Immergas NIKE Mini Export User manual

NIKE Mini Export
Compact wall-hung instantaneous
conventional flue boilers
NIKE Mini Export

Technical documentation Technical documentation
STNME ed 07/03 1 NIKE MINI
NIKE Mini
Conventional flue wall-hung boiler
with instantaneous production of
D.H.W. and compact dimensions
NIKE Mini
- GENERAL FEATURES
NIKE MINI is a wall-hung conventional flue for central heating and the production of domestic hot
water that stands out for its compact dimensions (773 x 450 x 250).
The boiler features a microprocessor-controlled electronic board that electronically controls burner
ignition, central heating and d.h.w. temperature and flame modulation.
The unit has a working heat output of 20.000 kcal/h (23,3 kW) and features a standard antifreeze safety
device that ensures operation with temperatures as low as - 5°C.
The hydraulic circuit features a copper water-gas exchanger, a 3-way hydraulic valve and a
STAINLESS-STEEL plate exchanger for the instantaneous production of domestic hot water.
- MAIN DIMENSIONS AND CONNECTIONS
DIMENSIONS (mm)
HEIGHT WIDTH DEPTH
773 450 250
CONNECTIONS
GAS D.H.W. SYSTEM
G U E R M
1/2 “ 1/2 “ 1/2 “ 3/4 “ 3/4 “
V - power supply
G - gas supply
U – domestic hot water outlet
E – domestic hot water inlet
R - system return
M - system flow

Technical documentation Technical documentation
STNME ed 07/03 2 NIKE MINI
MAIN COMPONENT PARTS
(until serial number 2243650)
1 - Adjustment and limit NTC sensor
2 - 3-way hydraulic valve
3 - Gas valve
4 - System filling valve
5 - Flue safety thermostat
6 - Flue hood
7 - Exchanger overheat safety (115 ºC)
8 - Expansion vessel
9 - Combustion chamber
10- Automatic air vent valve
11- Circulating pump
12- D.h.w. exchanger
13- 3-bar safety valve
14- System drain valve
15- Primary heat exchanger
16- Ignition and detection electrodes
17- Burner
18- Control panel
19- Overheat safety thermostat (100 ºC)

Technical documentation Technical documentation
STNME ed 07/03 3 NIKE MINI
MAIN COMPONENT PARTS
(from serial number 2243651)
1 - 3-way hydraulic valve
2 - Gas valve
3 - System filling valve
4 - Flue safety thermostat
5 - Flue hood
6 - Overheat safety thermostat (105 ºC)
7 - Adjustment and limit NTC sensor
8 - Expansion vessel
9 - Combustion chamber
10- Automatic air vent valve
11- Circulating pump
12- D.h.w. exchanger
13- 3-bar safety valve
14- System drain valve
15- Primary heat exchanger
16- Ignition and detection electrodes
17- Burner
18- Control panel
CONTROL PANEL
1 - Boiler thermo-pressure gauge
2 - Flame presence yellow indicator lamp
3 - Boiler block led indicator lamp
4 - 0/SUMMER/WINTER/RESET switch
5 - D.h.w. temperature selector
6 - Central heating temperature selector
7 - Programmer clock hole plate

Technical documentation Technical documentation
STNME ed 07/03 4 NIKE MINI
HYDRAULIC CIRCUIT
(until serial number 2243650)
(from serial number 2243651)
1 - System filling valve
2 - Hot water flow switch micro.
3 - Gas valve
4 - 3-way hydraulic valve
5 - Adjustment and limit NTC sensor
6 - D.h.w exchanger
7 - Burner
8 - Primary heat exchanger
9 - Stack safety thermostat
10 - Flue hood
11 - Overheat safety thermostat (TS1)
12 - Expansion vessel
13 - Automatic air vent
14 - Circulating pump
15 - Flow limiting device
16 - System drain valve
17 - 3-bar safety valve
18 - Overheat safety thermostat (TS2)
(fitted until serial number 2243650)
G - Gas supply
U - Hot water outlet
E - Hot water inlet
R - System return
M - System delivery
.

