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Installation and Servicing
Instructions
Alpha CB50
Wall Mounted, Fan Assisted, Room Sealed, Gas Fired
Combination Boiler with Unvented Hot Water Storage
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: (01322) 669443
Goldsel Road,
Swanley, Kent BR8 8EX
Fax: (01322) 615017
British Gas G.C. No. 47 532 18
For use with Natural Gas only
Leave these instructions with the User
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CONTENTS
1
Introduction ....................................... 2
7
Routine servicing ............................... 20
2
Technical data ................................... 3
8
Component replacement ................... 22
3
General boiler information .................. 6
9
Wiring diagrams ................................ 29
4
Installation ......................................... 12
10
Short parts list ................................... 31
5
Commissioning ................................. 17
11
Service history .................................. 32
6
Boiler operation ................................. 19
1
INTRODUCTION
The Alpha CB50 boiler is a wall mounted, fan assisted room-sealed combination boiler, incorporating a 57 litre unvented hot
water storage cylinder. Heat output is controlled by a modulating gas valve, with fully automatic direct burner ignition.
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 Natural Gas .
The boiler is supplied with a pump, diverter valve, pressure relief valve, expansion vessel and pressure gauge fully assembled
and tested.
As supplied, the boiler will automatically modulate to provide central heating outputs between 10.5 and 28.0 kW (35 800 and
95 550 Btu/h).
The maximum output available for domestic hot water is 28.0 kW (95 550 Btu/h) and provides hot water at temperatures of up
to 65°C and flow rates of up to 20 litres/min (4.4 gal/min).
IMPORTANT
This boiler has been approved to the Building Regulations for unvented hot water storage systems and the Local Authority
must be notified of the intention to install. Therefore the installation must be carried out by a person competent to install
unvented hot water systems.
It is the law that all gas appliances are installed by a competent person, ie CORGI registered personnel, in accordance with
the following recommendations:-
Gas Safety (Installation and Use) Regulations 1984 (as amended)
All relevant Building Regulations issued by the Department of the Environment
Building Standards (Scotland) (Consolidation) Regulations issued by the Scottish Development Department
Local Water Bye Laws
Health & Safety Document No. 635 (The Electricity At Work Regulations 1989)
The installation should also be in accordance with the following British Standard Codes of Practice:-
BS 5440:1:2000 Flues
BS 5449:1990 Forced circulation hot water systems
BS 5546:2000 Installation of hot water supplies for domestic purposes
BS 6700:1997 Design, installation, testing and maintenance of services supplying water
BS 6798:2000 Installation of gas fired hot water boilers
BS 6891:1998 Gas installation
BS 7593:1992 Code of Practice for treatment of water in heating systems
BS 7671:2001 Requirements for electrical installations, IEE Wiring Regulations
If installation is in a timber framed building, refer to the Institute of Gas Engineers document IGE/UP/7.
This appliance meets the requirements of IPX4D, ie degree of protection against moisture.
Failure to install this appliance correctly could lead to prosecution. It is in your own interest and that of safety to ensure that the
law is complied with.
Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
Note: Ensure that the Benchmark Log Book has been completed after the boiler has been installed and commissioned.
Notes: 1. Prior to installation ensure the appliance is stored upright in dry conditions and is transported in an upright position.
2. Ensure the appliance has been supplied with the unvented package and flue system.
2
Alpha CB50 - Contents/Introduction
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2
TECHNICAL DATA
2.1
PERFORMANCE - NATURAL GAS (Cat I 2H )
Central Heating
Heat Input
MAX.
33.6
114 700
28.0
95 550
10.0
4.0
3.25
114.8
82
180
MIN.
13.5
46 200
10.5
35 800
1.7
0.68
1.24
43.9
30
86
Domestic Hot Water
Heat Input
MAX.
33.6
114 700
28.0
95 550
10.0
4.0
3.25
114.8
18.0
4.0
65
149
MIN.
13.5
46 200
10.5
35 800
1.7
0.68
1.24
43.9
1.0
0.22
5
41
kW
kW
(Gross)
Btu/h
(Gross)
Btu/h
Heat Output (modulating)
kW
Btu/h
Output to Water (modulating)
kW
Btu/h
Burner Pressure
mbar
mbar
Burner Pressure
Room sealed chamber
panel fitted
Room sealed chamber
panel fitted
in wg
in wg
Setting
Setting
Gas Rate
m³/h
ft³/h
Gas Rate
m³/h
ft³/h
CH Water Temp. (Approx.)
°C
°F
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
8.0 minutes
3.5 minutes
5.0 minutes
(boiler ON)
(boiler OFF)
2.2
SYSTEM
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)
Domestic Hot Water
Max. Hot Water Working Pressure
Max. Mains Inlet Pressure (inlet of pressure reducing valve)
Min. Mains Water Pressure
Mains Inlet Connection
DHW Outlet Connection
DHW Water Storage
Expansion Vessel Size (pre-charge press.)
