User guide

8
Boiler Specication
Boiler Design
These boilers are designed for use as part of a sealed water
central heating system with fully pumped circulation. The
pump, expansion vessel and associated safety devices are all
tted within the boiler.
14343
BOILER SPECIFICATION 24c 30c
Lift weight 37 kg (82 Ib) 38 kg (84 Ib)
Total weight (installed) 40 kg (88 Ib) 41 kg (90 Ib)
Gas connection Ø O.D. 22mm. copper 22mm. copper
Heating flow and return connection Ø O.D. 22mm. copper 22mm. copper
Domestic hot water connection Ø O.D. 15mm. copper 15mm. copper
Condensate connection Ø I.D. 21.5mm. plastic 21.5mm. plastic
Safety valve discharge connection Ø O.D. 15mm. copper 15mm. copper
Heating circuit safety valve (preset) 3.5 bar (53.5 Ibf/in
2
) 3.5 bar (53.5 Ibf/in
2
)
Heating system minimum pressure 0.8 bar (11.6 Ibf/in
2
) 0.8 bar (11.6Ibf/in
2
)
Heating system nominal pressure 1.5 bar (21.7 Ibf/in
2
) 1.5 bar (21.7 Ibf/in
2
)
Maximum domestic water supply pressure 8 bar (116 Ibf/in
2
) 8 bar (116 Ibf/in
2
)
Minimum domestic water supply pressure 0.25 bar (3.6 Ibf/in
2
) 0.25 bar (3.6 Ibf/in
2
)
Maximum domestic hot water temperature 64ºC 64ºC
Maximum central heating temperature 85ºC 85ºC
Maximum domestic hot water output at 35
o
Δ T 9.4
L/min. 10.5 L/min.
Expansion vessel capacity 7 litres (1.53 gallons) 8 litres (1.76 gallons)
Expansion vessel pre-charge pressure 1.0bar (14.6 Ibf/in
2
) 1.0bar (14.6 Ibf/in
2
)
Minimum flow rate around the 776 L/hr. 1032 L/hr.
central heating circuit at 35 rise
Electrical supply 230V~50Hz fused 5A 230V~50Hz fused 5A
Maximum power comsumption 220 Watt 220 Watt
EN60529 IP clasification IPX4D IPX4D
Internal fuse rating on main PCB 2A 2A
Gas supply (governed meter only - NG)* G20 - NG /G31 - Propane G20 - NG /G31- Propane
Gas category II
2H3P
II
2H3P
Inlet gas working pressure - NG 20 mbar 20 mbar
Heat input maximum 25.7 kW. 28.5 kW.
Heat output maximum 24.7 kW. 27.6 kW.
Heat input minimum 11 kW. 11 kW.
Heat output minimum 10.2 kW. 10.2 kW.
Usefull efficiency at 100% load 96% 96.8%
Usefull efficiency at 30% load 102.4% 103.3%
Burner injector NG / LPG (G31) 1.20 mm / 0.75mm 1.15 mm / 0.75mm
Burner pressure maximum NG** 12.5 mbar 14 mbar
Burner pressure minimum NG 2.5 mbar 2.3 mbar
SEDBUK rating Band B 86.0% Band 86.4%
NOx Class 3 Class 3
Flue Type C12-C32-C42-C52 C12-C32-C42-C52
* See Commissioning section for NG (G20) to LPG (G31) conversion
** Installation to (G31) Propane is by conversion kit only
The appliance has a built in frost protection device that
protects the boiler from freezing.
Once the controls are set the boiler operates automatically.