A.O. Smith T-H3-DV User Manual

15 Page
-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The Indoor models can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to
149°F).VentmaterialcertifiedtoULCS636standardsisrecommendedintheUSA.InCanada,plastic
ventingmustbecertifiedtoULCS636standards.
• Themaximumlengthofexhaustventpipingmustnotexceed70ft.(21.3m)for3”venting,which
dependsontheelevationwherethewaterheaterisinstalled,and100ft.(30.5m)for4”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.
Installaon
Installaon Manual
Item Material United States Canada
Exhaust pipe and
Fittings
Schedule 40 PVC
ANSI/ASTMD1785
ULCS636Certified
Materials Only
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
NOTE: Do NOT Use Cellular Foam Core Pipe
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
3in.(76mm) 5 70ft.(21.3m)
4in.(102mm) 5 100ft.(30.5m)
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
No. of Elbows
Max. Vertical or Horizontal (Total) Vent Length
3" venting 4" venting
Up to 3,000 ft Up to 6,000 ft Up to 10,100 ft Up to 10,100 ft
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)
Excludes vent terminators, termination elbows, or rain caps.
Fordetailsontheventconnection,refertop.16andp.17.
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A.O. Smith T-H3-DV Specifications

General

Brand	A.O. Smith
Model	T-H3-DV
Category	Water Heater
Language	English