. It is mounted on the circulator delivery, 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 is fitted at the front of the pump unit (2) and fixed on the outside with a fork. When this valve triggers water exits from the boiler return pipe. Expansion vessel (8). It compensates for variations in volume when the water is heated and also limits pressure variations. It has a 6-litre capacity (4.5 useful litres) for the 24 S model and a preload pressure of 1.0 bar. It is rectangular in shape and located on the right of the boiler, by the side of the sealed chamber and connected to the pump unit (2) with a copper pipe.

2

1

2 3

5 4

EOLO Mini 24 S

8

Note: EOLO Mini 24 S is a wall-hung boiler for central heating only but by using the optional kit consisting of a 3-way electric valve and domestic hot water probe (together with the necessary wiring), it can be combined with a separate storage tank for producing domestic hot water.

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Secondary circuit (domestic hot water circuit) for combi versions only. Operation.

When domestic hot water is drawn cold water flows inside the d.h.w. flow switch (1) which closes the electrical contact coupled to it (see the electrical circuit). As a result, the integrated board starts the d.h.w. priority phase that ignites the burner and, if there’s an ongoing central heating request, switches the 3-way diverter valve (2) moving it into the working position (see operation of the hydraulic 3-way valve). This causes the delivery pipe (M) to close and simultaneously the passage opens to the d.h.w. exchanger (3). In this way circulation in the central heating system is prevented 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. exchanger (3) which is secured to the d.h.w. inlet (1) and outlet (2) body with screws. The top of the body on the left allows cold domestic water to enter, while at the bottom it allows primary circuit return. In the same way, the top part of the body on the right allows the outlet of domestic hot water while at the bottom it allows primary circuit delivery.

Cold water inlet D.h.w. outlet

3 1

Primary circuit return D.h.w. outlet

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Primary circuit delivery

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D.h.w. flow switch (2).

Whenever domestic hot water is drawn at a rate of at least 1.5 l/min and a dynamic pressure of 0.3 bar, the flow switch (2) enables the boiler to work in the d.h.w. mode. This is done by means of a magnet that, lifting when hit by the flow of domestic cold water, moves near to an electrical contact (reed relay) causing it to move thanks to the magnetic effect. When the contact closes, which is located outside the pipe through which the water flows, it enables the adjustment 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.

1 2 3

Cold water inlet

D.h.w. exchanger.

It is a water-water exchanger made of stainless steel plates one on top of the other - 12 (for model 24) and 14 (for model 28) - on whose surface the boiler circuit water and the domestic cold water flow in counter current and through which the heat exchange takes place between the two lots of water. The hydraulic coupling is done using four O rings (1) so it can be connected directly to the d.h.w. inlet body and to the d.h.w. outlet body.

1

Cold water inlet

1 Primary circuit return

D.h.w. outlet

Primary circuit delivery

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Gas circuit. The circuit consists of an atmospheric burner and a modulating gas valve for gas combustion and flow rate regulation respectively.

Operation.

When the main coils (3) are energised both the inner valve shutters open allowing gas to flow through to the burner. The flow rate/outlet pressure is regulated by means of the gas valve stabiliser via the modulation coil (1). By means of the burner (7) nozzles the fuel is injected into the horizontal Venturi tubes (ramps) inside which an optimum air-gas mixture is obtained that is ignited by the spark of the ignition electrode (5).

Modulating gas valve.

Then gas valve (Honeywell VK 4105 o SIT 845) is equipped with two main safety coils (3) and one for modulation (1); they are managed by the printed control board. Maximum and minimum outgoing pressure adjustments are to be performed on the gas valve (see gas pressure adjustment section). Main electric coils (3). The two coils are ON-OFF type, they are powered (230 Volts) by the printed control board when the burner is to be ignited. In SIT 845 valve, they are electrically connected in parallel and powered by the power main tension via a relevant connector (2).

In Honeywell VK 4105 valve, they are connected in series and powered by electric main tension rectified by a diode bridge (U1) located inside the connector (2) (see electric layout). Modulating coil (1). This is a low voltage coil controlled by the integrated board. It controls the gas valve stabiliser and allows the outlet pressure to be varied in a way proportionate to the DC current running through it.

Burner.

The burner consists of horizontal Venturi pipes (6) inside which the gas is injected by the same number of nozzles (7) mounted on the manifold (8). The number of nozzles, whose diameter varies according to the type of gas utilised (see technical data) are 12 (24 version) and 14 (28 version). Ignition occurs thanks to a p.c.b. that controls both the ignition (5) and detection (4) electrodes. Ignition electrode (5). It is controlled by the integrated board that produces an electrical charge between its end and the burner surface, igniting the air-gas mixture when they come into contact. It is located at the front of the burner, by the centre ramp. Detection electrode (4). It is controlled by the integrated board and detects burner ignition. It is located at the front of the burner on the same ramp as the ignition electrode.

1 SIT 845

3

2

1

VK 4105

2

3

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Gas settings. Maximum and minimum pressure settings are done by means of the gas valve, observing the values given in the tables relative to each boiler for the corresponding gas type (see technical data). A differential pressure gauge is used for reading the pressure, its positive pressure point connected to the gas valve (4) outlet and to the positive pressure point on the flange with the holes located at the top of the sealed chamber (see figure).

Gas valve SIT 845.

Setting maximum pressure (EOLO Mini). Draw some domestic hot water after having set its temperature (using the keys on the panel) on maximum. Turn the brass nut (3) clockwise to increase pressure to the burner and counter clockwise to reduce it. Setting maximum pressure (EOLO Mini S). Using the keys on the panel, set central heating temperature on maximum after having set ignition ramp timer on minimum (see integrated board programming) or, if there is an external storage tank, draw some domestic hot water after having set the temperature on maximum (using the keys on the panel). Turn the brass nut (3) clockwise to increase pressure to the burner and counter clockwise to reduce it. Setting minimum pressure (for all models) (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.

SIT 845 valve

Legend: 1 2 3 4 5 6 -

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Coil Minimum output adjustment screw Maximum output adjustment nut Gas valve outlet pressure point Gas valve inlet pressure point Protection cap

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Technical Documentation Gas valve Honeywell VK 4105.

