Immergas CAESAR 14 Star Guide

STCS ed 07/02 CAESAR Star

Technical Documentation Technical Documentation

CAESAR STAR

Instantaneous wall-hung room

sealed fan-assisted water heater.

CAESAR 14 Star

General features.

CAESAR Star is a room-sealed water heater featuring

an electronic flame modulation system for regulating

the temperature thanks to a microprocessor-controlled

modulation board and flow and temperature sensors.

CAESAR 14 Star features standard electronic burner

ignition and a wet combustion chamber copper

e changer.

Notwithstanding its very compact size, the appliance

has a power of 21,000 Kcal/h (24.4 kW) corresponding

to a flow of 14 l/min with ∆T 25°C.

CAESAR 14 Star is factory set for connecting to the

broad range of couple-on aspiration and e haust kits

with silicone seals and, thanks to a special cover kit

(optional), it can be installed in open chamber and fan-

assisted configuration (B22). Another optional feature

is an antifreeze safety device that protects it against

temperatures as low as -15°C.

STCS ed 07/02 CAESAR Star

Technical Documentation

Main dimensions.

Key:

U - domestic hot water outlet

G - as supply

E - d.h.w. inlet

V - power connections

)mm(thgieH)mm(htdiW)mm(htpeD

036573052

snoitcennoC

SAGRETAWTOHCITSEMOD

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"4/3"2/1"2/1

STCS ed 07/02 CAESAR Star

Technical Documentation Technical Documentation

CAESAR Star main component parts.

Key:

1 - Sealed chamber

2 - Fume expulsion fan

3 - D.h.w. exchan er

4 - I nition/detection low electrode

5 - Gas valve

6 - D. h. w. NTC probe

7 - Fan safety pressure switch

8 - Overheat. safety thermostat

CAESAR Star Control anel.

Key:

1 - Bathroom water heater stop red indicator

li ht

2 - Flame yellow indicator li ht

3 - Operation switch: 0/ (Reset) and on

temperature switch

9 - Flow limiter

10 - 10 bar safety valve / one way valve

11 - Flow meter

12 - Drau ht diverter.

13 - Combustion chamber

14 - Burner

15 - D.h.w. limit thermostat

16 - Cold water inlet cock

STCS ed 07/02 CAESAR Star

Technical Documentation

Hydraulic circuit.

Key:

1 - Fume extraction fan

2 - Sealed chamber

3 - Exchan er

4 - Main burner

5 - Gas valve

6 - D.h.w. adjustment NTC probe

7 - Overheat. temp. safety thermostat

8 - Air pressure switch

9 - Drau ht diverter

10 - Exchan er safety thermostat

11 - Flow limiter

12 - 10 bar safety valve

13 - One way valve

14 - Flow meter

15 - Water inlet filter

16 - D.h.w. inlet cock

U - D.h.w. outlet

G - Gas supply

E - D.h.w. inlet

STCS ed 07/02 CAESAR Star

Technical Documentation Technical Documentation

Hydraulic circuit.

The hydraulic circuit with relevant control and safety

devices is engaged every time there is a request for

domestic hot water.

Operation.

Drawing at least 2.5 l/min of domestic hot water means

a flow of cold water inside the flow measuring device

(14) and consequent enabling of operation.

Following this, the adjustment circuit ignites the burner.

This way the heat generated by the flame and con-

tained in the fumes produced by combustion is

absorbed by the copper blades of the water-gas

e changer (3) which in turn transfers the heat to the

water flowing inside.

Exchanger.

This is a water-gas e changer (1) with pipes and flaps

in copper at the e it of which is positioned the

overheating safety thermostat (2).

It is of the so-called “wet chamber” type because the

lower part (3) around which is wrapped the hot water

outlet pipe (4), represents in fact the combustion

chamber.

NOTE: to maintain the characteristics of efficiency of

the e changer, we recommend installing a

“polyphosphate dosing” kit if the water is such as to

have characteristics that could create scale on the

pipes (recommended when water hardness exceeds

25 French de rees).

Safety devices and controls.

Flow meter (1).

This is a rotating magnetic sensor fitted at the cold

water flow inlet.

