2
CD18/24/30/32 LPG Supplement
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 CD24C and CD32C are combination boilers providing both central heating and domestic hot water at mains
pressure. The CD18S, CD24S and CD30S are System boilers providing heating only for sealed central heating systems.
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 CD24C and CD24S
Alpha CD24C
MAX.
26.4
90 100
24.0
82 000
25.4
86 700
23.5
81 135
6.7
2.7
1.03
36.6
MIN.
5.5
18 800
5.0
17 100
5.3
18 100
4.7
16 018
0.4
0.16
0.42
15.1
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.
26.4
90 100
24.0
82 000
24.20
82 600
6.7
2.7
1.03
36.6
MIN.
5.5
18 800
5.0
17 100
4.97
17 000
0.4
0.16
0.42
15.1
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
37.0
14.8
9.6
2.2
11.2
2.5
37.0
14.8
Alpah CD18S
MAX.
20.3
69 200
18.3
62 400
19.5
66 500
18.1
61 800
3.9
1.56
0.71
25.1
MIN.
5.5
18 800
5.0
17 000
5.3
18 100
4.7
16 050
0.35
0.14
0.26
9.2
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
