Lochinvar RPV-I&S High Altitude Lengths, Minimum, For LOW Ground Clearance Installations

NOTE: For installations requiring both horizontal and vertical runs,

the following rule must be followed: Total number of feet of straight pipe (both horizontally and vertically) must not exceed the allowable length listed in the “Through The Wall” section of the table for total number of elbows used. Also: Total number of vertical feet of straight pipe must not exceed the allowable length listed in the “Through The Roof” section of the table for total number of elbows used. For angular rises in venting, any angle that is greater than or equal to 45° from the horizontal should be considered a vertical rise.

THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE:

When venting cannot exit through the wall at a height greater than or equal to 12" (30.5 cm) above the ground, or anticipated snow level, the installation must be modified as shown below (see Figure 5). Refer to Table 4 for maximum venting lengths using 3" (7.6 cm) PVC or Table 5 for maximum lengths using 4" (10.1 cm) PVC.

Figure 5

3" (7.6 cm) PVC VENT CONNECTOR LENGTHS FROM INSIDE WALL

FOR LOW GROUND CLEARANCE INSTALLATIONS
Terminating	# of	Maximum	Minimum
	Elbows	Length	Length
(2) 90° Elbows with (1) 90° Elbow	1	30 ft (9.1 m)	5 ft (1.5 m)
(2) 90° Elbows with (1) 90° Elbow	2	25 ft (7.6 m)	6 ft (2 m)
(2) 90° Elbows with (1) 90° Elbow	3	20 ft (6.1 m)	8 ft (2.5 m)
(2) 90° Elbows with (1) 90° Elbow	4	15 ft (4.6 m)	10 ft (3 m)

RPV-I&S

of the water heater, the following guidelines must be followed. Refer to the venting tables below for maximum distances for the altitudes in your location.

HIGH ALTITUDE LENGTHS

Altitude	Max. venting	Max. venting	Modifications to
above	length reduction	length reduction	water heater
sea level	from tables	from tables
	2 & 4	3 & 5
0-3,000 ft	No reduction	No reduction	None
(0-914.5m)	in vent length	in vent length
	required	required
over 3,000-	No reduction	No reduction	Requires high altitude
10,000 ft	in vent length	in vent length	Kit. Call the supplier or
(914.5-3048m)	required	required	the manufacturer

Part II - Venting Specifications for:

40 Gallon, 40,000 BTU input (151.4 L, 11.7 kW/Hr)

48 Gallon, 40,000 BTU input (189.3 L, 11.7 kW/Hr)

This water heater is a power vented appliance and is designed to vent its products of combustion through 2" (5.1 cm) or 3" (7.6 cm) diameter Schedule 40 (solid or cellular core) PVC pipe to the outdoors. The water heater may be either vented through the wall or vertically through the roof. Use a 3" (7.6 cm) to 2" (5.1 cm) reducer to connect to the vent outlet when using 3" (7.6 cm) PVC. Apply PVC cement at PVC locations. Table 7 lists the maximum vent lengths for this water heater using 2" (5.1 cm) PVC. If possible, locate the water heater so that the venting length and number of elbows are kept to the minimum distance necessary to reach the outside. If the installation requires venting lengths that exceed the lengths listed for 2" (5.1 cm) PVC in Table 7 then use 3" (7.6 cm) PVC for the vent connector. Table 8 lists the venting distances allowed with 3" (7.6 cm) diameter PVC pipe. When venting with 3" (7.6 cm) PVC, use a 3" (7.6 cm) to 2" (5.1 cm) reducer to exit through the building wall with 2" (5.1 cm) PVC. Use the 2" (5.1 cm) vent terminal supplied with the water heater to terminate on the outside of the building. If the length of the 2" (5.1 cm)needed to go through the wall is greater than 14" (35.6 cm), use 3" (7.6 cm) PVC to go through the wall and reduce to 2" (5.1 cm) PVC immediately after exiting the outside wall. Refer to the venting illustrations on the following pages. Make sure the vent pipe terminal is at least 1" (2.5 cm) away from the edge of the wall. To vent horizontally with zero (0) elbows, remove 3 screws from blower housing and rotate the blower housing 90° clockwise (see Figure 7). Replace the three (3) screws once blower housing rotation is complete.

4" (10.1 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL

FOR LOW GROUND CLEARANCE INSTALLATIONS

Terminating (Reduce 4" to 3")	# of	Maximum	Minimum
(Reduce 10.1 cm to 7.6 cm)	Elbows	Length	Length
(2) 90° Elbows with (1) 90° Elbow	1	60 ft (18.3 m)	10 ft (3 m)
(2) 90° Elbows with (1) 90° Elbow	2	55 ft (16.8 m)	12 ft (3.7 m)
(2) 90° Elbows with (1) 90° Elbow	3	50 ft (15.2 m)	15 ft (4.6 m)
(2) 90° Elbows with (1) 90° Elbow	4	45 ft (13.7 m)	18 ft (5.5 m)
(2) 90° Elbows with (1) 90° Elbow	5	40 ft (12.2 m)	22 ft (6.7 m)

HIGH ALTITUDE INSTALLATIONS FOR ELEVATIONS OVER 3,000 FEET (914.5 m) ABOVE SEA LEVEL

The capacity of the induced draft blower declines with increasing altitude due to a reduction in the air density. In order to assure safe and reliable performance

VENT CONNECTOR LENGTHS FOR 2" (5.1cm) DIAMETER PVC

Terminating	# of 90° Elbows	Maximum	Minimum
	(excluding vent	Length	Length
	terminal)
Through the Wall	0	45 ft (13.7m)	2 ft (.6 m)
Through the Wall	1	40 ft (12.2m)	2 ft (.6 m)
Through the Wall	2	35 ft (10.7m)	2 ft (.6 m)
Through the Wall	3	3 0 ft (9.2 m)	2 ft (.6 m)
Through the Wall	4	25 ft (7.6 m)	3 ft (.9 m)
Through the Roof	0	31 ft (9.5 m)	3 ft (.9 m)
Through the Roof	1	28 ft (8.5 m)	3 ft (.9 m)
Through the Roof	2	25 ft (7.6 m)	3 ft (.9 m)
Through the Roof	3	22 ft (6.7 m)	3 ft (.9 m)
Through the Roof	4	19 ft (5.8 m)	4 ft (1.2 m)

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