Alpha CB28 - User Controls Overview; Boiler Controls and Functions; Central Heating Thermostat; Domestic Hot Water Thermostat

2
CB24/28 and SY24 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 CB24/28 range of combination boilers are wall mounted, fan assisted room-sealed combination boilers providing
both central heating and domestic hot water at mains pressure.
The Alpha SY9-24 is a System boiler providing heating only, for sealed central heating systems.
The boilers are designed for use with a fully pumped sealed and pressurised heating system using only PROPANE gas.
2 TECHNICAL DATA
2.1 PERFORMANCE - PROPANE GAS
MAX.
28.4
96 900
23.3
79 500
35.5
14.2
1.1
39.1
MIN.
12.1
41 300
9.3
31 700
7.2
2.9
0.45
16.1
MAX.
28.4
96 900
23.3
79 500
35.5
14.2
1.1
39.1
MIN.
12.1
41 300
9.3
31 700
7.2
2.9
0.45
16.1
Room sealed chamber
panel fitted
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 Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
CH Water Temp. (Approx. max.) °C
°F
37.0
14.8
82
180
37.0
14.8
9.5
2.1
62
144
Domestic Hot Water
Heat Input kW
(Gross) Btu/h
Output to Water (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
Flow Rate at 35°C Rise L/min
G.P.M.
Outlet Water Temp. (Approx. max.) °C
°F
2.2 PERFORMANCE - PROPANE GAS
MAX.
34.0
116 000
28.0
95 500
36.0
14.4
1.3
47.1
MIN.
14.3
48 800
11.2
38 200
7.5
3.0
0.45
16.1
MAX.
34.0
116 000
28.0
95 5000
36.0
14.4
1.3
47.1
MIN.
14.3
48 800
11.2
38 200
7.5
3.0
0.45
16.1
Room sealed chamber
panel fitted
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 Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
CH Water Temp. (Approx. max.) °C
°F
37.0
14.8
82
180
37.0
14.8
11.4
2.5
62
144
Domestic Hot Water
Heat Input kW
(Gross) Btu/h
Output to Water (modulating) kW
Btu/h
Burner Pressure mbar
Settings in wg
Gas Supply Pressure (LPG) mbar
in wg
Gas Rate (LPG) m³/h
ft³/h
Flow Rate at 35°C Rise L/min
G.P.M.
Outlet Water Temp. (Approx. max.) °C
°F
Alpha CB24, CB24X and SY9-24 Alpha CB24, CB24X
Alpha CB28 and CB28X Alpha CB28 and CB28X