Alpha CD25C, CD28C, CD35C Instruction
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
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