4.1 124 & 128 Combi
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 700mm
Overall Height Inc Flue Elbow - 860mm
Casing Width - 390mm
Casing Depth - 300mm*
*This can be reduced to 290mm by removing the
boiler control access flap
Weights
Packaged Boiler Carton 36.5kg
Installation Lift Weight 32.5 kg
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommended Operating Range 1-2
DHW Circuit bar
Pressures
Max Operating 8
Min Operating 0.15
Flow Rates (24) (28)
l/min l/min
DHW Flow Rate
@ 30
o
C Rise 10.9 12.9
DHW Flow Rate
@ 35
o
C Rise 9.8 11.5
Min Working
DHW Flow Rate 2 2
Pump
Available Head See graph below
Expansion Vessel - (For Central Heating only.
Integral with appliance)
bar
Min Pre-charge Pressure 1
Max Capacity of litre
CH System 100
Primary Water Content
of Boiler (unpressurised) 2.5
Connections copper tails
Gas Inlet - 22mm
Heating Flow - 22mm
Heating Return - 22mm
Cold Water Inlet - 15mm
Hot Water Outlet - 15mm
Pressure Relief Discharge - 15mm
Temperatures
C.H. Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
D.H.W. Flow Temp (adjustable)
35°C to 60°C max (± 5°C)
dependent upon flow rate
NO
x
Class 5
Clearances
Above Casing 175mm Min
Below Casing 170mm Min*
Front 450mm Min (For Servicing)
Front 5mm Min (In Operation)
L.H. Side 5mm Min
R.H. Side 5mm Min :
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
Electrical Protection
IPX5D
Internal Fuse Rating F2L
Inlet Pressure (Natural Gas - G20)
mbar 20
Injector
24 model mm 4.4
28 model mm 4.6
Condensate Drain
To accept 21.5mm (
3
/
4
in) plastic waste pipe
External Fuse Rating 3A
Heat Input CH Qn Hs (Gross)
Max Min
24 model kW 20.22 3.89
28 model kW 26.64 4.32
Heat Output CH Pn (Non-Condensing)
Max Min
24 model kW 20 3.4
28 model kW 24 3.8
Appliance Category CAT II
2H 3P
Heat Output CH Pnc (Condensing)
Max Min
24 model kW 21.2 3.7
28 model kW 25.3 4.1
Heat Input DHW Qnw Hs (Gross)
Max
24 model kW 27.4
28 model kW 32.1
Heat Output DHW Max
24 model kW 24
28 model kW 28
Max Gas Rate (Natural Gas - G20)
(After 10 mins)
24 model m
3
/h 2.61
28 model m
3
/h 3.05
Inlet Pressure (Propane - G31)
mbar 37
Max Gas Rate (Propane - G31)
(After 10 mins)
24 model kg/h 1.96
28 model kg/h 2.29
NATURAL GAS ONLY !
PROPANE ONLY !
IMPORTANT: Where Low Flow Taps or Fittings are
intended to be used in the DHW system connected it is
strongly recommended that the DHW flow rate DOES
NOT fall below 2.5l/min. This will ensure reliable
operation of the DHW function.
NOTE: All data in this section are nominal values
and subject to normal production tolerances.
SAP 2009 Annual Efficiency for N. G.
models is 89%
This value is used in the UK Government’s Standard
Assessment Procedure (SAP) for energy rating of
dwellings. The test data from which it has been calculated
has been certified by 0035.
SEDBUK Declaration
Electrical Supply 230V~ 50H
z
(Appliance must be connected to an
earthed supply)
Power Consumption
24 model W 85
28 model W 90
Appliance Type C
13
C
33
CO
2
N.G. 9.0% ± 0.7
L.P.G. 10.5% ± 1.0
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