30
Technical features and dimensions
2. Technical features and dimensions
2.1
Technical features
This boiler is equipped with a built-in fully pre-mixed gas burner, a condensing heat exchanger, a twin-coil 300L water heater and hydraulic
and electronic systems for connection to a solar plant.
The following models are available:
•
KRBS
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water.
•
KRBS M
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water. Version with solar
three-way valve for thermal discharge.
•
KRBS V
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water. Version preset for
connection to a high-temperature and a low-temperature zone.
•
KRBS MV
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water. Version with solar
three-way valve for thermal discharge, preset for connection to a high-temperature zone and a low-temperature zone.
•
KRBS Z
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water. Version preset for
connection to a high-temperature zone and two low-temperature zones.
•
KRBS MZ
Condensing boiler with sealed chamber and forced draught, supplying CH water and domestic hot water. Version with solar
three-way valve for thermal discharge, preset for connection to a high-temperature zone and two low-temperature zones.
The following power rates are available:
•
12
with heat output of 12.0 kW
•
24
with heat output of 23.7 kW
•
28
with heat output of 26.4 kW
•
32
with heat output of 30.4 kW
The boilers meet local applicable Directives enforced in the country of destination, which are stated on their rating plate.
Installation in any other country may be a source of danger for people, animals and property.
The key technical features of the boilers are listed below.
2.1.1
Manufacturing characteristics
•
IPX5D electrically protected control panel.
•
Integrated, modulating electronic safety board.
•
Solar plant electronic control board.
•
Electronic start-up with igniter and ionisation lame detection.
•
Stainless steel, fully pre-mixed burner.
•
Mono-thermal, high eiciency, composite and stainless steel heat
exchanger with air purging device.
•
Twin shutter modulating gas valve with constant air/gas ratio.
•
Modulating, electronically managed combustion fan.
•
Modulating CH circulation pump with built-in air purging device.
•
Heating circuit pressure sensor.
•
Hydraulic separator, mixing valves and circulation pumps for
high- and low-temperature outlets (V, MV, Z and MZ versions).
•
Circulation pump for solar plant.
•
Solar plant hydraulic control unit.
•
Heating low water temperature probe (double).
•
Temperature probe for water heater (bottom and top parts).
•
Temperature probe for solar collector.
•
Temperature probe for solar valve (M, MV and MZ versions).
•
Safety limit thermostat on low-temperature low zones.
•
Double safety probe on CH low.
•
Flue gas thermostat on discharge tower
•
Flue gas probe on primary heat exchanger.
•
Integrated, automatic by-pass.
•
Heating expansion vessel - 10 litres.
•
Domestic hot water expansion vessel - 12 litres.
•
Solar expansion vessel - 18 litres.
•
Central heating system loading and draining cocks.
•
Water heater discharge cock.
•
3-bar safety valve for CH circuit.
•
6-bar safety valve for DHW circuit.
•
6-bar safety valve for solar circuit.
•
Motorised deviating valve for water heater heating.
•
Motorised deviating valve for thermal discharge (M, MV and MZ
versions).
