Pressure Drop And Water Flow Curve With Hydraulic Separation; Water Flow (Gpm) - Rinnai I Series Installation And Operation Manual

Example: If there is a 4 GPM system flow demand, there would be approximately 15 ft of head
available for the system. If more pressure drop is present in the central heating system, a means of
hydraulic separation is necessary.
55
50
45
40
35
30
25
20
15
10
5
0
0 1 2
1
If the pressure drop of the system exceeds the available pressure, the use of primary/secondary
piping is necessary.
2
Rinnai requires the use of primary/secondary piping with the use of this model.
58
NOTE
To ensure proper CH and DHW internal flow rates,
the pump should be set to speed 3.
3 4 5

Water Flow (GPM)

Model
i060C
i090C
i120C
6 7 8
Available Pressure Drop
1
15 ft at 3.2 GPM
1
8.5 ft at 4.8 GPM
2
Not Applicable
Rinnai I-Series Condensing Boiler Combi Manual
i120C
i060C and
i090C
11
9 10
12