Technical data
3
2.1 PERFORMANCE - NATURAL GAS
2 TECHNICAL DATA
Alpha C23/27 - Technical Data
Min. Clearances for Servicing Top
(from casing) Bottom
Sides
Front
Flue Terminal Size
Flue Terminal Protruding
Hole Size Required For Flue Assy.
Lift Weight C23
C27
2.4 INSTALLATION
220 mm
250 mm
5 mm
450 mm
100 mm Dia.
145 mm
110 mm Dia.
36 kg
37 kg
MAX.
28.5
97 200
23.3
79 500
10.9
4.36
2.71
95.70
MIN.
12.3
42 000
9.3
31 700
2.3
0.9
1.16
40.96
Room sealed chamber
panel fitted
Central Heating
Heat Input kW
(Gross) Btu/h
Heat Output (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Rate m³/h
ft³/h
MAX.
33.0
112 600
27.0
92 100
11.3
4.52
3.14
110.9
MIN.
14.3
48 800
11.0
37 500
2.15
0.9
1.37
48.38
Room sealed chamber
panel fitted
Central Heating
Heat Input kW
(Gross) Btu/h
Heat Output (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Rate m³/h
ft³/h
MAX.
28.5
97 200
23.3
79 500
10.9
4.36
2.71
95.70
9.5
2.1
MIN.
12.3
42 000
9.3
31 700
2.3
0.9
1.16
40.96
Domestic Hot Water
Heat Input kW
(Gross) Btu/h
Output to Water (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Rate m³/h
ft³/h
Flow Rate at 35°C Rise L/min
G.P.M.
Room sealed chamber
panel fitted
MAX.
33.0
112 600
27.0
92 100
11.3
4.52
3.14
110.9
11.0
2.42
MIN.
14.3
48 800
8.1
27 600
1.21
0.48
1.03
36.4
Domestic Hot Water
Heat Input kW
(Gross) Btu/h
Output to Water (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Rate m³/h
ft³/h
Flow Rate at 35°C Rise L/min
G.P.M.
Room sealed chamber
panel fitted
Burner
Main CH/DHW Heat Exchanger
Main Burner Injectors C23
C27
Flue - Outer Duct
Flue - Inner Duct
Stainless steel
Copper
1.30 mm (x12)
1.30 mm (x14)
White
Aluminium
2.3 COMPONENTS
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)
Domestic Hot Water
Max. Mains Inlet Water Pressure
Min. Mains Water Pressure
Min. DHW Flow Rate
Mains Inlet Connection
DHW Outlet Connection
DHW Water Content C23
C27
Outlet Water Temp. (Approx. max.)
8 bar
0.2 bar
2.5 l/min
15 mm
15 mm
0.2 L
0.24 L
62°C (144°F)
2.2 SYSTEM
Alpha C23 Alpha C27
Alpha C23 Alpha C27