Baxi Duo-tec, Installation & Servicing Instructions Manual, Page: 10 / 60

10
4.0 Technical Data
© Baxi Heating UK Ltd 2008
0
200 400 600 800 1000 1200
0.5
1
1.5
2
2.5
3
3.5
4
Metre (wg)
Flow Rate (l/h)
Pump - Available Head
0
5
5.5
4.5
4.1 Duo-tec Combi 28 HE LPG
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 780mm
Overall Height Inc Flue Elbow - 965mm
Casing Width - 450mm
Casing Depth - 345mm
Weights
28 model
Packaged Boiler Carton 49.2 kg
Installation Lift Weight 44.2 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
l/min
DHW Flow Rate
@ 30
o C Rise 13.3
DHW Flow Rate
@ 35
o C Rise 11.5
Min Working
DHW Flow Rate
2
Pump
Available Head See graph below
Expansion Vessel - (For Central Heating only.
Integral with appliance)
bar
Min Pre-charge Pressure 0.5
litre
Max Capacity of
CH System
125
Primary Water Content
of Boiler (unpressurised)
2.5
Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Cold Water Mains Inlet - 15mm
DHW Flow - 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
NOx Class 5
Clearances
Above Casing
200 mm Min
Below Casing 200 mm Min
Front 450 mm Min
(For Servicing)
Front 5 mm Min
(In Operation)
L.H. Side 5 mm Min
R.H. Side 5 mm Min
(In Operation)
Heat Input CH (Net) Max Min
28 model kW 24.7 9
Heat Output CH (Non-Condensing)
Max Min
28 model kW 24 8.7
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption
155W
Electrical Protection
IPX0D (with timer)
IPX5D (without timer)
Internal Fuse Rating F2L
Appliance Category CAT I I
2H 3P
Inlet Pressure (Propane - G31)
mbar 37
Injector (Propane - G31)
7.5mm
Appliance Type C
13
C
33
C
53
Heat Output CH (Condensing)
Max Min
28 model kW 25.9 9.5
Heat Input DHW (Net) Max
28 model kW 28.9
Heat Output DHW Max
28 model kW 28
Max Gas Rate (Propane - G31)
(After 10 mins)
28 model kg/h 2.25
Condensate Drain
To accept 21.5mm ( 3 /
4
in) plastic waste pipe
Heat Input CH (Gross) Max Min
28 model kW 27.4 10
Heat Input DHW (Gross) Max
28 model kW 32.1
External Fuse Rating 3A
The efficiency for all is 93.2%
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 0085.
SEDBUK Declaration