Compact wall-hung instantaneous
conventional ﬂue boilers
S.C HABITAT & SERVICE INSTALATII S.R.L
str. Biharia nr.67-77, sector 1, Bucuresti, ROMANIA
reparatiicentrale.com.ro
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Tel.: 0729 983 578
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NIKE Star Export
NIKE Star Export
Disp.Non-Stop: 0729.983.578
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Technical documentation
Technical documentation
NIKE Star
Conventional flue boiler with
instantaneous production of D.H.W.
and compact dimensions
NIKE Star
- GENERAL FEATURES
NIKE Star is a wall-hung conventional flue boiler for central heating and domestic hot water
production.
The boiler, distinguished by compact dimensions (H=780 mm. W=450 mm. D=250 mm), has a
working potential of 20.000 kcal/h (23.3 kW).
Adjustment and control of the boiler (burner ignition. temperature adjustment. flame modulation.
antifreeze up to – 5 ºC) are entrusted to a microprocessor-controlled electronic board which, by
means of two LEDs, displays boiler operation and performs diagnostics in the event of faults.
The hydraulic circuit features a bithermal type copper water-gas exchanger for the production of
hot water, an automatic system by-pass and a flow meter for tapping the hot water.
- - MAIN DIMENSIONS AND CONNECTIONS
DIMENSIONS (mm)
HEIGHT
WIDTH
DEPTH
780
450
250
CONNECTIONS
GAS
HOT WATER
SYSTEM
G
R
M
U
E
3/4" (*)
3/4 "
3/4 "
1/2 "
1/2 "
(*) the boiler features a 90° gas cock with 3/4" connections
and φ 18 mm welded connector
V - electric connection
G - gas supply
U - hot water outlet
E - cold water inlet
R - system return
M - system flow
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MAIN COMPONENTS
1 - System filler cock
2 - Hot water NTC adjustment probe
3 - Gas valve
4 - D.H.W. flow switch
5 - Combustion chamber
6 - Flue hood
7 - Flue safety thermostat
8 - Heating and limit NTC probe
9 - Overheating safety thermostat.
10- Expansion vessel
11- Automatic air vent
12 - Circulator
13- Absolute water pressure switch
14- Water manifold
15- 3-bar safety valve
16- System drain valve
17- Rapid bithermal exchanger
18- Ignition and detection electrodes
19- Burner
20- Gas cock
21- Control panel
CONTROL PANEL
1 - Boiler heat pressure gauge
2 - Burner operation yellow indicator
3 - Boiler stop red indicator
4 - 0/SUMMER/WINTER/RESET switch
5 - Hot water temperature selector
6 - Central heating temp. selector
7 - Programming clock hole plate
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HYDRAULIC CIRCUIT
1 - Hot water NTC probe
2 - Hot water flow switch
3 - Gas valve
4 - Flow limiting device
5 - System emptying cock
6 - Burner
7 - Rapid bithermal exchanger
8 – Flue hood
9 - Flue safety thermostat
10 - Expansion vessel
11 - Adjustment and limit NTC probe
12 - Overheating safety thermostat
13 – Automatic air vent
14 - Circulator
15 - Absolute water pressure switch
16 - System by-pass
17 - 3-bar safety valve
18 - System filling cock
G - Gas supply
U - Hot water outlet
E - Hot water inlet
R - System return
M - System delivery
The hot water for heating and home use is produced thanks to two separate circuits, selected
according to need.
CENTRAL HEATING CIRCUIT
The central heating circuit, with relevant control and safety devices, is operated every time a
central heating request is made.
- OPERATION
The heat contained in the gases produced by combustion is absorbed by the copper blades of the
water-gas exchanger (7) which, in turn, transfers this to the water circulating inside thanks to the
boiler pump (14).
The hot water is then transferred directly into the central heating system through the supply pipes
(M) and return pipes (R).
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- CIRCULATOR
This operates on the primary circuit return and is located
on the brass header assembly.
It is connected to the enbloc and exchanger by means of
threaded connecting pieces.
The body features a threaded connecting piece to which
is fastened the automatic outlet valve (1).
- PUMP HEAD FLOW GRAPH
The curve that represents the relation between
the flow rate and the available head depends on
the pump operating speed.
The curves shown on the graph alongside refer
to:
- A = Circulator at top speed
- B = Circulator at second speed
- BITHERMAL EXCHANGER
This is a water-gas blade exchanger of the
bithermal type with pipes and fins in
copper for the production of hot water for
central heating and home use.
It consequently works directly in both
circuits to which it is connected by pipes
with threaded connecting pieces (3) with flat
gasket seals (4).
The 6 oval pipes that make it up, inside
which flows the water of the central heating
circuit, contain an equal number of "cross"
pipes involved in direct transit of hot water
for home use (see illustration alongside).
These ducts are hydraulically connected in
parallel in groups of three on the central
heating circuit and in series in the hot water
for home use circuit.
