Lochinvar RPV-I&S - Manual (Page 5)

5
RPV-I&S
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.
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
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.
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.
TABLE - 4
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)
TABLE - 5
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)
TABLE - 7
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)
Figure 5
TABLE - 6
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
Requires high altitude
Kit. Call the supplier or
the manufacturer No reduction
in vent length
required No reduction
in vent length
required over 3,000-
10,000 ft
(914.5-3048m)
0-3,000 ft
(0-914.5m) No reduction
in vent length
required No reduction
in vent length
required None