Installation Guide

Polypropylene (PP) Common Venting Installation Instructions 5
Copyright © 2018 Rinnai America Corporation. All Rights Reserved.
High Altitude Installations
Tankless water heaters using common venng at altudes over 2,000 Ft will automacally derate according to the
tables below. Use the tables below for calculang your total BTU for mulple tankless water heaters.
• High altude installaons are cered up to 10,200 Ft (3,109 m).
• Reference the respecve Rinnai Tankless Water Heater Installaon and Operaon Manual to set the water
heater up for the altude at which they will be operang.
High Altude Derate
PROPANE (LP GAS)
Number
of Water
Heaters
2,001 -
5,200 Ft
5,201 -
7,700 Ft
7,701 -
10,200 Ft
1 168,000 151,000 120,000
2 332,640 298,980 237,600
3 493,920 443,940 352,800
4 651,840 585,880 465,600
5 806,400 724,800 576,000
6 957,600 860,700 684,000
7 1,105,440 993,580 789,600
8 1,249,920 1,123,440 892,800
NATURAL GAS
Number
of Water
Heaters
2,001 -
5,200 Ft
5,201 -
7,700 Ft
7,701 -
10,200 Ft
1 170,000 153,000 139,000
2 336,600 302,940 275,220
3 499,800 449,820 408,660
4 659,600 593,640 539,320
5 816,000 734,400 667,200
6 969,000 872,100 792,300
7 1,118,600 1,006,740 914,620
8 1,264,800 1,138,320 1,034,160
Must Do
• You must use vent components that are cered
and listed with the water heater model.
• The vent system must vent directly to the outside
of the building and use outside air or room air for
combuson.
• Avoid dips or sags in horizontal vent runs by
installing supports per the vent manufacturer’s
instrucons.
• Support horizontal vent runs a minimum of every
four feet and all vercal vent runs a minimum of
every six feet.
• Venng should be as direct as possible with a
minimum number of pipe ngs.
• Vent connecons must be rmly pressed together
so that the gasketed form an air ght seal.
• Vent components connected to the water heater
must be secured with one self-tapping screw, do
not use any glues or solvents to connect vent
components to the water heater.
• Set the temperature seng on all water heaters
being common vented to the same temperature.
• Unless recovering a tank, Rinnai recommends
electronically connecng with common venng
and where water heaters are in a manifold system.
Refer to the Rinnai installaon and operaon
manual for addional details on electronically
connecng mulple water heaters.
• Refer to the appendix of this manual for Ubbink
vent component assembly and installaon
instrucons.
Information