Alpha Alpha CD50 User manual

Supplementary LPG Boiler
Instructions
Alpha CD50
Wall Mounted, Fan Assisted, Room Sealed, Gas Fired,
High Efficiency, Condensing Combination Boiler with
Unvented Hot Water Storage
Alpha CD50 G.C. No. 47 532 24
British Gas
Service Listed
For use with LPG (Propane) only
Leave these instructions with the User
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
For Technical help or for Service call ...
ALPHA HELPLINE Tel: [phone]
website:www.alpha-innovation.co.uk

2CD50 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 TECHNICALDATA
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 (Hs)kW
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Output to Water (Hs)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 (Hs)kW
(Gross) Btu/h
Heat Input (Hi)kW
(Net) Btu/h
Heat Output (Hscondensing) kW
(50°C/30°C) Btu/h
Heat Output (Hinon-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

3
CD50 LPG Supplement
3 BOILER LOCATION
The boiler must not be installed in a room or internal space below ground level, e.g. in a basement or cellar, except where at
least one side is open to ground level.
4 INSTALLATION
In addition to the regulations and requirements stated in the Installation and Servicing instructions, the boiler must be installed
in accordance with BS 5482:1 - The Installation of Propane Burning Appliances in Permanent Dwellings.
5 COMMISSIONING
6 PARTS LIST
Only the main burner injectors are special to Propane boilers. For other 'Short List Spare Parts', refer to the Installation and
Servicing instructions supplied with the boiler.
Propane components
Main burner injector Qty. 1Type 4.55 mm Alpha Part No. 1.018202
The boiler has been tested and factory set for use with Propane gas and it should only be necessary to ensure the correct gas
supply pressure of 37 mbar is available.
2.2 GAS SUPPLY
The Alpha CD50 boiler requires a gas rate of 2.5 kg/h (5.5 lb/h) or 4.8 litres/h of liquid gas.
The supply pipes must be capable of delivering this quantity of gas in addition to the demand from any other appliances in the
house. The boiler requires at least a 22 mm gas supply pipe.
The complete installation must be tested for gas soundness against leakage.
The local Propane gas supplier should be consulted, at the installation planning stage, in order to establish the availability of an
adequate supply of gas.
Installation pipes, cylinders and pressure regulators should be fitted in accordance with BS 5482:1. Bulk tank installation must
comply with the requirements of the Home Office code of practice for the storage of liquefied petroleum gas at fixed installations.
7 SERVICING
When servicing or replacing boiler components follow the procedures as described in the main Installation and Servicing
instructions supplied with the boiler.
Remembering the parts special for Propane boilers and the burner pressures special to Propane boilers given in this leaflet.

DETAILS OF BOILER INSTALLATION
Date of Installation: ......................................................................
Name of Installer: ........................................................................
Address: ......................................................................................
....................................................................................................
....................................................................................................
....................................................................................................
Postcode: ....................................................................................
Telephone No: .............................................................................
Boiler Serial Number: (LPG) ........................................................
(see inside controls panel hinged cover)
Leaflet compiled and designed by Publications 2000 - Tel: [phone]/D229
Part No. 1.021350
These instructions have been carefully prepared but we reserve the right to
alter the specification at any time in the interest of product improvement.
© Alpha Therm Limited 2008.
Alpha Therm Limited.
NepicarHouse,LondonRoad,WrothamHeath,
Sevenoaks, Kent TN15 7RS
Tel: [phone]
email: [email protected]
website:www.alpha-innovation.co.uk