Technical data
4
Alpha C23/27 - Technical Data
Fig. 1
720 mm
450 mm
330 mm
22 mm
1.6 L
1.8 L
100 mm
60 mm
Case Dimensions Height
(without bottom tray) Width
Depth
Gas Connection
Primary Water Content C23
C27
Air Duct Diameter
Flue Duct Diameter
2.5 GENERAL 2.6 ELECTRICAL
Supply
External Fuse
Power Consumption
Internal Fuse
Ignition Electrode Spark Gap
Flame Sensing Electrode Gap
230/240 V ~ 50 Hz
3 A
170 W
F2 A
3 mm
6 mm
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 + 175mm
Side Flue = wall thickness + distance between wall and side of boiler + 185 mm
Vertical Flue = distance from top of boiler side panel to required roof position minus 1 m for vertical terminal assembly
Maximum flue length = 3 m Horizontal, 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
gal/min
3.7
2.8
2.3
1.8
1.5
Btu/h
79 500
60 000
50 000
40 000
31 700
kW
23.3
17.58
14.65
11.63
9.3
metres
1.4
2.8
3.5
4.1
4.95
feet
4.6
9.2
11.5
13.5
14.6
Output Available pump head
metres
2.2
3.4
3.8
4.35
4.65
feet
7.2
11.2
12.5
14.3
15.26
metres
2.5
1.9
1.25
0.8
0.5
feet
8.2
6.2
4.1
2.6
1.6
metres
2.3
1.3
0.95
0.65
0.4
feet
7.5
4.3
3.1
2.1
1.3
Pressure loss across boiler
gal/min
4.3
3.3
2.7
2.2
1.7
litre/min
16.7
12.6
10.5
8.3
6.7
17°C 20°C
litre/min
19.6
14.8
12.3
9.8
7.8
17°C 20°C 17°C 20°C
Flow rate
This information is based on 17°C and 20°C system design temperature difference.
Note: For outputs upto 28 kW refer to section 3.7.
Boiler terminal block
1. Ensure wires are connected
correctly
2. Only fit the Alpha recommended
clock. Other clocks could cause
damage.
WARNING
Blue
Wire
Brown
Wire
Red
Wire
12345
Internal Clock Terminals
Red
Wire
Not
Used
Clock connections
2.9 ELECTRICAL CONNECTIONS
Note: This Appliance Must Be Earthed
An optional integral Clock kit is available if required.