Immergas MINI NIKE 3 E User manual

MINI NIKE 3 E
Compact wall-hung
instantaneous conventional
flue boiler
MINI NIKE 3 E
MINI NIKE X 3 E
MINI NIKE X 3 E
Compact wall-hung conventional
flue boiler for central heating only
or with an external storage tank

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MINI NIKE 24 3 E
Small wall-mounted open chamber (type B),
conventional ue instant boiler
MINI NIKE 24 3 E
MINI NIKE 24 3 E is a wall-mounted, open chamber,
conventional ue generator for the heating and production
of domestic hot water.
e appliance is available with eective outputs of 24 kW
(20.640 kcal/h).
Adjustment and control are entrusted to an integrated P.C.B.
with micro processor with continuous ame modulation by
means of 2 sensors (domestic water and central heating).
e new electronics allow the connection of the appliance to
the New Comando Amico Remoto (CAR V2) and allow to
manage and control the boiler at a distance with great ease.
e boiler has a standard anti-freeze safety device that
protects it to a minimum temperature of -5°C (optional to
-15°C).
e hydraulic circuit has a bronze water-gas heat exchanger
and uses a new multi-purpose hydraulic unit made from
composite material (ICHS) which houses the pump and
3-way electric valve that allow the boiler water to circulate in
the CH system or in a STAINLESS steel plate heat exchanger
for the instantaneous production of DHW according to
necessity, as well as the hydraulic circuit control devices
(absolute system pressure switch, adjustable system by-pass, 3-bar
calibrated system safety valve, etc...).
A domestic water ow switch allows the boiler to be activated
when domestic hot water is requested.
General features
e boiler is designed to receive pre-heated water from a solar
storage tank; by activating this function through the boiler
parameters, the burner and the boiler turn on only if necessary
in order to reach the set domestic hot water set point.
e parameters to operate the boiler can be set via the buttons,
where you can view the operating status, mode and anomalies
that have occurred using a digital interface with an easy-to-read
backlit display screen, located in the centre of the dashboard.
e appliance has IPX4D electrical insulation rating: this
means that the boiler is protected against water splashes and
high humidity levels.

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MINI NIKE X 24 3 E
Wall-mounted instantaneous, conventional ue
boiler with open chamber (type B), heating
only and which can be combined with an
external Storage tank unit
MINI NIKE X 24 3 E
MINI NIKE X 24 3 E is a wall-mounted, conventional ue
generator with open chamber for heating purposes. anks
to a special kit (optional), it is designed to be combined with
a separate 80, 105, 120, 200 and 300 litre Storage tank unit.
e appliance is available with eective outputs of 24 kW
(20.640 kcal/h).
e adjustment and the control of the appliance are entrusted
to a microprocessor-integrated P.C.B. with continuous ame
modulation.
e new electronics allow the connection of the appliance to
the New Comando Amico Remoto (CAR V2) and allow to
manage and control the boiler at a distance with great ease.
e boiler has a standard anti-freeze safety device that
protects it to a minimum temperature of -5°C (optional to
-15°C).
e hydraulic circuit has a copper water-gas heat exchanger
and uses a new multi-purpose hydraulic unit made from
composite material (ICHS) which houses the hydraulic circuit
control devices, as well as the pump (absolute system pressure
switch, adjustable system by-pass, 3-bar calibrated system safety
valve, etc.).
e parameters to operate the boiler can be set via the buttons,
where you can view the operating status, mode and anomalies
that have occurred using a digital interface with an easy-to-read
backlit display screen, located in the centre of the dashboard.
General features
e appliance has IPX4D electrical insulation rating: this
means that the boiler is protected against water splashes and
high humidity levels.

