Alpha CD28C - Boiler Safety and Operation Indicators; Indicator Neons; Overheat Thermostat; Pressure Relief Valve

3
2.1 PERFORMANCE - NATURAL GAS (CAT: I2H 2H - G20 - 20 mbar)
2 TECHNICAL DATA
Alpha CD25C/28C/35C - Technical Data
Alpha CD25C
MAX.
20.4
69 600
18.4
62 780
19.5
66 550
18.0
61 420
2.82
1.13
1.94
68.5
MIN.
6.4
21 960
5.8
19 780
6.1
20 820
5.5
18 780
0.40
0.16
0.61
21.5
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 Rate m³/h
ft³/h
9.6
2.2
11.2
2.5
MAX.
26.7
91 100
24.1
82 200
24.3
84 800
5.49
2.20
2.55
90.0
MIN.
6.4
21 960
5.8
19 780
5.5
18 780
0.40
0.16
0.61
21.5
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 Rate 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
Alpha CD25C
MAX.
27.1
92 400
24.4
83 250
25.9
88 400
24.0
81 900
5.73
2.29
2.59
91.4
MIN.
7.3
24 900
6.6
21 500
6.9
23 500
6.3
21 500
0.52
0.21
0.70
24.7
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 Rate m³/h
ft³/h
Alpha CD28C
11.4
2.5
13.3
2.9
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 Rate 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
Alpha CD28C
MIN.
7.3
24 900
6.6
22 500
6.3
21 500
0.52
0.21
0.70
24.7
MAX.
31.6
107 900
28.5
97 200
28.7
97 900
7.47
2.98
3.02
106.6
MAX.
31.6
107 800
28.5
97 200
30.3
103 400
28.0
95 550
2.01
0.80
3.02
106.6
MIN.
8.9
30 600
8.1
27 600
8.5
29 000
7.8
26 600
0.25
0.10
0.86
30.4
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 Rate m³/h
ft³/h
Alpha CD35C
14.2
3.13
15.6
3.44
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 Rate 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
Alpha CD35C
MIN.
8.9
30 600
8.1
27 600
8.0
27 300
0.25
0.10
0.86
30.4
MAX.
38.0
129 600
34.3
117 000
34.6
118 100
3.07
1.23
3.64
128.5
Note: The above appliances are fully modulating and are not range rated.