Setting maximum pressure (EOLO Mini). Draw some domestic hot water after having set its temperature (using the keys on the panel) on maximum. Turn the brass nut (3) clockwise to increase pressure to the burner and counter clockwise to reduce it. Setting maximum pressure (EOLO Mini S). Using the keys on the panel, set central heating temperature on maximum after having set ignition ramp timer on minimum (see integrated board programming) or, if there is an external storage tank, draw some domestic hot water after having set the temperature on maximum (using the keys on the panel). Turn the brass nut (3) clockwise to increase pressure to the burner and counter clockwise to reduce it.

Technical Documentation Converting the gas type.

There are special kits for adapting to a type of gas different from the standard one the boilers are intended for (natural gas or LPG). Conversion consists in changing the burner nozzles and modifying the programmable “P1” parameter on the p.c.b. (see integrated board programming). Minimum and maximum d.h.w. pressures are then set on the gas valve in the way described above. Minimum and maximum output in the central heating mode are set via parameters (see integrated board operation). Burner ignition pressure is not to be set because the particular way the board works does not require this type of calibration (see integrated board operation).

Setting minimum pressure (for all models) (to be done after setting maximum pressure). After turning power off to the modulating coil, turn the brass nut (2) clockwise to increase pressure to the burner and in the opposite direction to reduce it.

VK 4105 valve

Legend: 1 2 3 4 5 6 -

Coil Minimum output adjustment nut Maximum output adjustment nut Gas valve outlet pressure point Gas valve inlet pressure point Protection cap

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Flue circuit.

Operation.

The products of combustion, after hitting the water-gas exchanger (1), are conveyed to a hood (2) on top of which the fumes extractor (3) is fitted (fan). Fan operation guarantees the forced expulsion of the fumes and, at the same time, creates a vacuum in the sealed chamber (5) so the combustion air can be aspirated from outside. Correct fume extraction is controlled by a differential flue pressure switch (4); when it triggers it either enables or prevents burner ignition.

Air/fumes testing holes (7-8).

6

7

8

10

3 4

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).

2 11

Flue pressure switch signal pressure points (910).

1

There are two pressure points with screw closing at the top on the outside of the sealed chamber. They measure the signal at the ends of the flue pressure switch (4). The negative pressure point (9) is connected to a Y-shaped pipe (11) which, in turn, is connected to the negative pressure point of the flue pressure switch (4) and to the pressure point on the fan. The positive pressure point (10) is connected directly to the inside of the sealed chamber.

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Flue pressure switch (4).

It is located at the top, inside the sealed chamber and, by means of the relative points, measures the difference in pressure between the fan output (negative signal) and the inside of the sealed chamber itself (positive signal). The signal measured by the pressure switch varies according to the length of the aspiration/exhaust terminals and can be measured by the relative pressure 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 board, enabling or preventing burner ignition. Flue pressure switch triggering pressures

ON OFF Pa (mm H2O) Pa (mm H2O)

EOLO Mini 24-28

52 (5.3)

42 (4.3)

EOLO Mini 24 S

52 (5.3)

42 (4.3)

Fan (3).

The extractor works downstream from the combustion chamber and is secured vertically to the top of the hood (2) from where it extracts the fumes, conveying them to the exhaust pipes to which the boiler is connected. It guarantees the flow of air inside the sealed chamber at the same time. It is controlled by the integrated board and basically its operation coincides with that of the burner.

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Intake and exhaust systems.

(see the intake and exhaust terminals instructions).

The EOLO Mini 24-28-24 S boiler is designed to be connected to the push-fitting intake and exhaust pipes.

Sealed chamber, fan-assisted configuration (type C). Exhaust.

Connection to the fumes exhaust pipes is through a flange (1) or a flanged curve to fix to the fitting (4) at the top of the sealed chamber, placing a shaped 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 according to the type of pipe and its length (see boiler instruction booklet).

5

7 4 1 3

6 2

Intake.

Using the split system, connection to the intake pipes is done in exactly the same way as for the exhaust pipes, connecting to one of the two 80 mm Ø holes (2) at the top of the sealed chamber. The unused hole is closed with one of the plastic caps (3) supplied with the boiler. If coaxial pipes are used, the intake of combustion air is done exploiting the concentric hole, outside the exhaust fitting (5).

Intake and Exhaust Kits.

The kits and their accessories permit use of four concentric systems and two split systems. As regards pressure losses relating to each accessory, the various possible combinations and the use of the diaphragms depending on the length of the pipes used, follow the instructions given for the intake and exhaust terminals (see the boiler instruction booklet). The coupling of the accessories (bends, extensions and terminals) is the fitted type while sealing is guaranteed by silicone lip seals.

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Coupling type horizontal concentric kit Ø 60/100. The exhaust pipe (60 mm Ø) is fitted inside the aspiration pipe (100 mm Ø). Connection to the boiler is done using a 90° bend (2) that can be positioned in any direction and which, by means of the necessary extensions, is connected to the specific aspiration and exhaust terminal (3). The maximum overall permitted length beyond the first bend (2) is 3 straight horizontal metres.

2

3

4

1

5

Coupling type horizontal concentric kit Ø 80/125. The exhaust pipe (80 mm Ø) is fitted inside the aspiration pipe (125 mm Ø). Connection to the boiler is done using a 90° 60/100 Ø bend (2) that can be positioned in any direction and which, by means of the 60/100-80/125 adapter (3) and necessary extensions, is connected to the specific aspiration and exhaust terminal (4). The maximum overall permitted length beyond the first bend (2) is 7.3 straight horizontal metres.

2 1

STEM ed 07/07

3

Coupling type vertical concentric kit Ø 80/125. The exhaust pipe (80 mm Ø) is fitted inside the aspiration pipe (125 mm Ø). Connection to the boiler is done using a flange (2) that, by means of the 60/100-80/125 adapter (3) and necessary extensions, is connected to the specific aspiration and exhaust terminal 80/125 with aluminium tile (6). The maximum overall permitted length is 12.2 straight vertical metres. Coupling type vertical concentric kit Ø 60/100. The exhaust pipe (60 mm Ø) is fitted inside the aspiration pipe (100 mm Ø). Connection to the boiler is done using a flange (2) that, by means of the necessary extensions, is connected to the specific aspiration and exhaust terminal 60 /100 with aluminium tile. The maximum overall permitted length is 4.7 straight vertical metres.

8 7

5

4

3

4

5 6

6

2

1

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80/80 Ø coupling type separator kit. Both pipes are 80 mm in diameter. Connections to the boiler 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 version it is compulsory to install a diaphragm (10) inside the flange (3) and before the aspiration pipe.

