Immergas EOLO STAR 24 3 E Leitfaden

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentation Technical documentation

NIKE Star 24 3 E

Small wall-mounted open chamber, conventional

ue instant boiler.

NIKE Star 24 3 E

NIKE Star 24 3 E is a wall-mounted, open combustion cham-

ber, conventional ue generator for the heating and production

of domestic hot water.

e boiler distinguishes itself for its extremely small dimensions

H=751 mm, L=440 mm, D=240 mm) and useful heat output

of 23.6 kW (20,296 kcal/h).

Adjustment and control of the appliance (burner ignition,

temperature adjustment, ame modulation and diagnostics), are

entrusted to an electronic P.C.B. with microprocessor that by

means of a digital interface complete with display and buttons,

General features.

allows the visualisation and adjustment of the functioning

parameters.

e hydraulic circuit is equipped with a bithermal water-gas

copper heat exchanger for the production of hot water for

central heating and domestic hot water use, an automatic

by-pass of the system and a ow switch for the cut-o of DW

withdrawal.

e appliance has IPX4D electrical insulation rating: this

means that the boiler is protected against jets of water and

high humidity levels.

Key:

G - Gas supply

AC - Domestic hot water outlet

AF - Domestic cold water inlet

R - System return

M - System ow

V - Power supply connection

Main dimensions and connections.

Height (mm) Width (mm) Depth (mm)

751 440 240

CONNECTIONS

GAS DOMESTIC

HOT WATER SYSTEM

GAC AF R M

3/4” 1/2” 1/2” 3/4” 3/4”

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentationTechnical documentation

Key:

1 - System lling valve

2 - Domestic hot water probe

3 - Gas valve

4 - Domestic hot water ow switch

5 - Combustion chamber

6 - Flue hood

7 - Flue safety thermostat

8 - Safety thermostat

9 - Flow probe

10 - System expansion vessel

Main components.

11 - Air vent valve

12 - System pressure switch

13 - Boiler pump

14 - Manifold

15 - 3 bar safety valve

16 - System draining valve

17 - Rapid heat exchanger

18 - Ignition and detection electrodes

19 - Burner

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentation Technical documentation

Key:

1 - Reset button

2 - Stand-by/summer/winter button

3 - Button (+) to increase

the domestic hot water temperature

4 - Button (-) to reduce

the domestic hot water temperature

5 - Button(+) to increase the system water temperature

6 - Button (-) to reduce the system water temperature

7 - Boiler manometer

8 - Domestic hot water functioning

Control panel.

9 - Temperatures and error code display

10 - Unit of measurement

11 - Central heating functioning

12 - Winter

13 - Summer

14 - Power distributed

15 - Flame presence

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentationTechnical documentation

e central heating circuit, with relative control and safety

devices, is started every time there is a central heating

request.

Operation.

e heat contained in the combustion products is absorbed

by the copper blades of the water-air heat exchanger (7) which

then gives the heat up to the water made to circulate inside

the boiler pump.

e hot water is introduced directly into the central heating

system through ow (M) and return (R) pipes.

Key:

1 - Domestic hot water probe

2 - Domestic hot water ow switch

3 - Gas valve

4 - Flow limiter

5 - System draining valve

6 - Burner

7 - Rapid heat exchanger

8 - Flue hood

9 - Flue safety thermostat

10 - System expansion vessel

11 - Flow probe

12 - Safety thermostat

13 - Air vent valve

14 - Boiler pump

15 - System pressure switch

16 - Automatic by-pass

17 - 3 bar safety valve

18 - System lling valve

G - Gas supply

AC - Domestic hot water outlet

AF - Domestic cold water inlet

R - System return

M - System ow

Hydraulic circuit.

Primary circuit (Boiler Circuit).

e hot water used for central heating and domestic hot

water is produced thanks to two distinct circuits that are

aected according to necessity.

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentation Technical documentation

Boiler pump (1).

Operates on the primary circuit return. It is part of the pump

body unit realised in composite material.

ere is a seat where the automatic air vent valve (2) is housed

with O-ring sealing.

To remove the air vent valve from the pump body, turn the

valve by a quarter turn in an anti-clockwise direction.

Head ow rate graphics.