At the exchanger exit is a 100°C
overheating safety thermostat (2) secured on
the side by means of a fork (1).
On the central heating supply pipe is a
housing where (screwed on) the relevant
NTC probe (5) is located.
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- SAFETY DEVICES AND CONTROLS
Automatic system by-pass (4)
This ensures circulation in the central heating
circuit even when this is prevented by the high
resistance of the system.
It operates between the supply and return of the
heating circuit and is accessible after unscrewing
the brass cap (5) on the side of the header (1).
System filling cock (3)
This cock is positioned between the boiler circuit
and the cold water inlet and makes it possible to
pressurise the heating system.
It is housed underneath the brass header (1) to
which it is secured.
System water pressure switch (7)
This is an absolute pressure switch that reads the
pressure inside the central heating circuit.
It is housed in the header (1) and is coupled to a
microswich that prevents boiler operation when the
read pressure is below 0.3 bar.
This way overheating of the bithermal exchanger is
prevented.
System draining cock (see “5” hydraulic circuit)
This is a brass cam featuring a hose connector
fastened (screwed) in the bottom part of the header
(1).
By loosening this, the water of the central heating
circuit can be discharged externally.
3-bar safety valve (2)
This prevents safety pressure being exceeded in the
circuit (3 bar).
This is fastened in the front part of the header (1) to
which it is fitted on the side by means of a sockethead screw.
When this engages, water exits from the return
pipe.
Automatic air vent (8)
For automatically expelling gaseous substances in
the circuit.
Fitted to the supply pipe of the pump, directly on
the pump body.
Expansion vessel (9)
Compensates changes in volume following heating
of water and permits reducing pressure changes.
This is positioned on the right of the boiler
alongside the sealed chamber and has a pre-load
pressure of 0.8 bar and a capacity of 6 l..
It is connected to the return header (1) by means of
a copper pipe (6) with threaded connection pieces.
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HYDRAULIC CIRCUIT
HOT WATER CIRCUIT
- OPERATION
Running the hot water results in transit of cold water inside the flow switch (3) and consequent
closing of the electrical contact coupled to this (see electrical circuit).
As a result, the regulation circuit begins an operating stage with hot-water priority that starts the
burner and, if a central heating request is under way, switches off the boiler pump.
This way, the heat in the fumes produced by combustion is absorbed by the copper blades of the
bithermal exchanger (1) and transferred to the heating circuit water which, in turn, transfers it to the
cold water circuit inside the "cross-shaped" hot-water circuit pipes (2).
- HOT WATER FLOW SWITCH
Whenever hot water is run at a rate of at least 2.5 l/min
and with a dynamic pressure of 0.26 bar, the flow
switch (2) enables the boiler to operate in hot-water
mode.
This is done by means of a magnet which, by lifting
when invested by the cold water flow, moves near to an
electrical contact (reed relay) and causes movement by
means of a magnetic effect.
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The closing of the contact, which is positioned outside the duct through which the water flows,
enables the regulation board to start the hot-water priority operating mode.
This consists of two blocks (one made of brass and one in plastic) which are joined by a clutch and
secured by a pin (3).
At the flow switch exit is an 8l/min flow limiting device (1).
- BITHERMAL EXCHANGER
(See central heating circuit)
Note. : to maintain duration and efficiency of the exchanger, the installation of the "polyphosphate
dosing kit" is recommended in the event of water whose characteristics could cause the formation of
mineral deposits (for instance, this kit is best fitted when the hardness of the water exceeds 25 French
degrees.
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GAS CIRCUIT
The circuit consists of an atmospheric burner and a modulating type valve for gas combustion and gas
flow adjustment respectively.
- OPERATION
When the main coils (3) are supplied, both inner valve shutters open, allowing the gas to flow towards
the burner.
The flow rate/outlet pressure is regulated by means of the gas valve stabiliser and the modulation coil
(1).
By means of the burner nozzles (7), the fuel is injected into the venturi pipes (ramps) inside which the
air-gas mix is obtained that is ignited by the spark from the ignition electrode (5).
- MODULATING GAS VALVE
The gas valve (SIT 845) features two main coils (3) and a modulation coil (1) controlled by the
adjustment board.
The maximum and minimum outlet pressure settings can be made on this valve (see gas adjustments).
Main electrical coils (3)
Two coils of the ON-OFF type are supplied (230V
AC) by the adjustment board when the burner has to
be ignited.
These are electrically connected in parallel and
supplied by mains power through a special connector
(2).
SIT 845
Modulation coil (1)
This is a low-voltage coil controlled by the modulation
board.
This controls the gas valve stabiliser and permits
changing the outlet pressure in a way proportionate to
the DC signal that runs through it.
- BURNER
The burner consists of 12 horizontal venturi pipes (6) in which the gas is injected by an equal number of
nozzles (7) mounted on the special header (8).
