Installation Guide

Polypropylene (PP) Common Venting Installation Instructions 26
Copyright © 2018 Rinnai America Corporation. All Rights Reserved.
Installaon Instrucons
The same procedure may be used
when substung the room air
adapter with the only excepon being
no ex connector or combuson air
header to connect when installing.
• Aer ensuring the water heaters are mounted securely
and spaced 20.5” apart, install the appliance adapter on
top of the water heaters.
• Exhaust Venng is designed for a 3° rise. When the
water heaters are mounted at 20.5” spacing, the height
increase is 1” per water heater. A 3” diameter
extension pipe is included with the kit that must be cut
to length to account for the rise from unit to unit. Aer
cung, always deburr and bevel the end of the vent
piece so the sealing gaskets are not damaged and
operaon of the vent system is not compromised.
• Install the elbows to the 3” diameter extension pipe.
Do not cut or modify the elbow.
• Aer direct vent or room air components are
appropriately posioned, securely fasten the
“Appliance Adapter ” to the top of the water heater
with a self tapping screw.
• For direct vent applicaons, connect the combuson air
opening of the appliance adapter to one end of the ex
connector and the other end of the ex connector to
the Combuson Air Header.
• Connect the open end of the elbow to header.
Elbow
3” Diameter
Extension
Combustion Air Header
Flex Connector
Exhaust Header
Self Tapping
Screw
Appliance
Adapter
Inline
# of Appl
L =
Back-to-Back
# of Appl
L =
1 5.5” 1+1a 5.5”
2 6.5” 2+2a 6.5”
3 7.5” 3+3a 7.5”
4 8.5” 4+4a 8.5”
5 9.5”
6 10.5”
7 11.5”
8 12.5”
Self Tapping
Screw