Immergas ZEUS Maior Manuale utente

ZEUS

Maior @

Wall-hung, room sealed boilers

with storage tank

ZEUS Maior @

STZM@ ed 05/04 ZEUS Maior @

Technical Documentation Technical Documentation

ZEUS Maior @

Wall-hung, room-sealed, fan-assisted boiler

with storage tank

ZEUS 21 Maior @

ZEUS 24 Maior @

General features.

ZEUS Maior @ is a wall-hung room-sealed fan-assisted boiler

(type C) with a storage tank for central heating and producing

domestic hot water.

 is boiler can be also be installed in the B22 conﬁ guration by

using the (optional) kit.

It is equipped with an AISI 316 L stainless steel coil type stor-

age tank, with a total capacity of 60 litres, and a 2-litre d.h.w.

expansion tank (standard feature).

 is boiler is available with an output power of 21,000 kcal/h

(24.4 kW) and 24,000 kcal/h (27.9 kW) with an operation

performance higher than 90%.

Both versions feature electronic control of the ignition, tem-

perature and ﬂ ame modulation.

With the new electronics used this boiler can be connected to

the Remote Control used for maximum simplicity.

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

exchanger and uses the new hydraulic power unit made in

a composite material and where we ﬁ nd the hydraulic circuit

control devices (absolute system pressure switch, adjustable system

by-pass, etc...) besides the circulator and electric 3-way diverter

valve that, according to requirements, allow boiler water to

circulate through the heating system or through the storage

tank coil to produce domestic hot water.

Combustion air intake inside the airtight chamber and the

expulsion of gases are ensured by a fan. A diﬀ erential ﬂ ue

pressure switch controls correct fan operation.

STZM@ ed 05/04 ZEUS Maior @

Technical DocumentationTechnical Documentation

Main dimensions and connections.

Legend:

G - Gas supply

R - System return

M - System delivery

RC - Recirculation (optional)

U - Hot water outlet

E - Cold water inlet

V - Electrical supply

Control panel.

Legend:

1 - Central heating selector switch

2 - Domestic hot water selector switch

3 - Burner ON yellow indicator light

4 - Boiler ON green indicator light

5 - Domestic hot water/Remote Control-Domestic Hot Water

and Central Heating-Reset Switch 0

6 - Boiler shutdown red indicator light

7 - Boiler thermometer

8 - Boiler manometer

Height (mm) Width (mm) Depth (mm)

900 600 450

CONNECTIONS

GAS SYSTEM D.H.W.

G R M U E

1/2” 3/4” 3/4” 1/2” 1/2”

STZM@ ed 05/04 ZEUS Maior @

Technical Documentation Technical Documentation

ZEUS Maior @ main components.

Legend:

1 - Testing holes (A air) - (F ﬂue)

2 - Flue pressure switch

3 - Central heating delivery NTC probe and limit

4 - Primary exchanger

5 - Overtemperature safety thermostat

6 - Combustion chamber

7 - Automatic air vent

8 - Circulator

9 - Gas valve

10 - Motorised 3-way diverter valve

11 - System draining cock

12 - System ﬁlling valve

13 - Airtight chamber

14 - Draught diverter

15 - System expansion tank

16 - Ignition/detection electrodes

17 - Burner

18 - Domestic hot water NTC probe

19 - 316L stainless steel storage tank

20 - System water pressure switch (absolute)

21 - System 3-bar safety valve

22 - D.h.w. 8-bar safety valve

23 - Storage tank draining cock

24 - Fumes expulsion fan

25 - Pressure point, positive signal

26 - Pressure point, negative signal

27 - D.h.w. expansion tank

28 - Adjustable by-pass

STZM@ ed 05/04 ZEUS Maior @

Technical DocumentationTechnical Documentation

Hot water for central heating and domestic use is produced

by a primary and a secondary (d.h.w.) circuit that work as

required.

ZEUS Maior @ Hydraulic diagram.

Legend:

1 - Gas valve

2 - Stainless steel coil for the storage tank

3 - Magnesium anode

4 - Storage tank

5 - Automatic air vent

6 - Main burner

7 - Combustion chamber

8 - Primary exchanger

9 - Draught diverter

10 - Fumes expulsion fan

11 - Flue pressure switch

12 - Airtight chamber

13 - Central heating delivery NTC probe e limit

14 - Overtemperature safety thermostat

15 - Expansion tank

16 - Circulator

17 - Adjustable by-pass

18 - System water pressure switch (absolute)

19 - System draining cock

20 - Motorised 3-way diverter valve

21 - Domestic hot water NTC probe

22 - 3-bar safety valve

23 - Filling valve

24 - D.h.w. expansion tank

25 - 8-bar safety valve

26 - One-way valve

27 - Storage tank draining cock

R - System return

M - System delivery

G - Gas supply

U - Domestic hot water outlet

E - Domestic cold water inlet

STZM@ ed 05/04 ZEUS Maior @

Technical Documentation Technical Documentation

A = Head available to the system at top speed with the by-pass oﬀ

(adjustment screw tightened right down)

B = Head available to the system at top speed (screw tightened 1.5 turns

compared to the adjustment screw which is completely unscrewed)

C = Head available to the system at top speed with the by-pass open

(adjustment screw completely unscrewed)

Primary circuit (boiler circuit).

e primary circuit, with its control and safety devices, is

started each time either a central heating or domestic hot

water request is made.

