Bosch GWH C 920 ES Instruction Manual page 10

Installation instructions
3.3.1 Vent material
All combustion air and vent pipe materials and fittings
must comply with the following:
Item Material
PVC schedule 40
Vent or
PVC-DWV
air pipe
and
CPVC schedule 40
fitting
ABS-DWV schedule 40 ANSI/ASTM D2661
PVC
Pipe
cement /
CPVC
primer
ABS
Table 2 Approved vent material
For specific questions concerning vent material,
specifications, usage or installation, please
contact the vent manufacturer directly.
Do not use cellular foam core pipe.
i
All vent connections must be glued, except for the
exhaust accessory (see section 3.3.4) which is
screwed into place on the top of the appliance. Slide
the vent pipe into the exhaust accessory. The exhaust
pipe must be properly supported and must be pitched
a minimum of a ¼ inch per foot back to the appliance.
This allows the condensate to drain properly.
An optional concentric vent/air intake termination can
be used for the installation of a vertical or horizontal
venting system. (see Fig. 8).
The concentric vent/air intake body can be ordered
from your local wholesaler. (Part# BWH60L46).
The appliance can also be installed with separate air
intake and exhaust piping (see Fig. 11, Fig. 17 and Fig.
18, page 16).
Description Length
3- In. Rain Cap
4- In. Diameter
24 In. long
SDR-26 Pipe
3- In. Y
Concentric Fitting
2- ½ In. Diameter
37-1/8 in. long
SDR-26 Pipe
Table 3 Concentric vent part breakdown
10
United States Canada
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
CSA or ULC
certified only
(ULC-S636)
ANSI/ASTM D2564
ANSI/ASTM F493
ANSI/ASTM D2235
Kit part no. and
quantity
BWH60L46
N/A 1
1
N/A 1
1
MAINTAIN 12 IN. (18 IN. FOR CANADA)
MINIMUM CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24 IN. ABOVE ROOF.
CONCENTRIC
VENT KIT
(BWH60L46)
INTAKE
3 (76mm) "
Fig. 8 Concentric vent kit example
EXHAUST
COMBUSTION
AIR
ROOF BOOT/
FLASHING (FIELD
SUPPLIED
EXHAUST
3 (76mm) "
DRAIN TEE
6720608836-27.1Av
6 720 608 836