3.11 Installing FGR duct system
FGR duct system
FGR Installation_monoblock ver. 3
Pos.
Item
Pos.
Item
1
Control damper
5
Temperature sensor
2
Combustion air fan
6
FGR duct
3
Combustion air throttle valve
7
Condensate drain valve
4
Combustion air
In monoblock burner constructions, pos. 2 and 3 are integrated parts of the burner.
Designing FGR piping
When designing the piping, consider the special circumstances of FGR operation.
The temperature in the piping varies constantly during the operation causing expansion
and contraction of the pipes. The temperature differences also cause condensation in
the pipe line.
In long pipe runs the pipe line length can change by over 1" per 212° F. Thus extra load
builds up on pipe connection point, which may result in component failures.
Apply the following rules of thumb for the construction:
28 (102)
M4263 2206EN