Immergas ZEUS kW Export Guida

ZEUS kW

Export

Wall-hung, room sealed boilers

with storage tank

ZEUS kW Export

STZkW ed 10/07 ZEUS kW Export

Technical Documentation Technical Documentation

ZEUS kW Export

Wall hung boiler with storage tank, sealed

chamber and fan assisted ue.

ZEUS 24 kW Export

ZEUS 28 kW Export

General specications.

ZEUS kW is wall-hung boiler with a sealed chamber and a

fan-assisted ue (type C) for central heating and domestic hot

water supply (DHW) with a storage tank.

anks to a special kit (option), the boiler can also be installed

in conguration B22.

It is equipped with a stainless steel storage tank and coil with

an overall 45-litre capacity.

e appliance is available with a useful heat output of 24 kW

(20,640 kcal/h) and 28 kW (24,080 kcal/h) with over 90%

useful eciency rating.

Both versions are equipped with electronic ignition, tempera-

ture and ame modulation control.

anks to new improved electronics, the appliance can be

connected to Comando Amico Remoto remote control, which

allows the boiler to be remotely controlled and managed with

the utmost simplicity.

e hydraulic circuit is equipped with a copper water-gas

exchanger and features a new hydraulic group made out of

composite material. is is where the pump and the electrical

3-way valve are housed (allowing the boiler water to circulate

around the central heating system or the coil in the storage

tank for the production of DHW), as well as the hydraulic

circuit control devices (3-bar safety valve, adjustable system

by-pass, etc.).

e intake of combustion air inside the sealed chamber and the

discharge of ue is assured by a fan controlled by a dierential

ue pressure switch.

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Technical DocumentationTechnical Documentation

Main dimensions and connections.

Key:

G - Gas supply

R - CH return

M - CH ow

RC- DHW re-circulation (option)

AC- DHW ow

AF- Domestic cold water inlet

V - Power supply connection

Height

(mm)

Width

(mm)

Depth

(mm)

890 580 380

CONNECTIONS

GAS SYSTEM DHW

G R M AC AF

1/2” 3/4” 3/4” 1/2” 1/2”

STZkW ed 10/07 ZEUS kW Export

Technical Documentation Technical Documentation

Key:

1 - Burner operating LED

2 - DHW function LED

3 - Central Heating function LED

4 - Temperature LED - Insucient circulation malfunction

5 - Temperature LED - Flow probe malfunction

6 - Temperature LED - No ignition malfunction

7 - Temperature LED - Overheating malfunction

Control panel.

8 - Temperature LED - Flue pressure switch malfunction

9 - DHW Stand-by / Remote control Selector - DHW and

Heating - Reset

10 - DHW temperature selector

11 - Heating temperature selector

12 - Boiler manometer

STZkW ed 10/07 ZEUS kW Export

Technical DocumentationTechnical Documentation

ZEUS kW main components.

Key:

1 - Negative signal pressure point

2 - Positive signal pressure point

3 - Sample points (A air) - (F ue exhaust)

4 - Flue pressure switch

5 - Fan

6 - Primary heat exchanger

7 - Automatic vent valve

8 - Boiler pump

9 - Gas valve

10 - Motorized 3 - way valve

11 - Filling valve

12 - System expansion vessel

13 - DHW probe

14 - Stainless steel storage tank

15 - 3-bar safety valve

16 - draining valve

17 - 8-bar safety valve

18 - Storage tank draining valve

19 - Sealed chamber

20 - Flue hood

21 - Flow probe

22 - Combustion chamber

23 - Safety thermostat

24 - Burner

25 - Ignition and detection electrodes

STZkW ed 10/07 ZEUS kW Export

Technical Documentation Technical Documentation

e hot water used for heating and DHW is produced by a pri-

mary and secondary (DHW) circuit according to demand.

ZEUS kW hydraulic diagram.

18 - Draining valve

19 - Motorized 3 - way valve

20 - DHW probe

21 - 3-bar safety valve

22 - Filling valve

23 - 8-bar safety valve

24 - Cold inlet one - way valve

25 - Storage tank drain valve

G - Gas supply

AC - DHW outlet

AF - Domestic cold water inlet

R - System return

M - System ow

Key:

1 - Gas valve

2 - Stainless steel storage tank coil

3 - Magnesium anode

4 - Stainless steel storage tank

5 - Automatic vent valve

6 - Burner

7 - Combustion chamber

8 - Primary heat exchanger

9 - Flue hood

10 - Fan

11 - Flue pressure switch

12 - Sealed chamber

13 - Flow probe

14 - Safety thermostat

15 - System expansion vessel

16 - Boiler pump

17 - Adjustable by - pass

STZkW ed 10/07 ZEUS kW Export

Technical DocumentationTechnical Documentation

Primary circuit (boiler circuit).

e primary circuit (and its relative control and safety devices)

is enabled every time there is a heating or DHW request.