Ignition occurs by means of the adjustment board which controls the ignition electrode (5) and detection
electrode (4).
Ignition electrode (5)
This is controlled by the ignition circuit of the
adjustment board which produces an electrical charge
between its end and the burner surface that ignites the
air-gas mix.
This is positioned on the front of the burner in line
with the centre ramp.
Detection electrode (4)
This is controlled by the adjustment board and detects
burner ignition.
It is positioned on the front of the burner on the same
ramp as the ignition electrode.
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GAS ADJUSTMENTS
Max and minimum gas pressure adjustments can be made by means of the gas valve respecting the values
shown on the tables relating to each boiler for the type of corresponding gas.
The features of this appliance are such as to make it possible to differ minimum pressure adjustments
during operation in heating and hot water phases.
The gas valve minimum pressure adjustment does in fact correspond to the minimum pressure in hot
water phase (6,000 kcal/h) while, with regard to heating. the minimum pressure (8,000 kcal/h) can be
adjusted by means of a trimmer positioned on the modulation board (see modulation board adjustments).
- VALVE SIT 845
After connecting a differential pressure
gauge at the exit of gas valve (4) (see
illustration alongside) and removing the
protection cap (6), proceed as follows:
Adjusting maximum pressure
- Draw hot water after setting the
temperature switch at maximum.
Turn nut "3" clockwise to increase
pressure to the burner and anticlockwise to
reduce pressure.
Adjusting min. hot water pressure
(adjustment to be made after regulating
max pressure)
- After interrupting power to the
modulation coil, turn the red screw "2"
clockwise to increase pressure to the
burner and anticlockwise to reduce
pressure.
1) Modulation coil
2) Min power set screw
3) Max pressure adjust. nut
4) Gas valve outlet pressure trap
5) Gas valve inlet pressure trap
6) Protection cap
- CHANGING TYPE OF GAS
Adaptation to a type of gas different to that for which the boiler is set, can be done by using the special kits
(natural gas or LPG).
The changeover consists in replacing the burner nozzles and in moving to the modulation board of the
“NATURAL GAS- LPG” (JP1).
The minimum and maximum pressures of the hot water are then set on the gas valve in the way
described above.
Adjustment of the minimum and maximum power during the central heating phase can be done
afterwards by means of the respective trimmers mounted on the modulation board (see modulation
board operation).
The burner ignition pressure is not adjusted because the type of board operation does not require such
setting (see modulation board operation).
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ELECTRICAL CIRCUIT
E1
E3
IG
LD1
LD2
MOD
- Ignition electrode
- Detection electrode
- Mainr switch
- Burner operation Led
- Signal block Led
- Modulation coil
MP
NM
NS
OP
P1
SP
- Circulator
- NTC heater probe
- NTC hot water probe
- Programmer clock
- Room thermostat jumper
- System water pressure switch
SS
TA
TF
TS
VG
- Hot water flow switch
- Room thermostat
- Flue gas thermostat
- Overheat.safety thermostat
- Gas valve
The electrical circuit of the NIKE STAR boiler is fully controlled by an electronic P.C.B.
Some of the control and safety devices operate at mains voltage and others at low voltage.
230 V AC CIRCUIT
SAFETY DEVICES AND CONTROLS
Detection electrode
(E3)
Fuse
Overheating safety device
(TS)
STNS ed 07/01
This detects ignition of the burmer by whose flame it is invested.
It is connected to the ignition/detection circuit of the adjustment board.
This interrpts power to the circuit when power input is over 2 A.
It is fitted on the modulation board.
Fuse
2 A 250 V
When the safety threshold is exceeded (100 ºC) this interrupts power to Double-contact
the main coils of the gas valve (VG).
thermostat clicson
It is located at the exchanger outlet.
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LOADS
Circulator
(MP)
Gas valve (VG)
(main coils)
This is powered by the adjustment board whenever there is a demand for heating or
antifreeze.
Permits circulation of water in the heating circuit.
This is powered by the ignition circuit of the adjustment board when the burner has to be
ignited.
Permits flow of gas to the burner.
Ignition electrode
(E1)
This is controlled by the ignition circuit of the adjustment board which provokes an electric
spark between its end and the burner surface that ignites the air/gas mix.
Programmer clock
(OP)
(optional)
This clock operates a switch (see low-voltage circuit safety devices and controls) enabling
or disabling boiler operation during heating for the selected time intervals.
This is powered with master switch in position 0. SUMMER and WINTER.
LOW-VOLTAGE CIRCUIT
SAFETY DEVICES and CONTROLS
Absolute water pressure
switch
(SP)
This affects the adjustment board, stopping boiler operation when the
pressure of the boiler circuit falls below 0.3 bar.
Double-contact
switch
C.H. NTC thermistor
(NM)
Permits the P.C.B. to determine the temperature of the water supply of
the heating circuit.