9

5

5

6

7

8

10

7

4

3

1

2

80/80 Ø insulated coupling type separator kit. Both pipes are 80 mm in diameter. Connections to the boiler 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. Insulation is by way of the seals (6) which create an air gap with the external concentric 125 mm Ø pipe. The maximum permitted length is 33 straight metres (aspiration + exhaust). To avoid condensate problems, the exhaust pipe is limited to a maximum of 12 metres. NOTE: For the EOLO Mini 28 version it is compulsory to install a diaphragm (12) inside the flange (3) and before the aspiration pipe.

5

8

10

B

12

4 1

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6

11

3

7

8

9

A

2

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Electrical circuit.

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F2 JP1 M1 M20 M30 S2 S3 S4 S6 S20 S21

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Legend: B1 CRD DS1 E1 E2 E4 F1 -

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Delivery probe Remote digital control (optional) Display Ignition electrode Detection electrode Overheating safety thermostat Line fuse

-

X40 Y1 Y2 -

The electrical circuit of the EOLO Mini 24-28-24 S boiler is controlled 100% by a p.c.b. which controls boiler functions. Some of the control and safety devices work at mains voltage (230 Vac) while others at low voltage.

Neutral fuse Boiler type selector Circulator Fan 3-way valve (motorised) Functioning push button Block reset push button D.h.w. flow switch Flue pressure switch Room thermostat (optional) D.h.w. temperature increase push button (if enabled to work) D.h.w. temperature reduction push button (if enabled to work) Central heating temperature increase push button Central heating temperature reduction push button Ignition transformer Boiler board transformer Rectifier located inside the connector of the gas valve (Honeywell gas valve only) Room thermostat jumper Gas valve Gas valve modulator

Nota: The EOLO Mini 24 S is a wall-hung boiler for central heating only which, using an optional kit comprising a 3-way electric valve and a domestic hot water probe together with the necessary wiring (that can be connected directly to the integrated board), can be combined with a separate storage tank to produce domestic hot water.

230 V AC circuit. Control and safety devices. Detection electrode (E2) Line fuse (F1) Neutral fuse (F2)

STEM ed 07/07

It detects burner ignition, being hit by its flame. It is connected to the integrated board. They interrupt power to the circuit when power input is over 3.15 A. They are mounted on the integrated board.

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Ignition electrode (E1)

It is controlled by the integrated board that produces an electrical charge between its end and the burner surface, igniting the air-gas mixture when they come into contact.

Boiler circulator (M1)

It is powered by the integrated board when there’s a d.h.w., central heating or antifreeze request. It permits circulation in the primary circuit.

Integrated board

This board is always powered regardless of the position of the functioning button (S2) (see integrated board operation).

3-way valve (M30) (for combi versions only)

With this valve the flow of primary circuit water can be diverted from the central heating system to the d.h.w. plate exchanger and vice versa. It is powered by the integrated board.

Gas valve (Y1) (main coils)

It is powered by the integrated board when the burner is to be ignited. In SIT 845 gas valve, it is powered by the electric main tension. In VK 4105 gas valve, it is powered by electric main tension rectified by a diode bridge (U1) located inside the connector of the gas valve. It allows gas flow to the burner.

Fan (M20)

It guarantees the flow of air inside the sealed chamber and evacuation of fumes produced by combustion. It is powered by the integrated board.

Low voltage circuit. Control and safety devices.

Remote digital control (CRD) (optional)

This device is used to remotely control the boiler (SUMMER/WINTER selection, setting and indicating temperatures, displaying alarms, resetting, etc.) and acts as a weekly timer/room thermostat. If the CRD is installed the existing X40 jumper has to be removed.

See Remote digital control operation (CRD)

D.h.w. flow switch (S4) (for combi versions only)

After some d.h.w. has been drawn this switch acts on the integrated board provoking operation in the domestic hot water mode. When idle it enables operation in the central heating mode.

Interrupted contact

Flue pressure switch (S6)

It controls the integrated board and enables burner operation when the fumes are evacuated correctly. If it closes with the fan off, the start of the ignition cycle is not enabled.

Changing contact

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Reset push button (S3)

It resets the boiler subsequent to the triggering of the ignition failure safety device, the overtemperature safety device, electromechanical contacts failure or a parasite flame and is used to start the chimneysweep function. If pressed together with the functioning button (S2) it lets you access the boiler parameter settings.

Push button

Functioning button (S2)

The possible functioning selections are: = Circuit powered, the antifreeze and antiblock functions are still active, the various post-circulation and post-ventilation functions are completed. ) = Boiler operation in SUMMER. ( ) = Boiler operation in WINTER. (

Push button

Delivery probe (B1)

It lets the integrated board measure the temperature of the primary circuit delivery water. If it breaks the burner stops working both in the central heating or d.h.w. mode. It is located at the main exchanger outlet.

NTC probe 10 kohm 25°C

Room thermostat (S20) (optional)

It enables operation in the central heating mode when room temperature is below that required. If this room thermostat is installed the X40 jumper must be removed.

Interrupted contact

Overheating safety thermostat (E4)

The burner switches off when the safety temperature (105°C) is exceeded. It is positioned at the main exchanger outlet.

Clicson thermostat with normally closed contact

Loads. Gas valve modulator (Y2)

STEM ed 07/07

It is powered by the integrated board with a variable continuous current. It permits varying of the gas pressure to the burner.

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Electrical circuit. Central heating phase.

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(*) depending on the gas valve used, the main coils are powered at mains voltage (SIT 845) or at mains voltage rectified by a diode bridge (U1) housed in the valve connector (Honeywell VK4105).

of all triggering the ignition electrode (E1) and then both the gas valve coils (Y1). Burner ignition is detected by the integrated board by means of the ionisation electrode (E2).

Working with the Room thermostat.

Remote digital control operation.

By selecting the (Winter) functioning mode with the (S2) push button, the boiler is enabled to work in the central heating mode. When the room thermostat (S20) closes the integrated board powers the boiler circulator (M1) by means of the K3 relay and, with the deviation of the K1 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 adjustment circuit powers the fan (M20) by means of relay K4. The integrated board, enabled by the safety thermostat (E4) and consequent switching of the flue pressure switch over to “NO” (S6) and if the temperature measured by the NTC delivery probe (B1) is below the value set on the boiler’s control panel, energises the request relay K2 that causes the 2 contacts to close which allows the ignition cycle to start, first

STEM ed 07/07

By selecting the Winter functioning mode on the Remote Digital Control (CRD) panel the boiler is enabled to work in the central heating mode. If the conditions detected by the CRD require ignition in the central heating mode, the integrated board powers the boiler circulator (M1) via the K3 relay and the burner is ignited as described above. NOTE: With each switching off when the temperature is reached, the integrated board stops the burner working in the central heating mode for a time equal that set with the board parameters (see integrated board operation).

