Rinnai Comprehensive Manual for RL94I Water Heater

Water Piping

Isolation Valves and Pressure Relief Valve (RL75i and RL94i)

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 61 approved for potable water.

Isolation Valve (Cold)	107000081
Isolation Valve (Hot)	107000083
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 VB Series Indoor LS Manual