ECR International UTICA BOILERS MACF-115, Installation, Operation And Maintenance Manual

Page: 27 / 139

23
5 - COMBUSTION AIR AND VENT PIPING
5.8 Twin Pipe Systems
Twin pipe venting allows exhaust flue and intake flue to be
separated from each other.
Fig 5-8: Horizontal termination required for exhaust pipe,
fresh air inlet can use horizontal termination or raw end of
straight section of pipe.
PVC can be used on
intake only on twin pipe applications.
A.
Twin Pipe CPVC System
CPVC is approved for boiler exhaust. CPVC or PVC are both
approved for air intake.
To transition from Coaxial at the top of the boiler to Twin Pipe
CPVC/PVC a kit is available. See Figure 5-14.
B.
Twin Pipe Polypropylene System
Single wall polypropylene is used for both exhaust and air
intake piping. PVC can be used on intake only on twin pipe
applications.
Use the appropriate transition kit to change from
polypropylene to PVC. To transition from Coaxial, at the top of
the boiler to Twin Pipe polypropylene venting an adapter kit is
available. See Figure 5-13.
C.
Twin Pipe Separated Flue
Exhaust and combustion air intake are not located in same
general location. 5-8, 5-9, 5-10, 5-21, 5-22.
D.
Twin Pipe - Common Atmospheric Zone
Termination
Exhaust and combustion air intake are located in same general
location and are of equal length. See Figures 5-23 through
5-32.
Grade, Snow
& Ice
Maintain 12"(305 mm) US, 18"(457
mm) Canada clearance above highest
anticipated snow level, 24" (610 mm)
above roof.
Avoid locations where snow may drift
and block vent and combustion air.
Ice or snow may cause boiler to shut
down if vent or combustion air becomes
obstructed.
WARNING
Asphyxiation hazard! Improper installation could
result in death or serious injury. Read Twin
Pipe Installation Instructions completely and
understand all requirements before beginning
installation.
!
FIGURE 5-8 - 2"/60 mm & 3"/80 mm Twin Pipe
Separated Horizontal Flue Termination
This Termination
can be used on:
2" / 60 mm ON
165/205
3" / 80 mm
ON ALL SIZES
vent only
FIGURE 5-9 - 2"/60 mm & 3"/80 mm Twin Pipe
Separated Horizontal Flue Termination
This Termination
can be used on:
2" / 60 mm ON
165/205
3" / 80 mm
ON ALL SIZES
vent only
FIGURE 5-10 - 2"/60 mm & 3"/80 mm Twin Pipe
Separated Horizontal Flue Termination With Tee On
Exhaust - CAN BE USED ON ALL SIZES
This Termination
can be used on:
2" / 60 mm
ON ALL SIZES
3" / 80 mm
ON ALL SIZES
vent only
Twin Pipe Maximum Vent Lengths
(Includes first elbow and termination)
Boiler
75/100/115/125/150 165/205 All
Vent Size
3"
[80 mm]
2"
[60 mm]
3"
[80 mm]
2"
[60 mm]
All
Maximum Minimum
Intake
Vent
L1
49 ft
[15m]
85 ft [25.9m]
100 ft
[30.5m]
85 ft
[25.9m]
6 ft
[1.8 m]
Exhaust
Vent
L2
147 ft
[45m]
Combined
Vent
L1+L2
196 ft
[60m]
170 ft
[51.8m]
200 ft
[60.9m]
170 ft
[51.8m]
12 ft.
[3.6 m]
Single Wall Elbows - Equivalent Length
3" (80 mm) 2" (60 mm)
45° bend 0.82 ft [0.25 m] 3 ft [0.91 m]
90° bend 1.64 ft [0.50 m] 5 ft [1.5 m]
NOTE: Two pipe can be installed horizontally or vertically.
240013503 REV A, [03/15/2022]