A.O. Smith RPV series Installation Instructions And Use & Care Manual

Electric tankless water heater

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Installa on Instruc ons

and Use & Care Guide

Electric Tankless

Water Heater

PLEASE DO NOT RETURN THIS UNIT TO THE

STORE.

Read this manual and the labels on the water heater before you install,

operate, or service it. If you have diﬃ culty following the direc ons, or

aren't sure you can safely and properly do any of this work yourself:

•

Call our Technical Support Hotline:

United States: 1-877-817-6750

Canada:

1-800-265-8520

We can help you with installation, operations, troubleshooting, or

maintenance. Before you call, write down the model and serial number from

the water heater's data plate.

•

Incorrect installa on, opera on, or service can damage the water heater, your

house and other property, and present risks including ﬁ re, scalding, electric

shock, and explosion, causing serious injury or death.

Table of Contents ..............................Page

IMPORTANT SAFETY INFORMATION ............................. 2

GENERAL INFORMATION ............................................... 5

INSTALLATION ............................................................... 11

OPERATION ................................................................... 15

TROUBLESHOOTING .................................................... 17

SERVICE ......................................................................... 22

WIRING DIAGRAMS ..................................................... 29

APPENDIX ...................................................................... 34

Keep this manual near the water heater for future reference whenever maintenance, adjustment or service is required.

Retain your original receipt as proof of purchase.

°F

°C

ENTER

°F

°C

ENTER

100306524_2000558984 (REV. A)

0618

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Summary of Contents for A.O. Smith RPV series

