Alpha CD50 Instruction

Supplementary LPG Boiler

Instructions

Alpha CD50

Wall Mounted, Fan Assisted, Room Sealed, Gas Fired,

High Efficiency, Condensing Combination Boiler with

Unvented Hot Water Storage

For Technical help or for Service call ...

ALPHA HELPLINE Tel: [phone]

website:www.alpha-innovation.co.uk

Nepicar House, London Road,

Wrotham Heath, Sevenoaks,

Kent TN15 7RS

British Gas

Service Listed

Alpha CD50 G.C. No. 47 532 24

For use with LPG (Propane) only

Leave these instructions with the User

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 DA T A

2.1 PERFORMANCE - PROPANE GAS (CAT 3P-G31-37 mbar)

Central Heating

Heat Input (H

)kW

s

(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Heat Output (Hs condensing) kW
(50°C/30°C) Btu/h
Heat Output (Hi non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg

Room sealed
chamber panel
fitted

MAX.

31.0

105 770

28.0

95 230

29.7

101 430

27.6

94 130

4.16

1.66

Gas Supply Pressure (LPG) mbar

in wg

Gas Rate (LPG) m³/h

ft³/h

1.08

38.6

CH Water Temp. (Approx. max.) °C

°F

Domestic Hot Water

Heat Input (H

)kW

s

(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Output to Water (Hs)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg

Room sealed
chamber panel
fitted

MAX.

36.1

123 190

32.6

110 910

32.0

109 200

5.9

2.36

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

1.25

44.6

18.0

4.0
65

149
Time to raise water store by 50°C
Reheat time for 70% of store

(boiler ON)
(boiler OFF)

MIN.

25 360

22 830

23 980

21 500

0.24

0.10

37.0

14.8

0.26

82

180

MIN.

25 360

22 830

21 500

0.24

37.0

14.8

0.26

0.22

7 minutes
3 minutes
5 minutes

7.4

6.6

7.0

6.5

9.3

7.4

6.6

6.3

0.1

9.3

1.0

5

41

CD50 LPG Supplement

2