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.

•Every vent connection must be accessible for inspection, cleaning, and replacement.

•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.

•R50LSi, R75LSi, R94LSi: The vent piece connected to the water heater must be secured with one self-tapping screw.

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

Condensate

Condensate formation can occur in high efficiency direct vent appliances. To prevent condensate damage follow these instructions.

•Vertical terminations must incorporate a condensate drain and trap as close as possible to the appliance.

•Slope any horizontal venting 1/4 inch per foot (19 mm / m), towards the heater if the condensate collector is used, or towards the exhaust terminal if the condensate collector is not used.

•Dispose of condensate per local codes.

•The condensate trap must contain a minimum of 3 inches (75 mm) of water.

•Rinnai LSi tankless water heaters have an integrated condensate collector.

•Rinnai offers a condensate trap.

•Regions of cold climate will create more condensate in the vent system. The condensate collector should be used in cold climates.

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VA Series Indoor LS Manual

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Rinnai R98LSI-ASME, R75LSI, R94LSI, R50LSI installation manual Venting Instructions, Intake / Exhaust Guidelines, Condensate
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R50LSI, R94LSI, R75LSI, R98LSI-ASME, R98LSI specifications

The Rinnai R50LSI, R75LSI, R94LSI, R98LSI, and R98LSI-ASME are high-efficiency tankless water heaters designed for residential and commercial applications. Each model in this line-up boasts unique features and technologies that cater to varying hot water needs while emphasizing energy efficiency and reliability.

The R50LSI is the most compact option in the lineup, providing up to 5.1 gallons per minute (GPM) of hot water at a 35°F rise in temperature. It is an ideal choice for smaller households or apartments where space is a premium. It operates using a direct vent system, ensuring safe exhaust of combustion gases outside the home. The R75SLI, with a maximum output of 7.5 GPM, is suited for needs such as multiple showers running simultaneously, making it perfect for medium-sized homes.

Moving on to the R94LSI and R98LSI, these models provide even greater capacity and efficiency. The R94LSI offers an impressive 9.4 GPM flow rate, while the R98LSI reaches a peak of 9.8 GPM, supporting larger family requirements and ensuring hot water availability for multiple applications concurrently. Both models incorporate Rinnai’s advanced Circ-Logic technology, which allows users to set schedules for recirculating hot water, minimizing wait time and enhancing convenience.

For commercial applications, the R98LSI-ASME is a specialized model that includes the American Society of Mechanical Engineers (ASME) certification. This makes it suitable for larger facilities, such as restaurants, schools, and other institutions that demand a robust and efficient solution for comprehensive hot water needs.

All these models feature a user-friendly digital controller, enabling easy temperature adjustments and real-time monitoring. Moreover, their compact design means they can be installed in various locations, saving valuable space. The Rinnai tankless water heaters utilize a highly efficient condensing technology, resulting in a lower carbon footprint and reduced energy costs.

With a robust warranty program and the reliability that Rinnai is known for, the R50LSI, R75LSI, R94LSI, R98LSI, and R98LSI-ASME embody the pinnacle of water heating technology. These models not only provide the convenience of on-demand hot water but also contribute to energy conservation, making them an excellent choice for environmentally conscious consumers.
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