Installation Guide

36 Rinnai Tankless Water Heater Installation and Operation Manual
Horizontal Wall
Terminations
Vertical Roof
Terminations
2 in. x 4 in. 2 in. x 4 in. and
3 in. x 5 in.
3 in. x 5 in.
Concentric Pipe: Installation
Instructions
1. Remove and discard screw from concentric
flue connection.
2. Remove exhaust adapter ring (discard for
concentric venting configurations.)
3. Install the concentric vent. Ensure it is
properly seated.
4. Secure the vent pipe to the concentric
flue connection with the supplied screws.
Mount Concentric Pipe Through Wall
If venting behind the unit through an exterior
wall, align the wall mounting bracket template
(located in literature bag) to the wall and follow
instructions on the template for appropriate vent
hole location. Use a level to make sure the wall
mounting bracket is even and level.
Table 15. Concentric Pipe: Maximum Vent Length
Install the venting termination according to
the diagrams and instructions in this manual.
Slope the venting 1/4 in. per foot (21 mm per
meter) toward the appliance according to the
vent manufacturer’s installation instructions.
Dispose of condensate per local codes.
IMPORTANT
Figure 19
Figure 22
Figure 18
Figure 21
Vent Sizes
2 in / 4 in
(51 mm/100 mm)
3 in / 5 in
(76 mm/125 mm)
Vent Lengths
75 ft (23 m) 150 ft (46 m)
45° Elbow
3 ft (1 m) 2.5 ft (0.7 m)
90° Elbow
6 ft (2 m) 5 ft (1.5 m)
Table 14. Terminations
Level
Wall
Mounting
Bracket
Wall
Mounting
Bracket
Template
Figure 20
Concentric
vent