Measuring Flue Length - Navien LCB700-21RS Installation & Operation Manual

6.2.2 Vertical Coaxial Removal (Type C
Standard Removal System
Ø60/100 => Max. length: A=21 m
Ø80/125 => Max. length: A=70 m
Extended Removal System
Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 21-1 = 20 m
Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 70-1 = 69 m
Pipe Diameter Maximum
(mm) Length (m)
Ø60/100 21
Ø80/125 70
36 Flue System
)
33
A
A
A
Minimum 350 mm
B
Equivalent
Elbow
Length (m)
45° 1.0

6.3 Measuring Flue Length

The gas removal and air intake systems may be oriented in any
direction (north, south, east or west). Some special components
such as elbows are used to help reach certain positions. Each
removal terminal kit includes an adapter for connection to the
boiler and a removal terminal.
The total length of the tubes must not exceed the maximum
value defined. If the removal installation includes elbows while
calculating the total length you must take into account that each
elbow has a resistance equal to a specific linear Leq equivalent
length (see table).
Carefully study the diagrams representing the different types of
removal and select the one that best suits the conditions of your
installation. To choose the removal accessories required for each
installation, see the list of accessories on the NAVIEN price list.
Maximum Total Length
Pipe Diameter
Type
(mm)
Ø60/100
Coaxial
Ø80/125
Equivalent Length of Elbows and Adapters
Pipe Diameter
Type
(mm)
Adapter
Ø60/100 ->
Ø80/125
Coaxial
Ø60/100
Ø80/125
Maximum
Orientation
Length (m)
Horizontal 20
Vertical 21
Horizontal 68
Vertical 70
Equivalent
Elbow
Length (m)
- 0.5
45° 1.0
90° 1.3
45° 1.0
90° 2.2