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I know this depends on the hardness of my local water supply. Is this something that I would be doing pre-emptively, or is it all right to just wait for the warning? Perhaps you could check with your local water supply authority as to the hardness of the water in your area to give you some idea of how often this may be required. Maybe check how quickly the scale builds up in a kitchen electric kettle, just to have some idea of the water quality. Do you want to learn how to adjust the temperature for your Rinnai tankless water heater?
In this guide, I will go over Removing the front panel Pressing the priority button Changing switch 6 in dip switch SW1 Changing switch 5 in dip switch SW1 Let's get started with this guide!
Adjusting Max Temperature On Rinnai Tankless Water Heaters Nothing is more annoying that going through the hassle of installing a tankless water heater only to realize it doesn't get hot enough for your household. Step 1 - Turn Power On In order to adjust the default temperature on a Rinnai unit, the power has to be on.
Step 2 - Remove Front Panel The first step to change the default max temperature on a Rinnai tankless heater is to remove the front panel. Carefully remove the front panel.
Step 3 - Press Priority Button The priority button needs to be green and glowing. If not, press the priority button. Step 4 - Flip Switch 6 in Dip Switch SW1 Take a look at the dip switches inside the Rinnai tankless heater, these are the tiny switches in series connected to a circuit board.
Without A Temperature Controller If your Rinnai tankless heater doesn't have a temperature controller, then there will only be two temperature settings—the default F and the max F. For more warranty details, visit www. Refer to the maintenance section of the operators manual for further details. Delta T determines the flow rate of the tankless water heater.
R 6. Therefore, in areas where the ground water is relatively cold, the RL75 is usually the model of choice for an average residential installation. Whole-House Sizing Chart To make things simpler, a basic sizing chart can be used based on ground water temperature. Please note the below factors as well:. These types of construction fall under the regulation of the model building code enforced in the jurisdiction where the home is to be located. Contact Rinnai if needed for a current list of approved models.
This includes carports and crawlspaces. Outdoor models must be installed outside. Hydronic applications are also defined as commercial installations. Temperature controllers operate on 12 VDC only supplied by the water heater. Improper installation of vent system and components, or failure to follow all installation instructions, can result in property damage or serious injury www. Only vent components that are certified and listed with the water heater model should be used. Therefore, an appliance adaptor is NOT needed.
This manual provides service information for the models below. This table cross references each model to the applicable page number for internal component replacement instructions. KA Condensing. Remove two screws and brackets at the bypass valve. Remove two copper tubes. Remove two screws attaching the water inlet to the bottom of the water heater cabinet.
Remove two screws attaching the water flow servo valve to the bottom of the water heater cabinet. Disconnect the wire harnesses water flow sensor harness - black, yellow, red wires; bypass servo assembly harness - white, red, yellow, orange, brown wires; water flow servo valve harness - multicolored wires depending on model.
For VB models only, remove one screw that is securing ceramic heater. Remove ceramic heater from water flow servo assembly. Pull out the water flow servo assembly and bypass servo assembly.
Remove two screws to separate the bypass servo assembly from the water flow servo assembly. Figure 5 Reinstall water flow servo valve and bypass valve Replace the O-ring included in kit between the water flow servo assembly and the bypass servo assembly.
Attach the water flow servo assembly to the bypass assembly with two screws. Place inside the heater and attach the wire harnesses. For VB models only, reinstall ceramic heater. Attach the water flow assembly to the bottom of the water heater cabinet using two short screws. Then install the two longer screws through the water inlet. Replace the O-ring on the copper lines included in kit. Attach the two copper lines to the bypass valve, with one bracket and one screw for each line.
Reinstall fan assembly Reconnect fan motor harness. Reconnect air inlet thermistor harness. Reinstall the fan duct. Install two screws that attach the fan assembly to the bottom of the combustion chamber. Install controller assembly indoor VB model only Reinstall temperature controller and bracket. Reinstall ignitor module bracket with one screw.
Install ignitor module outdoor VB model only Install bracket and ignitor module with two screws. Close up Open hot water tap and ensure there are no leaks at the water heater. Install front panel using four screws. Reinstall screw covers. Water lines 5. Remove 2 screws and 2 brackets at the water flow servo assembly. Pull out the water lines. Disconnect the wiring harnesses from the water flow sensor, heating element, water flow servo assembly, and bypass servo assembly.
