Alpha CD28C - Description and Boiler Specifications; Boiler Types and Capacities

2
CD25C/28C/35C LPG Supplement
37.0
14.8
11.4
2.5
13.3
2.9
37.0
14.8
37.0
14.8
9.6
2.2
11.2
2.5
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 DATA
PERFORMANCE - PROPANE GAS (CAT I3P 3P - G31 - 37 mbar)
Alpha CD28C Alpha CD28C
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.
7.3
24 900
6.6
22 500
6.9
23 500
6.3
21 500
0.64
0.26
0.28
9.8
Room sealed
chamber panel
fitted
Central Heating
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Heat Output (H
s
condensing) kW
(50°C/30°C) Btu/h
Heat Output (H
i
non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
MAX.
31.6
107 900
28.5
97 200
28.7
97 900
9.06
3.62
1.21
42.7
MIN.
7.3
24 900
6.6
22 500
6.3
21 500
0.64
0.26
0.28
9.8
Domestic Hot Water
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Output to Water (H
s
)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
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
Room sealed
chamber panel
fitted
37.0
14.8
Alpah CD25C
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
MIN.
6.4
21 800
5.8
19 780
6.1
20 820
5.5
18 780
0.4
0.16
0.24
8.5
Room sealed
chamber panel
fitted
Central Heating
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Heat Output (H
s
condensing) kW
(50°C/30°C) Btu/h
Heat Output (H
i
non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
Alpha CD25C
MAX.
26.7
91 100
24.1
82 200
24.3
84 800
6.10
2.44
1.02
36
MIN.
6.4
21 960
5.8
19 780
5.5
18 780
0.40
0.16
0.24
8.5
Domestic Hot Water
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Output to Water (H
s
)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
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
Room sealed
chamber panel
fitted