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Installation & Servicing Instructions Rinnai E-Series
33
6.7.7 Calculation of compensation factor
The compensation factor eliminates or reduces the natural effect of derate of maximum
input caused by the resistance of the vent system and/or the impact of the altitude.
1. Determine the Compensation Factor Vent System CF(V) in the table below.
2. Determine the Compensation Factor Altitude CF(A) in the table below.
Any application or installation above 10,000 must be reviewed by Rinnai's
Engineering group. This is to ensure the product is installed and the overall
system is designed properly and that the units are commisioned properly.
Not involving of Rinnai's Engineering group would result in no support of the
product and no warranty.
3. Calculate the Compensation Factor Total CF(T):
CF(T) = CF(V) + CF(A)
The result is the setting for Parameter 73.
Change parameter 73 according to this result. See Chapter 10.1 how to change
parameters.
Example of calculation:
E110
Eq. lenth vent system (taken from previous example) 46 ft CF(V) = 6
Altitude 7,200ft CF(A) = 42 +
CF(T) = 48
Parameter setting (Par. 73) = 48
Do not overcompensate the boiler by setting a higher value than calculated,
otherwise the boiler could be seriously damaged.
Compensation factor vent system CP(V) table 10
Compensation factor altitude CP(A) table 11
E75 E110
min max
0 10 0 0
11 20 0 0
21 30 0 2
31 40 1 4
41 60 2 6
61 80 3 8
81 100 4 10
CF (V)
Boiler typeEq. length (ft)
min max
0 1
1,000 2,000
2,000 3,000
3,000 4,000
4,000 5,000
5,000 6,000
6,000 7,000
7,000 8,000
8,000 9,000
9,000 10,000
18
24
54
30
36
42
48
CF (A)
0
6
12
Altitude (ft) Boiler type
E75
,
E110
!
WARNING
NOTICE
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