Rinnai Tankless Water Heater Manual: User Guide and Installation Instructions

The Rinnai Tankless Water Heater is a popular choice for homeowners who want a reliable and efficient hot water system. However, proper installation and usage are crucial to ensure that the unit functions optimally and lasts for many years. That’s why the Rinnai Tankless Water Heater Manual provides a comprehensive guide for users, including installation instructions and guidelines for connecting the condensate drain. The manual emphasizes the importance of following local codes and using only corrosion-resistant materials for the condensate drain lines. It also provides tips on how to prevent condensate damage, such as sloping the drain lines toward the inside floor drain or condensate pump and ensuring that the end of the condensate drain pipe is open to the atmosphere. Additionally, the manual warns against connecting the condensate drain line with an air conditioning evaporator coil drain and installing an external condensate trap. By following these guidelines, users can maximize the performance and lifespan of their Rinnai Tankless Water Heater.

Tankless Water Heater User Guide

Connect Condensate Drain

Guidelines To prevent condensate damage, follow these guidelines:

• Do not plumb the condensate drain with the pressure relief valve; both must be plumbed independently to drain.
• All condensate must drain and be disposed of according to local codes.
• Use only corrosion resistant materials for the condensate drain lines such as PVC pipe or plastic hose.
• The condensate drain pipe (along its entire length) must be at least the same diameter as the drain line (1/2 in. MNPT).
• Condensation drain lines installed in areas that are subject to freezing temperatures should be wrapped with an approved supplemental heat source. Install per manufacturer’s instructions.
• Slope the condensate drain lines toward the inside floor drain or condensate pump.
• The end of the condensate drain pipe should be open to the atmosphere. The end should not be under water or other substances.

Figure 54

• For external (outdoor) installations, to minimize freezing of the condensate, run the condensate drain line through an interior wall or between insulation and an interior wall.
• If a floor drain is not available or the drain is above the level of the condensate drain, a condensate pump should be installed.
• A condensate neutralizer kit is available from Rinnai. The kit allows condensate to flow through neutralizing media that raises the pH of the condensate to a level that will help prevent corrosion of the drain and public sewer system. Refer to section “3.6 Accessories” for more information.
• The condensate drain pipe should be as short as possible and have a downward pitch.
• The condensate trap will automatically prime (self-prime) during operation of the water heater as condensate forms. Condensate draining from the water heater 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.
• DO NOT connect the condensate drain  line with an air conditioning evaporator coil drain.
• Water heaters have an integrated condensate trap. DO NOT install an external condensate trap.

Rinnai Tankless Water Heater Installation and Operation Manual

SPECIFICATIONS

condensate
Corrosion-resistant materials| Must be used for condensate drain lines
Condensate Drain Pipe Diameter| Must be at least 1/2 in. MNPT
Freezing Temperatures| Condensation drain lines must be wrapped with an approved supplemental heat source
Sloping| Condensate drain lines must be sloped toward the inside floor drain or condensate pump
End of Condensate Drain Pipe| Must be open to the atmosphere and not under water or other substances
External Installations| Condensate drain line should be run through an interior wall or between insulation and an interior wall to minimize freezing
Floor Drain| If not available or above the level of the condensate drain, a condensate pump should be installed
Condensate Neutralizer Kit| Available from Rinnai to raise the pH of the condensate and prevent corrosion of the drain and public sewer system
Condensate Trap| Integrated into the water heater and will automatically prime during operation
Air Conditioning Evaporator Coil Drain| Do not connect with the condensate drain line
External Condensate Trap| Do not install

FAQ’S

What is the Rinnai Tankless Water Heater?

The Rinnai Tankless Water Heater is a hot water system that provides reliable and efficient hot water to homeowners.

Why is proper installation important for the Rinnai Tankless Water Heater?

Proper installation is important to ensure that the unit functions optimally and lasts for many years.

What are the guidelines for connecting the condensate drain for the Rinnai Tankless Water Heater?

The guidelines for connecting the condensate drain include using only corrosion-resistant materials, sloping the drain lines toward the inside floor drain or condensate pump, and ensuring that the end of the condensate drain pipe is open to the atmosphere.

What should I do if I live in an area with freezing temperatures?

If you live in an area with freezing temperatures, you should wrap the condensation drain lines with an approved supplemental heat source and install per manufacturer’s instructions.

Can I connect the condensate drain line with an air conditioning evaporator coil drain?

No, you should not connect the condensate drain line with an air conditioning evaporator coil drain.

Should I install an external condensate trap?

No, you should not install an external condensate trap. Water heaters have an integrated condensate trap.

Is it necessary to add water to the condensate trap?

No, it is not necessary to add water to the condensate trap. The trap will automatically prime (self-prime) during operation of the water heater as condensate forms.

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