Page 1
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
Page 2
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
Page 3
Alpah CD25X
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 (LPG) m³/h
ft³/h
MAX.
20.4
69 600
18.4
62 780
19.5
66 530
18.0
61 420
4.39
1.76
0.78
27.5
17 740
16 040
16 400
15 350
37.0
14.8
MIN.
5.2
4.7
4.8
4.5
0.54
0.22
0.24
8.47
Alpha CD25X
Domestic Hot Water
Heat Input (H
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Output to Water (Hs)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
Gas Supply Pressure (LPG) mbar
Gas Rate (LPG) m³/h
Flow Rate at 35°C Rise L/min
Specific Flow Rate (D) at 30°C Rise L/min
(Flow rate @ 30K to EN625) gal/min
Alpha CD28X Alpha CD28X
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
MAX.
27.3
93 150
24.6
83 930
25.8
88 030
24.0
81 900
7.6
3.04
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
1.04
36.7
MIN.
18 760
17 060
17 400
16 720
0.12
37.0
14.8
0.21
5.5
5.0
5.1
4.9
0.3
7.4
Domestic Hot Water
Heat Input (H
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Output to Water (Hs)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
Gas Supply Pressure (LPG) mbar
Gas Rate (LPG) m³/h
Flow Rate at 35°C Rise L/min
Specific Flow Rate (D) at 30°C Rise L/min
(Flow rate @ 30K to EN625) gal/min
MAX.
)kW
s
26.6
90 760
17 740
24.0
81 900
16 040
24.0
Room sealed
chamber panel
fitted
81 900
15 350
7.0
2.8
37.0
in wg
14.8
1.0
ft³/h
35.3
9.6
gal/min
2.2
11.2
2.5
MAX.
)kW
s
31.8
108 500
18 760
28.7
97 900
17 060
28.7
Room sealed
chamber panel
fitted
97 900
10.2
4.08
16 720
37.0
in wg
14.8
1.21
ft³/h
42.7
11.4
gal/min
2.5
13.3
2.9
MIN.
5.2
4.7
4.5
0.54
0.22
0.24
8.47
MIN.
5.5
5.0
4.9
0.3
0.12
0.21
7.4
2.3 GAS SUPPLY
The Alpha CD12S boiler requires a gas rate of 0.96 kg/h (2.1 lb/h) or 1.8 litres/h of liquid gas.
The Alpha CD20S boiler requires a gas rate of 1.44 kg/h (3.1 lb/h) or 2.8 litres/h of liquid gas.
The Alpha CD25X boiler requires a gas rate of 1.86 kg/h (4.0 lb/h) or 3.6 litres/h of liquid gas.
The Alpha CD28X/28S boilers require a gas rate of 2.23 kg/h (4.8 lb/h) or 4.2 litres/h of liquid gas.
The supply pipes must be capable of delivering this quantity of gas in addition to the demand from any other appliances in the
house. The boilers require at least a 22 mm gas supply pipe.
The complete installation must be tested for gas soundness against leakage.
The local Propane gas supplier should be consulted, at the installation planning stage, in order to establish the availability of an
adequate supply of gas.
3 BOILER LOCATION
Installation pipes, cylinders and pressure regulators should be fitted in accordance with BS 5482:1. Bulk tank installation must
comply with the requirements of the Home Office code of practice for the storage of liquefied petroleum gas at fixed installations.
The boiler must not be installed in a room or internal space below ground level, e.g. in a basement or cellar, except where at
least one side is open to ground level.
CD12/20/25/28 LPG Supplement
3
Page 4
4 INST ALLATION
In addition to the regulations and requirements stated in the Installation and Servicing instructions, the boiler must be installed
in accordance with BS 5482:1 - The Installation of Propane Burning Appliances in Permanent Dwellings.
5 COMMISSIONING
The boiler has been tested and factory set for use with Propane gas and it should only be necessary to ensure the correct gas
supply pressure of 37 mbar is available.
6 P ARTS LIST
Only the main burner injectors are special to Propane boilers. For other 'Short List Spare Parts', refer to the Installation and
Servicing instructions supplied with the boiler.
Propane components
Main burner injector - CD12S
Main burner injector - CD20S
Main burner injector - CD28S
Main burner injector - CD25X
Main burner injector - CD28X
Qty.
1
1
1
1
1
Type
2.75 mm
3.20 mm
4.20 mm
4.0 mm
3.85 mm
Alpha Part No.
1.025663
1.025664
1.024872
1.022509
1.024176
7 SERVICING
When servicing or replacing boiler components follow the procedures as described in the main Installation and Servicing
instructions supplied with the boiler.
Remembering the parts special for Propane boilers and the burner pressures special to Propane boilers given in this leaflet.
DETAILS OF BOILER INSTALLATION
Date of Installation: ......................................................................
Name of Installer: ........................................................................
Address: ......................................................................................
....................................................................................................
....................................................................................................
Postcode: ....................................................................................
Telephone No: .............................................................................
Boiler Serial Number: (LPG) ........................................................ (see inside controls panel hinged cover)
Alpha Therm Limited.
Nepicar House, London Road, Wrotham Heath,
Sevenoaks, Kent TN15 7RS
Tel: 0870 3001964
email: [email protected]
website: www.alpha-innovation.co.uk
Leaflet compiled and designed by Publications 2000 - Tel: (01670) 356211 11/08/D232
These instructions have been carefully prepared but we reserve the right to
alter the specification at any time in the interest of product improvement.
© Alpha Therm Limited 2008.
Part No. 1.025634
Loading...