Pressure Reducing Valve Setting
Temperature and Pressure Relief Valve
Expansion Relief Valve Setting
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
5.5 bar
12 bar
0.1 bar
15 mm
15 mm
57 L
4L at 2.5 bar
2.5 bar
90°C/7 bar
6 bar
2.3
COMPONENTS
2.4
INSTALLATION
Burner (15 blade)
Main Heat exchanger
DHW Storage Cylinder
Main Burner Injectors
Flue - Outer Duct
Flue - Inner Duct
Stainless steel
Copper
Stainless Steel
1.3 mm (15 off)
Epoxy coated
Aluminium
Minimum Clearances for Servicing
Top
Bottom
Sides
Front
220 mm
250 mm
10 mm
450 mm
100 mm Dia.
130 mm
110 mm Dia.
72 kg
132 kg
Flue Terminal Size
Flue Terminal Protruding
Hole Size Required For Flue Assy.
Lift Weight
Weight Full and Operational
2.5
GENERAL
2.6
ELECTRICAL
Dimensions
Height
Width
Depth
900 mm
600 mm
450 mm
22 mm
3.2 L
100 mm
60 mm
Supply
External Fuse
Power Consumption
Internal Fuse
Electrode Spark Gap
230/240 V ~ 50 Hz
3 A
190 W
F2 A
2.0 to 4.0 mm
Gas Connection
Primary Water Content
Air Duct Diameter
Flue Duct Diameter
Alpha CB50 - Technical Data
3
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2.7 FLUE LENGTHS
Flue length = 0.75 m (not including the terminal, which is supplied with the boiler)
Note: Additional flues (of the same length) are available.
Length of Flue Required:-
Rear Flue = wall thickness +195 mm
Side Flue = wall thickness + distance between wall and side of boiler + X mm (L/H side X = 140, R/H side X = 380)
Vertical Flue = distance from top of boiler side panel to required roof position minus 1 m for vertical terminal assembly
Maximum flue length = 4 m horizontal or 4 m vertical.
Each additional 90° Bend is equivalent to 1 m of flue length.
Each 45° Bend is equivalent to 0.5 m of flue length.
The Vertical Flue terminal assembly is equivalent to 1 m of flue length.
2.8
AVAILABLE PUMP HEAD FOR CENTRAL HEATING
Output
Available pump head
Flow rate
Pressure loss across boiler
kW
Btu/h
17°C
20°C
17°C
20°C
17°C
20°C
metres
2.1
feet
6.9
litre/min
gal/min
litre/min
gal/min
metres
3.5
feet
11.5
metres
2.7
feet
8.9
5.9
metres
1.0
2.2
3.6
feet
3.28
7.22
11.8
21.7
18.3
14.82
12.35
4.8
4.0
3.27
2.73
18.4
15.2
12.60
10.50
4.1
3.4
2.78
2.32
28.00
23.44
17.58
95563
80 000
60 000
3.4
4.2
4.6
11.1
13.7
15.1
2.6
1.6
1.2
8.5
5.2
3.9
1.8
1.2
1.0
3.9
3.3
2.3
2.0
14.65
11.72
10.40
50 000
40 000
35 495
4.2
4.8
5.0
13.7
15.7
16.4
5.1
5.3
16.7
17.3
9.88
8.77
2.18
1.94
8.40
7.45
1.86
1.65
0.9
0.8
2.9
2.6
0.7
0.6
This information is based on 17°C and 20°C system design temperature difference.
2.9 ELECTRICAL CONNECTIONS
Note: This Appliance Must Be Earthed
An optional integral Clock kit is available if required.
Not
Used
Red
Wire
Red
Wire
Brown
Wire
Blue
Wire
5
4
3
2
1
Internal Clock Terminals
WARNING
1. Ensure wires are connected
correctly
2. Only fit the Alpha recommended
clock. Other clocks could cause
damage.
Clock connections
Boiler terminal block
Fig. 1
4
Alpha CB50 - Technical Data
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2.10
BOILER SCHEMATIC
1.
Gas Service Cock
19.
Room Sealed Chamber
2.
Heating On/Off Valve
20.
CH Expansion Vessel
3.
Gas Valve
21.
Storage Cylinder
4.
Pressure Gauge
22.
Temperature/Pressure Relief Valve
5.
Pump and Air Separator
23.
Hot Water Storage Temperature Sensor
6.
Primary Drain Valve
24.
Secondary Heat Exchanger
7.
Primary Low Pressure Warning Switch
25.
DHW Expansion Vessel
8.
By-Pass
26.
Check Valve
9.
Automatic Flow Regulator with Filter
27.
Pressure Reducing Valve with Filter
10.
3-Port Diverter Valve
28.
Tundish
11.
Primary Flow Temperature Sensor
29.
Ignition Electrodes
12.
Overheat Thermostat
30.
Flame Sensing Electrode
13.
C.H. Pressure Relief Valve
31.
Flue Adapter
14.
Automatic Air Vent
32.
Flue Sample Point
15.
Main Burner
33.
Expansion Relief Valve
16.
Main Heat Exchanger
34.
Mains Inlet Valve
17.
Fan
35.
DHW Drain Point
18.
Air pressure Switch
36.
Automatic Flow Regulator Thermostat
Fig. 2
Alpha CB50 - Technical Data
5
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