Rinnai Tankless Water Heater Installation Instructions: RC98I & Pressure Relief Valve Guide

Rinnai Installation Instructions for Tankless Water Heater and Pressure Relief Valve

Water Piping

Isolation Valves and Pressure Relief Valve

The isolation valves provide the ability to isolate the water heater from the structure’s plumbing and allow quick access to flush the heat exchanger. Check with local codes to determine if a pressure and temperature relief valve is required. The included valves meet American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) and are ANSI/NSF 65 approved for potable water.

Isolation Valve (Cold)	107000082

Isolation Valve (Hot)	107000084

Pressure Relief Valve (PRV)	107000085

Isolation Valves Installation Instructions:

1.Wrap the ends of the threaded water inlet & outlet on the tankless water heater,as well as the threaded end of the approved pressure relief valve with a minimum of 5 wraps of Teflon® tape.

2.Screw the pressure relief valve into the 3/4” threads opposite the wing handle on the HOT water service valve. (RED drain handle) (see Pressure Relief Valve Section for proper installation requirements)

3.Loosen the 3/4” union nut on the HOT water valve and connect to the HOT water outlet on the tankless water heater. If nut is removed, ensure that you realign the tailpiece accurately to the valve and that the black washer is positioned such that the raised metal edge of the valve is inside the washer.

4.Align the direction of the HOT water drain to the desired position.

5.Tighten the union assembly to the HOT water valve using approximately 15 foot lbs of torque.

6.Repeat steps 3-5 for the COLD water valve. (BLUE drain handle) for connection to the COLD water inlet on the tankless water heater.

7.Connect the INLET on the COLD water valve to the MAIN SOURCE of the water supply.

8.Connect the OUTLET on the HOT water valve to the HOT WATER plumbing system.

9.Ensure that both drain valve lever handles are in the closed position (perpendicular to the drain portion of the body).

Pressure Relief Valve Installation Instructions:

The PRV must be connected by the threaded connection opposite the wing handle on the hot water valve (designated by the RED drain handle) or the threaded connection on the side of the relocation fitting above the hot water valve. Installation must maintain a ¾” port size with no shut off valve or line restriction in-between the appliance and the PRV. The discharge line from the PRV should pitch downward and terminate 6” above drains where discharge will be clearly visible. The discharge end of the line shall be plain (unthreaded) and a minimum of ¾” in diameter. The discharge line material must be suitable for water at least 180º Fahrenheit and can be no more than 30 feet in length and contain no more than 4 elbows or bends. No valve of any type may be installed in the discharge line of the pressure relief valve.

Pressure Relief Valve Maintenance:

For proper care of this approved pressure relief valve, it is recommended that the valve is manually operated once a year. In doing so, it will be necessary to

take precautions with regard to the discharge of potentially scalding hot water under pressure. Ensure discharge has a place to flow. Contact with your body or other property may cause damage or harm. Please note that only the PRV in this package is certified by CSA International as an approved item.

20	Manual - Rinnai Condensing Water Heaters

RC80E, RC80I, RC98E, RC98I specifications

The Rinnai RC80E, RC98I, RC98E, and RC80I are high-efficiency tankless water heaters that exemplify leading-edge technology and engineering. Designed to meet the demands of modern households, these units provide continuous hot water while offering energy savings and compact sizes.

Starting with the RC80E, this model features a maximum flow rate of 8 gallons per minute, making it suitable for smaller homes or multi-family settings. It incorporates Rinnai's Circ-Logic technology, allowing homeowners to customize their hot water recirculation. This means users can schedule hot water availability, ensuring comfort while minimizing water waste.

The RC98I and RC98E models elevate performance, boasting a maximum flow rate of 9.8 gallons per minute. The "I" in RC98I stands for internal, indicating its built-in temperature control and Wi-Fi connectivity options. This allows for remote monitoring and control via a smartphone app, enhancing user convenience. In contrast, the "E" in RC98E indicates it has an external setting, providing flexibility for homeowners seeking installation options that cater to their specific needs.

All four models feature Rinnai’s condensing technology, which utilizes a dual heat exchanger design for superior efficiency. This not only lowers energy costs but also reduces CO2 emissions, aligning with eco-friendly standards. Additionally, they operate at an impressive Uniform Energy Factor (UEF), which is crucial for energy-conscious homeowners.

Safety is a significant consideration in Rinnai’s design philosophy. The RC80E, RC98I, RC98E, and RC80I come equipped with multiple safety features, including overheating protection and venting safeguards, ensuring peace of mind during operation. Their compact size allows for versatility in installation, fitting into tight spaces and freeing up valuable room in your home.

Moreover, these water heaters are designed for longevity, featuring a durable construction that resists corrosion. Rinnai's commitment to quality is evident in their extensive warranty, proving their confidence in the product’s reliability.

In summary, the Rinnai RC80E, RC98I, RC98E, and RC80I units represent a blend of advanced technology, efficiency, and convenience. With significant flow rates, innovative features like Circ-Logic and Wi-Fi compatibility, as well as robust safety measures, they are an excellent choice for any homeowner looking to enhance their hot water experience while promoting energy efficiency.