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Electrical circuit. D.h.w. phase.

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(*) depending on the gas valve used, the main coils are powered at mains voltage (SIT 845) or at mains voltage rectified by a diode bridge (U1) housed in the valve connector (Honeywell VK4105).

Operation.

“NO” (S6), closes the contact of the request relay K2 that causes the 2 contacts to close allowing the ignition cycle to start, first of all triggering the ignition electrode (E1) and then both the gas valve coils (Y1). Burner ignition is detected by the integrated board by means of the ionisation electrode (E2).

By selecting the (Summer ) or (Winter), functioning mode with the (S2) push button, the boiler is enabled to work in the d.h.w. mode. When some domestic hot water is drawn it causes the contact of the d.h.w. flow switch (S4) to close. Subsequently, if the temperature measured by the NTC delivery probe (B1) is below the d.h.w. value set on the boiler’s control panel (or on the CRD if mounted), the integrated board powers the boiler circulator (M1) by means of the K3 relay and, with the deviation of the K1 relay contact, powers the motor (M) of the 3-way valve (M30) which keeps working until limit switch “3” 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 K4. The integrated board, enabled by the safety thermostat (E4) and consequent switching of the flue pressure switch over to

STEM ed 07/07

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Modulation board. �������� ��

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Inside the boiler’s control panel is a p.c.b. that controls the appliance’s electrical devices and sees to the linear modulation of burner power. The appliance’s functioning status is shown on a display, indicating if any of its safety devices have triggered. This board is used on all models, whether they are the conventional or sealed chamber type (NIKE/EOLO Mini 24-28, NIKE/EOLO Mini 24 S). The different boiler functioning modes are recognised automatically by means of the appliance’s wiring. The integrated board is always powered regardless of the operating positioned determined by the functioning knob (S2). The board executes a periodical self-check to make sure it is working properly. During the central heating functioning mode or with the boiler in Stand-by, this function is activated every 18 hours from the last boiler check/powering. During the d.h.w. functioning mode, this self-check starts within 10 minutes from the last time water was drawn and lasts 10 seconds. NOTE: the boiler stops working (together with indications) during the self-check operation.

Operation. Central heating request. By selecting the (Winter),functioning mode with the (S2) push button, the boiler is enabled to work in the central heating mode. When the room thermostat (S20) closes the integrated board powers the boiler circulator (M1) by means of the K3 relay. In the meanwhile, if the contact of the flue pressure switch

STEM ed 07/07

(S6) is idle, “NC”, the adjustment circuit powers the fan (M20) by means of relay K4. The integrated board, enabled by the safety thermostat (E4) and consequent switching of the flue pressure switch over to “NO” (S6), and if the temperature measured by the delivery probe (B1) is below the value set on the boiler’s control panel, energises the request relay K2 that causes the 2 contacts to close which allows the ignition cycle to start. During the first few seconds after the gas valve (Y1) has been powered, the current to the modulating coil (Y2) is limited to the predefined soft ignition current. The burner will then go to the minimum value set by setting the “Minimum Central Heating Power*” parameter and then reach the maximum value set (if required) by setting the “Maximum Central Heating Power*” parameter in a time set in the “Central Heating Ramp Time*” parameter. Subsequently the signal is varied directly proportionate to the difference between the temperature set on the boiler control panel and the temperature measured by the delivery probe (B1). When the set temperature (+5°C) is exceeded, the contact of relay K2 is opened and the burner switched off. Re-ignition time depends on how the “Central Heating Ignitions Timer*” parameter is set. Each time the burner switches off the fan and circulator keep working for another 30 seconds. * see Integrated board programming.

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D.h.w. request.

When some domestic hot water is drawn it causes the contact of the d.h.w. flow switch (S4) to close and enables operation in the d.h.w. mode. Burner ignition then occurs as it does for the central heating phase. During the first few seconds after the gas valve (Y1) has been powered, the current to the modulating coil (Y2) is limited to the predefined soft ignition current. Once the flame is detected, the signal to the modulating coil is increased so as to immediately reach maximum power set on the gas valve (if requested). Flame modulation then occurs with reference to the difference between the delivery temperature chosen as the d.h.w. temperature setting and the temperature measured with the delivery probe (B1). When the reference temperature is reached, the burner is kept working at minimum power and switched off when the limit temperature of 85°C is reached (factory set with fixed set-point). By way of parameter P3 “D.h.w. set-point” it is possible to make the burner switch off (opening of the K2 relay contact) at the set temperature (correlated set-point).

Antifreeze request.

When the temperature measured by the central heating delivery probe (B1) drops below 4°C, the board enables ignition and keeps the boiler working with the burner at minimum central heating power until a boiler temperature of 42°C is reached (radiator antifreeze).

“Chimneysweep” request.

Pressing the “Reset” push button (S3) for at least 10 seconds and releasing it, the board enables boiler ignition and keeps it working at maximum central heating power set for 15 minutes. During this time only the limit thermostat function is observed (90°C) which is carried out by means of the delivery probe (B1). The function is indicated on the boiler display panel by the flashing of the ( and ), symbols; it cannot work if there is an ongoing d.h.w. request. It can be interrupted by cutting power to the circuit, putting (Stand-by), or by either carrying out a d.h.w. the boiler on request or after the 15 minutes.

STEM ed 07/07

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Technical Documentation Inputs.

Remote digital control (CRD) (optional)

It sends the signals to the board relating to the functioning mode (Stand-by/Summer/Winter), temperature adjustments (d.h.w. and central heating) and central heating requests (times, room temperature, etc.).

D.h.w. flow switch (S4) (for combi versions only)

It indicates an ongoing d.h.w. request. After domestic hot water has been drawn it enables boiler operation in the d.h.w. mode which is given priority over the system heating phase.

Closed = d.h.w. request

Flue pressure switch (S6)

It enables burner ignition, powering relay K2 when the fumes are evacuated correctly. If the “NO” contact closes with the fan off, the start of the ignition cycle is not enabled.

Changing contact

Flame detection (E2)

This is a signal that indicates the burner flame has been detected. It allows the board to increase current to the modulating coil (Y2) after having limited it during the ignition phase. It keeps the gas valve open (Y1).

