Coaxial Venting Instructions; Coaxial Vent Screw Placement - ECR International Utica Boilers MAH-125 Installation, Operation And Maintenance Manual

5.6 Coaxial Venting Instructions

Maximum equivalent flue lengths for Coaxial venting are:
Coaxial Pipe Vent Lengths
(Includes First Elbow And Termination)
Boiler Size 125/150
4"/2"
Vent Size
[100mm/60mm]
Natalini 32.8 ft [10m]
DuraVent 27.88 ft [8.5m]
Centrotherm 24.60 ft [7.5m]
Coaxial Elbows - Equivalent length
4"/2" [100 mm/60 mm]
45°
90°
5" / 3" [128 mm/80 mm]
45°
90°
Coaxial Termination - Equivalent length 3 ft (0.9m)
NOTE: Coaxial venting can run horizontal or vertical.
• Connect flue elbow to top of boiler and adjust direction of
elbow to desired orientation (rear, right or left).
• Measure distance from outside wall face to elbow, this
dimension will be known as 'X", add distance "Y" + 2" (60
mm) to "X" this is the total dimension of the vents. See
Figure 5-3.
• Mark dimension from above on outer aluminum intake
vent. Measure length of waste material, and transfer
dimension to inner grey flue pipe.
• Remove waste from both vents (flue and air). Verify cut
ends are square and free from burrs. Insert flue back into
intake air vent and pass them through hole in wall.
• Check all measurements before cutting. Clearance to
combustible materials is zero when using coaxial vent
system.
• After installing venting use calibrated analyzer to verify
there is no recirculation of combustion.
• Ensure termination is positioned with slots at the bottom.
Figure 5-2 - Coaxial Screw Placement
5 - COMBUSTION AIR AND VENT PIPING
165/205
5"/3"
[128mm/80mm]
Maximum Minimum
32.8 ft [10m]
1.64 ft. [0.5 m]
3.28 ft. [1.0 m]
1.64 ft. [0.5 m]
3.28 ft. [1.0 m]
Asphyxiation hazard. Before securing the screws
ensure the pipe has been pushed in a minimum of
1-3/4" (45 mm) into the gasketed end of the other
pipe. Failure to follow these instructions could result in
ALL
death or serious injury.
ALL
FIGURE 5-3 - Coaxial Venting Horizontal or Vertical
CAN BE USED ON ALL SIZES
6 ft.
[1.8m]
WT = Wall Thickness
Note: 2" is insertion depth of straight pipe to elbow.
5.4 Coaxial Vent Screw Placement - See Figure 5-2
Two (2) screws shall be fastened through the outer intake pipe
behind the gaskets at equal distances, approximately 180°
apart. Note the screws used must be no larger than No. 8-3/4
sheet metal screws and must be zinc coated.
18
WARNING
!
2"
240011941 REV G, [06/30/2019]
2"