Operation.

e heat in combustion exhaust is transferred by copper ns

to the water-gas exchanger (8). e water-gas exchanger then

transfers such heat to the water circulating inside it thanks to

the boiler pump (16).

e water is then pushed directly into the system or it can be

diverted to the storage tank coil (2).

is depends on the position of the electric 3-way valve (19)

which, according to the type of request, either allows water to

ow through the central heating ow system (M) and return

(R) pipes or diverts the water towards the coil (2).

Flow rate - head graph.

e shape of the curve representing the ow rate-head ratio

will depend on how the system by-pass is adjusted; thus, the

position of the by-pass will provide more or less head to the

system. e graph below illustrates the characteristic curves

according to the by-pass adjustment.

Boiler pump (1).

e boiler pump operates on the primary circuit return, im-

mediately downstream of the 3-way valve which is connected

to. It is part of the integrated multi-function group made out

of composite material.

e automatic vent valve (2) is also housed in the hydraulic

group casing.

Primary heat exchanger (1).

e primary heat exchanger is a lamellar water-gas heat ex-

changer with copper pipes and ns (No. 77 ns on the 24 kW

boiler exchanger model and 89 ns on the 28 kW version). e

NTC central heating ow probe (2) and the safety thermostat

(3) are positioned on its outlet pipe (ow).

Primary heat exchanger is assembled with four tubes connected

in series (4).

Pipes with threaded ttings connect it to the pump ow and

the primary circuit ow.

Return

A = Head available to the system at third pump speed (screw is tight-

ened 1.5 turns from loose position)

B = Head available to the system at second pump speed (screw is tight-

ened 1.5 turns from loose position)

Head (kPa)

Flow rate in Liter/h

Head (m H2O)

ZEUS 24 kW

Head (kPa)

Flow rate in Liter/h

Head (m H2O)

ZEUS 28 kW

Flow

STZkW ed 10/07 ZEUS kW Export

Technical Documentation Technical Documentation

Motorised 3-way valve.

e electric 3-way valve operates on the primary circuit return

and, according to the type of request (DHW or central heat-

ing), it either directs hot water to central heating system or

storage tank coil.

Such operation depends on the position of the shutter (5),

which either closes the way toward the system opening the way

toward the storage tank (DHW position) or vice-versa (central

heating position).

e shutter (5) can be shifted to either position by powering

the motor (1).

e hydraulic part consists in a group made of composite

material (2) (which includes the pump), driven by a motor (1)

which shifts the valve as necessary.

Operation.

When central heating or DHW position is required, the motor

(1) is switched on by the P.C.B.

Every 180° turn of the motor, shifts the shutter (5) and either

compresses (central heating position) or releases (DHW position)

the shutter opposing spring (4).

Both the spring (4) and the shutter (5) are located inside the

3-way cartridge (3).

When the requested position is reached, it alternatively opens

and closes one of the two limit micro-switches (6) inside the

motor casing (1).

Such procedure makes it possible for disconnection of power

supply to the motor, locking the motor in the position it is in

and enable motor function only when a dierent request is

received (DHW or central heating request).

Storage

tank coil

return

Pump

ow

System

return

PUMP

RETURN

SYSTEM

RETURN

COIL

RETURN

STZkW ed 10/07 ZEUS kW Export

Technical DocumentationTechnical Documentation

Safety and control devices.

Adjustable system by-pass (2).

e adjustable system by-pass guarantees water circulation in

the primary circuit (between ow and return) even when high

resistance in the system would not allow circulation.

By-pass is assembled on the ow manifold group (1) and can be

adjusted by acting on a screw to be accessed from underneath

the valve support plate.

System lling valve group (3).

e system lling valve group consists in a ball valve located

between the boiler circuit and the cold domestic water inlet,

which allows the central heating system to be pressurized.

e cock is connected to a lling tting (4) which is connected

to the 3-way valve group.

Automatic vent valve (6).

e vent valve automatically expels any gaseous substances

from the boiler circuit.

e valve is located on the pump ow pipe directly on the

hydraulic group.

3-bar safety valve (5).

e safety valve ensures 3-bar safety pressure not to be ex-

ceeded.

It is inserted on the front of the ow manifold group (1) and

it is secured by a clip.

When triggered, the safety valve releases water from the ow

pipe.

System expansion vessel (7).

e expansion vessel compensates the variations in volume

caused when water is heated, and therefore it changes in

pressure.

e vessel has a 10-litre capacity (7.7 liter useful capacity) and

a 1.0 bar factory set pressure.

It is located above the storage tank and is connected to the

3-way valve group by a copper pipe.

System ow

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