Figure 1 7. Figure 2 Figure 1 Water flow sensor Heating element 8. Remove 2 screws in order to separate the bypass servo assembly from the water flow servo assembly. Figure 3 Water inlet Attach the new water flow servo assembly to the bypass servo assembly with 2 screws. Reconnect the wire harnesses 4. Place inside the water heater. Attach the water flow assembly to the water inlet using 4 screws. Replace the O-ring on the water lines included in kit. Attach the two water lines to the bypass servo assembly with 1 screw each.
Bypass servo Wire harness Remove controller assembly indoor models only 5. Remove water flow servo valve 6. Remove four screws attaching the water inlet to the bottom of the water heater cabinet. Disconnect the wire harnesses water flow sensor harness - black, yellow, red wires; bypass servo assembly harness - white, red, yellow, orange, brown wires, water flow servo valve harness - gray, brown, orange, yellow, white, pink, blue, red. Remove heating element.
Remove two screws in order to separate the bypass servo assembly from the water flow servo assembly. Reinstall water flow servo valve Attach the new water flow servo assembly to the bypass assembly with two screws. Install heating element. Attach the water flow assembly to the water inlet using four screws.
The two shorter screws can be installed first to connect the water flow assembly to the bottom of the cabinet. Attach the two water lines to the bypass valve, with one bracket and one screw for each line. Remove screws and brackets securing the water line connections. Figure 1 8. Remove the 3 screws that attach the gas manifold to the gas valve. Figure 1 9. Remove the 6 screws that attach the gas manifold to the combustion chamber part of the heat exchanger assembly.
Figure 1 Remove the 2 screws attaching the burner to the heat exchanger. Pull out the burner. Disconnect wire harnesses: A. Disconnect overheat bimetal from upper right heat exchanger.
Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements at bottom left , frost sensing switch bottom center. Figure 3 Screws attaching burner Burner cover plate E. Remove the 4 screws connecting the heat exchanger to the casing. Figures 4 and 5 Remove overheat bimetal from upper right heat exchanger. Remove thermistor and o ring from upper left heat exchanger. Remove thermal fuse harness and clips from around heat exchanger.
Install on new heat exchanger and connect to overheat bimetal connector. Remove heating elements and clips from heat exchanger. Remove ignitor module and bracket from bottom of combustion chamber. Remove the fan assembly four screws and install on new heat exchanger.
Install ignitor module and bracket on new heat exchanger. Remove the flue outlet seven screws and install on the new heat exchanger. Install the largest O-ring included in kit over the water outlet tube and the smaller O-ring included in kit over the water inlet tube.
Figure 1 Black gaskets Install the 4 screws at the top and bottom of the heat exchanger to the casing. Make sure that the black gaskets Figure 6 are intact on the gas control assembly.
Attach the gas manifold with 3 machine screws at the gas control assembly. Attach the gas manifold with 6 screws at heat exchanger. Connect wire harnesses: Figure 6 A. Attach the brackets to the water line connections.
On the V53e and R63LSe, install the bracket with the surge protector 3 screws. On VB models, remove one screw from ignitor module bracket. Disconnect wire harness at the fan assembly. On V and VA models, pull out the harness attached to the solenoid on the manifold to make room to pull out the fan assembly.
Remove the 2 screws that attach the fan assembly to the bottom of the burner. Remove the bracket by rotating and moving it up toward the bend in the tube where the diameter is smaller. Disconnect PC Board Figure 4 Remove 1 screw connecting the PC Board to the heat exchanger assembly. Pull out the ignition line and remove the gas manifold.
Remove the 8 screws attaching the burner cover plate to the combustion chamber. Move the cover plate to the side. It is not necessary to disconnect the wire harness from the burner cover plate. Disconnect the wire harnesses: Figure 5 Remove 3 screws behind the fan. Figure 6 Remove 2 screws above the exhaust. Pull assembly from the unit. Figure 7 2 screws burner Ignition line connection A. Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements at bottom , frost sensing switch bottom center.
NOTE: Some models do not have a connector at water outlet or water flow servo heating elements and must be removed from the assembly. Installation Install the largest O-ring included in kit over the water outlet tube and the two smaller O-rings included in kit over the bypass servo tubes.
Relocate water heater components: Important: Take note of wire harness routing prior to removal. Install thermistor and new o ring in kit on new heat exchanger. Remove ignitor module from bottom of combustion chamber. Figures 6, 7 Connect wire harnesses: A. NOTE: Some models do not have a connector at water outlet or water flow servo heating elements and must be reinstalled.
Attach the burner cover plate first with 8 screws and then attach the burner with 2 screws. Make sure that the two black packings Figure 8 are intact on the gas control assembly. Replace the lower and upper packings included in kit for the manifold plate removing any residue. Attach the ignition line at the burner cover plate.
