Potterton Assure Combi
25
30
Nominal heat input central heating — Maxi
mum rate
Net (Qn Hi)
kW
20.6
25.77
Gross (Qn Hs)
kW
22.86
28.58
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
25
Nominal heat output 80/60°C — central heat
ing — Factory setting
Pn
kW
20
25
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
26.33
Nominal heat output 50/30°C — central heat
ing — Minimum rate
Pnc
kW
6.7
6.7
Tab.6
Central heating circuit specifications
Potterton Assure Combi
25
30
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
Potterton Assure Combi
25
30
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
Potterton Assure Combi
25
30
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
14
7678846 - A - 22052017
