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.

Eq. length (ft)

min

max

0

10

11

20

21

30

31

40

41

60

6180

81100

Boiler type

E75 E110

CF (V)

0

0

0

0

02

14

26

38

410

Compensation factor vent system CP(V)

table 10

2. Determine the Compensation Factor Altitude CF(A) in the table below.

Altitude (ft)

min max

01

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

Boiler type

E75, E110

CF (A)

0

6

12

18

24

30

36

42

48

54

i

!

NOTICE

WARNING

Compensation factor altitude CP(A)

table 11

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.

Installation & Servicing Instructions Rinnai E-Series

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Rinnai E75CN, E110CP, E110CN, E75CP user manual Calculation of compensation factor, Boiler type E75 E110

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