Installation Sheet

Installation & Servicing Instructions Rinnai E-Series
37
Calculation of equivalent length vent system
Choosetheventtypeand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 = 22 ft
Equivalent Vent Length : (24+2x6+2x3+2) x 0.5 = 22 ft +Total = 44 ft.
6.6.7 Combustion air and vent piping lengths.
Inthetablebelowyouwill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 and concentric venting systems.
Equivalent vent length table 8
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 3" PPs E
q
uivalent len
g
ths for
p
i
p
in
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
Maximum Equivalent Length (Dimension in Feet) - Model & Vent Type Specifi
c
Item # Vent type
E60SR
E85SR
E110SR
feet
1 2” PPS Single Pipe (Room Air) & Twin Pipe
40
2 3” PPS Single Pipe (Room Air) & Twin Pipe 100
3 2” PPS Twin Pipe to 2”/4” PPS Cnctrc. Termination 40
4 3” PPS Twin Pipe to 3”/5” PPS Cnctrc. Termination ---
5 3”/5”PP Concentric Pipe 100
6
20
7 50
8
2” Flex Vent
3” Flex Vent
100
3” PVC/CPVC Single Pipe & Twin Pipe w/or without 3” CVK Termination