4
DESCRIPTION
GENERAL DESCRIPTION
• Combined boiler and water heater
(heating and domestic hot water)
.
• Hot water generated by an indirect storage system.
• Equipment required: a water connection kit for the heating circuit
supply
(optional)
.
• The control panel contains a main switch, a Summer/Winter
switch, an energy selection switch, an indicator lamp, an
optimiser, a hot water control thermostat, a thermostat-pressure
gauge and a heating control thermostat.
• The boiler may be connected directly to the chimney using a B23
chimney connection.
• Model BNE 1: output between 20 and 25 kW.
• Model BNE 2: output between 28 and 36 kW.
• Model BNE 3: output between 36.5 and 51 kW.
OPERATING PRINCIPLE
Two thermostats are used to adjust the temperature settings for the
heating and hot water. The addition of the hot water priority device
incorporated in the wiring ensures an ample supply of hot water.
A manual reset high limit thermostat locks the burner if the boiler
temperature exceeds 103°C.
In summer, when heating is not required, the heating pump and
burner can be switched off and a 2.4 kW resistor used for the hot
water requirements.
(BEWARE: The water heating efficiency will be
lower than that with the oil-fired burner).
DESIGN CHARACTERISTICS
Outer body
The outer body which holds the primary water is made of
STW 22 heavy gauge steel.
Smoke flues
The boiler smoke flues are accessed via the front and contain
a set of removable stainless chromium steel turbulators, specially
designed to provide optimum combustion efficiency.
Combustion chamber
The boiler has a large, water-cooled combustion chamber, designed to
ensure good development of the burner flame.
Removable burner chamber plate
The burner chamber plate, mounted on a hinge (left or right) is made
of STW 22 steel. It is insulated from the flame by a ceramic fibre pad
and a vermiculite brick.
Insulation
The boiler body has full sprayed-on rigid, CFC-free polyurethane
foam insulation with a high insulation coefficient.
Casing
The boiler is covered with a steel casing that has been stove
enamelled at 220°C after scouring and phosphating.
Storage exchanger
The inner hot water tank with integrated heating surface
is made of stainless steel that has been fully argon welded using the
TIG (Tungsten Insert Gas) method.
Electrical resistor
The electrical resistor, made entirely of stainless steel, is mounted on
a flange.
BOILER VIEWS AND KEY TO PARTS
1. Cold water inlet
2. Hot water thermostat pocket
3. Hot water outlet
4. Steel outer tank
5. Stainless steel inner tank
6. Heating
return
7. Chimney connection
8. Heating
outlet
9. Heating circuit drain cock
10. Combustion
chamber
11. Steel base
12. Exchanger
(flues)
13. Burner
14. Flame inspection window
15. Left/right removable burner chamber plate
16. Electrical resistor
17. Polyurethane foam insulation
18. Front panel
19. Control panel
20. Heating circuit vent
1
11
12
19
16
13
20
2
3
6
7
8
8
4
10
9
17
15
14
18
5
Fig. 4