Lochinvar TNR-I&S-02 service manual Maximum Vent Length Determination

	TNR-I&S-02
Through The Wall Venting With Low Ground Clearance:	COAXIAL VENTING INSTALLATION PROCEDURE
When venting cannot exit through the wall at a height greater than or	WARNING
equal to 12" (30.5 cm) (and above expected snow level) from the ground,
	Improper installation, adjustment, service, or maintenance can cause
then the installation must be modified as shown below (see Figure 16).
	property damage, personal injury, or death. Consult a qualified installer,
Refer to Tables 2 or 3 for maximum venting lengths using 3” (7.6 cm) or
	service agency, or the gas supplier for information or assistance.
4” (10.2 cm) diameter plastic pipe.
	This kit must be used only for terminating this water heater. Do not
Figure 16	use this termination kit for any other appliance. Using this kit on other
	appliances and/or water heaters can result in property damage, personal
Vent Terminal (Low Ground Clearance)
	injury, or death.
	DO NOT operate this water heater until the installation and assembly
	of this kit is complete and the piping completed. Failure to complete
	installation before operation can result in property damage, personal
	injury, or death.
	Before beginning any installation, be sure the main electrical disconnect
	switch is in the OFF position. Electrical shock can cause personal injury
	or death.
	DO NOT operate this water heater with the rain cap removed or
	recirculation of combustion products may occur. Water may also collect
	inside larger combustion-air pipe and flow to the burner assembly.
	Failure to follow this warning could result in product damage, or improper
	operation, personal injury or death.
	CAUTION
	DO NOT use field-supplied couplings to extend pipes. Airflow
Maximum Vent Length Determination	restriction will occur and the water heater pressure switches may cause
	intermittent problems.

Table 3

Direct Vent Maximum Vent Length

Storage	Rated	Max Vent Length (ft)	Max Vent Length (ft)
Capacity	Input	3" PVC or CPVC	4" PVC or CPVC
(Gallons)	(Btu/Hr)
6 0	125,000	1 2 0	1 7 0
6 0	150,000	1 0 0	1 5 0
6 0	199,999	8 0	1 3 0
1 0 0	150,000	1 2 0	1 7 0
1 0 0	199,999	1 0 0	1 5 0
1 0 0	250,000	8 0	1 3 0
1 0 0	300,000	6 0	1 2 0
1 0 0	399,999	5 0	1 0 0

Determining required vent length:

1.Determine the total length of straight vent pipe (in feet) required.

2.Add 5 feet of venting for every 90° elbow.

3.Add 2 ½ feet of venting for every 45° elbow.

4.Total vent length can not exceed “Max. Vent ength” in Table 3.

NOTICE

Do not include the 3" exhaust elbow or vent terminals in determining maximum vent length.

Vertical Installation (Recommended) 1. Become familiar with coaxial vent kit.

Figure 17

Dimensional Layout of Concentric Vent Kit

Figure 18

Concentric Vent Kit Part Identitication

2.Determine the best location for the termination kit.

3.Cut the recommended 5" diameter hole.

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