Page 1: Table Of Contents
Installa on Instruc ons and Use & Care Guide Electric Tankless Water Heater PLEASE DO NOT RETURN THIS UNIT TO THE STORE. Read this manual and the labels on the water heater before you install, operate, or service it. If you have diﬃ culty following the direc ons, or aren’t sure you can safely and properly do any of this work yourself: °F °C...
Page 2: Important Safety Information
IMPORTANT SAFETY INFORMATION Read and follow all safety messages and instruc ons in this manual. Important informa on to keep... Fill out this sec on and keep this manual for reference. This is the safety alert symbol. It is used to alert you to poten al physical injury hazards.
Page 3 o reduce the risk of property • Be sure the cover is reinstalled and Temperature Time to Produce a damage, serious injury or death, secured after servicing to reduce Serious Burn read and follow the precau ons below, the risk of fire and electric shock. 120°F (49°C) More than 5 minutes all labels on the water heater, and...
Page 4 precau ons are par cularly important. could cause a fire risk. If the water heater is subjected to flood condi- According to a na onal standard, Ameri- tions or has been submerged in can Society of Sanitary Engineering water, the entire water heater must (ASSE 1070), and most local plumbing be replaced.
Page 5: General Information
GENERAL INFORMATION Introduction Component manually two or three times to purge the trapped air from the top of the Descriptions • This manual provides information heater’s chamber, then close the necessary for the installation, valve. Verify that water has stopped operation, and maintenance of Temperature and Pressure flowing completely before connecting...
Page 6 Component Identification: Two-Chamber Models (R2V, C2V) OUTLET INLET HEATING ELEMENTS NOTICE: The user interface is described in Figure 7, page 16. Intermediate Thermistor * (connects to TH-1) TH-1 TH-2 TH-IN Thermistor* Connections TH-IN Inlet thermistor TH-1 Intermediate thermistor * Often referred to as a TH-2 Outlet thermistor...
Page 7 General Specifications Point-of-Use: Two Chamber: Four Chamber: Models RPV, CPV R2V, C2V R4L, C4L, R4M, C4M Wiring & Circuit Breaker See “Electrical Requirements” on page 8. Requirements Water Connections 3/4” NPT 3/4” NPT 3/4” NPT Weight 8 lbs. (3.6 kg) 13 lbs.
Page 8 Electrical Requirements • Follow these steps to determine the electrical requirements for your water heater: 1.) Find your model number on your water heater’s rating plate. 2.) Locate that model number in one of the tables listed below. For example, if your model is RPVA-24-K5, find *P**-24-K5 in the appropriate table. Models within each table are sorted by Voltage first, then by Wattage per Element (KW).
Page 9 Point-of-Use Models (For potable water heating only. Not for space heating.) NOTICE: Models sorted by Voltage, then by Wattage per Element. Model Recommended Voltage Number Wattage Current per Recommended Element Type Breaker Size per Element Breaker Wire Size Elements (KW) (Amps) (AWG) (Amps)
Page 10 Four-Chamber Models (Single Phase) For potable water heating only. Not for space heating. NOTICE: Models sorted by Voltage, then by Wattage per Element. Model Recommended Voltage Number of Wattage per Current per Recommended Element Breaker Size Elements Element (KW) Breaker Type Wire Size (Amps)
Page 11: Installation
INSTALLATION Getting Started electrical wires that will enter the Code Compliance heater from the side. • Install and properly ground the Bottom Clearance: At a minimum, Clearances unit in accordance with local maintain a bottom clearance of 8 codes, or in the absence of local See Figure 1 or Figure 2.
Page 12 clearances are observed. Do marker. You will then be able to Figure 3. not store any items underneath align the marks later. See also the water heater, and do not Figure 5, page 14. store flammable liquids or other water heater: 5.
Page 13 the heater. The second wrench do so at this point, you will damage and for compliance with all must be used to hold the heater’s your heating element(s). national, state / provincial, and fittings securely because they are local codes. 1.
Page 14 (ampacity) and circuit breaker model. (See “Wiring Diagrams” on Operating instructions are listed ra ng/type are correct for this page 29.) on page 15. water heater. If you marked the board and con- Test Water NOTICE: The electrical nector during earlier steps, align requirements for your model are the marks when plugging the con- Heater Operation...
Page 15: Operation
OPERATION Water Temperature turn the temperature adjustment Two- or four-chamber models knob as described below. This knob only: Adjustment can be found at the top of the circuit The water temperature set point can board next to the plumbing connec- be adjusted within a range of 90°F ons.
Page 16 To toggle between Fahrenheit and Figure 7 . Celsius, Two and Four Chamber Models Only: 1. Press and hold the DOWN button for five seconds. See Figure 7. 2. The °F or °C LED will illuminate, °F °F and the 7-segment LED will display the temperature set point °C in the appropriate units.
Page 17: Troubleshooting
TROUBLESHOOTING Error Codes for Point-of-Use Models If you have a two- or four-chamber model, see page 19. WARNING Electric Shock Risk Contact with the electrical parts inside the water heater can result in severe injury or death from electrical shock: •...