Any breakage will stop burner operation both during heating and hot
water phases.
It is positioned on the heating supply pipe of the exchanger.
10 kohm 25 ºC
D.H.W. NTC thermistor
(NS)
Enables the modulation board to determine hot water outlet temperature.
Its breakage stops burner operation during the hot water phase.
Fitted in the hot water pipe at exchanger outlet.
NTC sensor
Flue safety thermostat
(TF)
Hot water flow switch
(SS)
Located on the fume diverter.
Following an hot water request, this affects the adjustment board so the
boiler starts up during the hot water phase.
When idle this enables operation during the heating phase.
It is located inside the hot water flow switch.
Main switch
STNS ed 07/01
10 kohm 25 ºC
In case of low stack draught, this affects the adjustment board,
Double-contact
preventing boiler operation for 30 minutes.
clicson thermostat
0
(IG)
NTC sensor
Depending on position, permits:
- low voltage circuit not powered
- hot water operation
- hot water and heating operation
RESET
Double-contact
switch
3-position double
switch + reset
button
- resets after the no ignition or high temperature safety device
have been activated (the RESET position operates at mains
voltage, closing a contact that acts on the ignition circuit)
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Programmer clock switch
(OP)
(optional)
Room thermostat (TA)
(external optional)
Technical documentation
Operates on adjustment board, enabling operation of the boiler during
heating at selected times.
If this is mounted singly, connection is made on terminals 6 and 9 of
connector M3 after removing pre-existing jumper P1.
When fitted together with an ambient thermostat (TA) it must be
connected to terminals 6 and 7 of connector M3 after removing the preexisting jumper P1.
Double-contact
switch
By means of the adjustment board, this enables operation of the boiler
during heating when room temperature is below that required.
If fitted singly, connection is made to terminals 6 and 9 of connector M3
after removing the pre-existing jumper P1.
If fitted together with clock (OP) it must be connected to terminals 8 and
9 of connector M3 after removing jumper P1.
Double contact
switch
LOADS
Modulation coil
(MOD)
STNS ed 07/01
This is powered by the modulation board with variable continuous current.
Permits changing gas pressure to burner.
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ELECTRICAL CIRCUIT
CENTRAL HEATING PHASE
When main switch (IG) is in WINTER position, it powers the low-voltage circuit and enables board
operation during heating.
If the water pressure switch (SP) reads a pressure in the heating circuit above minimum value (SP
switch closed), on closing the ambient thermostat contact (TA), the adjustment circuit starts
circulator (MP) and powers the RELAY PUMP.
If the temperature read by the C.H. NTC sensor (NM) is below that set on the control panel by
means of the heating potentiometer, the adjustment circuit starts the REQUEST RELAY.
This way, the board ignition circuit is enabled (IGNITION SECTION) which first of all triggers the
ignition electrode (E1) and then excites the RELAY V/G.
With the consensus of the overheating thermostat (TS), the closing of the contact of RELAY V/G
powers both coils of gas valve (VG).
Burner ignition is detected by the ionisation electrode (E3).
NOTE: Every time the boiler shuts off after reaching the set temperature, the adjustment circuit
stops burner operation in heating phase for 180/30 seconds.
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ELECTRICAL CIRCUIT
HOT-WATER PHASE
Operation
When the main switch (IG) is in SUMMER or WINTER position, this powers the low-voltage
circuit and enables operation in hot water phase.
When the hot water is run, the microswitch contact (SS) of the hot water flow switch closes.
This way, if the water pressure switch (SP) measures a pressure above minimum value in the
heating circuit (SP switch closed), operation in hot water phase is enabled, during which the
circulator (MP) is not started or is switched off in the event of heating request under way.
Subsequently, if the temperature read by the NTC hot water sensor (NS) is below that set on the
control panel by means of the hot water potentiometer, the adjustment circuit starts the REQUEST
RELAY.
This way, the board ignition circuit is enabled (IGNITION SECTION) which first of all triggers the
ignition electrode (E1) and then excites the RELAY V/G.
With the consensus of the overheating thermostat (TS), the closing of the RELAY V/G contact
energises both coils of the gas valve (VG).
Burner ignition is detected by the ionisation electrode (E3).
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MODULATION BOARD
Inside the NIKE STAR control box is a microprocessor controlled electronic board that integrates
ignition and adjustment functions and, by means of LEDs, shows the operating condition of the
appliance, indicating any tripping of safety devices.
- OPERATION
Heating request
When the main switch (IG) is in WINTER position and the system water pressure switch (SP) is closed,
operation is enabled in heating phase.
When the room thermostat contact (TA) closes, the adjustment circuit starts the circulator (MP) by
means of the PUMP RELAY.
If the temperatura read by the Central Heating NTC sensor (NM) is below that set using the heating
potentiometer (RISC), the adjustment circuit excites the REQUEST RELAY.
