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