Page 18 Flash Code Description Action / Solution Sequence Moisture detected Shut oﬀ all power to the water heater. Check for water leaks. Correct any leaks found. Dry the control board completely before restoring power. Level Detect Ensure that the heater is ﬁ lled with water and that there is no air trapped inside.
Page 19 Error Codes for Two and Four Chamber Models If you have a point-of-use model, see page 17. WARNING Electric Shock Risk • Contact with the electrical parts inside the water heater can result in severe injury or death from electrical shock: •...
Page 20 Display Description Action / Solution 4-Chamber models only: Turn oﬀ power to the water heater. Outlet thermistor open (TH-4). Check the connec ons of the thermistor in ques on. Disconnect the thermistor, then reconnect it. Turn on power to the water heater. Does the error code reoccur? If yes, turn oﬀ...
Page 21 General Troubleshooting The following chart provides an overview of basic troubleshooting. Symptom Possible Cause Corrective Action Cold water used causes reverse flow Install check valve on outlet. through water heater. Unit “clicks” periodically when no hot Unit has been in standby for an NORMAL OPERATION.
Page 22: Service
SERVICE WARNING! Element Removal and Check your water heater’s data plate for the correct wattage Electric Shock Risk Replacement and voltage. Verify that your Servicing should be new heating element has the performed on this water WARNING! correct wattage rating and is heater only after it has been •...
Page 23 Figure 13. D.) Unscrew and remove the Remove the heater’s front Point-of-use models: retaining nut that secures the cover, then place a bucket Grommet Orienta on heating element (See Figure 14). under the water heater to catch any water that spills. Use an adjustable wrench.
Page 24 C.) Secure the element by installing and B.) Reinstall the top plate and secure Figure 18. tightening the retaining nut (Figure it with the two screws that you Access Plates: 14, page 23). Do not overtighten. removed earlier. (See Figure 12, Two- or Four-Chamber models only page 23.) D.) Secure the red and black wires onto...
Page 25 7.3 Install the new element: Disconnect all branch circuits If there are no water leaks, before servicing unit. complete these steps: A.) Insert the new element into its • Check wires with a non-contact water heater opening. Make A.) Two- or four-chamber water circuit tester to make sure power is sure that the O-ring is positioned heaters only: Take the connector...
Page 26 Figure 22. Figure 24. Thermistor loca ons Thermistor loca ons (Four-chamber models) OUTLET INLET (Point-of-use models) Intermediate OUTLET Intermediate INLET Thermistor * Thermistor * (connects to (connects to TH-2) TH-1) Thermistor* Connections Outlet Thermistor * (Connects to T-Out) T-Aux Auxiliary thermistor Auxiliary Thermistor * (Connects to T-Aux) Inlet thermistor...
Page 27 Draining the Water it must be oriented correctly. We Remove the thermistor by recommend marking the connector turning it counter-clockwise Heater with a 1/2-inch open end and board with a marker. You will then wrench. be able to align the marks. See also WARNING! Figure 5, page 14.
Page 28 Replacement” (page 22). Returning the Water Heater to circuits, 2.) disconnect the plug, 3.) rotate it 180-degrees, then 4.) plug Service G.) Reinstall the inlet and outlet water it back in. lines to the water heater. When you are ready to return H.) Go to step 7.
Page 29: Wiring Diagrams
WIRING DIAGRAMS The wiring diagrams for various models • 1 Chamber, 1 Element, 240/208 • 4 Chamber, 4 Element, 240/208 are listed in this sec on. Locate the VAC (see below). VAC, p. 33. one that corresponds with your model. •...
Page 30 1 Chamber, 1 Dual Element, 240/208 VAC 1 Chamber, 1 Element, 277 VAC Relay 1 Level Level 3-Pin Conn. 3-Pin Conn. Detect Detect Moisture Moisture Relay 2 Sense Sense TH-AUX TH-AUX Relay 1 Relay 1 Control TH-IN TH-IN Element Board Element TH-OUT TH-OUT...
Page 31 2 Chamber, 2 Element, 240/208 VAC Relay 2 Relay 1 Moisture Sense Relay 3 Relay 4 Level Detect TH-1 TH-2 Power Supply TH-IN USE COPPER CONDUCTORS ONLY WHEN Display CONNECTING TO ELECTRICAL SERVICE. Ground NOTICE: 16 kW and 18 kW two-chamber models DO NOT use this conﬁ gura on. 14kW, 208V models DO NOT use this conﬁ...
Page 32 2 Chamber, 2 Element, 240/208 VAC Used ONLY with the following two-chamber models: • 14 kW at 208V • 16 kW • 18 kW Relay 2 Relay 1 Moisture Sense Relay 3 Relay 4 Level Detect TH-1 TH-2 Power Supply TH-IN CIRCUIT BREAKER...
Page 33 4 Chamber, 4 Element, 240/208 VAC Relay 2 Relay 1 Moisture Sense Relay 4 Relay 3 Level Detect Relay 6 Relay 5 TH-1 TH-2 Relay 8 Relay 7 TH-3 TH-4 Power Supply TH-IN CIRCUIT BREAKER CIRCUIT BREAKER USE COPPER CONDUCTORS ONLY WHEN Display Ground CONNECTING TO ELECTRICAL SERVICE.
Page 34: Appendix
APPENDIX: HORIZONTAL MOUNTING OF POU MODELS As stated on page 12, point-of- Figure 27. use (POU) models may be mounted Horizontally-mounted POU water heater: horizontally. Note the following: • If a POU model is to be mounted horizontally, it must be mounted with brackets (provided).
Page 35 Set the water heater on the Figure 30. brackets, base plate down, and secure it with four sets of Internal water heater components are bolts and nuts. See Figure 30 and represented by hidden lines. Figure 31. Surface Water Heater NOTICE: Ensure that the nipples face Components toward the right as shown in Figure...

A.O. Smith RPV series Installation Instructions And Use & Care Manual

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