This way, the board ignition circuit is enabled. This first of all triggers the ignition electrode (E1) and
then, by means of the RELAY V/G, the main coils of gas valve (VG).
During the ignition phase, current to the modulation coil is gradually raised, in 8 seconds, from
minimum to a value equal to about 50% of maximum.
Subsequently, the signal is returned to minimum value for 20 seconds and then increased so as to reach
maximum heating power in 100 seconds.
If during this time, the difference between the temperature set by means of the heating potentiometer
(RISC) and that read by the C.H. NTC sensor (NM) is such as to cause flame modulation, the signal to
the modulation coil is limited and changed according to effective need.
Subsequently, the signal varies in a way directly proportionate to the difference between the temperature
set using the heating potentiometer (RISC) and that read by the NTC sensor (NM).
The modulation range (maximum and minimum) during operation in heating phase is adjusted by
means of the “C.H. MIN POWER” and “C.H. MAX POWER” trimmers.
When the set temperature is exceeded, the REQUEST RELAY contact is opened with consequent
switching off of the burner, the relighting of which for the same request is prevented for a time of 180 s /
30 s
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Hot water request
With the main switch (IG) in SUMMER or WINTER position, when the hot water microswitch (SS) is
closed, operation is enabled in hot water phase during which the circulator (MP) is not started or is
switched off in the event of heating type request under way.
Afterwards, the burner ignites in the same way as the heating phase.
During the ignition phase, the current to the modulation coil is gradually raised in a time of 8 seconds
from minimum to a value equal to about 50% of maximum.
Subsequently, the signal is increased so as to immediately reach (if requested) the maximum value set on
the gas valve.
During operation, flame modulation occurs with reference to the difference between the temperature set
by means of the hot water potentiometer (SANIT) and the temperature read by the hot water sensor
(NS).
Once the set value is exceeded, the burner is kept operating at minimum hot water power (6,000
kcal/h) and the REQUEST RELAY contact is opened (burner off) only when the hot water sensor (NS)
reads a temperature above 65 ºC.
The burner is switched back on when the temperature falls to 64 ºC.
If during operation the C.H. NTC sensor (NM) measures a temperature above 85 ºC, modulation
(reduction of burner power) occurs with reference to the temperature of the heating circuit and, in the
event of this in any case reaching 90°C, the burner is switched off and then back on when the
temperature drops to 80 ºC.
The modulation range (maximum and minimum) during operation in hot water phase is adjusted
on the gas valve (see gas adjustments).
Heating antifreeze request
With the main switch (IG) in SUMMER or WINTER position, when the temperature read by the NTC
sensor (NM) falls below 4 ºC, the board triggers the generator in heating phase with burner at minimum
heating power (adjustment made with POT MIN RISC trimmer on adjustment board) until a boiler
temperature of 42°C is reached
Hot water antifreeze request
With the main switch (IG) in SUMMER or WINTER position, if the temperature read by the hot water
sensor (NS) falls below 4 ºC, the board triggers the generator in heating phase with burner at minimum
heating power (adjustment made with POT MIN RISC trimmer on adjustment board).
The burner is kept operating at minimum heating power until the hot water sensor (NS) reads a
temperature of 8 °C.
During operation, the water in the heating circuit stays at below 42 ºC because, when this temperature is
reached, the board turns off the burner.
“Chimneysweep” request
When the main switch (IG) is moved to “RESET” position for at least 10 seconds, the board ignites the
generator in heating phase and keeps this operating at maximum heating power for 15 minutes.
In this phase, only the limit thermostat function is operative (90 ºC) performed by the C.H. sensor (NM).
The function is only engaged if there are no requests under way for hot water or antifreeze and it is
indicated by means of the fast flashing of red LED LD2.
It can be interrupted by cutting power to the circuit or making a hot water request.
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INPUTS
Absolute water pressure When the pressure in the heating circuit falls below 0.3 bar, it does not
enable operation of the pump (MP) and burner.
switch
When this switch trips, the LEDs LD1 (yellow) and LD2 (red) flash..
(SP)
C.H. NTC thermistor
(NM)
This is as resistance that can be varied in a way inversely proportionate to
the temperature of the supply water in the heating circuit.
Also used as limit thermostat (90 ºC).
Clock programmer
switch (OP)
(optional)
This is a clean contact switch controlled by a clock that enables or
disables boiler operation in heating phase during selected time intervals.
Detection electrode
(E3)
Hot water sensor
(NS)
Flue thermostat (TF)
Hot water signal
(SS)
Main switch
(IG)
open =
no pressure
closed =
pressure OK
Sensor NTC
10 kohm 25 ºC
open = heating
OFF
closed = heating
ON
Enables the ignition circuit of the board to detect the presence of a flame on the burner.
If this does not operate, the no ignition lock trips, signalled by the lighting up of LED LD2
(red).