By means of a three-pole connector (2) it is electrically

connected to the adjustment board, allowing this to

measure the flow of water to determine minimum

ignition value (2.5 l/min) and optimise temperature

adjustment.

10 bar safety valve unit (1).

Prevents safety pressure (10 bar) being e ceeded in

the hydraulic circuit of the water heater.

It is connected to the cold water inlet pipe.

Inside is a 10 l/min flow limiter (2) and a one way valve

that prevents the return of hot water towards the mains

supply.

STCS ed 07/02 CAESAR Star

Technical Documentation

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 energised, both inner val-

ve 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 (6), the fuel is injected

into the venturi pipes (ramps) inside which the air-gas

mi 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 modulation

board.

The ma imum and minimum outlet pressure settings

can be made on this valve (see as adjustments).

Main electrical coils (3).

Two coils of the ON-OFF type energised (230V AC)

by the adjustment board when the burner has to be

ignited.

These are electrically connected in parallel and

energised by mains power through a special connec-

tor (2).

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.

Gas circuit.

Burner.

The burner consists of 12 horizontal venturi pipes (4)

in which the gas is injected by an equal number of

nozzles (6) mounted on the special header (7).

Ignition occurs by means of the adjustment board which

controls the ignition/detection electrode (5).

Ignition and detection electrode (5).

During ignition, this is controlled by the adjustment

board which produces an electrical charge between

its end and the burner surface that ignites the air-gas

mi .

When the burner is on, it also detects the flame on the

burner enabling the adjustment board to conclude the

ignition cycle and change the gas pressure according

to need.

This is positioned on the front of the burner in line with

the centre ramp.

STCS ed 07/02 CAESAR Star

Technical Documentation Technical Documentation

Gas adjustments.

Ma and minimum gas pressure adjustments can be

made by means of the gas valve respecting the values

shown on the tables relating to the type of

corresponding gas.

Measurements are made using a U-shaped differen-

tial pressure gauge connected to a “Y” to be placed in

between in the small silicone tube connecting the gas

valve to the sealed chamber and to the gas valve outlet

pressure point.

Valve Sit 845.

Maximum pressure setting.

Draw d.h.w. after setting the temperature switch at

ma imum.

Turn the brass nut (3) clockwise to increase the

pressure to the burner and anticlockwise to decrease

it.

Adjusting minimum pressure

(to be done after adjusting max pressure).

After interrupting power to the modulation coil, turn the

crosshead screw (2) clockwise to increase pressure

to the burner and anticlockwise to decrease pressure.

Key:

1 - Coil

2 - Minimum output setscrew

3 - Maximum output setscrew

4 - Gas valve outlet pressure point

5 - Gas valve inlet pressure point

6 - Protection cap

Valvola Sit 845

Changing type of gas.

Adaptation to a type of gas different to that for which

the boiler is intended, can be done by using the special

kits (natural as or LPG).

The changeover consists in replacing the burner

nozzles and in moving to the modulation board of the

“NATURAL GAS- LPG” (S1) bridge.

The minimum and ma imum pressures are then set

on the gas valve in the way described above.

The burner ignition pressure is not adjusted

because the type of board operation does not require

such setting (see modulation board operation).

NOTE: any changes made to enable the unit to use

G110 gas (town as), besides the use of a special

nozzle kit and performance of the same operations

indicated above, also requires shifting jumper switch

“S1” onto switch “S2” on the electronic board (see

modulation board adjustments).

STCS ed 07/02 CAESAR Star

Technical Documentation

Operation.

The products of combustion, after investing the water-

gas e changer (3), are conveyed to a draught diverter

(5) on top of which the fume e tractor (fan) (1) is fitted.

Fan operation ensures forced e pulsion of the fumes

and, at the same time, creates a vacuum in the sealed

chamber (2) so the combustion air can be e tracted

from outside.

Correct fume e traction is controlled by a special

pressure switch (4), the operation of which enables or

prevents the burner from igniting.

Fume pressure switch (4).

Positioned in the top inner part of the sealed chamber

and detects, by means of special pressure points, the

difference in pressure between the top of the draught

diverter (the point where the extractor is positioned

and operates) and the inside of the sealed chamber.

