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4.4
Technical data mod. Riva Plus
HE 28S ERP
Heat input
Nominal net
(ch - dhw)
(A)
Nominal gross
(ch - dhw)
(B)
Minimun net
ch - dhw
(A)
Minimun gross
ch - dhw
(B)
Useful output
Maximun (ch - dhw)
Minimun (ch - dhw)
Maximun condensing (ch - dhw)
Minimun condensing (ch - dhw)
Central heating
Min/Max flow temperature settings*
Minimum return temperature
Maximum pressure
Minimum pressure
Available head (in 1000 l/h)
Seasonal efficiency G20
Seasonal effciency G30 G31
* to the minimum useful output
TECHNICAL INFORMATION
kW
29,0
BTU/h 98952
kW
32,2
BTU/h 109837
kW
8,7
BTU/h 29686
kW
9,7
BTU/h 32951
kW
28,3
BTU/h 96564
kW
8,4
BTU/h 28662
kW
30,6
BTU/h 104411
kW
9,1
BTU/h 31050
°C
50-85
°C
40
kPa
250
bar
2,5
kPa
30
bar
0,3
kPa
25
bar
0,25
%
88,1
%
89,1
(C)
Gas supply pressures
Gas
Nom
Natural G20
Min
Max
Nom
Butane G30
Min
Max
Nom
Min
Propane G31
Max
1 mbar approximately equals 10 mm H
Max. gas pressures at the burner
Natural G20
Butane G30
Propane G31
Min. gas pressures at the burner
Natural G20
Butane G30
Propane G31
Ignition gas pressures at the burner
Natural G20
Butane G30
Propane G31
1 mbar approximately equals 10 mm H
Pa
mbar
2000
20
1700
17
2500
25
2900
29
2000
20
3500
35
3700
37
2500
25
4500
45
O
2
Pa
1330
mbar
13,3
Pa
2780
mbar
27,8
Pa
3550
mbar
35,5
Pa
140
mbar
1,4
Pa
260
mbar
2,6
Pa
350
mbar
3,5
Pa
850
mbar
8,5
Pa
2110
mbar
21,1
Pa
2700
mbar
27,0
O
2
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