Operation.

e heat contained in the fumes produced by combustion is

absorbed by the copper blades of the water-gas exchanger (8)

which, in turn, transfers it to the water circulating inside by

means of the boiler circulator (16).

e water is transferred directly to the system or it can be devi-

ated to the storage tank coil (2). is depends on what position

the electric 3-way diverter valve (20) is in which, according to

the request, either lets water ﬂow through the system delivery

(M) and return (R) pipes or to the coil (2).

Head-ﬂow rate graph.

e course of the curve that represents the ﬂow rate/head ratio

depends on how the system by-pass is set which, according to

the position, gives the system a bigger or smaller head. e

characteristic curves, based on the by-pass setting, are shown

in the following graph.

Boiler circulator (1).

e pump works on the primary circuit immediately after the

3-way diverter valve to which it is connected. It is part of the

integrated multifunction unit made in a composite material.

e automatic air vent (2) is housed on the body.

Primary exchanger (1).

is is a lamellar water-gas exchanger with copper tubes and

ﬁns (96 ﬁns in the ZEUS 21 version and 109 in the ZEUS 24

version) and at whose outlet (delivery) both the central heat-

ing NTC delivery probe (2) and the overtemperature safety

thermostat (3) are located.

e four pipes it is made of are connected in series (4).

It is connected to the circulator delivery and to the primary

circuit delivery by push-ﬁtted pipes (5) and O rings (6) locked

with forks (7).

Head (kPa)

Flow rate Litres/h

Head (m H2O)

ZEUS 21 Maior @

Head (kPa)

Flow rate Litres/h

Head (m H2O)

ZEUS 24 Maior @

Delivery

Return

STZM@ ed 05/04 ZEUS Maior @

Technical DocumentationTechnical Documentation

Motorised 3-way valve.

It is an electric 3-way diverter valve that works on the primary

circuit return and, according to the request made (d.h.w. or

heating), it lets boiler water into the central heating system or

into the storage tank coil. is depends on the position of the

shutter (5) which closes passage to the system while simulta-

neously opening it to the storage tank (d.h.w. position) or vice

versa (central heating position).

e shutter (5) is shifted into both positions when the motor

(1) is powered (1).

e hydraulic part consists of composite material (2) unit

integrating the circulator and operated by a motor (1) that

shifts it as required.

Operation.

When the central heating or domestic hot water position has

to be reached the adjustment board starts the motor (1).

When it is working, with each 180° rotation, it shifts the shut-

ter (5) and either compresses (central heating position) or releases

(d.h.w. position) the shutter counteracting spring (4).

Both the spring (4) and shutter (5) are inside the 3-way car-

tridge.

e hydraulically controlled reaching of the position requested

causes, alternately, the opening and closing of one of the two

limit microswitches (6) located inside the motor box (1).

is makes it possible to cut power oﬀ to the motor, block-

ing it in the position reached and to enable motor operation

only when a diﬀerent request is made (d.h.w. or central heating

signal).

Circulator

delivery

SYSTEM

RETURN

COIL

RETURN

Storage

tank coil

return

System

return

CIRCULATOR

RETURN

STZM@ ed 05/04 ZEUS Maior @

Technical Documentation Technical Documentation

Safety devices and controls.

Adjustable system by-pass (2).

is device ensures circulation of water in the primary circuit

(between delivery and return) even when this is prevented by

the system’s high resistance.

It is mounted on the delivery manifold unit (1) and can be

adjusted by a screw, accessible from the bottom of the valve

supporting plate.

System ﬁlling device (3).

It is a ball cock mounted between the boiler circuit and the

inlet of the domestic cold water and permits pressurisation of

the central heating system.

e cock is connected to a ﬁll-up ﬁtting (4) which, in turn, is

connected to the motorised 3-way diverter valve unit.

System pressure switch (5).

It reads the pressure inside the primary circuit.

It is housed in the delivery manifold unit (1) and coupled to a

microswitch that prevents the burner working when pressure

is below 0.3 bar.

It prevents the main exchanger from overheating.

Automatic air vent (6).

It automatically expels any gaseous substances from the boiler

circuit.

It is mounted on the pump’s delivery side directly on the

hydraulic unit.

3-bar safety valve (7).

is valve prevents the safety pressure (3 bar) being exceeded

in the primary circuit.

It is coupled to the front of the delivery manifold unit (1) and

ﬁxed on the outside by a fork.

When this valve triggers water exits from the delivery pipe.

System expansion tank (8).

It compensates for variations in volume as a result of heating

the water which also limits pressure variations.

It has a useful capacity of 5.9 litres (ZEUS 21 version) and 7.1

litres (ZEUS 24 version) and a pre-load pressure of 1.0 bar.

It is located at the front of the storage tank in front of the

boiler.

System

delivery

STZM@ ed 05/04 ZEUS Maior @

Technical DocumentationTechnical Documentation

Secondary circuit (d.h.w. circuit).

e domestic hot water circuit starts working whenever the

temperature of the water in the storage tank (2) has to be

taken to the value wanted, measured by the d.h.w. NTC

probe (9).

is can happen if some hot water is drawn or when restoring

pressure drops due to heat loss.

Operation.

When domestic hot water is drawn, the modulation board

starts the boiler circulator (7) working and powers the motor

of the electric 3-way diverter valve (8).

When the valve shifts into the d.h.w. position (see operation

of the electric 3-way diverter valve) the system return (R) pipe

closes and simultaneously the passage opens to the storage

tank coil (4).

is prevents circulation in the heating system while it is al-

lowed in the coil (4) which, through its walls, lets the cold water

absorb the heat contained in the primary circuit water.

In this phase the central heating function is oﬀ, the production

of domestic hot water having priority.

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