Alpha CD12S - Technical Data

4
CH Max
9.4
9.4
9.4
720 mm
440 mm
300 mm
345 mm
15 mm
22 mm
1.5 L
1.8 L
2.5 L
100 mm
60 mm
Case Dimensions Height
Width
Depth
Depth (with Jig)
Gas Connection CD12S/CD20S
CD28S
Primary Water Content CD12S
CD20S
CD28S
Air Duct Diameter
Flue Duct Diameter
2.6 GENERAL
Min. Clearances for Servicing Top
(from casing) Bottom
Sides
Front
Flue Terminal Size
Flue Terminal Protruding
Hole Size Required For Flue Assy.
Lift Weight CD12S
CD20S
CD28S
2.5 INSTALLATION
235 mm
250 mm
5 mm
450 mm
100 mm Dia.
90 mm
110 mm Dia.
37 kg
38 kg
40 kg
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)
CH Water Temp. (Approx. max.)
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
82°C (180°F)
2.2 SYSTEM
Burner
Main Heat exchanger
DHW Heat Exchanger
Main Burner Injector CD12S
CD20S
CD28S
Flue - Outer Duct
Flue - Inner Duct
Stainless steel
Stainless steel
Stainless Steel
3.5 mm
4.2 mm
5.4 mm
White
Plastic
2.3 COMPONENTS 2.4 ELECTRICAL
Supply
External Fuse
Power Consumption
Internal Fuse - Main Terminal
PCB Fuse F1
PCB Fuse F2 and F3
Electrode Spark Gap
Electrical Enclosure Degree of Moisture Protection
230/240 V ~ 50 Hz
3 A
120 W
F2 A
315 mAT
2.5 AF
3 - 4 mm
IPX4D
Alpha CD12S/20S/28S - Technical Data
2.7 PERFORMANCE DATA
%CO
2
content (± 0.2%) Sedbuk rating
Natural Gas Efficiency
band
A
A
A
SAP efficiency
(%)
90.1
90.1
90.1
Min
8.9
8.9
9.1
NOx class
5
5
5
Boiler model
CD12S
CD20S
CD28S
Note: The differential burner pressure and the combustion performance value of %CO
2
content have been factory preset and
do not require adjusting.