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Main MINI NIKE 24 measurements and connections
Main MINI NIKE X 24 measurements and connections
Height
(mm)
Width
(mm)
Depth
(mm)
785 440 240
CONNECTIONS
GAS
DOMESTIC
HOT
WATER
SYSTEM
G AC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Solar valve kit DHW inlet
(Optional)
AF - Domestic cold water inlet
R - System return
M - System ow
V - Electrical connection
N.B.: connection group (optional)
Key:
V - Electrical connection
G - Gas supply
RU - Storage tank unit return (optional)
MU - Storage tank unit ow (optional)
RR - System lling
R - System return
M - System ow
N.B.: connection group (optional)
Height
(mm)
Width
(mm)
Depth
(mm)
785 440 240
CONNECTIONS
GAS DOMESTIC SYSTEM
G RR R M
3/4” 1/2” 3/4” 3/4”

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Key:
1 - Flue hood
2 - System pressure switch
3 - Boiler pump
4 - Domestic hot water ow switch
5 - Gas valve
6 - Domestic hot water probe
7 - System lling valve
8 - Flue safety thermostat
9 - Safety thermostat
10 - Primary heat exchanger
11 - Flow probe
Main MINI NIKE 24 parts
12 - Combustion chamber
13 - Ignition and detection electrodes
14 - System expansion vessel
15 - Burner
16 - Air vent valve
17 - DHW heat exchanger
18 - 3-way valve (motorised)
19 - System draining valve
20 - By-pass
21 - 3 bar safety valve
N.B.: connection group (optional)

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Key:
1 - Flue hood
2 - System pressure switch
3 - Boiler pump
4 - Gas valve
5 - System lling valve
6 - Flue safety thermostat
7 - Safety thermostat
8 - Primary heat exchanger
9 - Flow probe
10 - Combustion chamber
Main MINI NIKE X 24 parts
11 - Ignition and detection electrodes
12 - System expansion vessel
13 - Burner
14 - Air vent valve
16 - 3-way valve (motorised) (optional)
17 - System draining valve
18 - By-pass
19 - 3 bar safety valve
N.B.: connection group (optional)

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Control panel
Key:
1 - Reset Button
2 - Stand-by / O / Summer / Winter button
3 - Key ( ) to increase
the domestic hot water temperature
4 - Button ( ) to reduce
the domestic hot water temperature
5 - Key ( ) to increase the system water
temperature
6 - Key ( ) to reduce the system water
temperature
7 - Boiler manometer
8 - DHW production phase function active
9 - Boiler connected to remote control (optional)
10 - Flame presence symbol and relative output scale
11 - Operation with external temperature probe active
(optional)
12 - Central heating room phase function active
13 - Operation in winter mode
14 - Operation in summer mode
15 - Boiler in Stand-by mode
16 - Temperature and error code display
17 - Boiler in block does not require release via “Reset”
button

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Key:
1 - Domestic hot water ow switch
2 - System lling valve
3 - Flow limiter
4 - Domestic hot water probe
5 - Gas valve
6 - System expansion vessel
7 - Burner
8 - Primary heat exchanger
9 - Flue hood
10 - Flue safety thermostat
11 - Safety thermostat
12 - Flow probe
13 - Air vent valve
14 - Boiler pump
15 - System draining valve
16 - System pressure switch
17 - DHW heat exchanger
18 - 3-way valve (motorised)
19 - By-pass
20 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
R - System return
M - System ow
MINI EOLO 24 hydraulic circuit
e hot water used for central heating and domestic hot water
is produced via a primary and a secondary circuit (DHW)
which are aected according to necessity.

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Key:
1 - System lling valve
2 - Gas valve
3 - System expansion vessel
4 - Burner
5 - Primary heat exchanger
6 - Flue hood
7 - Flue safety thermostat
8 - Safety thermostat
9 - Flow probe
10 - Air vent valve
11 - Boiler pump
12 - System draining valve
13 - System pressure switch
14 - 3-way valve (motorised)
(optional)
15 - By-pass
16 - 3 bar safety valve
G - Gas supply
RR - System lling
R - System return
M - System ow
MINI EOLO X 24 hydraulic circuit
e primary circuit, with relative control and safety devices,
is started every time there is a central heating or anti-freeze
request.