The eventual operation prior to burner ignition is indicated by the flashing of LED LD2 (red
This is a resistance that can be varied in a way inversely proportionate to
the hot water outlet temperature.
Sensor NTC
10 kohm 25 ºC
In case of low stack draught, this stops the boiler for 30 minutes.
Double-contact
When this engages LEDs LD1 (yellow) and LD2 (red) start flashing clicson thermostat
together.
This indicates the type of request under way (hot water or heating).
Depends on position of hot water flow microswitch (SS).
This is a double switch which, depending on position, either energises or
fails to energise the low-voltage circuit and indicates whether hot water
operation is enabled (SUMMER) or hot water and heating (WINTER).
In RESET position, this releases the ignition circuit in case of tripping of
flame lock or overheating.
open =
no hot water request
closed =
hot water request
Switch A
open= circuit OFF
closed = circuit ON
Switch B
open = SUMMER
closed = WINTER
Overheat. safety device
(TS)
When the safety temperature is exceeded (100 ºC) this interrupts power to
Two-contact
the main coils of the gas valve (VG).
The tripping of this device stops boiler operation (overheating lock) and clicson thermostat
is indicated by the flashing of red LED LD2.
Room thermostat (TA)
(optional)
This is a clean contact switch that enables operation in heating phase open = heating OFF
when the room temperature falls below that required.
closed = heating ON
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OUTPUTS
Ignition electrode
(E1)
This is a high voltage signal (about 16 kV) for energising the ignition electrode on the
boiler.
Modulation coil
(MOD)
This is a positive square-wave signal with variable ON-OFF ratio (duty-cycle) that controls
the modulation coil of the gas valve and makes it possible to alter gas pressure to the
burner.
Programmer clock
(OP)
Permits energising the programmer clock at 230 V AC (optional). This can be fitted on the
boiler dashboard after removing the closing plate.
The signal is operative with master switch in 0 position. SUMMER and WINTER.
PUMP RELAY
This is a single-pole relay for controlling the pump (MP). It is excited when operation is
required.
REQUEST RELAY
V/G RELAY
This is a single-pole relay which is excited when the burner has to be ignited.
By means of its contact, the adjustment board ignition circuit is controlled.
This is a single-pole relay that is excited by the ignition circuit to energise the main gas
valve coils (VG).
ADJUSTMENTS
Anti-leak hot water - post- For engaging or disengaging hot water post-circulation and hot-water
anti-leak (see safety devices and modulation board).
circulation switch
(JP2)
The boiler is supplied with these functions engaged as standard.
Gas switch (JP1)
Gas switch G110
(M14)
Heating potentiometer
(RISC)
Hot water potentiom.
(SANIT)
Heating timer (JP3)
Max heating power
trimmer
(POT. MAX RISC.)
Min heating power
trimmer
off = functions not
engaged
on = functions
engaged
Depending on its position (MET/LPG), it adapts the modulation parameters for the gas for
which the boiler is set (natural gas / LPG).
For adapting the modulation parameters of the board to gas G110
(town gas).
Engaged using the jumper on gas switch JP1 (natural gas/LPG)
which must be shifted onto switch M14
off = natural gas or
LPG
on = G110
(with JP1 off)
For setting the temperature of the water for heating 35 ºC to 80 ºC.
For setting the temperature of the hot water 35 ºC to 55 ºC.
Every time the unit switches off after achieving set temperaturie
during heating phase, a delay of 180 s / 30 s is engaged until the
subsequent ignition for the same request.
off = 30 s
on (standard)=
180 s
For setting max power during heating phase and adapting this to system requirements (from
minimum to maximum regulated on gas valve).
This adjustment should be made about 2 minutes after ignition in heating phase.
For setting min modulated power during heating phase (from minimum to 2/3 maximum).
This adjustment should be made during first 20 s after ignition in heating phase.
(POT. MIN RISC.)
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SAFETY DEVICES
Circulator antilock
With the master switch (IG) in SUMMER or WINTER position, the circulator (MP) is
operated for 30 seconds after 24 hours of inactivity.
Flue safety thermostat
(TF)
In the event of the flue thermostat contact being opened (low stack draught with return of
fumes into the environment) boiler operation is stopped for 30 minutes.
To restart the appliance before timer stop, power will have to be interrupted to the power
circuit by shifting the master switch (IG) to “0” and making a hot water or central heating
request.
The engagement of this safety device is indicated by simultaneous flashing of the LEDs
LD1 (yellow) and LD2 (red).
Hot water anti-leak
To restrict the formation of mineral deposits (limestone) in the event of leaks in the hot
water circuit (taps not closed, hot water circuit leaks, etc.), the temperature of the boiler is
restricted to 57 ºC if the NTC hot water probe (NS) detects a temperature increase during
operation in central heating mode.
When this safety device trips, LED LD2 (red) start flashing quickly.
