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Installation Manual
Extending the concentric pipe length beyond the telescoping
f
termination (Fig. 7) is permissible. The maximum straight vent length
allowed is dependant on appliance type and number of elbows used.
See tables below.
Maximum straight vent pipe length allowed for Ø 3" / Ø 5" (Ø 80/125 mm)
concentric pipe
ZBR16-3A
ZBR21-3A
# of 90° elbows used
ZBR28-3A
ZWB28-3A
1
50 ft (15.2 m)
2
44 ft (13.4 m)
3
38 ft (11.6 m)
4
32 ft (9.8 m)
5
26 ft (7.9 m)
6
20 ft (6.1 m)
Friction Loss Equivalent for Fittings
Fitting
45 degree elbow
90 degree elbow
Example:
Model: ZBR28-3A
—
90° elbows used: 2
—
45° elbows used: 2
—
Maximum straight vent pipe allowed: 38ft (11.6m)
Slide the outer wall seal [2] onto the terminal [1] as shown.
f
1
Fig. 8
Position terminal [1] from the outside through the vent opening so
f
rubber thimble [2] is flush against outside wall .
Slide the inner wall seal [3] onto the terminal [1] as shown.
f
Bosch Thermotechnology Corp.
ZBR35-3A
ZWB35-3A
ZBR42-3A
ZWB42-3A
44 ft (13.4 m)
38 ft (11.6 m)
32 ft (9.8 m)
26 ft (7.9 m)
Fig. 9 Inserting termination from the outside
20 ft (6.1 m)
14 ft (4.3 m)
Connect the termination to the elbow or to additional concentric pipe
f
if extending the vent length.
Equivalent
feet
m
3
0.91
6
1.82
Fig. 10 completed adapter and concentric assembly
Ensure all components are properly connected and aligned, and that
f
the termination has the proper pitch as shown in Fig. 6.
Tighten the four screws of the appliance adapter on the appliance.
f
2
Complete installing the appliance per the Boiler Installation
f
Instructions.
Concentric Horizontal Vent Kit | 9
3
1
1.
2.
2
Data subject to change
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