4
SECTION 2
TECHNICAL DATA
2.1 Central Heating
A28
A32
A36
Heat input (kW)
20
25
30
Maximum heat output (kW) 60/80°C
19.6
24.45
29.31
Minimum heat output (kW) 60/80°C
5.9
6.9
6.84
Maximum heat output (kW) 30/50°C
21.00
26.30
31.83
Minimum heat output (kW) 30/50°C
6.40
7.47
7.41
Minimum working pressure
0.5 bar
Maximum working pressure
2.7 bar
Minimum flow rate
350 l/h
2.2 Domestic Hot Water
A28
A32
A36
Heat input (kW)
28
32
36
Flow Rate:
∆
T35
o
C
11.5 l/pm
13.1 l/pm
14.7 l/pm
Maximum inlet pressure
6.0 bar
Minimum inlet pressure
0.15 bar
Minimum flow rate
2.0 l/min
2.3 Gas Pressures
A28
A32
A36
Inlet pressure (G20)
20.0 mbar
Heating maximum gas rate (m
3
/hr)
2.12
2.64
3.17
DHW maximum gas rate (m
3
/hr)
2.96
3.38
3.81
Minimum gas rate (m
3
/hr)
0.63
0.74
0.74
Injector size (mm)
6.7
6.7
7.0
2.4 Expansion Vessel
A28
A32
A36
Capacity
8-litres
10-litres
10-litres
Maximum system volume
76-litres
91-litres
91-litres
Pre-charge pressure
1.0 bar
2.5 Dimensions
A28
A32
A36
Height (mm)
780
780
780
Width (mm)
400
450
450
Depth (mm)
358
358
358
Dry weight (kg)
40
43
45
2.6 Clearances
PROCOMBI A Range
Sides
12mm
Top
150mm from casing or 25mm above flue elbow (whichever is applicable)
Bottom
150mm
Front
600mm
2.7 Connections
PROCOMBI A Range
Flow & return
22mm
Gas
15mm
DHW hot & cold
15mm
Safety valve
15mm
Condense
21mm
2.8 Electrical
A28
A32
A36
Power consumption (Watts)
150W
150W
150W
Voltage (V/Hz)
230/50
Internal fuse
3.15A T (for PCB) - 3.15A F (for connections block)
External fuse
3A
2.9 Flue Details (concentric)
A28
A32
A36
Maximum horizontal flue length (60/100mm)
7.8m
7.8m
7.8m
Maximum vertical flue length (60/100mm)
8.8m
8.8m
8.8m
Maximum horizontal flue length (80/125mm)
20m
20m
20m
Maximum vertical flue length (80/125mm)
25m
25m
25m
2.9A Flue Details (twin pipes)
A28
A32
A36
Maximum horizontal flue length (80mm/80mm)
40m/40m
35m/35m
35m/35m
Maximum vertical flue length (80mm/80mm)
40m/40m
35m/35m
35m/35m
2.10 Efficiency
A28
A32
A36
SEDBUK (%)
90.3
90.2
90.1
2.11 Emissions
A28
A32
A36
CO
2
@ maximum output (%)
9.0
9.0
9.0
CO
2
@ minimum output (%)
9.0
9.0
9.0
CO/CO
2
ratio @ maximum output
0.002 to 1
0.002 to 1
0.002 to 1
CO/CO
2
ratio @ minimum output
0.0004 to 1
0.0004 to 1
0.0004 to 1
CO @ maximum output (mg/kWh)
182.8
215.0
215.0
CO @ minimum output (mg/kWh)
53.8
32.3
32.3
NOx @ maximum output mg/kWh)
105.9
105.9
88.3
NOx @ minimum output (mg/kWh)
61.8
61.8
70.6
NOx rating
class 5
class 5
class 5