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e primary circuit, with relative control and safety devices,
starts up every time there is a central heating or domestic
hot water request.
Functioning (see MINI NIKE 24)
e heat contained in the ue produced by combustion is
absorbed by the copper blades of the water-air heat exchanger
(8) which, then transfers the heat to the water that circulates
inside by the boiler pump (14).
e water is either sent directly into the system or it can be
deviated inside the STAINLESS steel instantaneous plate heat
exchanger (17).
is depends on the position of the 3-way motorised valve (18),
which allows ow towards the domestic water heat exchanger
(17) in its resting position, or deviates it towards the ow (M)
and return (R) pipes following a request for central heating.
Head ow rate graphics
e progress of the curve that represents the ow rate-head
ratio available to the system depends on the operating speed of
the pump which, according to the position, allows you to set
more or less head on the system. e graph below illustrates
the characteristic curves.
Primary circuit (Boiler Circuit)
A = Head available to the system at maximum speed with by-pass excluded.
B = Head available to the system at maximum speed with by-pass inserted.
C = Head available to the system at second speed with by-pass excluded.
D = Head available to the system at second speed with by-pass inserted.
MINI NIKE 24 - X 24
A
B
Head (m H2O)
Flow rate (l/h)
Head (kPa)
C
D

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Boiler pump (1)
Operates on the primary circuit return. It is part of the pump
body unit made with composite material.
ere is a seat built into the body where the automatic air vent
valve (2) is housed with an O-ring sealing.
To remove the air vent valve from the pump body, turn the
valve counter-clockwise by a quarter turn.
Primary Exchanger (1)
is is a lamellar water-gas heat exchanger with pipes consisting
of 86 copper ns that have the heating ow NTC probe (6)
and the overheating safety thermostat (2) positioned on their
outlet (ow).
e four pipes that it is made of are connected in series (1).
It is connected to the pump ow and to the primary circuit
ow using push-tting pipes (3) with O-ring seal (5) and
locked with clips (4).
1
34
5
2
6
Flow
Return
1
2

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Flow
heat exchanger
Motorised 3-way valve
is is composed of an electric motor (1) connected to the
three-way group (2) with a clip.
Based on the request (DHW or CH), the three-way clip allows
boiler water to enter the heating system or in the DHW (plate)
heat exchanger.
is depends on the position of the shutter (4) which closes
the passage to the system and at the same time opens the
passage to the DHW heat exchanger (DHW position), or vice
versa (CH position).
e motor (1) is operated by the P.C.B. and moves the shutter
(4) in both positions.
e hydraulic part is made of a group built with composite
material (2).
Operation during the heating phase
e counter spring (3) for the shutter (4) is not compressed
(heating position), keeping the passage towards the DHW
(plate) heat exchanger closed and the passage towards the
system ow open.
Both the spring (3) and the shutter (4) are situated inside the
body of the 3-way cartridge made from composite material (2).
Operation in domestic hot water phase
e hydraulic group is kept in the DHW phase position.
e electric motor (1) pushes the stem (5) that the shutter is
attached to (4), closing the passage towards the system, and at
the same time opening the passage towards the DHW (plate)
heat exchanger, compressing the counter spring (3) for the
shutter (4) (DHW position).
Both the spring (3) and the shutter (4) are situated inside the
body of the 3-way cartridge made from composite material (2).
Return
heat exchanger
1
2
5
4
3
Flow
heat exchanger
DHW
Flow
system
FLOW
HEAT EXCHANGER
FLOW
SYSTEM
FLOW
HEAT EXCHANGER
DHW

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Safety devices and controls
Adjustable system by-pass (5)
is guarantees circulation in the CH circuit even when the
high resistance of the system does not allow it.
It operates between the ow and return of the CH circuit.
It is push-tted into the top of the pump group (3) and is
locked with a clip. It is accessible from the front of the pump
group itself and can be adjusted using a screwdriver.
System lling unit (7)
is is a pin valve positioned between the boiler circuit and
the domestic cold water inlet that enables the CH system to
be placed under pressure.
e valve is connected to a manifold (6) which is in turn
connected to the cold water input and the pump group with
a locking clip.
System pressure switch (1)
It detects the pressure inside the primary circuit.
Its seat is built into the pump group (3) and is coupled to a
micro switch that prevents the burner from operating when
the detected pressure is below 0.3 bar.
It prevents the primary heat exchanger from overheating.
Automatic air vent valve (2)
is allows the gaseous substances that may be present in the
boiler circuit to be automatically expelled.
It is mounted on the pump ow directly on the pump group
(3).
3 bar safety valve (4)
is prevents the primary circuit from exceeding the safety
pressure (3 bar).
It is push-tted into the front part of the pump group (3) and
is attached to the external side using a clip.
Its intervention causes water to leak from the boiler return.
Expansion vessel (8)
It compensates the variations in volume caused by heating the
water, thus limiting the pressure variations.
It has a capacity of 6 litres (eectively 4.5 litres) and a factory-
set pressure of 1.0 bar.
It has a rectangular shape and is positioned on the right side
of the boiler next to combustion chamber and is connected
to the pump unit by means of a copper pipe.
8
5
12
3
4
7
6