This function can be disengaged by means of switch JP2 (see modulation board
adjustments).
No ignition lock
If, within 10 seconds from the start of the ignition cycle, the detection electrode (E3) fails to
detect the presence of a flame on the burner, boiler operation is stopped.
To start the appliance again, the master switch (IG) will have to be temporarily returned to
RESET position and a hot water or heating request made.
The tripping of the safety switch is indicated by the lighting up of LED LD2 (red).
No water /no circulation
NTC sensor breakage
(NM and NS)
Overheating lock
(TS)
To prevent the water-gas exchanger from overheating, when the NTC heating sensor (NM)
detects an increase in temperature of over 5 ºC per second (pump stopped, system cocks
closed, etc). the burner is turned off.
The tripping of the safety device is indicated on the control panel by the lighting up of LED
LD2 (red) and the flashing of LED LD1 (yellow).
The breakage of the hot water sensor (NS) prevents operation in hot water phase.
The breakage of the heating sensor (NM) prevents operation in heating and hot water
phases.
The tripping of both safety devices is indicated on the control panel by the flashing of
yellow LED LD1.
In the event of the overheating thermostat contact being opened (temperature of primary
circuit over 105 ºC), boiler operation is stopped.
To start the boiler again, the master switch (IG) must be temporarily moved to RESET
position and a hot water or heating request made.
The tripping of the safety device is indicated by the flashing of LED LD2 (red).
Post- circulation pump in
heating
To prevent the water/gas exchanger from overheating, at the end of each heating request,
the circulator (MP) is kept operating for 30 seconds.
Post- circulation pump in
hot water
To quickly lower the exchanger temperature after a hot water request, the pump is started
for:
- 2.5 seconds if the main switch (IG) is in SUMMER position
- 1.5 seconds if the main switch (IG) is in WINTER position
This function can be disengaged by means of switch JP2 (see modulation board
adjustments).
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INDICATORS
LD1
(yellow led)
LD2
(red led)
off
off
- boiler off (no power)
off
- boiler in stand-by
(request standby)
ON = 1.5 s
OFF = 1.5 s
off
- NTC hot water (NS) or heating (NM) sensor breakage
on
off
- burner operating
off
ON = 1.5 s
OFF = 1.5 s
off
on
flashing
ON = 0.05 s
OFF = 3 s
Depending on their condition, these indicate:
flashing
flashing
- tripping of overheating or presence of parassite flame lock
- tripping of ignition failure lock
flashing at same time
ON = 1.5 s
OFF = 1.5 s
- flue thermostat engaged (gases safety)
flashing
on
ON = 1.5 s
OFF = 1.5 s
flashing alternately
ON = 1.5 s
OFF = 1.5 s
flashing
indifferent
ON = 0.05 s
OFF = 3 s
- no circulation / bad circulation safety device operation
(no water, pump blocked etc.)
- operation of no water pressure switch
(pressure circuit heating not OK)
- presence of leak on hot water circuit
(hot water circuit leak or hot water taps not closed properly)
flashing
indifferent
STNS ed 07/01
ON = 0.1 s
OFF = 0.1 s
- chimney sweep in operation
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NIKE Star OPERATING SEQUENCE
Heating phase
Hot water phase
POWER SUPPLY
POWER SUPPLY
Main switch in WINTER position
Main switch SUMMER or WINTER position
⇓
⇓
POWER TO ADJUSTMENT CIRCUIT
POWER TO ADJUSTMENT CIRCUIT
The closing of main switch contact (WINTER position)
powers the adjustment circuit and enables operation in
heating phase
The closing of main switch contact (SUMMER position)
powers the modulation board and enables operation in hot
water phase
⇓
⇓
CLOSING OF ROOM THERM.
SWITCH
HOT WATER OPERATION REQUEST
Room thermostat request
Hot water demand
⇓
⇓
POWERING PUMP
PUMP SWITCHOFF
With the consensus of the absolute water pressure switch,
the modulation board powers the circulator (MP)
The circulator (MP) is not operated or is turned off if a
heating request is under way
⇓
⇓
POWERING THE IGNITION CIRCUIT
POWERING THE IGNITION CIRCUIT
If the temperature of the heating water is below that set, the
adjustment circuit of the board powers the ignition circuit
If the hot water temperature is below that set, the
adjustment circuit of the board powers the ignition circuit
⇓
⇓
IGNITION ELECTRODE POWER
The ignition circuit of the board powers the ignition electrode
⇓
GAS VALVE COIL POWER
With the consensus of the overheating thermostat (TS), the ignition circuit powers the main
coils of the gas valve.
⇓
BURNER IGNITION (SLOW)
The board sends the slow ignition signal to the modulation coil.
