Specifications

5.1 OVERVIEW
• Combination boiler (central heating and domestic hot water).
• Designed for connection to a chimney.
•TANK-IN-TANK indirect storage type domestic hot water production.
•Fittings required to connect the hydraulic kit for feeding the heating
circuit (available as an optional extra).
•Control panel with on/off switch, adjustable thermostat,
thermometer, Summer/Winter selector and knockout for fitting ACV
integrated control system (optional).
•DELTA Performance 25, 35, 45 and 55 models - with effective
outputs adjustable between 22 and 62 kW - are shipped without
burners. They can be fitted with most gas or oil burners available
on the market.
•DELTA Performance F25, F35 and F45 models - with effective
outputs adjustable between 22 and 54 kW - are shipped with an
ACV BM R oil burner.
• DELTA Performance F55 models - with effective outputs adjustable
between 45 and 62 kW - are shipped with an ACV BM oil burner.
•DELTA Performance G25, G35, G45 and G55 models - with
effective outputs adjustable between 22.5 and 49 kW - are shipped
with a BG 2000-S gas burner.
5.2 DESCRIPTION OF OPERATION
5.2.1 THE TANK-IN-TANK CONCEPT
The DELTA Performance series differs from traditional hot water
producers in that it has a ring-shaped tank immersed in the primary
fluid contained in the outer body. When hot water from the central
heating system or the domestic hot water system is needed, the
thermostat starts up the burner.The combustion gases quickly heat up
the primary fluid, thus creating a natural circulation around the tank.
5.2.2 INDIRECTLY HEATING DOMESTIC HOT WATER
This circulation allows easier heat exchange between the primary fluid
and the domestic water, all over the tank surface. The corrugations on
the inner and outer shells of the ring-shaped tank increase the area of
heat exchange still further and thus speed up the process of heating
the domestic water.
5.2.3 EASY TO SET AND SAFETY ASSURED
With a single command, the water temperature of both the primary
circuit and the domestic hot water circuit can be set by the adjustable
thermostat situated underneath the tank in the primary circuit.
A cut-off thermostat, placed on the top of the boiler automatically
switches off the burner when the temperature of the water in the
primary circuit reaches 95° C. A manually reset safety thermostat
switches off the burner if the temperature reaches 103° C.
5 DESCRIPTION
1. Primary fluid
2. Domestic hot water
3. Combustion chamber
Fig. 14: Stainless steel domestic hot water tank
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Fig. 15: Brief description of the boiler
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4. Control thermostat
5. Burner