Lochinvar RPV-I&S - Manual (Page 4)

4
RPV-I&S
diameter PVC pipe. When venting with 4" (10.2 cm) PVC, use a 4" (10.2 cm) to
3" (7.6 cm) reducer to exit through the building wall with 3" (7.6 cm) PVC. Use
the 3" (7.6 cm) vent terminal supplied with the water heater to terminate on
the outside of the building. If the length of 3" (7.6 cm) PVC needed to go
through the wall is greater than 14" (35.5 cm), use 4" (10.2 cm) to go through
the wall and reduce to 3" (7.6 cm) PVC immediately after exiting the outside
wall. Refer to the venting illustrations on the following pages. Make sure the
vent pipe terminal elbow fitting is at least 1" (2.5 cm) away from the edge of
the wall.
NOTE: When using 4" (10.1 cm) PVC, use a 4" (10.1 cm) to 3" (7.6
cm) reducer and exit the building wall with 3" (7.6 cm) PVC using the
3" (7.6 cm) 90° vent terminal supplied. Two 45° elbows are equivalent
to one 90° elbow.
NOTE: ABS or CPVC pipes may be substituted for PVC pipe. Do not
mix ABS and PVC pipe in the same installation.
THROUGH THE WALL VENTING:
Cut a 3-1/2 inch (8.9 cm) diameter hole in the wall at the point where the vent
connector is going to pass through the wall. Use the proper cement to secure
the 90° vent terminal provided with the water heater to the vent connector.
The distance between the edge of the 90° vent terminal and the exterior wall
(see Figure 3) must be 1 inch (2.5 cm). Use the proper cement and assembly
procedures to secure the vent connector joints between the terminal and the
blower outlet. Provide support brackets for every 3 feet (.91 m) of horizontal
vent.
THROUGH THE ROOF VENTING: (VERTICAL VENTING)
Cut the necessary holes through the roof and ceiling and install the vent
connector as shown in
Figure 4. Make sure that the installation meets the local
codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or CGA/
CAN B149 Installation Code.
Figure 2
TABLE - 3
VENT CONNECTOR LENGTHS FOR 4" (10.1 cm) DIAMETER PVC
Terminating # of 90° Elbows Maximum Minimum
(excluding vent Length Length
terminal)
Through the Wall
1 70 ft (21.3 m) 2 ft (.6 m)
Through the Wall 2 65 ft (19.8 m) 3 ft (.9 m)
Through the Wall 3 60 ft (18.3 m) 5 ft (1.5 m)
Through the Wall 4 55 ft (16.8 m) 8 ft (2.4 m)
Through the Wal 5 50 ft (15.3 m) 12 ft (3.6 m)
Through the Roof 1 70 ft (21.3 m) 2 ft (.6 m)
Through the Roof 2 65 ft (19.8 m) 3 ft (.9 m)
Through the Roof 3 60 ft (18.3 m) 5 ft (1.5 m)
Through the Roof 4 55 ft (16.8 m) 8 ft (2.4 m)
Through the Roof 5 50 ft (15.3 m) 12 ft (3.6 m)
IMPORTANT
All of the Venting connections must be leak checked with a soap and
water solution upon initial start up of the water heater. Any leaks
must be repaired before continuing operation of the water heater.
Figure 3
Figure 4
TABLE - 2
VENT CONNECTOR LENGTHS FOR 3" (7.6 cm) DIAMETER PVC
Terminating # of 90° Elbows Maximum Minimum
(excluding vent Length Length
terminal)
Through the Wall
1 40 ft (12.2 m) 2 ft (.6 m)
Through the Wall 2 35 ft (10.7 m) 3 ft (.9 m)
Through the Wall 3 30 ft (9.1 m) 5 ft (1.5 m)
Through the Wall 4 25 ft (7.6 m) 8 ft (2.4 m)
Through the Roof 1 40 ft (12.2 m) 2 ft (.6 m)
Through the Roof 2 35 ft (10.7 m) 3 ft (.9 m)
Through the Roof 3 30 ft (9.1 m) 5 ft (1.5 m)
Through the Roof 4 25 ft (7.6 m) 8 ft (2.4 m)