EN • 4
GENERAL DESCRIPTION
This boiler is available in 5 models.
• Combination boiler
(central heating and domestic hot water)
.
• Designed for connection to a chimney.
• TANK-IN-TANK indirect storage type domestic hot water production.
• Equipment required: a water connection kit for heating circuit
supply
(optional)
.
• The control panel contains a main switch, a control thermostat,
a thermometer, a Summer/Winter switch and knockout for the
built-in ACV control system
(to be ordered separately)
.
• 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.
OPERATING PRINCIPLE
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.
Indirect hot water heating
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.
Easy to control and safe
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 resetable safety
thermostat switches off the burner if the temperature reaches
103°C.
DESIGN CHARACTERISTICS
Lining
The boiler is protected by a steel lining that first of all undergoes
a degreasing and phosphation process before being lacquered and
cured at 220°C.
Heating body
The boiler heat exchanger is constructed from carbon steel STW
22 with welded joints. It is hydraulically tested under a pressure of
4.5 bar (maximum working pressure = 3 bar).
“Tank-in-Tank” type storage exchanger
The ring-shaped inner tank is made from 18/10 austenitic
stainless steel and features a large heat exchanger surface for
rapid hot water heating. It is corrugated over its full height by
means of an exclusive production process, and is fully argon welded
using the TIG (Tungsten Inert Gas) method.
Combustion gas circuit
The combustion gas circuit is protected by high temperature paint.
The circuit comprises:
•
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.
•
Combustion camber
Sealed combustion chamber. The combustion chamber is water-
cooled.
Insulation
The boiler body has a full sprayed-on rigid polyurethane foam insulation
with a high insulation coefficient. No CFC emissions are created by
the spraying process.
Oil Burner
BM R 31 BM R 51 BM 101
F25 / F35
-
-
F45
-
-
F55
-
-
Gas Burner
BG 2000-S
G25 / G35 / G45 / G55
Climatic controller
It is possible integrated a climatic controller in the control panel.
Control panel
1. Control thermostat
(60/90°C)
2. Main switch
3. Summer/Winter switch
4. Thermometer
5. ACV Controller
(opcional)
INTRODUCTION
4
3
5
1
2
Summary of Contents for Delta F25
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