Operation of this switch causes a microswitch (S3) to

close. This affects the adjustment board and either

enables or prevents burner ignition.

Fan (1).

The e tractor operates downstream of the combustion

chamber and is fitted vertically in the top part of the

draught diverter (5) from which it e tracts the fumes

and conveys these into the e haust pipes to which the

boiler is connected.

Fume circuit.

It is controlled by the adjustment board and its

operation coincides with that of the burner.

STCS ed 07/02 CAESAR Star

Technical Documentation Technical Documentation

Extraction and exhaust systems.

The CAESAR Star is set for connecting to the coupling

e traction/e haust ducts and can be installed in sealed

chamber fan-assisted configuration (type C) or, thanks

to a special kit, in open chamber fan-assisted version

(type B22).

As regards the load losses relating to each accessory

and the various possible combinations and the use of

diaphragms to be fitted according to the length of the

pipes, see instructions relating to extraction and

exhaust ends (CAESAR Star instruction booklet).

Accessories (bends, extensions and end pieces) are

joined by coupling and seal is provided by special

silicone lip seals.

Open chamber and fan-assisted (type

B22) configuration for installation

outdoors in a partially protected area

(see illustration alongside).

Using a special cover (4) to be placed on the top part

of the sealed chamber, the CAESAR Star appliance

can be fitted in a partially protected place.

This way the appliance works in open chamber and

fan-assisted (B22) configuration.

Extraction.

To fit the cover (4), the two caps (1) that close the

holes in the top part of the sealed chamber must be

removed.

The e traction of comburent air is done directly from

the environment e ploiting the free space between the

lower part of the cover (4) and the upper part of the

boiler.

Exhaust.

The 80 mm diameter union to the e haust ducts is

obtained by means of a flange (3) used in doubled

systems.

The use of special accessories permits horizontal type

(A) or vertical type (B) e haust.

To avoid condensation problems, the e haust duct

must be restricted to 5 metres for normal pipes and

12 metres for insulated pipes.

STCS ed 07/02 CAESAR Star

Technical Documentation

Sealed chamber fan-assisted

configuration (type C).

Exhaust.

Connection to the e haust pipes is by means of a

flange (1) or a flanged bend to be fitted on the centre

hole (6) on the top section of the sealed chamber,

placing in between a special shaped seal (5).

This flange differs according to whether the doubled

or concentric system is used.

In the former case, the duct for the combustion air (8)

is closed, while in the latter case it is used.

To ensure correct boiler operation, a diaphragm (7)

will have to be fitted on the e haust pipe (6) between

the flange used (1).

Diaphragms are envisaged of different diameter which

must be fitted according to the type of duct and its

length (see CAESAR Star instruction booklet).

Extraction.

Using the doubled system, connection to the e traction

ducts is done in the same way as for the e haust pipes,

linking up to one of the two holes with diameter 80 mm

(2) on the top section of the sealed chamber.

The hole which is not used is closed using one of the

caps (3), placing in between the relevant seal (4) fea-

tured on the appliance.

If coa ial pipes are used, e traction is done by e -

ploiting the concentric hole outside the e haust pipe

(8).

Extraction and Exhaust Kits.

The kits with the relevant accessories make it possible

to use two concentric systems and a doubled

system.As regards flow resistance relating to each

accessory, the various possible combinations and use

of the diaphragms to be installed according to the

length of the ducts, see the instructions relating to the

e traction and e haust ends (CAESAR Star

instruction booklet).

The accessories (bends, extensions and end pieces)

are connected by means of slot-in couplings and seal

is ensured by means of silicone-lip seals.

Horizontal concentric slot-in kit Ø 60/100.

The e haust pipe (Ø 60 mm) is fitted inside the

e traction pipe (Ø 100 mm).

Connection to the boiler is by means of a 90° (2) fully

adjustable bend which, by means of the necessary e -

tensions, must be connected to the e traction and e -

haust end piece (3).

The ma imum overall length allowed beyond the first

bend (2) is 3 straight horizontal metres.

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