21
Page
-Exhaust vent (
ABS, PVC, CPVC, or polypropylene
vent)-
The indoor models can be vented with schedule 40 PVC (temperature rated up to 149 °F), CPVC, ABS, or
polypropylene.
•
Item
Material
United States
Exhaust pipe and
Fittings
Schedule 40 PVC
ANSI/ASTM D1785
PVC-DWV
ANSI/ASTM D2665
Schedule 40 CPVC
ANSI/ASTM F441
Schedule 40 ABS-DWV
ANSI/ASTM D2661
Polypropylene
UL-1738
Pipe Cement/Primer
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
ABS
ANSI/ASTM D2235
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in
non-metallic venting systems is prohibited.
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
The maximum length of exhaust vent piping must not exceed 70 ft (21.3 m) for 3ʺ venting, which
depends on the elevation where the water heater is installed, and 100 ft (30.5 m) for 4ʺ venting
(deducting 5 ft (1.5 m) for each elbow used in the venting system). Do not use more than 5 elbows.
See the table below.
• When the horizontal vent run exceeds 5 ft (1.5 m), support the vent run at 3 ft (0.9 m) intervals with
overhead hangers.
Installation
Installation Manual
Diameter
Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
3 in
5
70 ft (21.3 m)
4 in
5
100 ft (30.5 m)
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
Vertical or Horizontal (Total) Vent Length
No. of
Elbows*
3" venting
4" venting
0 to 3,000 ft
(0 to 914 m)
3,001 to 6,000 ft
(915 to 1,829 m)
6,001 to 10,100 ft
(1,830 to 3,078 m)
0 to 10,100 ft
(0 to 3,078 m)
0
70 ft (21.3 m)
40 ft (12.2 m)
25 ft (7.6 m)
100 ft (30.5 m)
1
65 ft (19.8 m)
35 ft (10.7 m)
20 ft (6.1 m)
95 ft (29.0 m)
2
60 ft (18.3 m)
30 ft (9.1 m)
15 ft (4.6 m)
90 ft (27.4 m)
3
55 ft (16.8 m)
25 ft (7.6 m)
10 ft (3.0 m)
85 ft (25.9 m)
4
50 ft (15.2 m)
20 ft (6.1 m)
N/A
80 ft (24.4 m)
5
45 ft (13.7 m)
N/A
N/A
75 ft (22.9 m)
*For each elbow added, deduct 5 ft (1.5 m) from max. vent length.
For details on the vent connection, refer to pages 22 to 24.
Excludes vent terminators, one termination elbow, or rain caps.
Содержание 240HX3
Страница 64: ...3PL009 2000599585 Rev B ...
