Install Instructions

Installation & Servicing Instructions Rinnai E-Series
35
Calculation of equivalent length vent system
Choose the vent type and fi ll out the corresponding table.
* See equivalent length tables above.
Example of calculation:
Twin tube (parallel) with terminal
Combustion air length : 24 ft with elbow 3 x 90°
Vent length : 24 ft with elbow 2 x 90°, elbow 2 x 45°
Calculation:
Equivalent Air Length : (24+3x6+2) x 0.5 = 23 ft
Equivalent Vent Length : (24+2x6+2x3+2) x 0.5 = 23 ft +Total = 46 ft.
6.7.6 Combustion air and vent piping lengths.
In the table below you will fi nd the maximum equivalent pipe length of the vent/air
system based on 3" diameter. These lengths are for single pipe (room air) and twin
pipe.
Equivalent vent length table 8
Boiler t
yp
e 3” Max Vent e
q
uivalent len
g
th 3” Max Air e
q
uivalent len
g
th
E50C 100 feet 100 feet
Parallel system
Length tube Number of
elbows 90°
x 6*
Number of
elbows 45°
x 3*
Concentric
terminal
A
dd 5 ft.
*
Total Multiply with
factor
Equivalent
length
Combustion air
ft ft ft ft ft 0.5 ft
V
ent
ft ft ft ft ft 0.5 ft
ft
Total equivalent len
g
th
Equivalent friction loss of PVC/CPVC table 9
Fittings or Piping Equivalent PVC
feet m
45 degree elbow 3 0.91
90 degree elbow 6 1.83
plastic pipe per foot 1 0.30
concentric vent kit 3 0.91
Centrotherm PPs Equivalent len
g
ths for pipin
g
fittin
g
s
feet meters
45 degree elbow 6 1,83
87 degree long elbow 12 3,66
Termination Tee 12 3,66
Twin Pipe to Concentric Adapter 4 1,22
Low profile wall termination 12 3,66
Velocity Cone 12 3,66
Equivalent friction loss of Centrotherm PPC table 9a
Concentric s
y
stem
Length concentric
tube, boiler to roof
horizontal
Number of
elbows 90°
x 6*
Number of
elbows 45°
x 3*
Concentric
terminal
A
dd 2 ft.
*
Total Multiply with
factor
Total equivalent
length
ft ft ft ft ft 1.0 ft