Rinnai RU199i Water Heater Installation Guide

Rinnai RU199i Water Heater

Product Specifications

• 3/4 Ball Valve
• 3/4 Union Check Valve
• Pressure Relief Valve
• Pressure Regulator
• Circulating Pump
• Boiler Drain Valve
• S Solenoid Valve
• Vacuum Breaker

Product Usage Instructions

Installation Guidelines

• Ensure that the vacuum breaker line is located inside the building for proper functioning.
• Heat trace all water pipes and fittings located outside the home or building structure (attic, crawl space).
• Gas supply components should be located inside the building.
• Install a minimum 1/4 Normally Open Solenoid Valve and a minimum 3/4 Normally Closed Solenoid Valve for proper operation.

Drainage

• Route any excess water to a floor drain or outside to prevent water buildup.

FAQ

• Q: Where should the vacuum breaker line be located?
• A: The vacuum breaker line should be placed inside the building.
• Q: What size of water supply lines are recommended?
• A: A minimum of 3/4 Hot Water Supply Line and a minimum of 3/4 Cold Water Supply Line are recommended.
• Q: What type of solenoid valves should be installed?
• A: Install a minimum 1/4 Normally Open Solenoid Valve and a minimum 3/4 Normally Closed Solenoid Valve for proper functioning.

WARNING
Failure to correctly assemble the components according to these instructions may result in electric shock, injury, or death.
CAUTION
To protect yourself from harm, follow the steps below before proceeding:

• Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at the circuit breaker.
  (The temperature controller does not control the electrical power.)

• Turn off the gas at the manual gas valve, usually located immediately below the water heater.

• Turn off the incoming water supply. This can be done at the isolation valve immediately below the water heater or by turning off the water supply to the building.

Items Inside Product Box

• Before you begin, please make sure all parts are located inside the product box.

Table 1

TOOLS/MATERIALS REQUIRED (FIELD-SUPPLIED)

• 3/4 in. Tee and Nipple
• Phillips Head Screwdriver
• Pliers or Channel Locks
• Teflon Tape or Pipe Sealant

Instructions

IMPORTANT

• When performing the steps in this document, you must follow the wiring guidelines established by the National Electrical Code (NEC).
• When electrical power to the water heater fails, the 3/4 in. solenoid valve closes (stopping the flow of water into the water heater) and the two 1/4 in. solenoid valves open (allowing the water heater and associated piping to drain).

1. Turn off and disconnect 120 V power supply.
2. Turn off the water supply.
3. Turn off the gas supply.
4. Install the 3/4 in. and 1/4 in. solenoid valves (supplied) to the water lines as shown in the diagrams in “Appendix A: Piping Installation Steps.”
5. Install the freeze protection circuit board and make connections according to the instructions in the section “Appendix B: Circuit Board Installation Steps.”

Appendix A: Piping Installation Steps
Appendix A is divided into the following two sections. Refer to the section applicable to your tankless water heater.

• Piping Installation for Models Without Internal Recirculation Pump
• Piping Installation for Models With Internal Recirculation Pump

The key below refers to the diagrams in this section.

KEY

Piping Installation for Models Without Internal Recirculation Pump

Piping Installation for Models Without Internal Recirculation Pump

Piping Installation for Models With Internal Recirculation Pump

Circuit Board Installation Steps

Appendix B: Circuit Board Installation Steps

1. Power of the water heater by unplugging the power cord or turning off the circuit breaker. The controller on the water heater does not control the electrical power.

2. Remove the front panel of the water heater by removing the four screws that secure the panel in place.
   Refer to the Tankless Water Heater Installation and Operation Manual for detailed steps.

3. Locate the PC board in the bottom, right corner of the water heater (Figure 5).

4. Connect the accessory cable (supplied) to the accessory port at the bottom of the PC board (Figure 6).

5. Install the surge protector (supplied) into the upper screw hole of the PC Board (“A” in Figure 7).

6. Insert the Accessory Cable end labeled “Freeze Protection” into the surge protector harness with three white wires (“B” in Figure 7).

7. Secure the grounding wire (“C” in Figure 7) to the ground bar on the tankless water heater.

8. Disconnect the BK/WT power harness from the PC Board and connect it to the Surge Protector Fuse Harness (“D” and “E” in Figure 7).

9. Connect the power connection from the PC Board to the surge protector fuse harness (“E” in Figure 7).

10. Connect the solenoid wires to the terminal screws in the surge protector (“F” in Figure 7).

11. Re-install the water heater front panel.

12. Power on the water heater.

Freeze Protection Instructions for Tankless Water Heaters

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