Installation Guide

58 Rinnai I-Series Condensing Boiler Combi Manual
Example: If there is a 4 GPM system ow demand, there would be approximately 15  of head
available for the system. If more pressure drop is present in the central heang system, a means of
hydraulic separaon is necessary.
0 1 2 3 4 5 6 7 8 9 10
20
15
25
30
10
5
0
Water Flow (GPM)
Pressure Loss (Feet of Head)
11
12
55
50
45
40
35
i120C
i060C and
i090C
Model Available Pressure Drop
i060C 15  at 3.2 GPM
1
i090C 8.5  at 4.8 GPM
1
i120C Not Applicable
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.
NOTE
To ensure proper CH and DHW internal ow rates,
the pump should be set to speed 3.