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2
TECHNICAL DATA
2.1
PERFORMANCE - NATURAL GAS (CAT: I2H 2H - G20 - 20 mbar)
Alpha CD18S
Central Heating
Heat Input (H
)
s
(Gross)
Heat Input (H
)
i
(Net)
Heat Output (H
condensing)
s
(50°C/30°C)
Heat Output (H
non-condensing) kW
i
(80°C/60°C)
Differential Burner
Room sealed
chamber panel
Pressure
fitted
Gas Rate
Alpha CD30S
Central Heating
Heat Input (H
)
s
(Gross)
Heat Input (H
)
i
(Net)
Heat Output (H
condensing)
s
(50°C/30°C)
Heat Output (H
non-condensing) kW
i
(80°C/60°C)
Differential Burner
Room sealed
chamber panel
Pressure
fitted
Gas Rate
2.2
SYSTEM
Alpha CDS models
Central Heating (Sealed System)
Max. Working System Pressure
Min. System Pressure
Max. System temperature
Pressure Relief Valve Setting
Expansion Vessel Size (pre-charge press.)
Flow Connection
Return Connection
Relief Valve Connection
Recommended System Pressure (cold)
CH Water Temp. (Approx. max.)
MAX.
MIN.
kW
20.3
5.5
Btu/h
69 200
18 800
kW
18.3
5.0
Btu/h
62 400
17 000
kW
19.5
5.3
Btu/h
66 500
18 100
18.1
4.7
Btu/h
61 800
16 050
mbar
3.5
0.3
in wg
1.4
0.12
m³/h
1.93
0.52
ft³/h
68.2
18.36
MAX.
MIN.
kW
31.1
7.3
Btu/h
106 100
24 900
kW
28.0
6.6
Btu/h
95 550
22 500
kW
29.8
7.0
Btu/h
101 700
23 900
28.0
6.5
Btu/h
95 500
22 200
mbar
3.33
0.39
in wg
1.33
0.16
m³/h
2.98
0.69
ft³/h
105.2
24.4
2.5 bar
0.5 bar
82°C
3 bar (44 PSI)
8 L at 0.8 bar
22 mm
22 mm
15 mm
1.0 bar
82°C (180°F)
Alpha CD24S
Central Heating
Heat Input (H
)
s
(Gross)
Heat Input (H
)
i
(Net)
Heat Output (H
condensing)
s
(50°C/30°C)
Heat Output (H
non-condensing) kW
i
(80°C/60°C)
Differential Burner
Room sealed
chamber panel
Pressure
fitted
Gas Rate
2.3
COMPONENTS
Burner
Main Heat exchanger
Main Burner Injector
Flue - Outer Duct
Flue - Inner Duct
2.4
ELECTRICAL
Supply
External Fuse
Power Consumption
Internal Fuse
Electrode Spark Gap
Alpha CD18S/24S/30S - Technical Data
MAX.
MIN.
kW
26.4
Btu/h
90 100
18 800
kW
24.0
Btu/h
82 000
17 100
kW
25.4
Btu/h
86 700
18 100
23.5
Btu/h
81 135
16 050
mbar
5.78
0.35
in wg
2.30
0.14
m³/h
2.54
0.53
ft³/h
89.7
18.7
Stainless steel
Stainless steel
CD18/24
5.0 mm
CD30
6.6 mm
White
Plastic
230/240 V ~ 50 Hz
3 A
CD18/24
130 W
CD30
140 W
F2 A
3 - 4 mm
5.5
5.0
5.3
4.7
3
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