In central heating mode the generator guarantees available head

to the system depending on the ow rate, which s represented

by the following graphics that show the characteristic curve.

Head (m H2O)

A = Head available to the plant.

Portata (l/h)

Head (kPa)

Primary heat exchanger.

It is a bithermal water-air blade-type heat exchanger with

copper pipes and ns (N° 72 ns) that produce hot water for

central heating and domestic hot water.

It therefore operates directly in both circuits (DHW or CH)

to which it is connected directly by push tting pipes (2) with

O-ring sealing and blocked using relevant clips (3).

e 6 oval pipes of which it is formed and through which

CH circuit water runs, contain just as many "cross-wise"

pipes that are aected by the direct passage of the DHW (see

gure below).

ese pipes are hydraulically connected in parallel three by

three onto the CH circuit and in series in the DHW circuit.

At the heat exchanger outlet (central heating ow) nd the

NTC ow probe (1) and the over-heating safety thermostat

(4).

Domestic

cold water

inlet Domestic

hot water

outlet

Domestic

hot water

outlet

System

ow

Return

system

Heat exchanger pipe section

System central

heating circuit DHW circuit

Flow rate (l/h)

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentationTechnical documentation

Safety devices and controls.

System automatic by-pass (3).

Guarantees circulation in the CH circuit also when the high

resistance of the system does not allow it.

It operates between the ow and the return of the CH circuit

and is inserted inside the by-pass tting (4) that connects the

pump unit (2) to the ow.

System ling unit (7).

It is a cock positioned between the boiler circuit and the dome-

stic cold water inlet that allows to pressurise the CH system.

e lling unit is connected to the DHW ow switch (6) by

a threaded tting and is connected to the pump unit (2) by

O-ring gaskets.

System pressure switch (5).

Detects the pressure inside the primary circuit.

Its seat is on the pump body (2) and is coupled to a micro

switch that prevents functioning of the burner when the pres-

sure detected is below 0.3 bar.

Prevents overheating of the primary heat exchanger.

Automatic air vent valve (1).

Allows the automatic expulsion of the gaseous substances that

may be present in the boiler circuit.

It is mounted on the pump directly on the body (2).

3 bar safety valve (5).

Prevents the safety pressure in the primary circuit from being

exceeded (3 bar).

It is engaged into the front part of the pump body (2) and is

xed using a clip.

Its intervention causes water to escape from the boiler re-

turn.

System expansion vessel (8).

It compensates the volume variation consequent to heating

the water, thus limiting the pressure variations.

It has a capacity of 6 litres (useful 4.2 litres) and a factory/set

pressure of 1.0 bar.

It is positioned on the right side of the boiler at the side of

the sealed chamber and is connected to the pump body (2) by

means of a copper pipe.

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentation Technical documentation

Secondary circuit (Domestic Hot water Circuit).

Operation.

A DHW withdrawal leads to the passage of cold water inside

the ow switch (4) and the consequent closure of the electric

contact coupled to it (see electric circuit).

Following this, the adjustment circuit starts the DHW priority

functioning mode, which leads to burner ignition (3) and,

when a CH request is in progress, switch o of the boiler

pump.

In this way, the heat contained in the combustion products is

absorbed by the copper blades of the bithermal heat exchanger

(2) is given up to the water in the central heating circuit which,

then transmits it to the domestic cold water that ows through

the “cross-wise” DHW pipes (1).

Domestic hot water ow switch.

With respect to a withdrawal of DHW with a ow rate of at

least 1.7 l/min and a dynamic pressure of 0.3 bar, the ow

switch (2) enables the boiler functioning in DHW mode.

is takes place by means of a magnet which, lifting when

it is hit by the ow of domestic cold water, approaches an

electric contact (reed relay) and causes shifting due to the

magnetic eect.

e closure of the contact, which is positioned out of the pipe

where the water passes, allows the integrated P.C.B. to start

the priority DHW functioning mode.

It is made up from two parts (one in brass and one in plastic)

that are coupled and blocked by a pin.

A G1/4" thread is present on the body to which the system

lling unit is connected (3).

A 7.1 l/min ow limiter is inserted at the outlet of the ow

switch (1) (at 2 bar).