Delivery probe (B1)

It is a resistor that varies in an inversely proportionate way to the temperature of the primary circuit delivery water. It is also used as a limit thermostat (90°C).

NTC probe 10 kohm 25 °C

Room thermostat (S20) (optional)

It is a switch with free contacts that closes a circuit (low voltage) on the integrated board, enabling operation in the central heating phase when room temperature is below that requested.

Open = Heating OFF Closed = Heating ON

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Powering the gas valve (Y1)

It is a 230 V ac signal indicating that the gas valve’s main coils (Y1) are energised.

230 Vac = coils energised 0 Vac = coils not energised

Ignition electrode (E1)

It is a high voltage signal (higher than 16 kV) that determines an electrical discharge at the end of the ignition electrode located on the burner.

Remote digital control (CRD) (optional)

This is a (BUS) signal by means of which boiler temperature, operation in the d.h.w. or central heating mode and triggered alarm codes can be seen on the remote display panel.

Gas valve modulator (Y2)

It is a d.c. signal that controls the modulating coil and the pressure of gas to the burner may be varied according to the output required.

Circulator Relay (K3)

It is a unipolar relay for controlling the circulator (M1) that is excited when its operation is requested.

Request Relay (K2)

3-way valve relay (K1)

Fan relay (K4)

This is a bipolar relay that is excited when the burner has to be ignited. Boiler ignition is enabled by means of its contact. It is a relay by means of which the motor (M) of the electric 3-way valve (M30) is powered. It is excited with a central heating request, it remains idle with a d.h.w. request.

A unipolar relay that controls the fan (M20), excited when fan operation is requested.

Adjustments.

Boiler type selector (JP1)

STEM ed 07/07

Depending on the position of the jumper together with the “Boiler type” parameter setting, the functioning mode of the type of boiler used can be chosen: - position 1-2 = bithermal boiler - position 2-3 = mono-thermal boiler

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Circulator antiblock device / 3-way valve

The circulator (M1) and 3-way valve (M30) are turned on for 30 seconds after: - 24 hours of inactivity with the boiler in the SUMMER ( ) mode. - 3 hours of inactivity with the boiler in the WINTER ( ) mode.

Electromechanical contacts block (safety thermostat and flue pressure switch)

If there is strong resistance of the safety thermostat or flue pressure switch contact (contact not perfectly closed or worn), the integrated board performs a reset and starts a new contact verification cycle; if, after 6 such cycles the problem hasn’t been solved, the boiler is blocked. To get the boiler working again, press the “Reset” button (S3) and then make either a d.h.w. or central heating request.

Parasite flame block

Boiler operation is blocked if there is a dispersion in the detection circuit or a malfunction of the flame control that generates an ionisation current (without the gas valve being open) lasting at least 20 seconds. To get the boiler working again, press the “Reset” button (S3) and then make either a d.h.w. or central heating request.

No ignition block

If, within 10 seconds from the start of the ignition cycle the detection electrode (E2) fails to detect the flame on the burner, boiler operation is blocked. The integrated board makes 2 ignition attempts lasting 10 seconds with an interval of 30 seconds after which it shuts down. To get the boiler working again, press the “Reset” button (S3) and then make either a d.h.w. or central heating request. NOTE: The malfunction can be reset up to 5 consecutive times after which the function is inhibited for at least one hour and you gain one attempt each hour; or you gain 5 attempts (Stand-by) position or cutting power off to the circuit. putting the boiler in the

Flue pressure switch block (S6)

If the flue pressure switch contact opens while the fan is working, the boiler is blocked. If normal conditions are restored the boiler restarts without having to be reset. If it closes with the fan off, the start of the ignition cycle is not enabled.

Safety thermostat block (E4)

If the overtemperature safety thermostat contact opens, boiler operation is blocked. To get the boiler working again, press the “Reset” button (S3) and then make either a d.h.w. or central heating request.

Insufficient circulation

To prevent the water-gas exchanger from overheating in the case of a blocked pump or very little water circulating in the primary circuit, when the central heating NTC delivery probe (B1) detects as increase in the temperature that exceeds 5°C /second, the burner is switched off. It restarts when the delivery temperature drops below 42°C.

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Post-circulation pump

To prevent the water-gas exchanger from overheating, at the end of each central heating, antifreeze or “chimneysweep” request, the circulator (M1) keeps working for 30 seconds.

Sealed chamber post-ventilation

After the burner switches off at the end of any request, the combustion chamber is washed and the fan is kept working for 30 seconds.

NTC probe breakage (B1)

Breakage of the central heating delivery probe (B1) is signalled with the visual display of error code 05 on the boiler display panel and stops operation in both the central heating and d.h.w. mode.

Delivery overtemperature ventilation

To avoid the water-gas exchanger from overheating and if boiler temperature measured by the NTC delivery probe (B1) exceeds 95°C, the fan starts working until the temperature drops below 90°C.

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Digital user interface. The appliance is adjusted and controlled (burner ignition, temperature setting, flame modulation and diagnostics), by a p.c.b. that can be used to display and set operating parameters

by means of a digital interface featuring a display and push buttons.

Operating indicators.

When the appliance is working normally, the illumination of the display is green which, by way of special symbols, indicates boiler status and functioning mode. Operating indicators Boiler powered without a flame

Symbol Display powered

Boiler in the central heating mode

Symbol 11 on

Boiler in the d.h.w. mode

Symbol 8 on

Burner on

Symbol 15 on

Chimneysweep function ongoing

STEM ed 07/07

Symbols 8 and 11 flash simultaneously

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Operating malfunctions indicated.

In the event of a failure or malfunction, the illumination of the EOLO Mini 24-28-24 S display panel changes colour, going from green to orange if the problem can be rearmed electrically or from green to red if the problem can be rearmed manually. The relative error codes, giving the following table, flash simultaneously on the boiler display panel.

Flashing code displayed

Display panel illumination colour

Remote digital display panel

No ignition block

01

Red

01

Safety thermostat overtemperature block

02

Red

02

Electromechanical contacts

04

Red

04

NTC delivery probe malfunction

05

Orange

05

Flue pressure switch failure

11

Orange

11

Parasite flame

20

Red

20

Insufficient circulation

27

Orange

27

CRD offline malfunction or not compatible

31

Orange

31

Operating malfunctions signalled

Control and adjustment push buttons.