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FLOW
HEAT EXCHANGER
FLOW
SYSTEM
Motorised 3-way valve (optional) for heating
only systems
is is composed of an electric motor (1) connected to the
three-way group (2) with a clip.
Based on the request (DHW or CH), the three-way valve allows
boiler water to enter the heating system or the DHW exchanger
(Separate 80, 105, 120, 200 and 300 litre storage tank unit).
is depends on the position of the shutter (4) which closes
the passage to the system and at the same time opens the
passage to the DHW heat exchanger (DHW position), or vice
versa (CH position).
e shutter (4) is moved into both positions by powering the
motor (1) (optional) that causes it to move as needed.
e hydraulic part is made of a group built with composite
material (2).
To mount the electric motor (1) push it inside the body of the
three-way valve and block it with the designated clip.
Heating only operation
e counter spring (3) of the shutter (4) is not compressed
(heating position), keeping the passage towards the system
ow open.
Both the spring (3) and the shutter (4) are situated inside the
body of the 3-way cartridge made from composite material (2).
CH and DHW mode (by using the optional motorised
3-way valve)
e operation is conducted in the same way for combined
boilers (see operation in the previous pages).
Flow
Heat exchanger
Return
Heat exchanger
1
2
5
4
3
Flow
system

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Safety devices and controls for "X" versions
(heating only)
Adjustable system by-pass (5)
is guarantees circulation in the CH circuit even when the
high resistance of the system does not allow it.
It operates between the ow and return of the CH circuit.
It is push-tted into the top of the pump group (3) and is
locked with a clip. It is accessible from the front of the pump
group itself and can be adjusted using a screwdriver.
System lling unit (7)
is is a pin valve positioned between the boiler circuit and
the domestic cold water inlet that enables the CH system to
be placed under pressure.
e lling unit is connected to the pump unit (3) via an O-ring
gasket and blocked with the designated clips.
System pressure switch (1)
It detects the pressure inside the primary circuit.
Its seat is built into the pump group (3) and is coupled to a
micro switch that prevents the burner from operating when
the detected pressure is below 0.3 bar.
It prevents the primary heat exchanger from overheating.
Automatic air vent valve (2)
is allows the gaseous substances that may be present in the
boiler circuit to be automatically expelled.
It is mounted on the pump ow directly on the pump group
(3).
3 bar safety valve (4)
is prevents the primary circuit from exceeding the safety
pressure (3 bar).
It is push-tted into the front part of the pump group (3) and
is attached to the external side using a clip.
Its intervention causes water to leak from the boiler return.
System expansion vessel (8)
It compensates the variations in volume caused by heating the
water, thus limiting the pressure variations.
It has a capacity of 6 litres (eectively 4.5 litres) and a factory-
set pressure of 1.0 bar.
It has a rectangular shape and is positioned on the right side
of the boiler next to combustion chamber and is connected
to the pump unit by means of a copper pipe.
5
12
3
4
8
7
3

