American Water Heater 40-42K BTU, 50-60K BTU Vent Pipe Installation, Vent Pipe Length

Vent Pipe Installation

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.

•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 prop- erly insulated to prevent freezing. For horizontal runs, wrap the vent pipe with self-regulating 3 or 5 watt heat tape. The heat tape must be U.L. listed and installed per the manufacturer’s instructions.

•Do not connect this venting system with an existing vent or chimney.

•Do not common vent with the vent pipe of any other water heater or appliance.

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.Vertical (2 Pipe)

3.Concentric Vent - Through the Wall

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 CSA International for use with the listed plastic vent pipe material.

IMPORTANT: Do not use vent elbows in this vent pipe installation (see figure 3 below).

Figure 3	CORRECT FITTINGS
Correct and Incorrect
Pipe Fittings
Mesh Metal	90° Medium 45° Sweep		90° Long
Rodent Screen	Sweep Elbow	Elbow	Sweep Elbow
	INCORRECT FITTINGS
	Tee Connector	45° Vent	90° Vent
		Elbow	Elbow

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 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.

Vent Pipe Length

Size the exhaust outlet and combustion air inlet pipes as specified in Table 3 below. This table lists the maximum allowable length in feet of the exhaust outlet and combus- tion 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 3 feet with one elbow per side.

1.Determine termination type and pipe size.

2.Determine number of elbows in exhaust pipe (Do not include elbows in the termination.) Corresponding number indicates the maximum length of exhaust pipe.

3.Determine number of elbows in inlet pipe. (Do not include elbows in the termination.) The corresponding number indicates the maximum length of inlet pipe.

Table 3 - Maximum Allowable Length in Feet of Exhaust and

Inlet Air Pipe - (42K BTU/Hr models only)

Pipe	Number of 90° Elbows (medium or long sweep only)							Termination
Size								Options
	0	1	2	3	4	5	6
(in)
2	40	35	30	25	20	15	10	Std. Horizontal
2	40	35	30	25	20	15	10	Vertical
3	120	115	110	105	100	95	90	Std. Horizontal
3	115	110	105	100	95	90	85	Vertical

Table 4 - Maximum Allowable Length in Feet of Exhaust and

Inlet Air Pipe - (50K/60K BTU/Hr models only)

Pipe	Number of 90° Elbows (medium or long sweep only)							Termination
Size								Options
	0	1	2	3	4	5	6
(in)
2	N/A							Std. Horizontal
2	N/A							Vertical
3	45	40	35	30	25	20	15	Std. Horizontal
3	55	50	45	40	35	30	25	Vertical

NOTE:s:

1.N/A - Not Applicable

2.The above maximum lengths are for outlet pipe systems.

3.Maximum of 6 elbows may be used. Use only medium or long sweep elbows. See figure 8 for details.

4.Two 45° elbows are considered equivalent to one 90° elbow.

5.Minimum length is 3 foot with 1 elbow.

6.Use schedule 40 or 80 CPVC, 40 ABS, or 40 PVC pipe and fittings.

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