Supplementary LPG Boiler
Instructions
Alpha CD25C/28C/35C
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 CD25C British Gas G.C. No. 47 532 32
0051
Alpha CD28C British Gas G.C. No. 47 532 34
Alpha CD35C British Gas G.C. No. 47 532 36
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 CD25C, CD28C and CD35C are combination boilers providing both central heating and domestic hot water at
mains pressure.
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)
Alpah CD25C
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
66 550
18.0
61 420
3.15
1.26
0.78
27.6
21 800
19 780
20 820
18 780
37.0
14.8
MIN.
6.4
5.8
6.1
5.5
0.4
0.16
0.24
8.5
Alpha CD25C
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 CD28C Alpha CD28C
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.
27.1
92 400
24.4
83 250
25.9
88 400
24.0
81 900
7.27
2.9
1.04
36.7
MIN.
24 900
22 500
23 500
21 500
0.64
0.26
37.0
14.8
0.28
7.3
6.6
6.9
6.3
9.8
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
26.7
91 100
21 960
24.1
82 200
19 780
24.3
Room sealed
chamber panel
fitted
84 800
6.10
2.44
18 780
37.0
in wg
14.8
1.02
ft³/h
36
9.6
gal/min
2.2
11.2
2.5
MAX.
)kW
s
31.6
107 900
24 900
28.5
97 200
22 500
28.7
Room sealed
chamber panel
fitted
97 900
9.06
3.62
21 500
37.0
in wg
14.8
1.21
ft³/h
42.7
11.4
gal/min
2.5
13.3
2.9
MIN.
6.4
5.8
5.5
0.40
0.16
0.24
8.5
MIN.
7.3
6.6
6.3
0.64
0.26
0.28
9.8
CD25C/28C/35C LPG Supplement
2
Alpha CD35C
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.
31.6
107 800
28.5
97 200
30.3
103 400
28.0
95 550
2.49
1.0
1.21
42.7
30 600
27 600
29 000
26 600
37.0
14.8
%CO2 content (± 0.2%) Sedbuk rating
Boiler model
CD25C
CD28C
CD35C
LPG (propane) Efficiency
Min
10.0
10.1
9.1
CH Max
10.7
10.6
10.7
DHW max
10.6
10.6
10.8
MIN.
8.9
8.1
8.5
7.8
0.23
0.09
0.34
12.0
Alpha CD35C
Domestic Hot Water
Heat Input (H
)kW
s
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Output to Water (Hs)kW
(modulating) 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
Flow Rate at 35°C Rise L/min
gal/min
Specific Flow Rate (D) at 30°C Rise L/min
(Flow rate @ 30K to EN625) gal/min
band
A
A
A
SAP efficiency
(%)
91.9
91.6
92.4
NOx class
5
5
5
MAX.
38.0
129 600
34.3
117 000
34.6
118 100
3.43
1.37
1.46
51.5
MIN.
8.9
30 600
8.1
27 600
8.0
27 300
0.23
0.09
37.0
14.8
0.34
12.0
14.2
3.13
15.6
3.44
2.3 GAS SUPPLY
The Alpha CD25C boiler requires a gas rate of 1.87 kg/h (4.0 lb/h) or 3.6 litres/h of liquid gas.
The Alpha CD28C boiler requires a gas rate of 2.22 kg/h (4.8 lb/h) or 4.2 litres/h of liquid gas.
The Alpha CD35C boiler requires a gas rate of 2.67 kg/h (5.7 lb/h) or 5.0 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.
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.
CD25C/28C/35C LPG Supplement
3
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 - CD25C and 28C
Main burner injector - CD35C
Qty.
1
1
Type
4.0 mm
5.4 mm
Alpha Part No.
1.022509
1.024388
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: info@alphatherm.co.uk
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. 1.024987
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