⇓
FLAME DETECTION
By means of the detection electrode, the ignition circuit detects the presence of a flame on
the burner and ends the ignition cycle
⇓
BOILER WORKING
The boiler operates at a power that varies according to the type of request, the
adjustments/settings made and the temperature read by NTC sensors
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NIKE Star TECHNICAL DATA
Nominal heating capacity
kW (kcal/h)
25.6 (22002)
Minimum heating capacity
kW (kcal/h)
11.2 (9195)
Nominal heat output (useful)
kW (kcal/h)
23.3 (20000)
Minimum heat output (useful)
kW (kcal/h)
9.3 (8000)
Useful heating efficiency at nominal output
%
90.9
Useful heating efficiency at 30% nominal output
%
89.2
Loss of heat at shell with burner off / on
%
0.96 / 2.8
Loss of heat at stack with burner off / on
%
0.68 / 6.3
mm
1.30
mbar (mm H2O)
20 (204)
mm
0.77
mbar (mm H2O)
29 (296)
mm
0.77
mbar (mm H2O)
37 (377)
Max operating pressure of heating circuit
bar
3
Max operating pressure of heating circuit
ºC
90
Adjustable heating pressure
ºC
35 - 80
l
6
bar
0.8
l
3.5
Available head capacity 1000 l/h
kPa (m H2O)
23.03 (2.35)
Working thermal power for the production of hot water
kW (Kcal/h)
23.3 (20000)
ºC
35 - 55
l/min
8
Hot water circuit minimum dynamic pressure
bar
0.26
Max hot water circuit operating pressure
bar
10
Diameter of gas nozzle (G20)
Gas pressure (G20)
Diameter of gas nozzle (G30)
Gas pressure (G30)
Diameter of gas nozzle (G31)
Gas pressure (G31)
Total volume of expansion vessel
Expansion vessel preloading
Amount of water in boiler
Adjustable hot water temperature
Flow limiting device
Minimum hot water supply
l/min
2.5
Continuous service supply capacity with ∆T 30ºC
l/min
11.1
Specific capacity with ∆T 30ºC
l/min
10.7
Minimum pressure for flow limiting device rated capacity
bar
1.0
Full boiler weight
kg
34
Empty boiler weight
kg
30
V / Hz
230 / 50
Rated input
A
0.40
Installed power
W
85
Power absorbed by circulator
W
63
-----
IPX4D
Power connection
Appliance electrical system cutout
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COMBUSTION PARAMETERS
(with combustion air temperature 15 ºC )
G20
G30
G31
Rated power fume mass flow
kg/h
66
65
66
Minimum power fume mass flow
kg/h
58
57
59
CO2 at rated power
%
5.47
6.5
6.3
CO2 at minimum power
%
2.5
2.9
2.8
CO at 0% of O2 at rated power
ppm
90
170
48
CO at 0% of O2 at minimum power
ppm
12
19
14
Nox at 0% of O2 at rated power
ppm
116
200
150
Nox at 0% of O2 at minimum power
ppm
65
97
75
Fume temperature at rated power
ºC
94
95
97
Fume temperature at minimum power
ºC
74
75
76
THERMAL POWER ADJUSTMENTS
NATURAL GAS (G20)
Thermal
power
(kW)
Burner gas
flow
(m3/h)
20000
23.3
2.71
10.6
108
2.02
27.5
281
1.99
35.3
360
19000
22.1
2.58
9.7
99
1.93
25.1
256
1.90
32.2
328
18000
20.9
2.45
8.7
88
1.82
22.5
229
1.80
28.9
294
17000
19.8
H
2.31
7.7
79
1.72
20.1
205
1.70
26.8
263
16000
18.6
E
2.18
6.9
70
1.62
17.8
182
1.60
22.9
233
15000
17.4
A
2.05
6.1
62
1.53
15.7
160
1.50
20.2
206
14000
16.3
T
1.92
5.3
54
1.43
13.8
141
1.41
17.7
180
13000
15.1
I
1.79
4.6
47
1.33
12.0
122
1.31
15.3
157
12000
14.0
N
1.66
4.0
40
1.23
10.3
105
1.21
13.2
134
11000
12.8
G
1.52
3.4
34
1.14
8.7
89
1.12
11.2
114
10000
11.6
1.39
2.8
29
1.04
7.3
74
1.02
9.3
95
9000
10.5
1.26
2.3
23
0.94
6.0
61
0.93
7.7
78
8000
9.3
1.13
2.1
21
0.84
4.7
48
0.83
6.4
65
6000
7.0
0.85
1.2
12
0.64
2.7
28
0.63
3.6
37
STNS ed 07/01
Hot
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(mbar) (mm H2O)
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Burner gas
flow
(kg/h)
PROPANE (G31)
Thermal
power
(kcal/h)
C.
Burner nozzle
pressure
BUTANE (G30)
Burner nozzle
pressure
(mbar) (mm H2O)
Burner gas
flow
(kg/h)
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Burner nozzle
flow
(mbar) (mm H2O)
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