Baxi Combi 630 - Page 14

Baxi Combi 624 630
Nominal heat input central heating — Maxi
mum rate
Net (Qn Hi) kW 20.6 20.6
Gross (Qn Hs) kW 22.86 22.86
Nominal heat input — Minimum rate Net (Qn Hi) kW 6.2 6.2
Gross (Qn Hs) kW 6.87 6.87
Nominal heat output 80/60°C — domestic hot
water — Maximum rate
Pn kW 25 30
Nominal heat output 80/60°C — central heat
ing — Maximum rate
Pn kW 20 20
Nominal heat output 80/60°C — central heat
ing — Factory setting
Pn kW 20 20
Nominal heat output 80/60°C — Minimum
rate
Pn kW 6.2 6.2
Nominal heat output 50/30°C — central heat
ing — Maximum rate
Pnc kW 21.16 21.16
Nominal heat output 50/30°C — central heat
ing — Minimum rate
Pnc kW 6.7 6.7
Tab.6 Central heating circuit specifications
Baxi Combi 624 630
Maximum pressure bar 3 3
Minimum pressure bar 0.5 0.5
Central heating temperature adjustment (±5°C) °C 25 / 80 25 / 80
Expansion vessel water capacity litres 7.0 7.0
Expansion vessel pre charge pressure bar 1.0 1.0
Maximum capacity of central heating system litres 100 100
Primary water content of boiler (unpressurised) litres 2.5 2.5
Tab.7 Domestic hot water circuit specifications
Baxi Combi 624 630
Maximum pressure bar 8 8
Dynamic minimum pressure bar 0.5 0.5
Minimum working water flow rate
(1)
l/min 2.0 2.0
Specific flow rate (D) l/min 10.2 12.2
Domestic hot water temperature range adjustment
±5°C
°C 35 / 60 35 / 60
Production of domestic hot water with ΔT = 30°C l/min 12 14.3
Production of domestic hot water with ΔT = 35°C l/min 10.2 12.2
(1) 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 624 630
Natural gas rate (G20) Qmax
m
3
/h
2.71 3.26
Natural gas rate (G20) Qmin
m
3
/h
0.67 0.67
3 Technical specifications
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