Technical documentation Technical documentation
STNME ed 07/03 5 NIKE MINI
The hot water used for central heating and the d.h.w. supply is produced by a primary circuit and a
secondary circuit (domestic hot water), which operate according to need.
PRIMARY CIRCUIT (BOILER CIRCUIT)
The primary circuit with relevant control and safety devices is started every time there is a
central heating, domestic hot water request or antifreeze request.
- OPERATION
The heat contained in the flues produced by combustion is absorbed by the copper blades of the
water-gas exchanger (8) which, in turn, transfers this to the water that circulates inside by means
of the boiler pump (16).
The hot water then directly enters the heating system through the delivery pipe (M) and return
pipe (R).
- CIRCULATOR
This operates on the primary circuit return and
is physically located on the brass return
manifold unit.
It is connected to the monobloc and primary
exchanger by means of pipes with threaded
fittings.
The casing features a threaded fitting onto
which the automatic release valve (1) is
fastened.
- HEAD FLOW GRAPH
The curve representing the system flow and
head ratio depends on the speed of pump
operation.
The curves shown on the graph alongside
refer to:
- A = Circulator at top speed
- B = Circulator at second speed
- C = Circulator at top speed with by-pass
(optional) on
- D = Circulator at second speed with
by-pass (optional) on

Technical documentation Technical documentation
STNME ed 07/03 6 NIKE MINI
- PRIMARY HEAT EXCHANGER
This is a blade type water-gas exchanger consisting of four pipes connected together in series.
This is connected to pump delivery (return) and to primary circuit delivery (delivery) by means
of coupling pipes (3) featuring O.R. seals (5) secured by means of special forks (4).
(until serial number2243650)
At the outlet.(delivery) is the overheating safety
thermostat at 115 ºC (2).
The outlet pipe features the 100 °C safety
thermostat (6) and the NTC delivery sensor (7).
(from serial number 2243651)
At the outlet.(delivery) are the overheating safety
thermostat at 105 ºC (2) and the NTC delivery
sensor (7).
On the outlet pipe is fitted anything.

Technical documentation Technical documentation
STNME ed 07/03 7 NIKE MINI
- SAFETY DEVICES AND CONTROLS
System bypass (1) (optional)
Ensures circulation of water in the primary circuit
(between delivery and return) even when the high
resistance of the system does not permit.
It is fitted between the system delivery and return
connection pipes.
System filling valve
This cock is located between the boiler circuit and
the cold d.h.w. inlet and permits pressurising the
heating system
The housing is obtained in the lower part of the
three-way valve body to which it is screwed up.
(see no. “13” 3-way valve ).
System drain valve (3)
This is a brass cap featuring a hose connector
fitted (screwed) on the bottom part of the return
manifold (2).
By loosening this, the water of the primary circuit
can be externally released.
3-bar safety valve (4)
Prevents safety pressure being exceeded in the
circuit (3 bar).
It is connected in the front part of the manifold (2)
to which it is fitted on the side by a socket screw.
Operation of this valve causes water to run out of
the return pipe.
Automatic air vent (6)
Allows automatic expulsion of any gaseous
substances in the boiler circuit.
It is fitted to the delivery pipe of the pump directly
to the body.
Expansion vessel (7)
This compensates for any changes in volume
caused by water heating and permits restricting
pressure changes.
It 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 manifold (2) by means
of a copper pipe (5) with threaded fittings.

Technical documentation Technical documentation
STNME ed 07/03 8 NIKE MINI
HYDRAULIC CIRCUIT
SECONDARY CIRCUIT (DOMESTIC HOT WATER CIRCUIT)
- OPERATION
A d.h.w. request causes cold water to flow through the 3-way valve (1) and its subsequent movement to
operating position (see hydraulic 3-way valve operation).
This causes the delivery pipe (M) to close with simultaneous opening of the passage towards the d.h.w.
exchanger (2).
This way, circulation is prevented in the heating system, while this does occur in the plate exchanger,
inside which the d.h.w. cold water absorbs the heat contained in the primary circuit water (see d.h.w.
exchanger).
During this stage, the central heating function is disengaged and d.h.w. production has priority.
- DOMESTIC HOT WATER
EXCHANGER
This is a water-water exchanger consisting of 13
stainless-steel plates, one over the other, on the
surface of which the boiler circuit water and d.h.w.
cold water run in counter-current, and by means of
which heat exchange between the two liquids occurs.
It is fitted horizontally and is connected to the 3-way
valve (primary circuit delivery), to the hot water
outlet pipe and to the return pipe of the primary
circuit by means of threaded unions with flat seal
(1).
From serial number 1511772 for NIKE Mini and
from serial number 1507922 for EOLO Mini, the
hydraulic coupling to the 3-way valve (cold water
inlet) is of the coupling type with OR seal (2), while
previously it was obtained by means of a threaded
union with flat seal.