2
CD50 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 CD50 is a wall mounted, high efficiency, fan assisted, room-sealed, condensing combination boiler - incorporating a
52 litre unvented hot water storage cylinder. The burner is lit electronically and heat output is controlled by a modulating gas
valve and fan.
The boiler, providing both central heating and domestic hot water at mains pressure, is designed for use with a fully pumped,
sealed and pressurised heating system using only PROPANE gas.
2 TECHNICAL DATA
2.1 PERFORMANCE - PROPANE GAS (CAT 3P-G31-37 mbar)
37.0
14.8
7 minutes
3 minutes
5 minutes
MIN.
7.4
25 360
6.6
22 830
6.3
21 500
0.24
0.1
0.26
9.3
1.0
0.22
5
41
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 L/min
G.P.M.
Outlet Water Temp. (Approx.) °C
°F
Time to raise water store by 50°C
Reheat time for 70% of store
(boiler ON)
(boiler OFF)
Room sealed
chamber panel
fitted
MAX.
36.1
123 190
32.6
110 910
32.0
109 200
5.9
2.36
1.25
44.6
18.0
4.0
65
149
37.0
14.8
82
180
MAX.
31.0
105 770
28.0
95 230
29.7
101 430
27.6
94 130
4.16
1.66
1.08
38.6
MIN.
7.4
25 360
6.6
22 830
7.0
23 980
6.5
21 500
0.24
0.10
0.26
9.3
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
CH Water Temp. (Approx. max.) °C
°F
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