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Multipurpose Hydraulic Group ICHS
Before replacing the various components found on the ICHS
unit, the water present inside the primary circuit must be
drained by unscrewing the system draining tting.
Before draining, ensure that the system lling valve is closed.
ree-way valve cartridge replacement
To replace the 3-way cartridge (1) slide the locking clip out (2)
and extract the small electric motor (3) and then using a CH
28 key turn the cartridge counter-clockwise so that it detaches
from the composite body (8).
N.B.: when you are re-attaching the cartridge you must be very
careful not to damage the relative O-ring seal.
Pump motor replacement
To replace the pump body, remove the 4 screws (14) that attach
the motor (13) to the composite body (12).
Replacement of the automatic air vent valve.
To remove the air vent valve from the pump body, turn the air
vent valve counter-clockwise by a quarter turn, being careful
not to damage the relative O-ring seal.
N.B.: when re-mounting the air vent valve, pay particular
attention to inserting the relative O-ring correctly.
By-pass cartridge replacement
To replace the by-pass cartridge (5) you need to pull out the
relative locking clip (6), and then pull the cartridge out from
the front.
N.B.: when re-mounting the by-pass cartridge body be careful
not to damage the gasket.
6
14
1
9
8
10
5
4
3
2
12
13
11
7
3 bar safety valve replacement
To replace the 3 bar safety valve (4) you need to pull out the
relative locking clip (6), and then pull the cartridge out from
the front.
N.B.: when re-mounting the 3 bar valve, pay particular
attention to inserting the relative O-ring correctly.
System pressure switch replacement
To replace the system pressure switch (11), slide the relevant
locking clips out.
N.B.: when re-mounting the system pressure switch, pay
particular attention to inserting the relative O-ring correctly.
Taking out the plate heat exchanger
To take out the plate heat exchanger you need to remove the
two screws (7) that keep the plate heat exchanger fastened (9)
to the hydraulic group (8).
N.B.: when you put the plate heat exchanger back in place
you need to pay close attention to inserting it correctly and
checking the state of the gaskets.

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How it operates
Use of the DHW leads to cold water passing through the ow
switch (1) and the consequent closure of the electric contact
that is coupled to it (see electric circuit).
After this, the integrated P.C.B. starts up the phase for DHW
priority that causes the burner to turn on, and if a CH request
is in underway, it also starts up the deviation of the 3 way valve
(2) which subsequently moves to the work position (see how
the 3 way hydraulic valve operates).
is causes the ow pipe (M) to close and simultaneously open
the passage towards the DHW heat exchanger (3).
In this way circulation inside the CH system is prevented,
while it is allowed in the plate heat exchanger, inside which
domestic cold water absorbs the heat contained in the primary
circuit water (see DHW heat exchanger).
e CH phase is excluded in this phase and priority is given
to the production of DHW.
e water/water heat exchange occurs inside the domestic
water heat exchanger (3) which is screwed onto the body of
the domestic water inlet (1) and the body of the domestic
water outlet (2).
e upper left part of the body allows domestic cold water to
enter, while the lower part allows the return of the primary
circuit.
In the same way the upper part right part of the body allows
DHW to ow out and the lower part allows the primary
circuit to ow.
Secondary circuit (Domestic Hot Water Circuit)
1
3
2
4
Domestic cold
water inlet
Flow
primary circuit
Return
primary circuit
Water outlet
DHW
Domestic hot
water outlet
Flow
primary circuit
Return
primary circuit

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1
1
DHW ow switch (2)
With respect to drawing DHW with a ow rate of at least 1.5
l/min and a dynamic pressure of 0.3 bar, the ow switch (1)
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 outside the
pipe where the water passes, allows the integrated modulation
P.C.B. to start the DHW priority function mode.
It is made up from two parts (one in brass and one in plastic)
that are coupled and locked with a pin.
A lter (2) is lodged inside of it.
It is attached with two screws to the body of the DHW inlet
(4), which, in turn, the system lling group is connected to.
A 7.1 l/min ow limiter is inserted at the outlet of the ow
switch (3) (at 2 bar).
DHW heat exchanger
is is a water-water heat exchanger composed of 12 stainless
steel plates laid one on top of the other, where the water from
the boiler circuit and domestic cold water ows over their
surfaces, against the ow, and where the heat exchange occurs
between the two liquids.
e hydraulic coupling is obtained by using four gasket seals
(1) that allow it to be connected directly to the domestic water
inlet body and domestic water outlet body.
Domestic cold
water inlet
Flow
circuit
primary
Return
circuit
primary
Output
water
hot
domestic
water
Inlet
water
cold
domestic
water
1
2
3
4

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e circuit is composed of an atmospheric burner and a
modulating gas valve, which respectively allow the combustion
of the gas and the adjustment of its ow rate.
How it operates
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 (SIT 845)
e gas valve is equipped with two main coils (3) and a
modulation coil (1) controlled by the integrated P.C.B.
The maximum and minimum outlet pressure values are
calibrated 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 by the
mains voltage through a specic connector (2).
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.
Gas circuit
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
Standard values for the boiler at maximum capacity
1
3
2
Modulation
coil
Connector
viewed from the
gas valve
EV1
EV2
Common