Attach the PC Board to the heat exchanger with 1 screw. Attach the water outlet line and bracket with 1 screw. Depending on model, attach the line to the water flow servo assembly with 1 screw and 1 bracket or attach the lines to the bypass valve with 1 screws and 1 brackets for each line.
Install Fan Assembly Figure 2 Attach the wire harness to the solenoid on the gas manifold brown, black wires. On VB models, install the ignitor module bracket with one screw.
Heat Exchanger Component Replacement Instructions 1. On VB models except the VB, remove one screw from ignitor module bracket. On the VB, remove one screw from the status monitor assembly at the gas manifold. Remove module. Remove Fan Assembly Figure 2 7. Disconnect the air temperature thermistor two white wires at the connection with the white and orange wires within the wire bundle.
On V and VA models and VB, pull out the harness attached to the solenoid on the manifold to make room to pull out the fan assembly. Disconnect the pressure tube from the heat exchanger. Figure 4 8 screws burner cover plate 2 screws burner Pressure tube Ignition line connection Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements at bottom , frost sensing switch top left heat exchanger.
Remove the 9 screws at the cover plate over the air intake passage. Figure 8 Figure 9 Figure 8 Figure 9 9 screws cover plate 4 screws Figure 10 Install the O-ring included in kit over the water outlet tube and the O-ring included in kit over the water flow servo tube or bypass tube. Attach the cover plate over the air intake passage with 9 screws. Figure 7 Use 2 clips on back and 1 clip on side for thermal fuse B. Install with new gasket in kit on new heat exchanger.
Figures 6a, 6b Slide the assembly into the casing assembly and attach with 8 screws starting at the top of the water heater. Connect wire harness attachments. Figure 5 A. NOTE: Some models do not have a connector at water outlet or water flow servo heating elements. Connect the pressure tube.
Make sure that the two black packings Figure 12 are intact on the gas control assembly. Figure 12 Figure 2 Attach the water outlet line and bracket with 1 screw. Figure 2 Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat exchanger and attaching with two screws.
Push the ducting over the fan assembly exit and secure with the metal pinch clamp. Attach the air temperature thermistor white, white wires to the wire harness. For VB models except the VB, install the ignitor module bracket with one screw. Turn off the gas supply, the V power supply, and the water supply. Disconnect wire harness at the fan assembly, the electrical connections to the 3 solenoid valves, and the ignition line.
Remove 3 screws and brackets securing the water line connections. Remove the 9 screws attaching the burner cover plate to the combustion chamber. Install on new heat exchanger by sliding the harness between the water outlet and inlet tubes figure 4 and connect to overheat bimetal connector. Figure 4 F. Remove the flue outlet six screws and install on the new heat exchanger.
Install the largest O-ring included in kit over the water outlet tube and the two smaller O-rings included in kit over the water inlet tubes. Figure 4 Attach brackets at the back and side holding the fusible link. Attach the burner cover plate first with 9 screws and then attach the burner with 2 screws. Replace the electrode gasket. Make sure that the black gasket Figure 7 is intact on the gas control assembly.
Replace the lower and upper gaskets included in kit for the manifold plate removing any residue. Attach the gas manifold with 5 screws at heat exchanger. Overheat bimetal at upper left heat exchanger. Attach the 3 electrical connectors to the solenoid valves. Remove the bracket holding the controller 1 screw. Bracket screw Figure 1 5 screws gas manifold Figure 2 2 machine screws gas valve Water line connections Remove the 3 screws at the seal plate at the top of the water heater.
Remove the seal plate and gasket. Remove flue outlet vent 4 screws. Figure 5 Remove the 4 screws connecting the heat exchanger to the back of the casing. It is hooked on brackets in the casing.
Relocate water heater components: A. Install on new heat exchanger by sliding the harness between the water outlet and inlet tubes figure 7 and connect to overheat bimetal connector. Install the heat exchanger hooking it on the brackets in the back. Install the 4 screws at the top and bottom of the heat exchanger to the back of the casing. Install the flue outlet vent 4 screws and seal plate 3 screws and gasket at the top of the water heater. Make sure that the black gasket Figure 9 is intact on the gas control assembly.
Connect wire harness attachments: A. Connect overheat bimetal at upper right heat exchanger. Figure 8 Electrode Gasket Turn off V power supply.
Remove gas manifold 5. Remove the three machine screws where manifold meets gas valve. Then remove six screws from manifold. Remove eight screws for the combustion chamber sight glass plate. Remove plate.
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