Installation Sheet

Rinnai Tankless Water Heater Installaon and Operaon Manual 17
• Internal water heaters can be installed as direct vent or non-direct vent applicaons.
• When installed as Direct Vent, refer to the “Direct Vent Approved Vent Manufacturers and Products” secon
(within the “1. Direct Vent” secon) for a complete list of approved vent manufacturers and products.
• When installed as Non-Direct Vent (Room Air), the vent must be Category IV and of a type listed by a naonal
recognized tesng agency.
• Exhaust must be directly vented to the outside. Combuson air can be provided from outside (Direct Vent) or
from room air (Non-Direct Vent).
• If using room air (non-direct vent) for combuson, ensure the required volume of indoor air is available
according to the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54.
• Avoid dips or sags in horizontal vent runs by installing supports per the vent manufacturer’s instrucons.
• Support horizontal vent runs every 4  (1.2 m) and all vercal vent runs every 6  (1.83 m) or as per vent
manufacturer’s instrucons or local code requirements.
• Venng should be as direct as possible with a minimum number of pipe ngs.
• For manufactured vent systems, vent connecons must be rmly pressed together so that the connecons form
an air ght seal. Follow the venng manufacturer’s instrucons.
• Refer to the PVC/CPVC manufacturer for appropriate ngs, solvents or joining methods.
• The vent piece connected to the water heater must be secured with 1 self-tapping screw.
• Refer to the instrucons of the vent system manufacturer for component assembly instrucons.
• If the vent system is to be enclosed, it is suggested that the design of the enclosure shall permit inspecon of the
vent system. The design of such enclosure shall be deemed acceptable by the installer or the local inspector.
• Any issues resulng from improper vent installaon will not be covered by warranty.
3.5 Vent the Water Heater
Guidelines
WARNING
DO NOT use cellular core PVC/CPVC.
DO NOT use Radel, ABS, or galvanized material to vent this appliance.
DO NOT cover non-metallic vent pipe and ngs with thermal insulaon.
DO NOT combine vent components from dierent manufacturers.
DO NOT reduce the vent diameter. Vent diameter cannot be less than 2 in. (51 mm).
DO NOT connect the venng system with an exisng vent or chimney.
DO NOT common vent with the vent pipe of any other manufacturer’s water heater or appliance.
Rinnai water heaters can only be common vented with Schedule 40 PVC/CPVC or with a Rinnai cered
common vent system.