The EOLO Mini 24-28-24 S boilers are equipped with push buttons used to select the functioning mode, to set the water temperature in the central heating and d.h.w. modes and to set the boiler’s operating parameters. See the following table for the association of the push buttons: List of Push Buttons

Description

1

Reset push button

2

Stand-by / Summer / Winter push button

3 4 5 6

(+) push button to increase d.h.w. temperature (-) push button to reduce the d.h.w. temperature (+) push button to increase central heating system water temperature (-) push button to reduce central heating system water temperature

Note for the EOLO Mini 24 S version: Although push buttons (3) and (4), for setting the domestic hot water temperature, and push button (2), (“summer” mode, symbol “13), are present and can be selected, they are not enabled to work.

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Programming the integrated board.

The EOLO Mini 24-28-24 S boilers are designed so that some of its operating parameters can be programmed if wanted. By modifying these parameters the boiler can be adapted to meet one’s specific requirements. Proceed as follows to access the programming phase: - press push buttons (1) and (2) simultaneously for about 15 seconds; - with push buttons (3) and (4) select the parameter you intend changing, indicated in the following table: List of parameters

Description

P1

Selecting the type of gas

P2

Selecting special gas G110

P3 P3

D.h.w. set-point, fixed or correlated (for combined boiler version) D.h.w. thermostat (for boilers used for central heating only in the case of combination with a storage tank)

P5

Minimum central heating power

P6

Maximum central heating power

P7

Central heating ignitions waiting time

P8

Central heating ramp ignition time

P9

Type of boiler (mono- or bithermal)

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- modify the corresponding value with push buttons (5) and (6), consulting the following tables; - confirm the value set by pressing the Reset push button (1) for about 5 seconds; - press the d.h.w. temperature setting push buttons (3) + and (4) – simultaneously to cancel the operation. NOTE: if no push buttons are touched for 30 seconds the operation is cancelled automatically. Selecting the type of gas. Setting this function is used to adjust the boiler so it can work with LPG or Natural Gas.

LG (LPG) or nG (Natural Gas) (Standard setting)

NOTE: the EOLO Mini 24-28-24 S boilers are manufactured and calibrated at the nominal output in the central heating phase. But it takes about 10 minutes to reach nominal heating output, modifiable by selecting parameter (P6).

Parameter

NOTE: if the “Minimum central heating power” and “Maximum central heating power” parameters are selected when there is a central heating request, boiler ignition is allowed and powering of the modulator with a current equal to the relative value set.

P1

Minimum central heating power

Selecting the type of gas Range of settable values

Central heating power. The EOLO Mini 24-28-24 S boilers are equipped with electronic modulation that adapts boiler power to the real heat requirements of the home. So the boiler works normally in a variable range of gas pressures ranging from the minimum to the maximum central heating power according to the system’s thermal load.

Gas G110 - China gas. Setting this function is used to adjust the boiler so it can work with the first family gases.

Range of settable values

Parameter

from 0 % = (Imin. standard setting) to 63 % Imax

P5

Gas G110 - Gas China (first family gas) Range of settable values

Parameter

on - oF (Standard setting)

P2

Fixed or correlated d.h.w. set-point (for combi versions only). By setting the P3 parameter on the on mode, burner switching off is correlated to the d.h.w. temperature setting. In the oF mode the burner switches off at the maximum value. Fixed or correlated d.h.w. set-point Range of settable values on correlated - oF fixed (Standard setting)

Parameter P3

D.h.w. thermostat (for boilers used for central heating only in the case of combination with a storage tank). By setting parameter P3 on the oF mode, boiler ignition for heating domestic water occurs when the temperature of the water inside the tank drops 3°C compared to the temperature set. In the on mode, boiler ignition for heating domestic water occurs when the temperature of the water inside the storage tank drops 11°C compared to the temperature set. NOTE: whatever mode is selected the boiler always switches off at a set point value. Domestic hot water thermostat Range of settable values on - boiler ignition at -11°C oF - boiler ignition at -3°C (standard setting)

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Maximum central heating power Range of settable values

Parameter

from I Pot. min. heating set (= Imin.) to 99 % Imax. (Standard setting)

P6

Waiting time. The boiler has an electronic timer that prevents too frequent burner ignitions in the central heating mode. The boiler has its own standard timer set at 3 minutes. Central heating ignitions timer Range of settable values

Parameter

from 1 to 10 3 = 3 minutes (Standard setting) 1 = 30 seconds

P7

Central heating ignition ramp timer. The boiler carries out an approximate 10 minute ignition ramp to go from minimum power to nominal central heating power. Central heating ramp timer Range of settable values from 1 to 10 10 = 10 minutes (Standard setting) 1 = 30 seconds

Parameter P8

Parameter P3

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Boiler type. By selecting this parameter you can choose the mode for the type of boiler in use: instant single-heating boiler (0), dual-heating boiler (1) or single-heating boiler with storage tank (2) (in the case of combining EOLO Mini 24 S with a separate storage tank). NOTE: depending on the selection made, also move the JP1 jumper on the p.c.b.: position 1-2 for the bithermal boiler or position 2-3 for the mono-thermal boiler. Attention: the boiler is factory set so only use this function if the electronic board is replaced. Boiler type Range of settable values from 0 to 2 0 = mono-thermal boiler (instantaneous) 1 = bithermal boiler 2 = mono-thermal boiler (with storage tank)

STEM ed 07/07

Parameter P9

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EOLO Mini 24-28 operating sequence. Central Heating mode

D.h.w. mode

Power on Boiler functioning knob on Winter

Power on Boiler functioning knob on Summer or Winter

Ú

Ú

Enabling integrated board operation The functioning knob (Winter position) enables boiler operation in the central heating mode

Enabling integrated board operation The functioning knob (Summer or Winter position) enables boiler operation in the d.h.w. mode

Ú

Ú

Closing of the Room thermostat/ CRD operation request Either the room thermostat or the CRD (if installed) detects the conditions that require operation in the central heating mode

Closing the d.h.w. flow switch Drawing domestic hot water

Ú

Ú

Powering the circulator and 3-way valve The integrated board powers the boiler circulator and the electric 3-way valve, the valve is moved into the central heating position

Powering the circulator and 3-way valve The integrated board powers the boiler circulator and the electric 3-way valve, the valve is moved into the d.h.w. position

Ú

Ú

Controlling the flue pressure switch contacts The integrated boards verifies the correct position of the flue pressure switch (normally closed contact NC)

