Alpha CD12S, CD20S, CD28S, CD25X, CD28X Instruction
Supplementary LPG Boiler
Instructions
Alpha CD12S/20S/28S/25X/28X
Wall Mounted, Fan Assisted, Room Sealed, Gas Fired
High Efficiency Condensing Boilers
For Technical help or for Service call ...
ALPHA HELPLINE Tel: 0870 3001964
website:www.alpha-innovation.co.uk
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
British Gas
Service Listed
Alpha CD12S British Gas G.C. No. 41 532 17
0051
Alpha CD20S British Gas G.C. No. 41 532 19
Alpha CD28S British Gas G.C. No. 41 532 21
Alpha CD25X British Gas G.C. No. 47 532 40
Alpha CD28X British Gas G.C. No. 47 532 38
For use with LPG (Propane) only
Leave these instructions with the User
1 INTRODUCTION
This supplement is for the LPG model of the boiler; it must be read in conjunction with the 'Installation and Servicing
Instructions' supplied with the boiler and provides the extra information which is particular to LPG.
The Alpha CD25X and CD28X are combination boilers providing both central heating and domestic hot water at mains
pressure.
The Alpha CD12S, CD20S and CD28S are system boilers providing heating only for sealed central heating systems.
The boilers are designed for use with a fully pumped, sealed and pressurised heating system using only PROPANE gas.
2 TECHNICAL DA T A
PERFORMANCE - PROPANE GAS (CAT I3P 3P - G31 - 37 mbar)
Alpha CD12S
Central Heating
Heat Input (H
)kW
s
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Heat Output (Hs condensing) kW
(50°C/30°C) Btu/h
Heat Output (Hi non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Room sealed
chamber panel
fitted
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate m³/h
ft³/h
MAX.
13.6
46 400
12.3
41 960
12.8
43 650
12.0
40 950
7.57
3.0
37.0
14.8
0.52
18.3
Alpha CD28S
Central Heating
Heat Input (H
)kW
s
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Heat Output (Hs condensing) kW
(50°C/30°C) Btu/h
Heat Output (Hi non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Room sealed
chamber panel
fitted
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate m³/h
ft³/h
MAX.
31.8
108 500
28.7
97 920
30.1
102 700
28.0
95 540
7.5
3.0
1.21
42.7
21 500
19 450
19 450
18 420
37.0
14.8
MIN.
2.9
9 890
2.6
8 870
2.5
8 530
2.4
8 200
0.18
0.07
0.11
3.88
MIN.
6.3
5.7
5.7
5.4
0.4
0.16
0.24
8.47
Alpha CD20S
Central Heating
Heat Input (H
)kW
s
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Heat Output (Hs condensing) kW
(50°C/30°C) Btu/h
Heat Output (Hi non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Room sealed
chamber panel
fitted
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate m³/h
ft³/h
MAX.
20.4
69 600
18.4
62 780
19.5
66 500
18.0
61 420
8.17
3.27
0.78
27.5
12 960
11 950
11 950
11 260
37.0
14.8
MIN.
3.8
3.5
3.5
3.3
0.35
0.14
0.15
5.29
%CO2 content (± 0.2%) Sedbuk rating
Boiler model
Min
CD12S
CD20S
CD28S
CD25X
CD28X
CD12/20/25/28 LPG Supplement
2
10.2
10.2
10.3
10.0
10.1
LPG (propane) Efficiency
CH Max
10.6
10.6
10.6
10.6
10.7
DHW max
-
-
-
10.6
10.7
band
A
A
A
A
A
NOx class
5
5
5
5
5
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