American International PR 100-34 2NV or 2PV Manual Do Utilizador

7

The following plastic materials may be used for both the 
combustion air inlet and exhaust outlet piping subject to 
state and local codes:

•  Schedule 40 PVC or ABS

•  Schedule 40 or 80 CPVC

•  DWV Pipe is acceptable
Note:  Use only solid (not foam core) piping.

Plastic pipe and fittings are available through most plumb-
ing suppliers.  Always check the marking on the pipe to 
make sure you are using the correct material.

Important: Do not use vent elbows in this vent pipe installa-
tion (see figure 5 below).

The following guidelines should be followed when installing 
the air inlet and exhaust outlet piping:

•  Venting should be as direct as possible with a minimum 

number of pipe fittings.

•  Vent diameter must not be reduced unless specifically   

noted in the installation instructions.

•  All 2” horizontal vent piping must be sloped upward    

1/4 inch per foot (3” Piping must slope upward at 1/8” 
per foot) so that condensate will run back to the heater  
and exit through the condensate trap.

•  Support all horizontal pipe runs every four feet and     

all vertical pipe runs every six feet or according to     
local codes. 

•  Vents run through unconditioned spaces where below  

freezing temperatures are expected should be  properly 
insulated to prevent freezing.  For horizontal runs, wrap 
the vent pipe with nationally recognized/listed heat tape 
and/or approved insulation for freeze protection. Install 
per the manufacturer’s instructions.

•    An air intake filter is included with the unit and must be 
       installed according to the installation instructions 
       supplied with the filter.
The combustion air inlet and exhaust outlet piping and 
termination may be installed in one of the following type 
terminations:

 

1.   Standard Horizontal (2 Pipe) 

 

2.   Alternate Horizontal (2 Pipe)

 

3.   Vertical (2 Pipe) 

 

4.    Concentric Vent - Through the Wall

 

5.    Concentric Vent - Through the Roof

All pipe, fittings, pipe cement, primers and procedures 
must conform to American National Standard Institute and 
American Society for Testing and Materials (ANSI/ASTM) 
standards in the United States. This water heater has been 
design certified by the Canadian Standards Association for 
use with the specified (CSA) listed plastic vent pipe. 

All joints in the inlet and outlet piping must be properly 
cemented. Size and cut all piping before cementing.

1.   Cut the pipe end square and remove all ragged edges 

and burrs.  Make sure the inside of the pipe is clean 
and free of cuttings and loose dirt.  Chamfer the end 
and apply primer to the fitting and pipe.  

2.    Using a suitable grade of pipe cement, apply a moder-

ate, even coat inside the fitting.  Apply a liberal amount 
of cement to the outside of the pipe to socket depth. 

Note: It is important to select the proper pipe cement for 
the type of plastic pipe being used.

3.   Assemble the parts quickly while the cement is             

still wet. Twist the pipe 1/4 turn during insertion                  

 

and hold for 30 seconds.

Size the exhaust outlet and combustion air inlet pipes as 
specified in Table 1. This table lists the maximum allow-
able length in feet of the exhaust outlet and combustion air 
inlet pipes as related to the number of required elbows and 
the termination. The specified maximum lengths are for 
the separate inlet and exhaust pipe systems and not the 
combined length of both systems. Minimum pipe length is 
6 feet with one elbow per side.

1.   Determine termination type and pipe size.
2.   Determine number of elbows in exhaust pipe. Do not 

include the elbows in the termination or the condensate 
trap.  Corresponding number Indicates the maximum 
length of exhaust pipe.

3.   Determine number of elbows in inlet pipe.  Do not  

include the elbows in the termination.  The correspond-
ing number indicates the maximum length of inlet pipe.