Ú Powering the fan The integrated board powers the fan

Ú Controlling the flue pressure switch contacts The integrated board verifies deviation of the flue pressure switch contact as a consequence of the fan working (normally open contact NO)

Ú Powering the ignition electrode The integrated board powers the ignition electrode

Ú Powering the gas valve coils With the enable of the overtemperature safety thermostat the integrated board powers the gas valve coils

Ú Burner ignition (automatic soft ignition) The integrated board sends the soft ignition current to the modulating coil

Ú Flame detection By means of the detection electrode the integrated board detects burner ignition

Ú Boiler working The burner works at a power that varies according to the type of request, to the adjustments/settings made and to the temperatures detected by the NTC delivery probe

STEM ed 07/07

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Technical Documentation

Technical Documentation

Technical data. EOLO Mini 24 technical data. Nominal heat input Minimum heat input Nominal heat output (useful) Minimum heat output (useful) Efficiency at 100% Efficiency at 30% of load Outer casing losses with burner On/Off Stack losses with burner On/Off Gas nozzle diameter Supply pressure Max. central heating circuit pressure Maximum heating temperature C.H. temperature adjustment C.H. total expansion vessel volume C.H. expansion vessel preload pressure Appliance water content Available head with 1000 l/h flow rate D.H.W. useful thermal power D.H.W. temperature adjustment D.H.W. flow limiter Min. pressure for nominal flow rate Minimum dynamic pressure d.h.w. circuit Max. d.h.w. circuit pressure Minimum flow rate for d.h.w. Flow rate for continuous service (∆T 30°C) Specific flow rate (∆T 30°C) Boiler weight full Boiler weight empty Electrical connection Nominal power draw Electric power installed Circulator power draw Fan power draw Electrical insulation degree Fumes flow rate at max heat output Fumes flow rate at min heat output CO2 at Q. Nom./Min. CO at 0% of O2 at Q. Nom./Min. NOX at 0% of O2 at Q. Nom./Min. Exhaust flue temperature at max heat output Exhaust flue temperature at min heat output NOX class NOX weighted CO weighted Type of appliance Category

STEM ed 07/07

kW (kcal/h) kW (kcal/h) kW (kcal/h) kW (kcal/h) % % % % mm mbar (mm H2O)

25.8 (22146) 10.6 (9122) 24.0 (20640) 9.3 (8000) 93.2 90.3 0.4 / 0.6 6.4 / 0.06 G20

G30

G31

1.30 20 (204)

0.77 29 (296)

0.77 37 (377)

bar °C °C l bar l kPa (m H2O) kW (kcal/h) °C l/min bar bar bar l/min l/min l/min kg kg

3 90 38 - 85 4.5 1.0 2,4 17.6 (1.79) 24.0 (20640) 30 - 60 7.1 1.2 0.3 10 ≤ 2.0 10.7 11.4 36.4 34

V/Hz A W W W -

230/50 0.65 115 63 36 IPX5D

kg/h kg/h % ppm ppm °C °C

G20

G30

G31

55 57 6.7 / 2.5 84 / 70 101 / 59 111 86

55 56 7.7 / 3.0 95 / 70 116 / 59 112 88

57 57 7.4 / 2.9 54 / 62 130 / 61 109 87

mg/kWh mg/kWh

3 113 55

C12 / C32 / C42 / C52 / C62 / C82 II2H3+

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EOLO Mini 28 technical data. Nominal heat input Minimum heat input Nominal heat output (useful) Minimum heat output (useful) Efficiency at 100% Efficiency at 30% of load Outer casing losses with burner On/Off Stack losses with burner On/Off Gas nozzle diameter Supply pressure Max. central heating circuit pressure Maximum heating temperature C.H. temperature adjustment C.H. total expansion vessel volume C.H. expansion vessel preload pressure Appliance water content Available head with 1000 l/h flow rate D.H.W. useful thermal power D.H.W. temperature adjustment D.H.W. flow limiter Min. pressure for nominal flow rate Minimum dynamic pressure d.h.w. circuit Max. d.h.w. circuit pressure Minimum flow rate for d.h.w. Flow rate for continuous service (∆T 30°C) Specific flow rate (∆T 30°C) Boiler weight full Boiler weight empty Electrical connection Nominal power draw Electric power installed Circulator power draw Fan power draw Electrical insulation degree Fumes flow rate at max heat output Fumes flow rate at min heat output CO2 at Q. Nom./Min. CO at 0% of O2 at Q. Nom./Min. NOX at 0% of O2 at Q. Nom./Min. Exhaust flue temperature at max heat output Exhaust flue temperature at min heat output NOX class NOX weighted CO weighted Type of appliance Category

kW (kcal/h) kW (kcal/h) kW (kcal/h) kW (kcal/h) % % % % mm mbar (mm H2O)

30.0 (25782) 12.0 (10356) 28.0 (24080) 10.5 (9030) 93.4 90.7 0.5 / 0.57 6.1 / 0.08 G20

G30

G31

1.30 20 (204)

0.77 29 (296)

0.77 37 (377)

bar °C °C l bar l kPa (m H2O) kW (kcal/h) °C l/min bar bar bar l/min l/min l/min kg kg

3 90 38 - 85 4.5 1.0 2,6 22.55 (2.3) 28.0 (24080) 30 - 60 9.2 1.5 0.3 10 ≤ 2.0 12.8 13.4 36.6 34

V/Hz A W W W -

230/50 0.77 135 79 45 IPX5D

kg/h kg/h % ppm ppm °C °C

G20

G30

G31

63 66 6.8 / 2.45 82 / 84 110 / 90 107 87

64 67 7.8 / 2.8 108 / 90 162 / 91 108 86

65 67 7.5 / 2.8 52 / 70 153 / 105 106 87

mg/kWh mg/kWh

2 151 56

C12 / C32 / C42 / C52 / C62 / C82 II2H3+

- The flue temperature values refer to an air inlet temperature of 15°C. - Data relative to d.h.w. performance refer to a dynamic inlet pressure of 2 bar and an inlet temperature of 15°C; these values are measured at boiler outlet considering that to find these declared values mixing with cold water is necessary.

