Baxi Combi 224 Installation And Service Manual page 14

3 Technical specifications
Baxi Combi
Nominal heat output
50/30°C — Central Heating
— Maximum Rate
Nominal heat output
50/30°C — Central Heating
— Minimum Rate
Tab.6 Central heating circuit specifications
Baxi Combi
Maximum pressure
Minimum pressure
Central heating temperature adjust­
ment ±5°C
Expansion vessel water capacity
Expansion vessel pre charge pres­
sure
Maximum capacity of central heat­
ing system
Primary water content of boiler (un­
pressurised)
Tab.7 Domestic hot water circuit specifications
Baxi Combi
Maximum pressure
Dynamic minimum pressure
Minimum working water flow rate
Specific flow rate (D)
Domestic hot water temperature
range adjustment ±5°C
Production of domestic water with
ΔT = 30°C
Production of domestic water with
ΔT = 35°C
Where low flow taps or fittings are intended to be used in the DHW system connected to the boiler, it is strongly recommended
that the DHW flow rate DOES NOT fall below 2.5 l/min. This will ensure reliable operation of the DHW function.
Tab.8 Characteristics of combustion
Baxi Combi
Natural gas rate (G20) Qmax
Natural gas rate (G20) Qmin
Diameter of coaxial discharge
pipes
Tab.9 Electrical specifications
Baxi Combi
Nominal electrical power supply
voltage
Nominal electrical power supply
frequency
14
224
Pnc kW 21.8
Pnc kW 5.2
224
bar 3
bar 0.5
°C 25/80
litres 7.0
bar 1.0
litres 120
litres 2.5
224
bar 8.0
bar 0.5
l/min 2.0
l/min 11.5
°C 35/60
l/min 11.4
l/min 9.8
224
2.61
3
m /h
0.52
3
m /h
mm 60/100 & 80/125
224
V 230
Hz 50
228
26.1
5.2
228
3
0.5
25/80
7.0
1.0
120
2.5
228
8.0
0.5
2.0
13.4
35/60
13.3
11.5
228
3.06
0.52
60/100 & 80/125
Important
Dynamic (nominal) inlet pressure (Natural gas — G20) 20mbar
3
with a CV of 37.78 MJ/m
228
230
50
424 428
21.8 26.1
5.2 5.2
424 428
3 3
0.5 0.5
25/80 25/80
7.0 7.0
1.0 1.0
120 120
2.5 2.5
424 428
8.0 8.0
0.5 0.5
2.0 2.0
11.5 13.4
35/60 35/60
11.4 13.3
9.8 11.5
424 428
2.61 3.06
0.52 0.52
60/100 & 80/125 60/100 & 80/125
424 428
230 230
50 50
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