Immergas NIKE Mini Export Manuale utente

NIKE Mini Export

Compact wall-hung instantaneous

conventional ﬂue boilers

NIKE Mini Export

Technical documentation Technical documentation

STNME ed 07/03

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

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

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

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

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

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

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

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.

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