Bithermal heat exchanger

(see central heating circuit).

N.B.: to preserve the duration and eciency of the heat exchanger

it is recommended to install the “polyphosphate dispenser” kit in

the presence of water whose characteristics can give rise to scale

deposits (for example, the kit is recommended when water hardness

is higher than 25 French degrees).

Domestic cold

water inlet

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentationTechnical documentation

e circuit is composed of an atmospheric burner and a mo-

dulating gas valve, which respectively allow the combustion

of the gas and the adjustment of its ow rate.

Operating.

e electric power supply of the main coils (3) causes the

opening of both internal shutters of the valve, thus allowing

the passage of gas towards the burner. e outlet ow rate/

pressure is then adjusted by acting on the gas valve stabiliser

by means of the modulation coil (1).

e fuel is injected, by means of the burner nozzles (6), into

the horizontal Venturi pipes (ramps). Here, an optimal air-gas

mixture is obtained that is ignited by the spark of the ignition

electrode (4).

Modulating gas valve (VK 4105 M).

e gas valve is equipped with two main coils (3) and a mo-

dulation coil (1) controlled by the integrated P.C.B.

e maximum and minimum outlet pressure values are cali-

brated on the valve (see gas adjustments).

Main electric coils (3).

ey are two ON-OFF coils that are powered (230 V AC) by

the integrated P.C.B. when burner ignition is necessary.

ey are connected in series and powered at network voltage

rectied by means of a diodes jumper (U1) positioned inside

connector (2) (see wiring diagram).

Gas circuit.

Modulation coil (1).

It is a low voltage coil that is controlled by the integrated

P.C.B.

It acts on the gas valve stabiliser and allows the variation of

the outlet pressure proportionally to the direct current that

passes through it.

Modulating gas valve (SIT 845).

e gas valve is equipped with two main coils (3) and a mo-

dulation coil (1) controlled by the integrated P.C.B.

e maximum and minimum outlet pressure values are cali-

brated on the valve (see gas adjustments).

Main electric coils (3).

ey are two ON-OFF coils that are powered (230 V AC) by

the integrated P.C.B. when burner ignition is necessary.

ey are connected electrically in parallel and powered from

the mains voltage via a relevant connector (2).

Modulation coil (1).

It is a low voltage coil that is controlled by the integrated.

COIL POWER SUPPLY RESISTANCE

EV1 + EV2 230 V AC EV1 = 2,85 kΩ

EV2 = 1,35 kΩ

Modulation coil

(Blue)

250mA DC (G20)

320mA DC (L.P.G.) 28 Ω

Reference values with boiler at maximum power

EV1

EV2 EV1

EV2 =

230V

Connector viewed

from the gas valve

Modulation

Coil







Modulation

Coil

Connector viewed

from the gas valve

EV1

EV2

Common

STNS3E ed 09/08 NIKE Star 24 3 E

Technical documentation Technical documentation

Height to respect:

H min = 2,5 mm

H max = 4 mm

Nominal position on the

third pair of slots

It acts on the gas valve stabiliser and allows the variation of

the outlet pressure proportionally to the direct current that

passes through it.

Burner.

e burner is made up from 11 horizontal Venturi pipes (5)

into which the gas is injected by just as many nozzles (6)

mounted on the relevant collector (7), whose diameter varies

according to the type of gas used (see technical data).

Ignition takes place thanks to an integrated P.C.B. that controls

the ignition and detection electrode (4).

Ignition and detection electrode (4).

In the ignition mode, it is controlled by the integrated P.C.B.

that causes an electric spark between its ends and the surface of

the burner on the contact of which the air-gas mix ignites.

Once the burner is on, it detects ame presence on the burner

allowing the integrated P.C.B. to conclude the ignition cycle

and to vary the gas pressure as required.

It is positioned on the front of the burner in correspondence

with the central ramp.

COIL POWER SUPPLY RESISTANCE

EV1 230 V AC 6,25 kΩ

EV2 230 V AC 860 Ω

Modulation coil 250mA DC (G20)

320mA DC (L.P.G.) 22 Ω

Reference values with boiler at maximum power

Note: for correct ignition and detection of the boiler always

respect the quotes stated in the gure below.

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