STEM ed 07/07

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EOLO Mini 24 S technical data. Nominal heat input Minimum heat input Nominal heat output (useful) Minimum heat output (useful) Efficiency at 100% Efficiency at 30% of load Outer casing losses with burner On/Off Stack losses with burner On/Off Gas nozzle diameter Supply pressure Max. central heating circuit pressure Maximum heating temperature C.H. temperature adjustment C.H. total expansion vessel volume C.H. expansion vessel preload pressure Appliance water content Available head with 1000 l/h flow rate Domestic hot water adjustable temperature (only in case of combining with hot water storage tank) Boiler weight full Boiler weight empty Electrical connection Nominal power draw Electric power installed Circulator power draw Fan power draw Electrical insulation degree Fumes flow rate at max heat output Fumes flow rate at min heat output CO2 at Q. Nom./Min. CO at 0% of O2 at Q. Nom./Min. NOX at 0% of O2 at Q. Nom./Min. Exhaust flue temperature at max heat output Exhaust flue temperature at min heat output NOX class NOX weighted CO weighted Type of appliance Category

STEM ed 07/07

kW (kcal/h) kW (kcal/h) kW (kcal/h) kW (kcal/h) % % % % mm mbar (mm H2O)

25.8 (22146) 10.6 (9122) 24.0 (20640) 9.3 (8000) 93.2 90.3 0.4 / 0.6 6.4 / 0.06 G20

G30

G31

1.30 20 (204)

0.77 29 (296)

0.77 37 (377)

bar °C °C l bar l kPa (m H2O)

3 90 38 - 85 4.5 1.0 2 17.6 (1.79)

°C kg kg

20 - 60 36.4 34

V/Hz A W W W -

230/50 0.65 115 63 36 IPX5D

kg/h kg/h % ppm ppm °C °C

G20

G30

G31

55 57 6.7 / 2.5 84 / 70 101 / 59 111 86

55 56 7.7 / 3.0 95 / 70 116 / 59 112 88

57 57 7.4 / 2.9 54 / 62 130 / 61 109 87

mg/kWh mg/kWh

3 113 55

C12 /C32 / C42 / C52 / C62 / C82 II2H3+

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EOLO Mini 24 - 24 S variable heat output. METHANE (G20)

BUTANE (G30)

INJECTOR PRESSURE BURNER

GAS FLOWRATE BURNER

PROPANE (G31)

HEAT OUTPUT

HEAT OUTPUT

GAS FLOWRATE BURNER

INJECTOR PRESSURE BURNER

GAS FLOWRATE BURNER

INJECTOR PRESSURE BURNER

(kW)

(kcal/h)

(m3/h)

(mbar)

(mm H2O)

(kg/h)

(mbar)

(mm H2O)

(kg/h)

(mbar)

(mm H2O)

24,0

20640

2,73

12,10

123,4

2,03

28,50

290,7

2,00

36,60

373,3

22,6

19410

2,57

10,73

109,4

1,92

25,45

259,6

1,89

32,76

334,1

19,8

17000

2,27

8,30

84,7

1,69

19,97

203,7

1,67

25,84

263,6

19,2

16500

2,21

7,84

80,0

1,65

18,92

193,0

1,62

24,51

250,0

18,6

16000

2,15

7,40

75,4

1,60

17,89

182,5

1,58

23,21

236,7

18,0

15500

2,09

6,96

71,0

1,55

16,90

172,3

1,53

21,94

223,8

17,4

15000

2,02

6,54

66,8

1,51

15,93

162,5

1,48

20,71

211,2

16,9

14500

1,96

6,14

62,6

1,46

14,99

152,8

1,44

19,51

199,0

16,3

14000

1,90

5,75

58,7

1,41

14,07

143,5

1,39

18,34

187,1

15,7

13500

1,83

5,37

54,8

1,37

13,19

134,5

1,35

17,21

175,5

15,1

13000

1,77

5,01

51,1

1,32

12,33

125,7

1,30

16,11

164,3

14,5

12500

1,71

4,67

47,6

1,27

11,50

117,3

1,25

15,04

153,5

14,0

12000

1,64

4,33

44,2

1,22

10,69

109,1

1,21

14,01

142,9

13,4

11500

1,58

4,01

40,9

1,18

9,92

101,2

1,16

13,02

132,8

11,0

9500

1,32

2,89

29,4

0,98

7,11

72,5

0,97

9,37

95,6

9,3

8000

1,12

2,20

22,4

0,84

5,30

54,1

0,82

7,00

71,4

EOLO Mini 28 variable heat output. METHANE (G20)

BUTANE (G30)

PROPANE (G31)

HEAT OUTPUT

HEAT OUTPUT

GAS FLOWRATE BURNER

(kW)

(kcal/h)

(m3/h)

(mbar)

(mm H2O)

(kg/h)

(mbar)

(mm H2O)

(kg/h)

(mbar)

(mm H2O)

28,0

24080

3,17

11,80

120,4

2,36

27,70

282,5

2,33

35,60

363,1

26,7

23000

3,03

11,10

113,2

2,26

26,07

265,9

2,22

33,60

342,7

26,1

22410

2,95

10,72

109,3

2,20

25,18

256,8

2,17

32,51

331,6

24,4

21000

2,77

9,81

100,1

2,07

23,07

235,4

2,03

29,89

304,9

23,3

20000

2,65

9,17

93,5

1,97

21,59

220,2

1,94

28,03

285,9

22,1

19000

2,52

8,53

87,0

1,88

20,10

205,0

1,85

26,17

266,9

20,9

18000

2,39

7,88

80,4

1,78

18,62

189,9

1,76

24,29

247,8

19,8

17000

2,27

7,24

73,9

1,69

17,13

174,8

1,67

22,41

228,5

18,6

16000

2,15

6,59

67,2

1,60

15,64

159,6

1,57

20,50

209,1

17,4

15000

2,02

5,94

60,6

1,51

14,14

144,3

1,48

18,58

189,5

16,3

14000

1,90

5,28

53,9

1,41

12,64

128,9

1,39

16,63

169,6

15,1

13000

1,77

4,62

47,1

1,32

11,11

113,4

1,30

14,65

149,5

14,0

12000

1,65

3,94

40,2

1,23

9,57

97,7

1,21

12,65

129,5

12,8

11000

1,52

3,26

33,3

1,14

8,02

81,8

1,12

10,60

108,1

11,6

10000

1,40

2,57

26,2

1,04

6,43

65,6

1,03

8,52

86,9

10,5

9030

1,27

1,88

19,2

0,95

4,87

49,7

0,94

6,45

65,8

STEM ed 07/07

INJECTOR PRESSURE BURNER

GAS FLOWRATE BURNER

INJECTOR PRESSURE BURNER

GAS FLOWRATE BURNER

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