Bedienungsanleitung ACV Delta Pro Pack 45 (Seite 4 von 30) (Englisch)

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EN • 4

ENFRRU PL DE IT ES NL

Delta Pro S / Delta Pro Pack : 664Y4900 • E

WORKING PRINCIPLE

The Delta Pro boiler is a high performance hot water producer using indirect

heat transfer due to its Tank-in-Tank technology.

At the centre of the Delta Pro there is a stainless steel cylinder through

which the flue tubes pass. It is surrounded by a mild steel shell containing the

primary water (neutral fluid). The outer shell extends down to the combustion

chamber and also surrounds the flue gas tubes. The heat exchange surface is

therefore larger than that of traditional direct fired hot water boilers.

The gas or oil burner heats the primary fluid which indirectly heats the stainless

steel cylinder containing the hot water. As with all Tank-in-Tank systems, the

cylinder is corrugated over its full height and suspended in the boiler by its hot

and cold water connections.

The fact that the cylinder expands and contracts as it is used and that cold

water is not in contact with the intense heat of the burner flame prevents scale

formation. This resistance to scale, along with the anti-corrosion properties of

the stainless steel mean that sacrificial anodes are not needed.

The Delta Pro has a major advantage over other hot water boilers: it heats hot

water with a primary circuit, which allows the primary fluid to also be used

for heating.

STANDARD EQUIPMENT

DELTA PRO S MODELS 25/45/55 HAVE THE

FOLLOWING COMPONENTS AS STANDARD:

- on/off switch

- summer/winter selector

- thermostat adjustable from 60°C to 90°C

- temperature-pressure gauge

- limit thermostat (auto-reset) 95°C

- manual reset safety thermostat 103°C

- primary safety valve 3Bar

- hot water safety valve 7Bar

- drain down valve

- body fully insulated with rigid polyurethane foam

DELTA PRO PACK MODELS 25/45 HAVE THE

FOLLOWING COMPONENTS AS STANDARD:

- on/off switch

- summer/winter selector

- thermostat adjustable from 60 °C to 90 °C

- temperature-pressure gauge

- limit thermostat (auto-reset) 95 °C

- manual reset safety thermostat 103 °C

- primary safety valve 3 Bar

- hot water safety valve 7 Bar

- manual four-way valve (servomotor available as an option)

- circulator with automatic air eliminator

- primary expansion tank 12 litres

- hot water expansion tank 2 litres

- drain down valve

- body fully isolated with rigid polyurethane foam

OPTIONAL EQUIPMENT

DELTA PRO S 25/45 & PRO PACK 25/45

- Balanced flue kit (except for Delta Pro S 55)

- Control Unit kit (Delta Pro Pack only)

- Servomotor (Delta Pro Pack only)

CONSTRUCTION FEATURES

CASING

The boiler is covered by a steel casing which has been scoured and phosphated

before being stove enamelled at 220°C.

BOILER BODY

The boiler body containing the primary fluid is constructed with STW 22 steel.

This is tested at a pressure of 4.5bar (maximumservice pressure = 3 bar).

TANKINTANK ACCUMULATOR/HEAT EXCHANGER

The internal ring-shaped inner tank is constructed from Chrome/Nickel 18/8

stainless steel and has a large heat exchange surface area to quickly heat the

water. It is corrugated over its height by an exclusive manufacturing process

and is entirely argon arc welded using the TIG (Tungsten Inert Gas) method.

COMBUSTION GAS CIRCUIT

This includes:

• The flue tubes:

The different DELTA Pro models include, depending on their power, 4 or 8

steel flue tubes with an internal diameter of 64mm. Each tube is equipped

with a stainless steel turbulator designed to improve thermal exchange and

reduce flue gas temperature.

• The sealed combustion chamber:

The combustion chamber of all the DELTA Pro models is entirely water

cooled.

INSULATION

The boiler body is fully insulated by rigid polyurethane foam with a high

coefficient thermal insulation, sprayed-on without the use of CFCs.

DESCRIPTION OF THE BOILER

DELTA PRO S 25/45/55 & PRO PACK 25/45 MODELS

1. Flue reduction collar with easy access for servicing

2. Rigid polyurethane foam insulation

3. PVCC dip tube with cold water diffuser

4. Control thermostat bulb

5. Burner

6. Burner chamber plate with refractory ceramic fibre

insulation

7. Cut-off thermostat and manual reset safety thermostat

bulb

8. Flue tubes

9. Turbulators

10. Stainless steel "Tank-in-Tank" hot water cylinder

11. Primary circuit (heating)

12. Combustion chamber

13. Boiler base

14. Heating flow

15. Heating return

16. Domestic hot water outlet

17. Domestic cold water supply

18. Primary hot water safety valve [7 bar]

19. Primary heating safety valve [3 bar]

20. Flue connection Ø 100mm

21. Drain down valve

DELTA PRO PACK 25/45 MODELS

22. Hot water expansion tank [2 litres]

23. Heating circulator with built-in automatic air eliminator

24. Four-way mixer valve (optional motor)

25. Heating expansion tank [12 litres]

DESCRIPTION

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