Rinnai Tankless Water Heater Venting Instructions: Comprehensive Guide

Venting Instructions

Intake / Exhaust Guidelines	Refer to the specific instructions on your vent product for
	additional installation requirements.

•This water heater is a direct vent water heater and therefore is certified and listed with the vent system. You must use vent components that are certified and listed with the water heater model.

•Do not combine vent components from different manufacturers.

•The vent system must vent directly to the outside of the building and use outside air for combustion.

•Venting should be as direct as possible with a minimum number of pipe fittings.

•Avoid dips or sags in horizontal vent runs by installing supports per the vent manufacturer’s instructions.

•Support horizontal vent runs every four feet and all vertical vent runs every six feet or in accordance with local codes.

•Vent diameter must not be reduced.

•Do not connect the venting system with an existing vent or chimney.

•Do not common vent with the vent pipe of any other water heater or appliance.

•Vent connections must be firmly pressed together so that the gaskets form an air tight seal.

•Refer to the instructions of the vent system manufacturer for component assembly instructions.

•If the vent system is to be enclosed, it is suggested that the design of the enclosure shall permit inspection of the vent system. The design of such enclosure shall be deemed acceptable by the installer or the local inspector.

Condensate

The Rinnai RC80i and RC98i condensing tankless water heaters are factory equipped with a condensate trap and drain line.

•Use only vent that is approved and identified as acceptable for condensing appliances.

•Do not use aluminum, PVC, CPVC, ABS or galvanized material to vent this appliance.

•Slope the venting toward the appliance according to the vent manufacturers installation instructions.

•All condensate must drain and dispose of per local codes.

•If the condensate drain gets blocked, an error code will display on the controller. If this occurs, the condensate drain must be cleaned.

•The condensate trap will automatically prime (self- prime) during operation of the unit as condensate forms. Condensate draining from the unit indicates that the trap is full and that there is no blockage in the condensate drain. It is not necessary to add water to the condensate trap.

•Use only PVC or CPVC pipe for the condensate drain line.

•The drain pipe (along its entire length) must be at least the same diameter as the drain line, (1/2 inch NPT).

•The drain pipe should be as short as possible and have a downward pitch.

•The end of the drain pipe should be open to the atmosphere. The end should not be under water or other substances.

•Do not connect the drain pipe directly to the rain sewer.

•Do not connect the condensate drain line with an air conditioning evaporator coil drain.

•To minimize freezing of the condensate, run the condensate drain line through an interior wall or between insulation and an interior wall.

Manual - Rinnai Condensing Water Heaters 25