Specifications

5.3 BUILD FEATURES
5.3.1 OUTER BODY
The outer body containing the primary fluid is made of STW 22 steel.
5.3.2 TANK-IN-TANK TYPE EXCHANGER ACCUMULATOR
The ring-shaped inner tank with its large heating surface, used for
producing domestic hot water, is built using Chrome/Nickel 18/10
stainless steel. It is corrugated all the way up to the top using an
exclusive production process and entirely argon arc welded using the
TIG (Tungsten Inert Gas) method.
5.3.3 COMBUSTION GAS CIRCUIT
The combustion gas circuit is protected by a coat of paint. The
combustion gas circuit comprises:
5.3.3.1 Flue pipes
Depending on output, the various DELTA Performance models
contain either 4 or 8 steel flue pipes with an inner diameter of 64
mm. Each pipe is fitted with a special steel baffle designed to
improve heat exchange and reduce the flue gas temperature.
5.3.3.2 Combustion chamber
All DELTA Performance models feature a fully water-cooled
combustion chamber.
5.3.4 INSULATION
The boiler body is fully insulated by rigid polyurethane foam with a high
thermal insulation coefficient. This is sprayed onto the tank without
using any CFCs.
5.3.5 JACKET
The boiler is covered by a steel jacket which has been scoured and
phosphated before being stove finished at 220° C.
5.3.6 BURNER
DELTA Performance F25 and F35 boilers are shipped with the ACV BM
R 31 gas burner, F45 boilers are fitted with the ACV BM R 51
burner and the F55 boiler can be fitted with the ACV BM 101 burner.
These new generation burners incorporate the latest technological
developments and meet all safety, efficiency and clean combustion
requirements. They come fitted with a preheating device, with the
exception of the BM 101. DELTA G25, G35, G45 and G55 performance
boilers all ship with the ACV BG 2000-S gas burner.
IMPORTANT
For assembly, the various settings, start-up and servicing
please see the technical instructions which come with
the burner.
5.3.7 CONTROL PANEL (FIG. 17)
1 - Thermostat adjustable between 60° and 90° C
2 - On/off switch
3 - Summer/Winter selector switch
4 - Thermometer
5 - Knockout for control system (optional).
1. Inner ring-shaped tank containing the domestic hot water
2. External body containing central heating circuit
3. Insulation
4. Jacket
5. Flue pipes
6. Baffles
7. Thermostat adjustable between 60° and 90° C
8. Lower central heating return
9. Combustion chamber
10. Chamber plate
11. Emptying the boiler
12. Upper central heating flow pipe and return
13. Chimney connection
14. Control panel
15. Domestic hot water outlet
16. Domestic cold water inlet
17. Cut-off thermostat 95° C / Thermometer
18. Manually reset 103° C safety thermostat
19. Gas or oil burner
5 DESCRIPTION
Fig. 16: The boiler
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Fig. 17: Control panel
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